Core functions needed by most db-lib programs. More...

Collaboration diagram for Primary functions:

Functions
static RETCODE	_dbresults (DBPROCESS *dbproc)

const char *	dbacolname (DBPROCESS *dbproc, int computeid, int column)
	Return name of a computed result column.

BYTE *	dbadata (DBPROCESS *dbproc, int computeid, int column)
	Get address of compute column data.

DBINT	dbadlen (DBPROCESS *dbproc, int computeid, int column)
	Get size of data in a compute column.

RETCODE	dbaltbind (DBPROCESS dbproc, int computeid, int column, int vartype, DBINT varlen, BYTE varaddr)
	Bind a compute column to a program variable.

int	dbaltcolid (DBPROCESS *dbproc, int computeid, int column)
	Get column ID of a compute column.

DBINT	dbaltlen (DBPROCESS *dbproc, int computeid, int column)
	Get size of data in compute column.

int	dbaltop (DBPROCESS *dbproc, int computeid, int column)
	Get aggregation operator for a compute column.

int	dbalttype (DBPROCESS *dbproc, int computeid, int column)
	Get datatype for a compute column.

DBINT	dbaltutype (DBPROCESS *dbproc, int computeid, int column)
	Get user-defined datatype of a compute column.

RETCODE	dbanullbind (DBPROCESS dbproc, int computeid, int column, DBINT indicator)
	Tie a null-indicator to a compute result column.

RETCODE	dbanydatecrack (DBPROCESS dbproc, DBDATEREC2 di, int type, const void *data)
	Break any kind of date or time value into useful pieces.

RETCODE	dbbind (DBPROCESS dbproc, int column, int vartype, DBINT varlen, BYTE varaddr)
	Tie a host variable to a resultset column.

BYTE *	dbbylist (DBPROCESS dbproc, int computeid, int size)
	Get `bylist` for a compute row.

RETCODE	dbcancel (DBPROCESS *dbproc)
	Cancel the current command batch.

RETCODE	dbcanquery (DBPROCESS *dbproc)
	Cancel the query currently being retrieved, discarding all pending rows.

char *	dbchange (DBPROCESS *dbproc)
	See if a command caused the current database to change.

void	dbclose (DBPROCESS *dbproc)
	Close a connection to the server and free associated resources.

void	dbclrbuf (DBPROCESS *dbproc, DBINT n)
	Clear n rows from the row buffer.

RETCODE	dbclropt (DBPROCESS *dbproc, int option, const char param[])
	Reset an option.

RETCODE	dbcmd (DBPROCESS *dbproc, const char cmdstring[])
	`Append` SQL to the command buffer.

DBINT	dbcollen (DBPROCESS *dbproc, int column)
	Get size of a regular result column.

char *	dbcolname (DBPROCESS *dbproc, int column)
	Return name of a regular result column.

char *	dbcolsource (DBPROCESS *dbproc, int column)
	Get base database column name for a result set column.

int	dbcoltype (DBPROCESS *dbproc, int column)
	Get the datatype of a regular result set column.

DBTYPEINFO *	dbcoltypeinfo (DBPROCESS *dbproc, int column)
	Get precision and scale information for a regular result column.

int	dbcolutype (DBPROCESS *dbproc, int column)
	Get user-defined datatype of a regular result column.

DBINT	dbconvert (DBPROCESS dbproc, int srctype, const BYTE src, DBINT srclen, int desttype, BYTE *dest, DBINT destlen)
	cf.

DBINT	dbconvert_ps (DBPROCESS dbproc, int db_srctype, const BYTE src, DBINT srclen, int db_desttype, BYTE dest, DBINT destlen, DBTYPEINFO typeinfo)
	Convert one datatype to another.

DBINT	dbcount (DBPROCESS *dbproc)
	Get count of rows processed.

BYTE *	dbdata (DBPROCESS *dbproc, int column)
	Get address of data in a regular result column.

RETCODE	dbdatecrack (DBPROCESS dbproc, DBDATEREC di, DBDATETIME *datetime)
	Break a DBDATETIME value into useful pieces.

DBINT	dbdatlen (DBPROCESS *dbproc, int column)
	Get size of current row's data in a regular result column.

EHANDLEFUNC	dberrhandle (EHANDLEFUNC handler)
	Set an error handler, for messages from db-lib.

void	dbexit ()
	Close server connections and free all related structures.

RETCODE	dbfcmd (DBPROCESS dbproc, const char fmt,...)
	`printf-like` way to form SQL to send to the server.

void	dbfreebuf (DBPROCESS *dbproc)
	Erase the command buffer, in case `DBNOAUTOFREE` was set with dbsetopt().

char *	dbgetchar (DBPROCESS *dbproc, int pos)
	Get address of a position in the command buffer.

int	dbgetmaxprocs (void)
	get maximum simultaneous connections db-lib will open to the server.

int	dbgetpacket (DBPROCESS *dbproc)
	Get TDS packet size for the connection.

RETCODE	dbgetrow (DBPROCESS *dbproc, DBINT row)
	Read a row from the row buffer.

int	dbgettime (void)
	Get maximum seconds db-lib waits for a server response to query.

BYTE *	dbgetuserdata (DBPROCESS *dbproc)
	Get address of user-allocated data from a `DBPROCESS`.

RETCODE	dbinit (void)
	Initialize db-lib.

BOOL	dbiscount (DBPROCESS *dbproc)
	Indicates whether or not the count returned by dbcount is real (Microsoft-compatibility feature).

DBBOOL	dbisopt (DBPROCESS *dbproc, int option, const char param[])
	Get value of an option.

LOGINREC *	dblogin (void)
	Allocate a `LOGINREC` structure.

void	dbloginfree (LOGINREC *login)
	free the `LOGINREC`

RETCODE	dbmorecmds (DBPROCESS *dbproc)
	See if more commands are to be processed.

RETCODE	dbmoretext (DBPROCESS *dbproc, DBINT size, const BYTE text[])
	Send chunk of a text/image value to the server.

MHANDLEFUNC	dbmsghandle (MHANDLEFUNC handler)
	Set a message handler, for messages from the server.

char *	dbname (DBPROCESS *dbproc)
	Get name of current database.

RETCODE	dbnullbind (DBPROCESS dbproc, int column, DBINT indicator)
	Tie a null-indicator to a regular result column.

int	dbnumalts (DBPROCESS *dbproc, int computeid)
	Get count of columns in a compute row.

int	dbnumcols (DBPROCESS *dbproc)
	Return number of regular columns in a result set.

int	dbnumcompute (DBPROCESS *dbproc)
	Get count of `COMPUTE` clauses for a result set.

DBINT	dbprcollen (DBPROCESS *dbproc, int column)
	Get size of a result column needed to print column.

void	dbprhead (DBPROCESS *dbproc)
	Print result set headings to stdout.

RETCODE	dbprrow (DBPROCESS *dbproc)
	Print a result set to stdout.

const char *	dbprtype (int token)
	Print a token value's name to a buffer.

STATUS	dbreadtext (DBPROCESS dbproc, void buf, DBINT bufsize)
	Fetch part of a text or image value from the server.

void	dbrecftos (const char filename[])
	Record to a file all SQL commands sent to the server.

RETCODE	dbresults (DBPROCESS *dbproc)
	Set up query results.

RETCODE	dbsafestr (DBPROCESS dbproc, const char src, DBINT srclen, char *dest, DBINT destlen, int quotetype)
	safely quotes character values in SQL text.

char *	dbservcharset (DBPROCESS *dbproc)
	Get `syscharset` name of the server character set.

void	dbsetifile (char *filename)
	set name and location of the `interfaces` file FreeTDS should use to look up a servername.

void	dbsetinterrupt (DBPROCESS *dbproc, DB_DBCHKINTR_FUNC chkintr, DB_DBHNDLINTR_FUNC hndlintr)
	Set interrupt handler for db-lib to use while blocked against a read from the server.

RETCODE	dbsetlogintime (int seconds)
	Set maximum seconds db-lib waits for a server response to a login attempt.

RETCODE	dbsetlversion (LOGINREC *login, BYTE version)
	Set TDS version for future connections.

RETCODE	dbsetmaxprocs (int maxprocs)
	Set maximum simultaneous connections db-lib will open to the server.

RETCODE	dbsetnull (DBPROCESS dbproc, int bindtype, int bindlen, BYTE bindval)
	Define substitution values to be used when binding null values.

RETCODE	dbsetopt (DBPROCESS dbproc, int option, const char char_param, int int_param)
	Set db-lib or server option.

STATUS	dbsetrow (DBPROCESS *dbproc, DBINT row)
	Make a buffered row "current" without fetching it into bound variables.

RETCODE	dbsettime (int seconds)
	Set maximum seconds db-lib waits for a server response to query.

void	dbsetuserdata (DBPROCESS dbproc, BYTE ptr)
	Associate client-allocated (and defined) data with a `DBPROCESS`.

RETCODE	dbsetversion (DBINT version)
	Specify a db-lib version level.

int	dbspid (DBPROCESS *dbproc)
	Get server process ID for a `DBPROCESS`.

RETCODE	dbspr1row (DBPROCESS dbproc, char buffer, DBINT buf_len)
	Print a regular result row to a buffer.

DBINT	dbspr1rowlen (DBPROCESS *dbproc)
	Determine size buffer required to hold the results returned by dbsprhead(), dbsprline(), and dbspr1row().

RETCODE	dbsprhead (DBPROCESS dbproc, char buffer, DBINT buf_len)
	Print result set headings to a buffer.

RETCODE	dbsprline (DBPROCESS dbproc, char buffer, DBINT buf_len, DBCHAR line_char)
	Get formatted string for underlining dbsprhead() column names.

RETCODE	dbsqlexec (DBPROCESS *dbproc)
	send the SQL command to the server and wait for an answer.

RETCODE	dbsqlok (DBPROCESS *dbproc)
	Wait for results of a query from the server.

RETCODE	dbsqlsend (DBPROCESS *dbproc)
	Transmit the command buffer to the server.

RETCODE	dbstrbuild (DBPROCESS dbproc, char charbuf, int bufsize, char text, char formats,...)
	Build a printable string from text containing placeholders for variables.

RETCODE	dbstrcpy (DBPROCESS dbproc, int start, int numbytes, char dest)
	Get a copy of a chunk of the command buffer.

int	dbstrlen (DBPROCESS *dbproc)
	Get size of the command buffer, in bytes.

RETCODE	dbtablecolinfo (DBPROCESS dbproc, DBINT column, DBCOL pdbcol)
	describe table column attributes with a single call (Freetds-only API function modelled on dbcolinfo)

DBBINARY *	dbtxptr (DBPROCESS *dbproc, int column)
	Get text pointer for a column in the current row.

DBBINARY *	dbtxtimestamp (DBPROCESS *dbproc, int column)
	Get text timestamp for a column in the current row.

RETCODE	dbuse (DBPROCESS dbproc, const char name)
	Change current database.

DBINT	dbvarylen (DBPROCESS *dbproc, int column)
	Determine whether a column can vary in size.

const char *	dbversion ()
	See which version of db-lib is in use.

DBBOOL	dbwillconvert (int srctype, int desttype)
	Test whether or not a datatype can be converted to another datatype.

RETCODE	dbwritetext (DBPROCESS dbproc, char objname, DBBINARY textptr, DBTINYINT textptrlen, DBBINARY timestamp, DBBOOL log, DBINT size, BYTE *text)
	Send text or image data to the server.

Detailed Description

Core functions needed by most db-lib programs.

Function Documentation

◆ _dbresults()

static RETCODE _dbresults ( DBPROCESS * dbproc )

static

Remarks: Either SYBDBLIB or MSDBLIB (not both) must be defined. This affects how certain application-addressable strucures are defined.

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◆ dbacolname()

const char * dbacolname	(	DBPROCESS *	dbproc,
		int	computeid,
		int	column
	)

Return name of a computed result column.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
computeid	identifies which one of potientially many compute rows is meant. The first compute clause has computeid == 1.
column	Nth in the result set, starting with 1.

Returns: pointer to ASCII null-terminated string, the name of the column.

Return values

NULL	column is not in range.

See also: dbcollen(), dbcoltype(), dbdata(), dbdatlen(), dbnumcols().

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◆ dbadata()

BYTE * dbadata	(	DBPROCESS *	dbproc,
		int	computeid,
		int	column
	)

Get address of compute column data.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
computeid	of `COMPUTE` clause to which we're referring.
column	Nth column in computeid, starting from 1.

Returns: pointer to columns's data buffer.

Return values

NULL	no such computeid or column.

See also: dbadlen(), dbaltbind(), dbaltlen(), dbalttype(), dbgetrow(), dbnextrow(), dbnumalts().

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◆ dbadlen()

DBINT dbadlen	(	DBPROCESS *	dbproc,
		int	computeid,
		int	column
	)

Get size of data in a compute column.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
computeid	of `COMPUTE` clause to which we're referring.
column	Nth column in computeid, starting from 1.

Returns: size of the data, in bytes.

Return values

-1	no such column or computeid.
0	data are NULL.

See also: dbadata(), dbaltlen(), dbalttype(), dbgetrow(), dbnextrow(), dbnumalts().

◆ dbaltbind()

RETCODE dbaltbind	(	DBPROCESS *	dbproc,
		int	computeid,
		int	column,
		int	vartype,
		DBINT	varlen,
		BYTE *	varaddr
	)

Bind a compute column to a program variable.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
computeid	of `COMPUTE` clause to which we're referring.
column	Nth column in computeid, starting from 1.
vartype	datatype of the host variable that will receive the data
varlen	size of host variable pointed to varaddr
varaddr	address of host variable

Return values

SUCCEED	everything worked.
FAIL	no such computeid or column, or no such conversion possible, or target buffer too small.

See also: dbadata(), dbaltbind_ps(), dbanullbind(), dbbind(), dbbind_ps(), dbconvert(), dbconvert_ps(), dbnullbind(), dbsetnull(), dbsetversion(), dbwillconvert().

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◆ dbaltcolid()

int dbaltcolid	(	DBPROCESS *	dbproc,
		int	computeid,
		int	column
	)

Get column ID of a compute column.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
computeid	of `COMPUTE` clause to which we're referring.
column	Nth column in computeid, starting from 1.

Returns: Nth column in the base result set, on which column was computed.

See also: dbadata(), dbadlen(), dbaltlen(), dbgetrow(), dbnextrow(), dbnumalts(), dbprtype().

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◆ dbaltlen()

DBINT dbaltlen	(	DBPROCESS *	dbproc,
		int	computeid,
		int	column
	)

Get size of data in compute column.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
computeid	of `COMPUTE` clause to which we're referring.
column	Nth column in computeid, starting from 1.

See also: dbadata(), dbadlen(), dbalttype(), dbgetrow(), dbnextrow(), dbnumalts().

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◆ dbaltop()

int dbaltop	(	DBPROCESS *	dbproc,
		int	computeid,
		int	column
	)

Get aggregation operator for a compute column.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
computeid	of `COMPUTE` clause to which we're referring.
column	Nth column in computeid, starting from 1.

Returns: token value for the type of the compute column's aggregation operator.

Return values

-1	no such computeid or column.

See also: dbadata(), dbadlen(), dbaltlen(), dbnextrow(), dbnumalts(), dbprtype().

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◆ dbalttype()

int dbalttype	(	DBPROCESS *	dbproc,
		int	computeid,
		int	column
	)

Get datatype for a compute column.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
computeid	of `COMPUTE` clause to which we're referring.
column	Nth column in computeid, starting from 1.

Returns: SYB* dataype token.

Return values

-1	no such column or computeid.

See also: dbadata(), dbadlen(), dbaltlen(), dbnextrow(), dbnumalts(), dbprtype().

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◆ dbaltutype()

DBINT dbaltutype	(	DBPROCESS *	dbproc,
		int	computeid,
		int	column
	)

Get user-defined datatype of a compute column.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
computeid	of `COMPUTE` clause to which we're referring.
column	Nth column in computeid, starting from 1.

Returns: user-defined datatype of compute column, else -1.

See also: dbalttype(), dbcolutype().

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◆ dbanullbind()

RETCODE dbanullbind	(	DBPROCESS *	dbproc,
		int	computeid,
		int	column,
		DBINT *	indicator
	)

Tie a null-indicator to a compute result column.

When a row is fetched, the indicator variable tells the state of the column's data.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
computeid	identifies which one of potientially many compute rows is meant. The first compute clause has computeid == 1.
column	Nth column in the result set, starting with 1.
indicator	address of host variable.

Return values

SUCCEED	variable accepted.
FAIL	indicator is NULL or column is out of range.

Remarks

Contents of indicator are set with dbnextrow(). Possible values are:

0 column bound successfully
-1 column is NULL.
>0 true length of data, had column not been truncated due to insufficient space in the columns bound host variable .

See also: dbadata(), dbadlen(), dbaltbind(), dbnextrow(), dbnullbind().

Todo:: Never fails, but only because failure conditions aren't checked.

◆ dbanydatecrack()

RETCODE dbanydatecrack	(	DBPROCESS *	dbproc,
		DBDATEREC2 *	di,
		int	type,
		const void *	data
	)

Break any kind of date or time value into useful pieces.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
di	output: structure to contain the exploded parts of datetime.
type	input: `type` of date/time value returned by dbcoltype().
data	input: `date/time` value to be converted.

Return values

SUCCEED always.

Remarks: The members of di have different names, depending on whether --with-msdblib was configured.

This is an extension to dbdatecrack(), see it for more information.

See also: dbdatecrack(), dbconvert(), dbdata(), dbdatechar(), dbdatename(), dbdatepart(), tdsdbopen().

◆ dbbind()

RETCODE dbbind	(	DBPROCESS *	dbproc,
		int	column,
		int	vartype,
		DBINT	varlen,
		BYTE *	varaddr
	)

Tie a host variable to a resultset column.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
column	Nth column, starting at 1.
vartype	datatype of the host variable that will receive the data
varlen	size of host variable pointed to varaddr
varaddr	address of host variable

Return values

SUCCEED	everything worked.
FAIL	no such column or no such conversion possible, or target buffer too small.

See also

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◆ dbbylist()

BYTE * dbbylist	(	DBPROCESS *	dbproc,
		int	computeid,
		int *	size
	)

Get bylist for a compute row.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
computeid	of `COMPUTE` clause to which we're referring.
size	output: size of `bylist` buffer whose address is returned, possibly zero.

Returns: address of bylist for computeid.

Return values

NULL	no such computeid.

Remarks: Do not free returned pointer.

See also: dbadata(), dbadlen(), dbaltlen(), dbalttype(), dbcolname(), dbgetrow(), dbnextrow().

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◆ dbcancel()

RETCODE dbcancel ( DBPROCESS * dbproc )

Cancel the current command batch.

Parameters

dbproc contains all information needed by db-lib to manage communications with the server.

Return values

SUCCEED always.

See also: dbcanquery(), dbnextrow(), dbresults(), dbsetinterrupt(), dbsqlexec(), dbsqlok(), dbsqlsend().

Todo:: Check for failure and return accordingly.

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◆ dbcanquery()

RETCODE dbcanquery ( DBPROCESS * dbproc )

Cancel the query currently being retrieved, discarding all pending rows.

Parameters

dbproc contains all information needed by db-lib to manage communications with the server.

See also

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◆ dbchange()

char * dbchange ( DBPROCESS * dbproc )

See if a command caused the current database to change.

Parameters

dbproc contains all information needed by db-lib to manage communications with the server.

Returns: name of new database, if changed, as a null-terminated ASCII string, else NULL.

See also: dbname(), dbresults(), dbsqlexec(), dbsqlsend(), dbuse().

◆ dbclose()

void dbclose ( DBPROCESS * dbproc )

Close a connection to the server and free associated resources.

Parameters

dbproc contains all information needed by db-lib to manage communications with the server.

See also: dbexit(), dbopen().

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◆ dbclrbuf()

void dbclrbuf	(	DBPROCESS *	dbproc,
		DBINT	n
	)

Clear n rows from the row buffer.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
n	number of rows to remove, >= 0.

See also: dbgetrow(), dbnextrow(), dbsetopt().

◆ dbclropt()

RETCODE dbclropt	(	DBPROCESS *	dbproc,
		int	option,
		const char	param[]
	)

Reset an option.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
option	to be turned off.
param	clearing some options requires a parameter, believe it or not.

Return values

SUCCEED	option and parameter seem sane.
FAIL	no such option.

Remarks

Only the following options are recognized:

DBARITHABORT
DBARITHIGNORE
DBCHAINXACTS
DBFIPSFLAG
DBISOLATION
DBNOCOUNT
DBNOEXEC
DBPARSEONLY
DBSHOWPLAN
DBSTORPROCID
DBQUOTEDIDENT
DBSETTIME

See also: dbisopt(), dbsetopt().

◆ dbcmd()

RETCODE dbcmd	(	DBPROCESS *	dbproc,
		const char	cmdstring[]
	)

Append SQL to the command buffer.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
cmdstring	SQL to append to the command buffer.

Return values

SUCCEED	success.
FAIL	insufficient memory.

Remarks: set command state to DBCMDPEND unless the command state is DBCMDSENT, in which case it frees the command buffer. This latter may or may not be the Right Thing to do.

See also: dbfcmd(), dbfreebuf(), dbgetchar(), dbopen(), dbstrcpy(), dbstrlen().

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◆ dbcollen()

DBINT dbcollen	(	DBPROCESS *	dbproc,
		int	column
	)

Get size of a regular result column.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
column	Nth in the result set, starting from 1.

Returns: size of the column (not of data in any particular row). On error, -1.

See also: dbcolname(), dbcoltype(), dbdata(), dbdatlen(), dbnumcols().

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◆ dbcolname()

char * dbcolname	(	DBPROCESS *	dbproc,
		int	column
	)

Return name of a regular result column.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
column	Nth in the result set, starting with 1.

Returns: pointer to ASCII null-terminated string, the name of the column.

Return values

NULL	column is not in range.

See also: dbcollen(), dbcoltype(), dbdata(), dbdatlen(), dbnumcols().

Bug:: Relies on ASCII column names, post iconv conversion.
Will not work as described for UTF-8 or UCS-2 clients.
But maybe it shouldn't.

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◆ dbcolsource()

char * dbcolsource	(	DBPROCESS *	dbproc,
		int	column
	)

Get base database column name for a result set column.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
column	Nth in the result set, starting from 1.

Returns: pointer to ASCII null-terminated string, the name of the column. On error, NULL.

See also: dbcolbrowse(), dbqual(), dbtabbrowse(), dbtabcount(), dbtabname(), dbtabsource(), dbtsnewlen(), dbtsnewval(), dbtsput().

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◆ dbcoltype()

int dbcoltype	(	DBPROCESS *	dbproc,
		int	column
	)

Get the datatype of a regular result set column.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
column	Nth in the result set, starting from 1.

Returns: SYB* datetype token value, or zero if column out of range

See also: dbcollen(), dbcolname(), dbdata(), dbdatlen(), dbnumcols(), dbprtype(), dbvarylen().

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◆ dbcoltypeinfo()

DBTYPEINFO * dbcoltypeinfo	(	DBPROCESS *	dbproc,
		int	column
	)

Get precision and scale information for a regular result column.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
column	Nth in the result set, starting from 1.

Returns: Pointer to a DBTYPEINFO structure . NULL column is out of range.

See also: dbcollen(), dbcolname(), dbcoltype(), dbdata(), dbdatlen(), dbnumcols(), dbprtype(), dbvarylen().

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◆ dbcolutype()

int dbcolutype	(	DBPROCESS *	dbproc,
		int	column
	)

Get user-defined datatype of a regular result column.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
column	Nth in the result set, starting from 1.

Returns: SYB* datetype token value, or -1 if column out of range

See also: dbaltutype(), dbcoltype().

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◆ dbconvert()

DBINT dbconvert	(	DBPROCESS *	dbproc,
		int	srctype,
		const BYTE *	src,
		DBINT	srclen,
		int	desttype,
		BYTE *	dest,
		DBINT	destlen
	)

cf.

dbconvert_ps(), above

Sybase: Convert numeric types.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
srctype	datatype of the data to convert.
src	buffer to convert
srclen	length of src
desttype	target datatype
dest	output buffer
destlen	size of dest
typeinfo	address of a `DBTYPEINFO` structure that governs the precision & scale of the output, may be `NULL`.

See also: dbaltbind(), dbaltbind_ps(), dbbind(), dbbind_ps(), dbconvert_ps(), dberrhandle(), dbsetnull(), dbsetversion(), dbwillconvert().

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◆ dbconvert_ps()

DBINT dbconvert_ps	(	DBPROCESS *	dbproc,
		int	db_srctype,
		const BYTE *	src,
		DBINT	srclen,
		int	db_desttype,
		BYTE *	dest,
		DBINT	destlen,
		DBTYPEINFO *	typeinfo
	)

Convert one datatype to another.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
srctype	datatype of the data to convert.
src	buffer to convert
srclen	length of src
desttype	target datatype
dest	output buffer
destlen	size of dest

Returns: On success, the count of output bytes in dest, else -1. On failure, it will call any user-supplied error handler.

Remarks

Causes of failure:

No such conversion unavailable.
Character data output was truncated, or numerical data overflowed or lost precision.
In converting character data to one of the numeric types, the string could not be interpreted as a number.

Conversion functions are handled in the TDS layer.

The main reason for this is that ct-lib and ODBC (and presumably DBI) need to be able to do conversions between datatypes. This is possible because the format of complex data (dates, money, numeric, decimal) is defined by its representation on the wire; thus what we call DBMONEY is exactly its format on the wire. CLIs that need a different representation (ODBC?) need to convert from this format anyway, so the code would already be in place.

Each datatype is also defined by its Server-type so all CLIs should be able to map native types to server types as well.

tds_convert() copies from src to dest and returns the output data length, period. All padding and termination is the responsibility of the API library and is done post-conversion. The peculiar rule in dbconvert() is that a destlen of -1 and a desttype of SYBCHAR means the output buffer should be null-terminated.

See also: dbaltbind(), dbaltbind_ps(), dbbind(), dbbind_ps(), dbconvert_ps(), dberrhandle(), dbsetnull(), dbsetversion(), dbwillconvert().

Todo:

What happens if client does not reset values?

Microsoft and Sybase define this function differently.

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◆ dbcount()

DBINT dbcount ( DBPROCESS * dbproc )

Get count of rows processed.

Parameters

dbproc contains all information needed by db-lib to manage communications with the server.

Returns

for insert/update/delete, count of rows affected.
for select, count of rows returned, after all rows have been fetched.

See also: DBCOUNT(), dbnextrow(), dbresults().

◆ dbdata()

BYTE * dbdata	(	DBPROCESS *	dbproc,
		int	column
	)

Get address of data in a regular result column.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
column	Nth in the result set, starting from 1.

Returns: pointer the data, or NULL if data are NULL, or if column is out of range.

See also: dbbind(), dbcollen(), dbcolname(), dbcoltype(), dbdatlen(), dbnumcols().

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◆ dbdatecrack()

RETCODE dbdatecrack	(	DBPROCESS *	dbproc,
		DBDATEREC *	di,
		DBDATETIME *	datetime
	)

Break a DBDATETIME value into useful pieces.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
di	output: structure to contain the exploded parts of datetime.
datetime	input: `DBDATETIME` to be converted.

Return values

SUCCEED always.

Remarks: The members of di have different names, depending on whether --with-msdblib was configured.

If DBPROCESS is NULL, dbdatecrack() uses the compiled in default value of MSDBLIB as of when libsybdb was compiled, irrespective of its value when the application is compiled. This can lead to incorrect results because Sybase and Microsoft use different ranges – [0,11] vs. [1,12] – for the month.

See also: dbconvert(), dbdata(), dbdatechar(), dbdatename(), dbdatepart(), tdsdbopen().

◆ dbdatlen()

DBINT dbdatlen	(	DBPROCESS *	dbproc,
		int	column
	)

Get size of current row's data in a regular result column.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
column	Nth in the result set, starting from 1.

Returns: size of the data, in bytes.

See also: dbcollen(), dbcolname(), dbcoltype(), dbdata(), dbnumcols().

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◆ dberrhandle()

EHANDLEFUNC dberrhandle ( EHANDLEFUNC handler )

Set an error handler, for messages from db-lib.

Parameters

handler pointer to callback function that will handle errors. Pass NULL to restore the default handler.

Returns: address of prior handler, or NULL if none was previously installed.

See also: DBDEAD(), dbmsghandle().

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◆ dbexit()

void dbexit ( void )

Close server connections and free all related structures.

See also: dbclose(), dbinit(), dbopen().

Todo:: breaks if ctlib/dblib used in same process.

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◆ dbfcmd()

RETCODE dbfcmd	(	DBPROCESS *	dbproc,
		const char *	fmt,
			...
	)

printf-like way to form SQL to send to the server.

Forms a command string and writes to the command buffer with dbcmd().

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
fmt	`man vasprintf` for details.

Return values

SUCCEED	success.
FAIL	insufficient memory, or dbcmd() failed.

See also: dbcmd(), dbfreebuf(), dbgetchar(), dbopen(), dbstrcpy(), dbstrlen().

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◆ dbfreebuf()

void dbfreebuf ( DBPROCESS * dbproc )

Erase the command buffer, in case DBNOAUTOFREE was set with dbsetopt().

Parameters

dbproc contains all information needed by db-lib to manage communications with the server.

See also: dbcmd(), dbfcmd(), dbgetchar(), dbsqlexec(), dbsqlsend(), dbsetopt(), dbstrcpy(), dbstrlen().

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◆ dbgetchar()

char * dbgetchar	(	DBPROCESS *	dbproc,
		int	pos
	)

Get address of a position in the command buffer.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
pos	offset within the command buffer, starting at 0.

Remarks: A bit overspecialized, this one.

See also: dbcmd(), dbfcmd(), dbfreebuf(), dbstrcpy(), dbstrlen(),

◆ dbgetmaxprocs()

int dbgetmaxprocs ( void )

get maximum simultaneous connections db-lib will open to the server.

Returns: Current maximum.

See also: dbsetmaxprocs(), dbopen()

◆ dbgetpacket()

int dbgetpacket ( DBPROCESS * dbproc )

Get TDS packet size for the connection.

Parameters

dbproc contains all information needed by db-lib to manage communications with the server.

Returns: TDS packet size, in bytes.

See also: DBSETLPACKET()

◆ dbgetrow()

RETCODE dbgetrow	(	DBPROCESS *	dbproc,
		DBINT	row
	)

Read a row from the row buffer.

When row buffering is enabled (DBBUFFER option is on), the client can use dbgetrow() to re-read a row previously fetched with dbnextrow(). The effect is to move the row pointer – analogous to fseek() – back to row.
Calls to dbnextrow() read from row + 1 until the buffer is exhausted, at which point it resumes its normal behavior, except that as each row is fetched from the server, it is added to the row buffer (in addition to being returned to the client). When the buffer is filled, dbnextrow() returns FAIL until the buffer is at least partially emptied with dbclrbuf().

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
row	Nth row to read, starting with 1.

Return values

REG_ROW returned row is a regular row.

Returns: computeid when returned row is a compute row.

Return values

NO_MORE_ROWS	no such row in the row buffer. Current row is unchanged.
FAIL	unsuccessful; row buffer may be full.

See also: dbaltbind(), dbbind(), dbclrbuf(), DBCURROW(), DBFIRSTROW(), DBLASTROW(), dbnextrow(), dbsetrow().

◆ dbgettime()

int dbgettime ( void )

Get maximum seconds db-lib waits for a server response to query.

Return values

query timeout limit, in seconds

See also: dberrhandle(), DBSETTIME(), dbsetlogintime(), dbsqlexec(), dbsqlok(), dbsqlsend().

◆ dbgetuserdata()

BYTE * dbgetuserdata ( DBPROCESS * dbproc )

Get address of user-allocated data from a DBPROCESS.

Parameters

dbproc contains all information needed by db-lib to manage communications with the server.

Returns: address of user-defined data that db-lib associated with dbproc when the client called dbsetuserdata().

Return values

undefined (probably NULL) dbsetuserdata() was not previously called.

See also: dbsetuserdata().

◆ dbinit()

RETCODE dbinit ( void )

Initialize db-lib.

Remarks: Call this function before trying to use db-lib in any way.
Allocates various internal structures and reads locales.conf (if any) to determine the default date format.

Return values

SUCCEED	normal.
FAIL	cannot allocate an array of `TDS_MAX_CONN` `TDSSOCKET` pointers.

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◆ dbiscount()

BOOL dbiscount ( DBPROCESS * dbproc )

Indicates whether or not the count returned by dbcount is real (Microsoft-compatibility feature).

Parameters

dbproc contains all information needed by db-lib to manage communications with the server.

Returns: TRUE if the count returned by dbcount is real or FALSE if the count returned by dbcount is not real.

See also: DBCOUNT(), dbcount().

◆ dbisopt()

DBBOOL dbisopt	(	DBPROCESS *	dbproc,
		int	option,
		const char	param[]
	)

Get value of an option.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
option	the option
param	a parameter to option.

See also: dbclropt(), dbsetopt().

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◆ dblogin()

LOGINREC * dblogin ( void )

Allocate a LOGINREC structure.

Remarks: A LOGINREC structure is passed to dbopen() to create a connection to the database. Does not communicate to the server; interacts strictly with library.

Return values

NULL	the `LOGINREC` cannot be allocated.
LOGINREC*	to valid memory, otherwise.

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◆ dbmorecmds()

RETCODE dbmorecmds ( DBPROCESS * dbproc )

See if more commands are to be processed.

Parameters

dbproc contains all information needed by db-lib to manage communications with the server.

See also: DBMORECMDS(). DBCMDROW(), dbresults(), DBROWS(), DBROWTYPE().

◆ dbmoretext()

RETCODE dbmoretext	(	DBPROCESS *	dbproc,
		DBINT	size,
		const BYTE	text[]
	)

Send chunk of a text/image value to the server.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
size	count of bytes to send.
text	textpointer, obtained from dbtxptr.

Return values

SUCCEED always.

See also: dbtxptr(), dbtxtimestamp(), dbwritetext().

Todo:: Check return value of called functions and return FAIL if appropriate.

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◆ dbmsghandle()

MHANDLEFUNC dbmsghandle ( MHANDLEFUNC handler )

Set a message handler, for messages from the server.

Parameters

handler address of the function that will process the messages.

See also: DBDEAD(), dberrhandle().

◆ dbname()

char * dbname ( DBPROCESS * dbproc )

Get name of current database.

Parameters

dbproc contains all information needed by db-lib to manage communications with the server.

Returns: current database name, as null-terminated ASCII string.

See also: dbchange(), dbuse().

◆ dbnullbind()

RETCODE dbnullbind	(	DBPROCESS *	dbproc,
		int	column,
		DBINT *	indicator
	)

Tie a null-indicator to a regular result column.

When a row is fetched, the indicator variable tells the state of the column's data.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
column	Nth column in the result set, starting with 1.
indicator	address of host variable.

Return values

SUCCEED	variable accepted.
FAIL	indicator is NULL or column is out of range.

Remarks

Contents of indicator are set with dbnextrow(). Possible values are:

0 column bound successfully
-1 column is NULL.
>0 true length of data, had column not been truncated due to insufficient space in the columns bound host variable .

See also: dbanullbind(), dbbind(), dbdata(), dbdatlen(), dbnextrow().

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◆ dbnumalts()

int dbnumalts	(	DBPROCESS *	dbproc,
		int	computeid
	)

Get count of columns in a compute row.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
computeid	of `COMPUTE` clause to which we're referring.

Returns: number of columns, else -1 if no such computeid.

See also: dbadata(), dbadlen(), dbaltlen(), dbalttype(), dbgetrow(), dbnextrow(), dbnumcols().

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◆ dbnumcols()

int dbnumcols ( DBPROCESS * dbproc )

Return number of regular columns in a result set.

Parameters

dbproc contains all information needed by db-lib to manage communications with the server.

See also: dbcollen(), dbcolname(), dbnumalts().

◆ dbnumcompute()

int dbnumcompute ( DBPROCESS * dbproc )

Get count of COMPUTE clauses for a result set.

Parameters

dbproc contains all information needed by db-lib to manage communications with the server.

Returns: number of compute clauses for the current query, possibly zero.

See also: dbnumalts(), dbresults().

◆ dbprcollen()

DBINT dbprcollen	(	DBPROCESS *	dbproc,
		int	column
	)

Get size of a result column needed to print column.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
column	Nth in the result set, starting from 1.

Returns: size of the column in characters (not of data in any particular row). On error, -1.

See also: dbcolname(), dbcoltype(), dbdata(), dbdatlen(), dbnumcols().

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◆ dbprhead()

void dbprhead ( DBPROCESS * dbproc )

Print result set headings to stdout.

Parameters

dbproc contains all information needed by db-lib to manage communications with the server.

See also

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◆ dbprrow()

RETCODE dbprrow ( DBPROCESS * dbproc )

Print a result set to stdout.

Parameters

dbproc contains all information needed by db-lib to manage communications with the server.

See also: dbbind(), dbnextrow(), dbprhead(), dbresults(), dbspr1row(), dbsprhead(), dbsprline().

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◆ dbprtype()

const char * dbprtype ( int token )

Print a token value's name to a buffer.

Parameters

token server SYB* value, e.g. SYBINT.

Returns: ASCII null-terminated string.

See also: dbaltop(), dbalttype(), dbcoltype(), dbrettype().

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◆ dbreadtext()

STATUS dbreadtext	(	DBPROCESS *	dbproc,
		void *	buf,
		DBINT	bufsize
	)

Fetch part of a text or image value from the server.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
buf	output: buffer into which text will be placed.
bufsize	size of buf, in bytes.

Returns

>0 count of bytes placed in buf.
0 end of row.
-1 error, no result set ready for dbproc.
NO_MORE_ROWS all rows read, no further data.

See also: dbmoretext(), dbnextrow(), dbwritetext().

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◆ dbrecftos()

void dbrecftos ( const char filename[] )

Record to a file all SQL commands sent to the server.

Parameters

filename name of file to write to.

Remarks: Files are named filename.n, where n is an integer, starting with 0, and incremented with each callto dbopen().

See also: dbopen(), TDSDUMP environment variable().

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◆ dbresults()

RETCODE dbresults ( DBPROCESS * dbproc )

Set up query results.

Parameters

dbproc contains all information needed by db-lib to manage communications with the server.

Return values

SUCCEED	Some results are available.
FAIL	query was not processed successfully by the server
NO_MORE_RESULTS	query produced no results.

Remarks: Call dbresults() after calling dbsqlexec() or dbsqlok(), or dbrpcsend() returns SUCCEED. Unless one of them fails, dbresults will return either SUCCEED or NO_MORE_RESULTS.

The meaning of results is very specific and not very intuitive. Results are created by either

a SELECT statement
- a stored procedure
When dbresults returns SUCCEED, therefore, it indicates the server processed the query successfully and that one or more of these is present:
metadata – dbnumcols() returns 1 or more
data – dbnextrow() returns SUCCEED
return status – dbhasretstat() returns TRUE
output parameters – dbnumrets() returns 1 or more

If none of the above are present, dbresults() returns NO_MORE_RESULTS.

SUCCEED does not imply that DBROWS() will return TRUE or even that dbnumcols() will return nonzero.
A general algorithm for reading results will call dbresults() until it return NO_MORE_RESULTS (or FAIL).
An application should check for all the above kinds of results within the dbresults() loop.

See also: dbsqlexec(), dbsqlok(), dbrpcsend(), dbcancel(), DBROWS(), dbnextrow(), dbnumcols(), dbhasretstat(), dbretstatus(), dbnumrets()

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◆ dbsafestr()

RETCODE dbsafestr	(	DBPROCESS *	dbproc,
		const char *	src,
		DBINT	srclen,
		char *	dest,
		DBINT	destlen,
		int	quotetype
	)

safely quotes character values in SQL text.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
src	input string.
srclen	length of src in bytes, or -1 to indicate it's null-terminated.
dest	output: client-provided output buffer.
destlen	size of dest in bytes, or -1 to indicate it's "big enough" and the data should be null-terminated.
quotetype	`DBSINGLE` Doubles all single quotes ('). `DBDOUBLE` Doubles all double quotes ("). `DBBOTH` Doubles all single and double quotes.

Return values

SUCCEED	everything worked.
FAIL	no such quotetype, or insufficient room in dest.

See also: dbcmd(), dbfcmd().

◆ dbservcharset()

char * dbservcharset ( DBPROCESS * dbproc )

Get syscharset name of the server character set.

Parameters

dbproc contains all information needed by db-lib to manage communications with the server.

Returns: name of server's charset, as null-terminated ASCII string.

See also: dbcharsetconv(), dbgetcharset(), DBSETLCHARSET().

◆ dbsetifile()

void dbsetifile ( char * filename )

set name and location of the interfaces file FreeTDS should use to look up a servername.

Does not affect lookups or location of freetds.conf.

Parameters

filename name of interfaces

See also: dbopen()

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◆ dbsetinterrupt()

void dbsetinterrupt	(	DBPROCESS *	dbproc,
		DB_DBCHKINTR_FUNC	chkintr,
		DB_DBHNDLINTR_FUNC	hndlintr
	)

Set interrupt handler for db-lib to use while blocked against a read from the server.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
chkintr
hndlintr

See also: dbcancel(), dbgetuserdata(), dbsetuserdata(), dbsetbusy(), dbsetidle().

◆ dbsetlogintime()

RETCODE dbsetlogintime ( int seconds )

Set maximum seconds db-lib waits for a server response to a login attempt.

Parameters

seconds New limit for application.

Return values

SUCCEED Always.

See also: dberrhandle(), dbsettime()

◆ dbsetmaxprocs()

RETCODE dbsetmaxprocs ( int maxprocs )

Set maximum simultaneous connections db-lib will open to the server.

Parameters

maxprocs Limit for process.

Return values

SUCCEED Always.

See also: dbgetmaxprocs(), dbopen()

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◆ dbsetnull()

RETCODE dbsetnull	(	DBPROCESS *	dbproc,
		int	bindtype,
		int	bindlen,
		BYTE *	bindval
	)

Define substitution values to be used when binding null values.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
bindtype	type of binding to which the substitute value will apply.
bindlen	size of the substitute value you are supplying, in bytes. Ignored except for CHARBIND and BINARYBIND.
bindval	pointer to a buffer containing the substitute value.

Return values

SUCCEED	query was processed without errors.
FAIL	query was not processed

See also: dbaltbind(), dbbind(), dbconvert(), dbnullbind().

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◆ dbsetopt()

RETCODE dbsetopt	(	DBPROCESS *	dbproc,
		int	option,
		const char *	char_param,
		int	int_param
	)

Set db-lib or server option.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
option	option to set.
char_param	value to set option to, if it wants a null-teminated ASCII string.
int_param	value to set option to, if it wants an integer value.

Return values

SUCCEED	everything worked.
FAIL	no such option, or insufficient memory, or unimplemented.

Remarks: Many are unimplemented.

See also: dbclropt(), dbisopt().

Todo:: Implement more options.

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◆ dbsetrow()

STATUS dbsetrow	(	DBPROCESS *	dbproc,
		DBINT	row
	)

Make a buffered row "current" without fetching it into bound variables.

Parameters

dbproc contains all information needed by db-lib to manage communications with the server.

Return values

MORE_ROWS	row found
NO_MORE_ROWS	row not found
FAIL	dbproc is dead or not enabled

See also: dbaltbind(), dbbind(), dbcanquery(), dbclrbuf(), dbgetrow(), dbnextrow(), dbprrow().

◆ dbsettime()

RETCODE dbsettime ( int seconds )

Set maximum seconds db-lib waits for a server response to query.

Parameters

seconds New limit for application.

Return values

SUCCEED Always.

See also: dberrhandle(), DBGETTIME(), dbsetlogintime(), dbsqlexec(), dbsqlok(), dbsqlsend().

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◆ dbsetuserdata()

void dbsetuserdata	(	DBPROCESS *	dbproc,
		BYTE *	ptr
	)

Associate client-allocated (and defined) data with a DBPROCESS.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
ptr	address of client-defined data.

Remarks: ptr is the location of user data that db-lib will associate with dbproc. The client allocates the buffer addressed by ptr. db-lib never examines or uses the information; it just stashes the pointer for later retrieval by the application with dbgetuserdata().

See also: dbgetuserdata().

◆ dbsetversion()

RETCODE dbsetversion ( DBINT version )

Specify a db-lib version level.

Parameters

version anything, really.

Return values

SUCCEED Always.

Remarks: No effect on behavior of db-lib in FreeTDS.

See also

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◆ dbspid()

int dbspid ( DBPROCESS * dbproc )

Get server process ID for a DBPROCESS.

Parameters

dbproc contains all information needed by db-lib to manage communications with the server.

Returns: "spid", the server's process ID.

See also: dbopen().

◆ dbspr1row()

RETCODE dbspr1row	(	DBPROCESS *	dbproc,
		char *	buffer,
		DBINT	buf_len
	)

Print a regular result row to a buffer.

Fills a buffer with one data row, represented as a null-terminated ASCII string. Helpful for debugging.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
buffer	output: Address of a buffer to hold ASCII null-terminated string.
buf_len	size of buffer, in bytes.

Return values

SUCCEED	on success.
FAIL	trouble encountered.

See also: dbclropt(), dbisopt(), dbprhead(), dbprrow(), dbspr1rowlen(), dbsprhead(), dbsprline().

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◆ dbspr1rowlen()

DBINT dbspr1rowlen ( DBPROCESS * dbproc )

Determine size buffer required to hold the results returned by dbsprhead(), dbsprline(), and dbspr1row().

Parameters

dbproc contains all information needed by db-lib to manage communications with the server.

Returns: size of buffer requirement, in bytes.

Remarks: An esoteric function.

See also: dbprhead(), dbprrow(), dbspr1row(), dbsprhead(), dbsprline().

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◆ dbsprhead()

RETCODE dbsprhead	(	DBPROCESS *	dbproc,
		char *	buffer,
		DBINT	buf_len
	)

Print result set headings to a buffer.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
buffer	output buffer
buf_len	size of buffer

Return values

SUCCEED	buffer filled.
FAIL	insufficient space in buffer, usually.

See also: dbprhead(), dbprrow(), dbsetopt(), dbspr1row(), dbspr1rowlen(), dbsprline().

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◆ dbsprline()

RETCODE dbsprline	(	DBPROCESS *	dbproc,
		char *	buffer,
		DBINT	buf_len,
		DBCHAR	line_char
	)

Get formatted string for underlining dbsprhead() column names.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
buffer	output buffer
buf_len	size of buffer
line_char	character to use to represent underlining.

Return values

SUCCEED	buffer filled.
FAIL	insufficient space in buffer, usually.

See also: dbprhead(), dbprrow(), dbspr1row(), dbspr1rowlen(), dbsprhead().

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◆ dbsqlexec()

RETCODE dbsqlexec ( DBPROCESS * dbproc )

send the SQL command to the server and wait for an answer.

Please be patient. This function waits for the server to respond. dbsqlexec is equivalent to dbsqlsend() followed by dbsqlok().

Parameters

dbproc contains all information needed by db-lib to manage communications with the server.

Return values

SUCCEED	query was processed without errors.
FAIL	was returned by dbsqlsend() or dbsqlok().

See also: dbcmd(), dbfcmd(), dbnextrow(), dbresults(), dbretstatus(), dbsettime(), dbsqlok(), dbsqlsend()

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◆ dbsqlok()

RETCODE dbsqlok ( DBPROCESS * dbproc )

Wait for results of a query from the server.

Parameters

dbproc contains all information needed by db-lib to manage communications with the server.

Return values

SUCCEED	everything worked, fetch results with `dbnextresults()`.
FAIL	SQL syntax error, typically.

See also: dbcmd(), dbfcmd(), DBIORDESC(), DBIOWDESC(), dbmoretext(), dbnextrow(), dbpoll(), DBRBUF(), dbresults(), dbretstatus(), dbrpcsend(), dbsettime(), dbsqlexec(), dbsqlsend(), dbwritetext().

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◆ dbsqlsend()

RETCODE dbsqlsend ( DBPROCESS * dbproc )

Transmit the command buffer to the server.

Non-blocking, does not wait for a response.

Parameters

dbproc contains all information needed by db-lib to manage communications with the server.

Return values

SUCCEED	SQL sent.
FAIL	protocol problem, unless dbsqlsend() when it's not supposed to be (in which case a db-lib error message will be emitted).

See also: dbcmd(), dbfcmd(), DBIORDESC(), DBIOWDESC(), dbnextrow(), dbpoll(), dbresults(), dbsettime(), dbsqlexec(), dbsqlok().

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◆ dbstrbuild()

RETCODE dbstrbuild	(	DBPROCESS *	dbproc,
		char *	charbuf,
		int	bufsize,
		char *	text,
		char *	formats,
			...
	)

Build a printable string from text containing placeholders for variables.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
charbuf	output: buffer that will contain the ASCII null-terminated string built by `dbstrbuild()`.
bufsize	size of charbuf, in bytes.
text	null-terminated ASCII string, with placeholders for variables. A Placeholder is a three-byte string, made up of: '' a percent sign 0-9 an integer (designates the argument number to use, starting with 1.) '!' an exclamation point
formats	null-terminated ASCII sprintf-style string. Has one format specifier for each placeholder in text.

Remarks: Following formats are the arguments, the values to substitute for the placeholders.

See also: dbconvert(), dbdatename(), dbdatepart().

◆ dbstrcpy()

RETCODE dbstrcpy	(	DBPROCESS *	dbproc,
		int	start,
		int	numbytes,
		char *	dest
	)

Get a copy of a chunk of the command buffer.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
start	position in the command buffer to start copying from, starting from 0. If start is past the end of the command buffer, dbstrcpy() inserts a null terminator at dest[0].
numbytes	number of bytes to copy. If -1, dbstrcpy() copies the whole command buffer. If 0 dbstrcpy() writes a `NULL` to dest[0]. If the command buffer contains fewer than numbytes (taking start into account) dbstrcpy() copies the rest of it.
dest	output: the buffer to write to. Make sure it's big enough.

Return values

SUCCEED	the inputs were valid and dest was affected.
FAIL	start < 0 or numbytes < -1.

See also: dbcmd(), dbfcmd(), dbfreebuf(), dbgetchar(), dbstrlen().

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◆ dbstrlen()

int dbstrlen ( DBPROCESS * dbproc )

Get size of the command buffer, in bytes.

Parameters

dbproc contains all information needed by db-lib to manage communications with the server.

See also: dbcmd(), dbfcmd(), dbfreebuf(), dbgetchar(), dbstrcpy().

◆ dbtablecolinfo()

RETCODE dbtablecolinfo	(	DBPROCESS *	dbproc,
		DBINT	column,
		DBCOL *	pdbcol
	)

describe table column attributes with a single call (Freetds-only API function modelled on dbcolinfo)

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
column	Nth in the result set, starting from 1.
pdbcol	address of structure to be populated by this function.

Returns: SUCCEED or FAIL.

See also: dbcolinfo().

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◆ dbtxptr()

DBBINARY * dbtxptr	(	DBPROCESS *	dbproc,
		int	column
	)

Get text pointer for a column in the current row.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
column	number of the column in the `SELECT` statement, starting at 1.

Returns: text pointer for column, may be NULL.

See also: dbtxtimestamp(), dbwritetext().

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◆ dbtxtimestamp()

DBBINARY * dbtxtimestamp	(	DBPROCESS *	dbproc,
		int	column
	)

Get text timestamp for a column in the current row.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
column	number of the column in the `SELECT` statement, starting at 1.

Returns: timestamp for column, may be NULL.

See also: dbtxptr(), dbwritetext().

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◆ dbuse()

RETCODE dbuse	(	DBPROCESS *	dbproc,
		const char *	name
	)

Change current database.

Analagous to the unix command cd, dbuse() makes name the default database. Waits for an answer from the server.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
name	database to use.

Return values

SUCCEED	query was processed without errors.
FAIL	query was not processed

See also: dbchange(), dbname().

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◆ dbvarylen()

DBINT dbvarylen	(	DBPROCESS *	dbproc,
		int	column
	)

Determine whether a column can vary in size.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
column	Nth in the result set, starting from 1.

Return values

TRUE	datatype of column can vary in size, or is nullable.
FALSE	datatype of column is fixed and is not nullable.

See also: dbcollen(), dbcolname(), dbcoltype(), dbdata(), dbdatlen(), dbnumcols(), dbprtype().

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◆ dbversion()

const char * dbversion ( void )

See which version of db-lib is in use.

Returns: null-terminated ASCII string representing the version of db-lib.

Remarks: FreeTDS returns the CVS version string of dblib.c.

See also

◆ dbwillconvert()

DBBOOL dbwillconvert	(	int	srctype,
		int	desttype
	)

Test whether or not a datatype can be converted to another datatype.

Parameters

srctype	type converting from
desttype	type converting to

Remarks: dbwillconvert() lies sometimes. Some datatypes should be convertible but aren't yet in our implementation.
Legal unimplemented conversions return TRUE.

Return values

TRUE	convertible, or should be.
FAIL	not convertible.

See also: dbaltbind(), dbbind(), dbconvert(), dbconvert_ps(), src/dblib/unittests/convert().c().

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◆ dbwritetext()

RETCODE dbwritetext	(	DBPROCESS *	dbproc,
		char *	objname,
		DBBINARY *	textptr,
		DBTINYINT	textptrlen,
		DBBINARY *	timestamp,
		DBBOOL	log,
		DBINT	size,
		BYTE *	text
	)

Send text or image data to the server.

Parameters

dbproc	contains all information needed by db-lib to manage communications with the server.
objname	table name
textptr	text pointer to be modified, obtained from dbtxptr().
textptrlen	Ignored. Supposed to be `DBTXPLEN`.
timestamp	text timestamp to be modified, obtained from dbtxtimestamp() or dbtxtsnewval(), may be `NULL`.
log	`TRUE` if the operation is to be recorded in the transaction log.
size	overall size of the data (in total, not just for this call), in bytes. A guideline, must not overstate the case.
text	the chunk of data to write.

Return values

SUCCEED	everything worked.
FAIL	not sent, possibly because timestamp is invalid or was changed in the database since it was fetched.

See also: dbmoretext(), dbtxptr(), dbtxtimestamp(), dbwritetext(), dbtxtsput().

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Functions

Detailed Description

Function Documentation

◆ _dbresults()

◆ dbacolname()

◆ dbadata()

◆ dbadlen()

◆ dbaltbind()

◆ dbaltcolid()

◆ dbaltlen()

◆ dbaltop()

◆ dbalttype()

◆ dbaltutype()

◆ dbanullbind()

◆ dbanydatecrack()

◆ dbbind()

◆ dbbylist()

◆ dbcancel()

◆ dbcanquery()

◆ dbchange()

◆ dbclose()

◆ dbclrbuf()

◆ dbclropt()

◆ dbcmd()

◆ dbcollen()

◆ dbcolname()

◆ dbcolsource()

◆ dbcoltype()

◆ dbcoltypeinfo()

◆ dbcolutype()

◆ dbconvert()

◆ dbconvert_ps()

◆ dbcount()

◆ dbdata()

◆ dbdatecrack()

◆ dbdatlen()

◆ dberrhandle()

◆ dbexit()

◆ dbfcmd()

◆ dbfreebuf()

◆ dbgetchar()

◆ dbgetmaxprocs()

◆ dbgetpacket()

◆ dbgetrow()

◆ dbgettime()

◆ dbgetuserdata()

◆ dbinit()

◆ dbiscount()

◆ dbisopt()

◆ dblogin()

◆ dbmorecmds()

◆ dbmoretext()

◆ dbmsghandle()

◆ dbname()

◆ dbnullbind()

◆ dbnumalts()

◆ dbnumcols()

◆ dbnumcompute()

◆ dbprcollen()

◆ dbprhead()

◆ dbprrow()

◆ dbprtype()

◆ dbreadtext()

◆ dbrecftos()

◆ dbresults()

◆ dbsafestr()

◆ dbservcharset()

◆ dbsetifile()

◆ dbsetinterrupt()

◆ dbsetlogintime()

◆ dbsetmaxprocs()

◆ dbsetnull()

◆ dbsetopt()

◆ dbsetrow()

◆ dbsettime()

◆ dbsetuserdata()

◆ dbsetversion()

◆ dbspid()

◆ dbspr1row()

◆ dbspr1rowlen()