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Query
[LibTDS API]

Function to handle query. More...

Defines

#define START_QUERY   do { ; } while(0)
#define tds_convert_string_free(original, converted)   do { if (original != converted) free((char*) converted); } while(0)
#define TDS_PUT_N_AS_UCS2(tds, s)

Enumerations

enum  { MUL_STARTED = 1 }

Functions

static char * tds5_fix_dot_query (const char *query, int *query_len, TDSPARAMINFO *params)
static char * tds7_build_param_def_from_params (TDSSOCKET *tds, const char *query, size_t query_len, TDSPARAMINFO *params, size_t *out_len)
 Return string with parameters definition, useful for TDS7+.
static char * tds7_build_param_def_from_query (TDSSOCKET *tds, const char *converted_query, int converted_query_len, TDSPARAMINFO *params, size_t *out_len)
 Return string with parameters definition, useful for TDS7+.
static void tds7_put_cursor_fetch (TDSSOCKET *tds, TDS_INT cursor_id, TDS_TINYINT fetch_type, TDS_INT i_row, TDS_INT num_rows)
static void tds7_put_params_definition (TDSSOCKET *tds, const char *param_definition, size_t param_length)
static void tds7_put_query_params (TDSSOCKET *tds, const char *query, int query_len)
 Output params types and query (required by sp_prepare/sp_executesql/sp_prepexec).
static void tds7_send_execute (TDSSOCKET *tds, TDSDYNAMIC *dyn)
static int tds_ascii_to_ucs2 (char *buffer, const char *buf)
 Accept an ASCII string, convert it to UCS2-LE The input is null-terminated, but the output excludes the null.
static const char * tds_convert_string (TDSSOCKET *tds, const TDSICONV *char_conv, const char *s, int len, int *out_len)
 Convert a string in an allocated buffer.
int tds_count_placeholders (const char *query)
 Count the number of placeholders in query.
static int tds_count_placeholders_ucs2le (const char *query, const char *query_end)
int tds_cursor_close (TDSSOCKET *tds, TDSCURSOR *cursor)
int tds_cursor_dealloc (TDSSOCKET *tds, TDSCURSOR *cursor)
 Send a deallocation request to server libTDS care for all deallocation stuff (memory and server cursor) Caller should not use cursor pointer anymore.
int tds_cursor_declare (TDSSOCKET *tds, TDSCURSOR *cursor, TDSPARAMINFO *params, int *something_to_send)
int tds_cursor_fetch (TDSSOCKET *tds, TDSCURSOR *cursor, TDS_CURSOR_FETCH fetch_type, TDS_INT i_row)
int tds_cursor_open (TDSSOCKET *tds, TDSCURSOR *cursor, TDSPARAMINFO *params, int *something_to_send)
int tds_cursor_setname (TDSSOCKET *tds, TDSCURSOR *cursor)
int tds_cursor_setrows (TDSSOCKET *tds, TDSCURSOR *cursor, int *something_to_send)
int tds_cursor_update (TDSSOCKET *tds, TDSCURSOR *cursor, TDS_CURSOR_OPERATION op, TDS_INT i_row, TDSPARAMINFO *params)
static int tds_get_column_declaration (TDSSOCKET *tds, TDSCOLUMN *curcol, char *out)
 Return declaration for column (like "varchar(20)").
int tds_get_dynid (TDSSOCKET *tds, char **id)
 Get an id for dynamic query based on TDS information.
int tds_multiple_done (TDSSOCKET *tds, TDSMULTIPLE *multiple)
int tds_multiple_execute (TDSSOCKET *tds, TDSMULTIPLE *multiple, TDSDYNAMIC *dyn)
int tds_multiple_init (TDSSOCKET *tds, TDSMULTIPLE *multiple, TDS_MULTIPLE_TYPE type)
int tds_multiple_query (TDSSOCKET *tds, TDSMULTIPLE *multiple, const char *query, TDSPARAMINFO *params)
const char * tds_next_placeholder (const char *start)
 Get position of next placeholder.
static const char * tds_next_placeholder_ucs2le (const char *start, const char *end, int named)
static int tds_put_data (TDSSOCKET *tds, TDSCOLUMN *curcol)
 Write data to wire.
static int tds_put_data_info (TDSSOCKET *tds, TDSCOLUMN *curcol, int flags)
 Put data information to wire.
static int tds_put_data_info_length (TDSSOCKET *tds, TDSCOLUMN *curcol, int flags)
 Calc information length in bytes (useful for calculating full packet length).
static int tds_put_param_as_string (TDSSOCKET *tds, TDSPARAMINFO *params, int n)
static void tds_put_params (TDSSOCKET *tds, TDSPARAMINFO *info, int flags)
static int tds_query_flush_packet (TDSSOCKET *tds)
static int tds_quote (TDSSOCKET *tds, char *buffer, char quoting, const char *id, int len)
static void tds_quote_and_put (TDSSOCKET *tds, const char *s, const char *end)
int tds_quote_id (TDSSOCKET *tds, char *buffer, const char *id, int idlen)
 Quote an id.
int tds_quote_string (TDSSOCKET *tds, char *buffer, const char *str, int len)
 Quote a string.
int tds_send_cancel (TDSSOCKET *tds)
 tds_send_cancel() sends an empty packet (8 byte header only) tds_process_cancel should be called directly after this.
static int tds_send_emulated_execute (TDSSOCKET *tds, const char *query, TDSPARAMINFO *params)
 Emulate prepared execute traslating to a normal language.
static void tds_set_cur_cursor (TDSSOCKET *tds, TDSCURSOR *cursor)
static const char * tds_skip_comment (const char *s)
static const char * tds_skip_comment_ucs2le (const char *s, const char *end)
const char * tds_skip_quoted (const char *s)
 Skip quoting string (like 'sfsf', "dflkdj" or [dfkjd]).
static const char * tds_skip_quoted_ucs2le (const char *s, const char *end)
int tds_submit_execdirect (TDSSOCKET *tds, const char *query, TDSPARAMINFO *params)
 Submit a prepared query with parameters.
int tds_submit_execute (TDSSOCKET *tds, TDSDYNAMIC *dyn)
 tds_submit_execute() sends a previously prepared dynamic statement to the server.
int tds_submit_optioncmd (TDSSOCKET *tds, TDS_OPTION_CMD command, TDS_OPTION option, TDS_OPTION_ARG *param, TDS_INT param_size)
int tds_submit_prepare (TDSSOCKET *tds, const char *query, const char *id, TDSDYNAMIC **dyn_out, TDSPARAMINFO *params)
 tds_submit_prepare() creates a temporary stored procedure in the server.
int tds_submit_query (TDSSOCKET *tds, const char *query)
 tds_submit_query() sends a language string to the database server for processing.
int tds_submit_query_params (TDSSOCKET *tds, const char *query, TDSPARAMINFO *params)
 tds_submit_query_params() sends a language string to the database server for processing.
int tds_submit_queryf (TDSSOCKET *tds, const char *queryf,...)
int tds_submit_rpc (TDSSOCKET *tds, const char *rpc_name, TDSPARAMINFO *params)
 tds_submit_rpc() call a RPC from server.
int tds_submit_unprepare (TDSSOCKET *tds, TDSDYNAMIC *dyn)
 Send a unprepare request for a prepared query.

Variables

static volatile int inc_num = 1

Detailed Description

Function to handle query.


Define Documentation

#define TDS_PUT_N_AS_UCS2 tds,
 ) 
 

Value:

do { \
        char buffer[sizeof(s)*2-2]; \
        tds_put_n(tds, buffer, tds_ascii_to_ucs2(buffer, s)); \
} while(0)


Function Documentation

static char * tds7_build_param_def_from_params TDSSOCKET tds,
const char *  query,
size_t  query_len,
TDSPARAMINFO params,
size_t *  out_len
[static]
 

Return string with parameters definition, useful for TDS7+.

Parameters:
tds state information for the socket and the TDS protocol
params parameters to build declaration
out_len length output buffer in bytes
Returns:
allocated and filled string or NULL on failure (coded in ucs2le charset )

static char * tds7_build_param_def_from_query TDSSOCKET tds,
const char *  converted_query,
int  converted_query_len,
TDSPARAMINFO params,
size_t *  out_len
[static]
 

Return string with parameters definition, useful for TDS7+.

Parameters:
tds state information for the socket and the TDS protocol
params parameters to build declaration
out_len length output buffer in bytes
Returns:
allocated and filled string or NULL on failure (coded in ucs2le charset )

static void tds7_put_query_params TDSSOCKET tds,
const char *  query,
int  query_len
[static]
 

Output params types and query (required by sp_prepare/sp_executesql/sp_prepexec).

Parameters:
tds state information for the socket and the TDS protocol
query query (in ucs2le codings)
query_len query length in bytes

static int tds_ascii_to_ucs2 char *  buffer,
const char *  buf
[static]
 

Accept an ASCII string, convert it to UCS2-LE The input is null-terminated, but the output excludes the null.

Parameters:
buffer buffer where to store output
buf string to write
Returns:
bytes written

static const char* tds_convert_string TDSSOCKET tds,
const TDSICONV *  char_conv,
const char *  s,
int  len,
int *  out_len
[static]
 

Convert a string in an allocated buffer.

Parameters:
tds state information for the socket and the TDS protocol
char_conv information about the encodings involved
s input string
len input string length (in bytes), -1 for null terminated
out_len returned output length (in bytes)
Returns:
string allocated (or input pointer if no conversion required) or NULL if error

static int tds_get_column_declaration TDSSOCKET tds,
TDSCOLUMN curcol,
char *  out
[static]
 

Return declaration for column (like "varchar(20)").

Parameters:
tds state information for the socket and the TDS protocol
curcol column
out buffer to hold declaration
Returns:
TDS_FAIL or TDS_SUCCEED

int tds_get_dynid TDSSOCKET tds,
char **  id
 

Get an id for dynamic query based on TDS information.

Parameters:
tds state information for the socket and the TDS protocol
Returns:
TDS_FAIL or TDS_SUCCEED

const char* tds_next_placeholder const char *  start  ) 
 

Get position of next placeholder.

Parameters:
start pointer to part of query to search
Returns:
next placeholder or NULL if not found

static int tds_put_data TDSSOCKET tds,
TDSCOLUMN curcol
[static]
 

Write data to wire.

Parameters:
tds state information for the socket and the TDS protocol
curcol column where store column information
Returns:
TDS_FAIL on error or TDS_SUCCEED

static int tds_put_data_info TDSSOCKET tds,
TDSCOLUMN curcol,
int  flags
[static]
 

Put data information to wire.

Parameters:
tds state information for the socket and the TDS protocol
curcol column where to store information
flags bit flags on how to send data (use TDS_PUT_DATA_USE_NAME for use name information)
Returns:
TDS_SUCCEED or TDS_FAIL

static int tds_put_data_info_length TDSSOCKET tds,
TDSCOLUMN curcol,
int  flags
[static]
 

Calc information length in bytes (useful for calculating full packet length).

Parameters:
tds state information for the socket and the TDS protocol
curcol column where to store information
flags bit flags on how to send data (use TDS_PUT_DATA_USE_NAME for use name information)
Returns:
TDS_SUCCEED or TDS_FAIL

int tds_quote_id TDSSOCKET tds,
char *  buffer,
const char *  id,
int  idlen
 

Quote an id.

Parameters:
tds state information for the socket and the TDS protocol
buffer buffer to store quoted id. If NULL do not write anything (useful to compute quote length)
id id to quote
idlen id length
Returns:
written chars (not including needed terminator)

int tds_quote_string TDSSOCKET tds,
char *  buffer,
const char *  str,
int  len
 

Quote a string.

Parameters:
tds state information for the socket and the TDS protocol
buffer buffer to store quoted id. If NULL do not write anything (useful to compute quote length)
str string to quote (not necessary null-terminated)
len length of string (-1 for null terminated)
Returns:
written chars (not including needed terminator)

int tds_send_cancel TDSSOCKET tds  ) 
 

tds_send_cancel() sends an empty packet (8 byte header only) tds_process_cancel should be called directly after this.

Parameters:
tds state information for the socket and the TDS protocol
Remarks:
tcp will either deliver the packet or time out. (TIME_WAIT determines how long it waits between retries.)
On sending the cancel, we may get EAGAIN. We then select(2) until we know either 1) it succeeded or 2) it didn't. On failure, close the socket, tell the app, and fail the function.

On success, we read(2) and wait for a reply with select(2). If we get one, great. If the client's timeout expires, we tell him, but all we can do is wait some more or give up and close the connection. If he tells us to cancel again, we wait some more.

const char* tds_skip_quoted const char *  s  ) 
 

Skip quoting string (like 'sfsf', "dflkdj" or [dfkjd]).

Parameters:
s pointer to first quoting character (should be '," or [)
Returns:
character after quoting

int tds_submit_execdirect TDSSOCKET tds,
const char *  query,
TDSPARAMINFO params
 

Submit a prepared query with parameters.

Parameters:
tds state information for the socket and the TDS protocol
query language query with given placeholders (?)
params parameters to send
Returns:
TDS_FAIL or TDS_SUCCEED

int tds_submit_execute TDSSOCKET tds,
TDSDYNAMIC dyn
 

tds_submit_execute() sends a previously prepared dynamic statement to the server.

Parameters:
tds state information for the socket and the TDS protocol
dyn dynamic proc to execute. Must build from same tds.

int tds_submit_prepare TDSSOCKET tds,
const char *  query,
const char *  id,
TDSDYNAMIC **  dyn_out,
TDSPARAMINFO params
 

tds_submit_prepare() creates a temporary stored procedure in the server.

Under TDS 4.2 dynamic statements are emulated building sql command

Parameters:
tds state information for the socket and the TDS protocol
query language query with given placeholders (?)
id string to identify the dynamic query. Pass NULL for automatic generation.
dyn_out will receive allocated TDSDYNAMIC*. Any older allocated dynamic won't be freed, Can be NULL.
params parameters to use. It can be NULL even if parameters are present. Used only for TDS7+
Returns:
TDS_FAIL or TDS_SUCCEED

int tds_submit_query TDSSOCKET tds,
const char *  query
 

tds_submit_query() sends a language string to the database server for processing.

TDS 4.2 is a plain text message with a packet type of 0x01, TDS 7.0 is a unicode string with packet type 0x01, and TDS 5.0 uses a TDS_LANGUAGE_TOKEN to encapsulate the query and a packet type of 0x0f.

Parameters:
tds state information for the socket and the TDS protocol
query language query to submit
Returns:
TDS_FAIL or TDS_SUCCEED

int tds_submit_query_params TDSSOCKET tds,
const char *  query,
TDSPARAMINFO params
 

tds_submit_query_params() sends a language string to the database server for processing.

TDS 4.2 is a plain text message with a packet type of 0x01, TDS 7.0 is a unicode string with packet type 0x01, and TDS 5.0 uses a TDS_LANGUAGE_TOKEN to encapsulate the query and a packet type of 0x0f.

Parameters:
tds state information for the socket and the TDS protocol
query language query to submit
params parameters of query
Returns:
TDS_FAIL or TDS_SUCCEED

int tds_submit_rpc TDSSOCKET tds,
const char *  rpc_name,
TDSPARAMINFO params
 

tds_submit_rpc() call a RPC from server.

Output parameters will be stored in tds->param_info

Parameters:
tds state information for the socket and the TDS protocol
rpc_name name of RPC
params parameters informations. NULL for no parameters

int tds_submit_unprepare TDSSOCKET tds,
TDSDYNAMIC dyn
 

Send a unprepare request for a prepared query.

Parameters:
tds state information for the socket and the TDS protocol
dyn dynamic query
Returns:
TDS_SUCCEED or TDS_FAIL


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