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FreeTDS API
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Metadata about columns in regular and compute rows. More...
#include <tds.h>
Public Attributes | ||
| BCPCOLDATA * | bcp_column_data | |
| TDS_INT | bcp_prefix_len | |
| The length, in bytes, of any length prefix this column may have. | ||
| TDS_INT | bcp_term_len | |
| TDS_CHAR * | bcp_terminator | |
| TDSICONV * | char_conv | |
| refers to previously allocated iconv information | ||
| TDS_SMALLINT | column_bindfmt | |
| TDS_INT | column_bindlen | |
| TDS_SMALLINT | column_bindtype | |
| TDS_UCHAR | column_collation [5] | |
| uint8_t | column_computed:1 | |
| TDS_INT | column_cur_size | |
| size written in variable (ie: char, text, binary). | ||
| unsigned char * | column_data | |
| void(* | column_data_free )(struct tds_column *column) | |
| TDS_INT | column_flags | |
| uint8_t | column_hidden:1 | |
| char | column_iconv_buf [9] | |
| unsigned char | column_iconv_left | |
| uint8_t | column_identity:1 | |
| uint8_t | column_key:1 | |
| TDS_INT * | column_lenbind | |
| DSTR | column_name | |
| uint8_t | column_nullable:1 | |
| TDS_SMALLINT * | column_nullbind | |
| TDS_SMALLINT | column_operand | |
| TDS_TINYINT | column_operator | |
| uint8_t | column_output:1 | |
| TDS_TINYINT | column_prec | |
| precision for decimal/numeric and some datetime types | ||
| TDS_TINYINT | column_scale | |
| scale for decimal/numeric | ||
| TDS_INT | column_size | |
| Maximun size of data. | ||
| TDS_INT | column_text_sqlgetdatapos | |
| TDS_CHAR | column_text_sqlputdatainfo | |
| TDS_INT | column_textpos | |
| uint8_t | column_timestamp:1 | |
| TDS_SERVER_TYPE | column_type | |
| This type can be different from wire type because conversion (e.g. | ||
| TDS_INT | column_usertype | |
| TDS_CHAR * | column_varaddr | |
| TDS_TINYINT | column_varint_size | |
| Size of length when reading from wire (0, 1, 2, 4, 5 or 8). | ||
| uint8_t | column_writeable:1 | |
| const TDSCOLUMNFUNCS * | funcs | |
| struct { | ||
| TDS_INT column_size | ||
| TDS_SERVER_TYPE column_type | ||
| type of data, saved from wire | ||
| } | on_server | |
| DSTR | table_column_name | |
| DSTR | table_name | |
| uint8_t | use_iconv_out:1 | |
Metadata about columns in regular and compute rows.
| TDS_INT tds_column::bcp_prefix_len |
The length, in bytes, of any length prefix this column may have.
For example, strings in some non-C programming languages are made up of a one-byte length prefix, followed by the string data itself. If the data do not have a length prefix, set prefixlen to 0. Currently not very used in code, however do not remove.
| TDS_INT tds_column::column_cur_size |
size written in variable (ie: char, text, binary).
-1 if NULL.
| TDS_INT tds_column::column_size |
Maximun size of data.
For fixed types is the size.
| TDS_SERVER_TYPE tds_column::column_type |
This type can be different from wire type because conversion (e.g.
type of data, saved from wire
UCS-2->Ascii) can be applied. I'm beginning to wonder about the wisdom of this, however. April 2003 jkl
| TDS_TINYINT tds_column::column_varint_size |
Size of length when reading from wire (0, 1, 2, 4, 5 or 8).
0 means fixed type. 1, 2 and 4 means the data stream contains a length exactly these bytes. 5 means old BLOB types having TEXTPTR on them. 5 as they contain 2 lengths, one 4 bytes for data length and another 1 byte for TEXTPTR length. 8 are MSSQL VARBINARY/VARCHAR(MAX) which have a 8 byte length, although data types are still limited to 2GB.
1.9.8