# tds.h File Reference

Main include file for libtds. More...

`#include <stdio.h>`
`#include <stdarg.h>`
`#include <time.h>`
`#include "tdsver.h"`
`#include "tds_sysdep_public.h"`

Go to the source code of this file.

## Defines

#define | CANCEL_PROCESS 2
#define | GOTO_1ST_ROW 3
#define | is_ascii_type(x) ( x==XSYBCHAR || x==XSYBVARCHAR || x==SYBTEXT || x==SYBCHAR || x==SYBVARCHAR)
#define | is_binary_type(x) (x==SYBLONGBINARY)
#define | is_blob_type(x) (x==SYBTEXT || x==SYBIMAGE || x==SYBNTEXT)
#define | is_char_type(x) (is_unicode_type(x) || is_ascii_type(x))
#define | IS_CLOSE 400
#define | is_collate_type(x) (x==XSYBVARCHAR || x==XSYBCHAR || x==SYBTEXT || x==XSYBNVARCHAR || x==XSYBNCHAR || x==SYBNTEXT)
#define | IS_CURROW 200
#define | IS_DECLARE 100
#define | is_end_token(x)
#define | is_fixed_type(x)
#define | is_hard_end_token(x)
#define | is_msg_token(x)
#define | is_nullable_type(x)
#define | is_numeric_type(x) (x==SYBNUMERIC || x==SYBDECIMAL)
#define | IS_OPEN 300
#define | is_result_token(x)
#define | is_similar_type(x, y) ((is_char_type(x) && is_char_type(y)) || ((is_unicode_type(x) && is_unicode_type(y))))
#define | IS_TDS42(x) (x->major_version==4 && x->minor_version==2)
#define | IS_TDS46(x) (x->major_version==4 && x->minor_version==6)
#define | IS_TDS50(x) (x->major_version==5 && x->minor_version==0)
#define | IS_TDS70(x) (x->major_version==7 && x->minor_version==0)
#define | IS_TDS7_PLUS(x) ( IS_TDS70(x) || IS_TDS80(x) )
#define | IS_TDS80(x) (x->major_version==8 && x->minor_version==0)
#define | IS_TDSDEAD(x) (((x) == NULL) || TDS_IS_SOCKET_INVALID((x)->s))
#define | is_unicode_type(x) (x==XSYBNVARCHAR || x==XSYBNCHAR || x==SYBNTEXT)
#define | LOGIN 4
#define | MAXPRECISION 80
#define | PROCESS_RESULTS 1
#define | PROCESS_ROWS 0
#define | SYBAOPAVG 0x4f
#define | SYBAOPAVGU 0x50
#define | SYBAOPCHECKSUM_AGG 0x72
#define | SYBAOPCNT 0x4b
#define | SYBAOPCNT_BIG 0x09
#define | SYBAOPCNTU 0x4c
#define | SYBAOPMAX 0x52
#define | SYBAOPMIN 0x51
#define | SYBAOPSTDEV 0x30
#define | SYBAOPSTDEVP 0x31
#define | SYBAOPSUM 0x4d
#define | SYBAOPSUMU 0x4e
#define | SYBAOPVAR 0x32
#define | SYBAOPVARP 0x33
#define | SYBBINARY SYBBINARY
#define | SYBBIT SYBBIT
#define | SYBBITN SYBBITN
#define | SYBCHAR SYBCHAR
#define | SYBDATETIME SYBDATETIME
#define | SYBDATETIME4 SYBDATETIME4
#define | SYBDATETIMN SYBDATETIMN
#define | SYBDECIMAL SYBDECIMAL
#define | SYBFLT8 SYBFLT8
#define | SYBFLTN SYBFLTN
#define | SYBIMAGE SYBIMAGE
#define | SYBINT1 SYBINT1
#define | SYBINT2 SYBINT2
#define | SYBINT4 SYBINT4
#define | SYBINT8 SYBINT8
#define | SYBINTN SYBINTN
#define | SYBLONGBINARY SYBLONGBINARY
#define | SYBMONEY SYBMONEY
#define | SYBMONEY4 SYBMONEY4
#define | SYBMONEYN SYBMONEYN
#define | SYBNTEXT SYBNTEXT
#define | SYBNUMERIC SYBNUMERIC
#define | SYBNVARCHAR SYBNVARCHAR
#define | SYBREAL SYBREAL
#define | SYBSINT1 SYBSINT1
#define | SYBTEXT SYBTEXT
#define | SYBUINT2 SYBUINT2
#define | SYBUINT4 SYBUINT4
#define | SYBUINT8 SYBUINT8
#define | SYBUNIQUE SYBUNIQUE
#define | SYBVARBINARY SYBVARBINARY
#define | SYBVARCHAR SYBVARCHAR
#define | SYBVARIANT SYBVARIANT
#define | SYBVOID SYBVOID
#define | TDS5_DYNAMIC_TOKEN 231
#define | TDS5_PARAMFMT2_TOKEN 32
#define | TDS5_PARAMFMT_TOKEN 236
#define | TDS5_PARAMS_TOKEN 215
#define | TDS7_COMPUTE_RESULT_TOKEN 136
#define | TDS7_RESULT_TOKEN 129
#define | TDS_ALIGN_SIZE sizeof(tds_align_struct)
#define | TDS_AUTH_TOKEN 237
#define | TDS_BYTE_SWAP16(value)
#define | TDS_BYTE_SWAP32(value)
#define | TDS_CANCELLED 3
#define | TDS_CAPABILITY_TOKEN 226
#define | TDS_CMD_DONE 4046
#define | TDS_CMD_FAIL 4048
#define | TDS_CMD_SUCCEED 4047
#define | TDS_CMP_ROW_TOKEN 211
#define | TDS_COLFMT_TOKEN 161
#define | TDS_COLINFO_TOKEN 165
#define | TDS_COLNAME_TOKEN 160
#define | TDS_COMPUTE_NAMES_TOKEN 167
#define | TDS_COMPUTE_RESULT 4045
#define | TDS_COMPUTE_RESULT_TOKEN 168
#define | TDS_COMPUTEFMT_RESULT 4050
#define | TDS_CONTROL_TOKEN 174
#define | TDS_CURCLOSE_TOKEN 128
#define | TDS_CURDECLARE_TOKEN 134
#define | TDS_CURFETCH_TOKEN 130
#define | TDS_CURINFO_TOKEN 131
#define | TDS_CUROPEN_TOKEN 132
#define | TDS_DBG_ERROR __FILE__, ((__LINE__ << 4) | 2)
#define | TDS_DBG_FUNC __FILE__, ((__LINE__ << 4) | 7)
#define | TDS_DBG_INFO1 __FILE__, ((__LINE__ << 4) | 5)
#define | TDS_DBG_INFO2 __FILE__, ((__LINE__ << 4) | 6)
#define | TDS_DBG_NETWORK __FILE__, ((__LINE__ << 4) | 4)
#define | TDS_DBG_SEVERE __FILE__, ((__LINE__ << 4) | 1)
#define | TDS_DBG_WARN __FILE__, ((__LINE__ << 4) | 3)
#define | TDS_DBGFLAG_ALLLVL 0xfff
#define | TDS_DBGFLAG_ERROR 0x04
#define | TDS_DBGFLAG_FUNC 0x80
#define | TDS_DBGFLAG_INFO1 0x20
#define | TDS_DBGFLAG_INFO2 0x40
#define | TDS_DBGFLAG_NETWORK 0x10
#define | TDS_DBGFLAG_PID 0x1000
#define | TDS_DBGFLAG_SEVERE 0x02
#define | TDS_DBGFLAG_SOURCE 0x4000
#define | TDS_DBGFLAG_THREAD 0x8000
#define | TDS_DBGFLAG_TIME 0x2000
#define | TDS_DBGFLAG_WARN 0x08
#define | TDS_DBRPC_TOKEN 230
#define | TDS_DEF_BLKSZ 512
#define | TDS_DEF_CHARSET "iso_1"
#define | TDS_DEF_LANG "us_english"
#define | TDS_DEF_MAJOR 5
#define | TDS_DEF_MINOR 0
#define | TDS_DEF_PORT 4000
#define | TDS_DEF_SERVER "SYBASE"
#define | TDS_DESCRIBE_RESULT 4051
#define | TDS_DONE_RESULT 4052
#define | TDS_DONE_TOKEN 253
#define | TDS_DONEINPROC_RESULT 4054
#define | TDS_DONEINPROC_TOKEN 255
#define | TDS_DONEPROC_RESULT 4053
#define | TDS_DONEPROC_TOKEN 254
#define | TDS_DONT_RETURN 42
#define | TDS_DYNAMIC2_TOKEN 163
#define | TDS_EED_TOKEN 229
#define | TDS_ENV_CHARSET 3
#define | TDS_ENV_DATABASE 1
#define | TDS_ENV_LANG 2
#define | TDS_ENV_LCID 5
#define | TDS_ENV_PACKSIZE 4
#define | TDS_ENV_SQLCOLLATION 7
#define | TDS_ENVCHANGE_TOKEN 227
#define | TDS_ERROR 3
#define | TDS_ERROR_TOKEN 170
#define | TDS_FAIL 0
#define | TDS_INFO_TOKEN 171
#define | TDS_INT_CANCEL 2
#define | TDS_INT_CONTINUE 1
#define | TDS_INT_EXIT 0
#define | TDS_INT_TIMEOUT 3
#define | TDS_IS_MSSQL(x) ((x->product_version & 0x80000000u)!=0)
| Check if product is Microsft SQL Server.
#define | TDS_IS_SYBASE(x) (!(x->product_version & 0x80000000u))
| Check if product is Sybase (such as Adaptive Server Enterrprice).
#define | TDS_LANGUAGE_TOKEN 33
#define | TDS_LOGINACK_TOKEN 173
#define | TDS_LOGOUT_TOKEN 113
#define | TDS_MAX_CAPABILITY 22
#define | TDS_MAX_CONN 4096
#define | TDS_MAX_DYNID_LEN 30
#define | TDS_MAX_LOGIN_STR_SZ 30
#define | TDS_MS_VER(maj, min, x) (0x80000000u|((maj)<<24)|((min)<<16)|(x))
| Calc a version number for mssql.
#define | TDS_MSG_RESULT 4044
#define | TDS_NO_COUNT -1
#define | TDS_NO_MORE_RESULTS 2
#define | TDS_NULLTERM -9
#define | TDS_OPTIONCMD_TOKEN 166
#define | TDS_ORDERBY2_TOKEN 34
#define | TDS_ORDERBY_TOKEN 169
#define | TDS_OTHERS_RESULT 4055
#define | TDS_PARAM_RESULT 4042
#define | TDS_PARAM_TOKEN 172
#define | TDS_PROCID_TOKEN 124
#define | tds_put_tinyint(tds, ti) tds_put_byte(tds,ti)
| Output a tinyint value.
#define | TDS_RESULT_TOKEN 238
#define | TDS_RETURNSTATUS_TOKEN 121
#define | TDS_ROW_RESULT 4040
#define | TDS_ROW_TOKEN 209
#define | TDS_ROWFMT2_TOKEN 97
#define | TDS_ROWFMT_RESULT 4049
#define | TDS_SF_ACCENT_SENSITIVE (TDS_USMALLINT) 0x020
#define | TDS_SF_BIN (TDS_USMALLINT) 0x100
#define | TDS_SF_CASE_INSENSITIVE (TDS_USMALLINT) 0x010
#define | TDS_SF_KATATYPE_INSENSITIVE (TDS_USMALLINT) 0x040
#define | TDS_SF_WIDTH_INSENSITIVE (TDS_USMALLINT) 0x080
#define | TDS_SP_CURSOR 1
#define | TDS_SP_CURSORCLOSE 9
#define | TDS_SP_CURSOREXECUTE 4
#define | TDS_SP_CURSORFETCH 7
#define | TDS_SP_CURSOROPEN 2
#define | TDS_SP_CURSOROPTION 8
#define | TDS_SP_CURSORPREPARE 3
#define | TDS_SP_CURSORPREPEXEC 5
#define | TDS_SP_CURSORUNPREPARE 6
#define | TDS_SP_EXECUTE 12
#define | TDS_SP_EXECUTESQL 10
#define | TDS_SP_PREPARE 11
#define | TDS_SP_PREPEXEC 13
#define | TDS_SP_PREPEXECRPC 14
#define | TDS_SP_UNPREPARE 15
#define | TDS_STATUS_RESULT 4043
#define | TDS_STR_APPENDMODE "dump file append"
#define | TDS_STR_BLKSZ "initial block size"
#define | TDS_STR_CHARSET "charset"
#define | TDS_STR_CLCHARSET "client charset"
#define | TDS_STR_CONNTIMEOUT "connect timeout"
#define | TDS_STR_DATEFMT "date format"
#define | TDS_STR_DEBUGFLAGS "debug flags"
#define | TDS_STR_DEBUGLVL "debug level"
#define | TDS_STR_DUMPFILE "dump file"
#define | TDS_STR_EMUL_LE "emulate little endian"
#define | TDS_STR_HOST "host"
#define | TDS_STR_HOSTNAME "hostname"
#define | TDS_STR_INSTANCE "instance"
#define | TDS_STR_LANGUAGE "language"
#define | TDS_STR_PORT "port"
#define | TDS_STR_QUERY_TIMEOUT "query timeout"
#define | TDS_STR_SWAPDT "swap broken dates"
#define | TDS_STR_SWAPMNY "swap broken money"
#define | TDS_STR_TEXTSZ "text size"
#define | TDS_STR_TIMEOUT "timeout"
#define | TDS_STR_VERSION "tds version"
#define | TDS_SUCCEED 1
#define | TDS_SYB_VER(maj, min, x) (((maj)<<24)|((min)<<16)|(x)<<8)
| Calc a version number for Sybase.
#define | TDS_TABNAME_TOKEN 164
#define | TDS_TOKEN_FLAG(flag) TDS_RETURN_##flag = (1 << (TDS_TOKEN_RES_##flag*2)), TDS_STOPAT_##flag = (2 << (TDS_TOKEN_RES_##flag*2))
#define | TDS_UT_TIMESTAMP 80
#define | TDS_VECTOR_SIZE(x) (sizeof(x)/sizeof(x[0]))
#define | TDS_ZERO_FREE(x) do {free((x)); (x) = NULL;} while(0)
#define | XSYBBINARY XSYBBINARY
#define | XSYBCHAR XSYBCHAR
#define | XSYBNCHAR XSYBNCHAR
#define | XSYBNVARCHAR XSYBNVARCHAR
#define | XSYBVARBINARY XSYBVARBINARY
#define | XSYBVARCHAR XSYBVARCHAR

## Typedefs

typedef _tds_bcpcoldata | BCPCOLDATA
typedef DSTR_STRUCT * | DSTR
typedef char | TDS_CHAR
typedef _tds_compiletime_settings | TDS_COMPILETIME_SETTINGS
| A structure to hold all the compile-time settings.
typedef _tds_cursor_status | TDS_CURSOR_STATUS
typedef tdsdatetime | TDS_DATETIME
typedef tdsdatetime4 | TDS_DATETIME4
typedef _tds_encoding | TDS_ENCODING
| Information relevant to libiconv.
typedef tds_sysdep_real64_type | TDS_FLOAT
typedef tds_sysdep_int32_type | TDS_INT
typedef tds_sysdep_int64_type | TDS_INT8
typedef tds_sysdep_intptr_type | TDS_INTPTR
typedef tdsmoney | TDS_MONEY
typedef tdsmoney4 | TDS_MONEY4
typedef tdsnumeric | TDS_NUMERIC
typedef tdsoldmoney | TDS_OLD_MONEY
typedef tds_option_arg | TDS_OPTION_ARG
typedef enum tds_packet_type | TDS_PACKET_TYPE
typedef tds_sysdep_real32_type | TDS_REAL
typedef tds_sysdep_int16_type | TDS_SMALLINT
typedef enum _TDS_STATE | TDS_STATE
typedef unsigned char | TDS_TINYINT
typedef unsigned char | TDS_UCHAR
typedef unsigned tds_sysdep_int32_type | TDS_UINT
typedef unsigned tds_sysdep_int64_type | TDS_UINT8
typedef tdsunique | TDS_UNIQUE
typedef unsigned tds_sysdep_int16_type | TDS_USMALLINT
typedef tdsvarbinary | TDS_VARBINARY
typedef tdsvarchar | TDS_VARCHAR
typedef tds_answer | TDSANSWER
typedef tds_blob | TDSBLOB
| Information about blobs (e.g.
typedef tds_column | TDSCOLUMN
| Metadata about columns in regular and compute rows.
typedef tds_result_info | TDSCOMPUTEINFO
typedef void(* | TDSCONFPARSE )(const char *option, const char *value, void *param)
typedef tds_connection | TDSCONNECTION
typedef tds_context | TDSCONTEXT
typedef _tds_cursor | TDSCURSOR
typedef tdsdaterec | TDSDATEREC
| information on data, used by tds_datecrack
typedef tds_dynamic | TDSDYNAMIC
typedef tds_env | TDSENV
typedef tdsiconvinfo | TDSICONV
typedef tds_locale | TDSLOCALE
typedef tds_login | TDSLOGIN
typedef tds_message | TDSMESSAGE
typedef tds_multiple | TDSMULTIPLE
typedef TDSRESULTINFO | TDSPARAMINFO
typedef tds_result_info | TDSRESULTINFO
| Hold information for any results.
typedef tds_socket | TDSSOCKET
typedef tds_upd_col | TDSUPDCOL

## Enumerations

enum | { TDS_CUR_ISTAT_UNUSED = 0x00, TDS_CUR_ISTAT_DECLARED = 0x01, TDS_CUR_ISTAT_OPEN = 0x02, TDS_CUR_ISTAT_CLOSED = 0x04, TDS_CUR_ISTAT_RDONLY = 0x08, TDS_CUR_ISTAT_UPDATABLE = 0x10, TDS_CUR_ISTAT_ROWCNT = 0x20, TDS_CUR_ISTAT_DEALLOC = 0x40 }
enum | { TDS_OPT_ARITHOVERFLOW = 0x01, TDS_OPT_NUMERICTRUNC = 0x02 }
enum | { TDS_SYSNAME_SIZE = 512 }
enum | _TDS_STATE { TDS_IDLE, TDS_QUERYING, TDS_PENDING, TDS_READING, TDS_DEAD }
enum | TDS_CURSOR_STATE { TDS_CURSOR_STATE_UNACTIONED = 0, TDS_CURSOR_STATE_REQUESTED = 1, TDS_CURSOR_STATE_SENT = 2, TDS_CURSOR_STATE_ACTIONED = 3 }
enum | TDS_DBG_LOG_STATE { TDS_DBG_LOGIN = 1, TDS_DBG_API = (1 << 1), TDS_DBG_ASYNC = (1 << 2), TDS_DBG_DIAG = (1 << 3), TDS_DBG_error = (1 << 4), TDS_DBG_PACKET = (1 << 5), TDS_DBG_LIBTDS = (1 << 6), TDS_DBG_CONFIG = (1 << 7), TDS_DBG_DEFAULT = 0xFE }
| An attempt at better logging. More...
enum | tds_end { TDS_DONE_FINAL = 0x00, TDS_DONE_MORE_RESULTS = 0x01, TDS_DONE_ERROR = 0x02, TDS_DONE_INXACT = 0x04, TDS_DONE_PROC = 0x08, TDS_DONE_COUNT = 0x10, TDS_DONE_CANCELLED = 0x20, TDS_DONE_EVENT = 0x40, TDS_DONE_SRVERROR = 0x100, TDS_DONE_NO_TRAN = 0, TDS_DONE_TRAN_SUCCEED = 1, TDS_DONE_TRAN_PROGRESS = 2, TDS_DONE_STMT_ABORT = 3, TDS_DONE_TRAN_ABORT = 4 }
enum | TDS_ICONV_ENTRY { client2ucs2, client2server_chardata, iso2server_metadata, initial_char_conv_count }
enum | TDS_MULTIPLE_TYPE { TDS_MULTIPLE_QUERY, TDS_MULTIPLE_EXECUTE, TDS_MULTIPLE_RPC }
enum | TDS_OPT_DATEFIRST_CHOICE { TDS_OPT_MONDAY = 1, TDS_OPT_TUESDAY = 2, TDS_OPT_WEDNESDAY = 3, TDS_OPT_THURSDAY = 4, TDS_OPT_FRIDAY = 5, TDS_OPT_SATURDAY, TDS_OPT_SUNDAY = 7 }
enum | TDS_OPT_DATEFORMAT_CHOICE { TDS_OPT_FMTMDY = 1, TDS_OPT_FMTDMY = 2, TDS_OPT_FMTYMD = 3, TDS_OPT_FMTYDM = 4, TDS_OPT_FMTMYD = 5, TDS_OPT_FMTDYM = 6 }
enum | TDS_OPT_ISOLATION_CHOICE { TDS_OPT_LEVEL1 = 1, TDS_OPT_LEVEL3 = 3 }

enum

TDS_OPTION {
TDS_OPT_DATEFIRST = 1, TDS_OPT_TEXTSIZE = 2, TDS_OPT_STAT_TIME = 3, TDS_OPT_STAT_IO = 4,
TDS_OPT_ROWCOUNT = 5, TDS_OPT_NATLANG = 6, TDS_OPT_DATEFORMAT = 7, TDS_OPT_ISOLATION = 8,
TDS_OPT_AUTHON = 9, TDS_OPT_CHARSET = 10, TDS_OPT_SHOWPLAN = 13, TDS_OPT_NOEXEC = 14,
TDS_OPT_ARITHIGNOREON = 15, TDS_OPT_ARITHABORTON = 17, TDS_OPT_PARSEONLY = 18, TDS_OPT_GETDATA = 20,
TDS_OPT_NOCOUNT = 21, TDS_OPT_FORCEPLAN = 23, TDS_OPT_FORMATONLY = 24, TDS_OPT_CHAINXACTS = 25,
TDS_OPT_CURCLOSEONXACT = 26, TDS_OPT_FIPSFLAG = 27, TDS_OPT_RESTREES = 28, TDS_OPT_IDENTITYON = 29,
TDS_OPT_CURREAD = 30, TDS_OPT_CURWRITE = 31, TDS_OPT_IDENTITYOFF = 32, TDS_OPT_AUTHOFF = 33,
TDS_OPT_ANSINULL = 34, TDS_OPT_QUOTED_IDENT = 35, TDS_OPT_ARITHIGNOREOFF = 36, TDS_OPT_ARITHABORTOFF = 37,
TDS_OPT_TRUNCABORT = 38
}

enum | TDS_OPTION_CMD { TDS_OPT_SET = 1, TDS_OPT_DEFAULT = 2, TDS_OPT_LIST = 3, TDS_OPT_INFO = 4 }
| options that can be sent with a TDS_OPTIONCMD token
enum | tds_packet_type { TDS_QUERY = 1, TDS_RPC = 3, TDS_CANCEL = 6, TDS_BULK = 7, TDS_NORMAL = 15 }

enum

TDS_SERVER_TYPE {
SYBCHAR = 47, SYBVARCHAR = 39, SYBINTN = 38, SYBINT1 = 48,
SYBINT2 = 52, SYBINT4 = 56, SYBINT8 = 127, SYBFLT8 = 62,
SYBDATETIME = 61, SYBBIT = 50, SYBTEXT = 35, SYBNTEXT = 99,
SYBIMAGE = 34, SYBMONEY4 = 122, SYBMONEY = 60, SYBDATETIME4 = 58,
SYBREAL = 59, SYBBINARY = 45, SYBVOID = 31, SYBVARBINARY = 37,
SYBNVARCHAR = 103, SYBBITN = 104, SYBNUMERIC = 108, SYBDECIMAL = 106,
SYBFLTN = 109, SYBMONEYN = 110, SYBDATETIMN = 111, XSYBCHAR = 175,
XSYBVARCHAR = 167, XSYBNVARCHAR = 231, XSYBNCHAR = 239, XSYBVARBINARY = 165,
XSYBBINARY = 173, SYBLONGBINARY = 225, SYBSINT1 = 64, SYBUINT2 = 65,
SYBUINT4 = 66, SYBUINT8 = 67, SYBUNIQUE = 36, SYBVARIANT
}

enum | tds_token_flags { TDS_HANDLE_ALL = 0, OTHERS, ROWFMT, COMPUTEFMT, PARAMFMT, DONE, ROW, COMPUTE, PROC, MSG, TDS_TOKEN_RESULTS = TDS_RETURN_ROWFMT|TDS_RETURN_COMPUTEFMT|TDS_RETURN_DONE|TDS_STOPAT_ROW|TDS_STOPAT_COMPUTE|TDS_RETURN_PROC, TDS_TOKEN_TRAILING = TDS_STOPAT_ROWFMT|TDS_STOPAT_COMPUTEFMT|TDS_STOPAT_ROW|TDS_STOPAT_COMPUTE|TDS_STOPAT_MSG|TDS_STOPAT_OTHERS }
enum | tds_token_results { TDS_TOKEN_RES_OTHERS, TDS_TOKEN_RES_ROWFMT, TDS_TOKEN_RES_COMPUTEFMT, TDS_TOKEN_RES_PARAMFMT, TDS_TOKEN_RES_DONE, TDS_TOKEN_RES_ROW, TDS_TOKEN_RES_COMPUTE, TDS_TOKEN_RES_PROC, TDS_TOKEN_RES_MSG }
enum | TDS_USER_TYPE { USER_UNICHAR_TYPE = 34, USER_UNIVARCHAR_TYPE = 35 }

## Functions

int | tds5_send_optioncmd (TDSSOCKET *tds, TDS_OPTION_CMD tds_command, TDS_OPTION tds_option, TDS_OPTION_ARG *tds_argument, TDS_INT *tds_argsize)
unsigned char * | tds7_crypt_pass (const unsigned char *clear_pass, int len, unsigned char *crypt_pass)
| tds7_crypt_pass() -- 'encrypt' TDS 7.0 style passwords.
int | tds7_get_instance_port (const char *ip_addr, const char *instance)
| Get port of given instance.
int | tds7_send_auth (TDSSOCKET *tds, const unsigned char *challenge)
void | tds7_srv_charset_changed (TDSSOCKET *tds, int sql_collate, int lcid)
void | tds_add_row_column_size (TDSRESULTINFO *info, TDSCOLUMN *curcol)
| Add a column size to result info row size and calc offset into row.
BCPCOLDATA * | tds_alloc_bcp_column_data (int column_size)
char * | tds_alloc_client_sqlstate (int msgno)
TDSCOMPUTEINFO ** | tds_alloc_compute_results (TDSSOCKET *tds, int num_cols, int by_cols)
unsigned char * | tds_alloc_compute_row (TDSCOMPUTEINFO *res_info)
TDSCONNECTION * | tds_alloc_connection (TDSLOCALE *locale)
| Allocate space for configure structure and initialize with default values.
TDSCONTEXT * | tds_alloc_context (void *parent)
TDSCURSOR * | tds_alloc_cursor (TDSSOCKET *tds, const char *name, TDS_INT namelen, const char *query, TDS_INT querylen)
TDSDYNAMIC * | tds_alloc_dynamic (TDSSOCKET *tds, const char *id)
| Allocate a dynamic statement.
int | tds_alloc_get_string (TDSSOCKET *tds, char **string, int len)
| Read a string from wire in a new allocated buffer.
TDSLOCALE * | tds_alloc_locale (void)
TDSLOGIN * | tds_alloc_login (void)
char * | tds_alloc_lookup_sqlstate (TDSSOCKET *tds, int msgno)
TDSPARAMINFO * | tds_alloc_param_result (TDSPARAMINFO *old_param)
| Adds a output parameter to TDSPARAMINFO.
unsigned char * | tds_alloc_param_row (TDSPARAMINFO *info, TDSCOLUMN *curparam)
| Add another field to row.
TDSRESULTINFO * | tds_alloc_results (int num_cols)
unsigned char * | tds_alloc_row (TDSRESULTINFO *res_info)
| Allocate space for row store return NULL on out of memory.
TDSSOCKET * | tds_alloc_socket (TDSCONTEXT *context, int bufsize)
void | tds_answer_challenge (const char *passwd, const unsigned char *challenge, TDSANSWER *answer)
| Crypt a given password using schema required for NTLMv1 authentication.
int | tds_client_msg (const TDSCONTEXT *tds_ctx, TDSSOCKET *tds, int msgno, int severity, int state, int line, const char *message)
| tds_client_msg() sends a message to the client application from the CLI or TDS layer.
int | tds_close_socket (TDSSOCKET *tds)
void | tds_config_verstr (const char *tdsver, TDSCONNECTION *connection)
| Set TDS version from given string.
int | tds_connect (TDSSOCKET *tds, TDSCONNECTION *connection)
| Do a connection to socket.
int | tds_count_placeholders (const char *query)
| Count the number of placeholders in query.
int | tds_cursor_close (TDSSOCKET *tds, TDSCURSOR *cursor)
int | tds_cursor_dealloc (TDSSOCKET *tds, TDSCURSOR *cursor)
int | tds_cursor_declare (TDSSOCKET *tds, TDSCURSOR *cursor, int *send)
int | tds_cursor_fetch (TDSSOCKET *tds, TDSCURSOR *cursor)
int | tds_cursor_open (TDSSOCKET *tds, TDSCURSOR *cursor, int *send)
int | tds_cursor_setrows (TDSSOCKET *tds, TDSCURSOR *cursor, int *send)
TDS_INT | tds_datecrack (TDS_INT datetype, const void *di, TDSDATEREC *dr)
| Convert from db date format to a structured date format.
void | tds_fix_connection (TDSCONNECTION *connection)
| Fix configuration after reading it.
int | tds_flush_packet (TDSSOCKET *tds)
| Flush packet to server.
void | tds_free_all_results (TDSSOCKET *tds)
void | tds_free_bcp_column_data (BCPCOLDATA *coldata)
void | tds_free_connection (TDSCONNECTION *connection)
void | tds_free_context (TDSCONTEXT *locale)
void | tds_free_cursor (TDSSOCKET *tds, TDSCURSOR *cursor)
void | tds_free_dynamic (TDSSOCKET *tds, TDSDYNAMIC *dyn)
| Frees dynamic statement and remove from TDS.
void | tds_free_input_params (TDSDYNAMIC *dyn)
| Frees all allocated input parameters of a dynamic statement.
void | tds_free_locale (TDSLOCALE *locale)
void | tds_free_login (TDSLOGIN *login)
void | tds_free_msg (TDSMESSAGE *message)
void | tds_free_param_result (TDSPARAMINFO *param_info)
| Delete latest parameter.
void | tds_free_param_results (TDSPARAMINFO *param_info)
void | tds_free_result_info (TDSRESULTINFO *info)
void | tds_free_results (TDSRESULTINFO *res_info)
void | tds_free_row (const TDSRESULTINFO *res_info, unsigned char *row)
void | tds_free_socket (TDSSOCKET *tds)
unsigned char | tds_get_byte (TDSSOCKET *tds)
int | tds_get_char_data (TDSSOCKET *tds, char *dest, size_t wire_size, TDSCOLUMN *curcol)
| Fetch character data the wire.
const TDS_COMPILETIME_SETTINGS * | tds_get_compiletime_settings (void)
| Return a structure capturing the compile-time settings provided to the configure script.
int | tds_get_conversion_type (int srctype, int colsize)
| Return type suitable for conversions (convert all nullable types to fixed type).
int | tds_get_dynid (TDSSOCKET *tds, char **id)
| Get an id for dynamic query based on TDS information.
char * | tds_get_homedir (void)
| Get user home directory.
TDS_INT | tds_get_int (TDSSOCKET *tds)
| Get an int32 from the server.
TDSLOCALE * | tds_get_locale (void)
| Get locale information.
void * | tds_get_n (TDSSOCKET *tds, void *dest, int n)
| Get N bytes from the buffer and return them in the already allocated space given to us.
void * | tds_get_parent (TDSSOCKET *tds)
int | tds_get_size_by_type (int servertype)
| Return the number of bytes needed by specified type.
TDS_SMALLINT | tds_get_smallint (TDSSOCKET *tds)
| Get an int16 from the server.
int | tds_get_string (TDSSOCKET *tds, int string_len, char *dest, size_t dest_size)
| Fetch a string from the wire.
int | tds_get_token_size (int marker)
| tds_get_token_size() returns the size of a fixed length token used by tds_process_cancel() to determine how to read past a token
hostent * | tds_gethostbyaddr_r (const char *addr, int len, int type, struct hostent *result, char *buffer, int buflen, int *h_errnop)
hostent * | tds_gethostbyname_r (const char *servername, struct hostent *result, char *buffer, int buflen, int *h_errnop)
void | tds_getmac (int s, unsigned char mac[6])
servent * | tds_getservbyname_r (const char *name, const char *proto, struct servent *result, char *buffer, int buflen)
int | tds_iconv_alloc (TDSSOCKET *tds)
| Allocate iconv stuff.
void | tds_iconv_close (TDSSOCKET *tds)
void | tds_iconv_free (TDSSOCKET *tds)
TDSICONV * | tds_iconv_from_collate (TDSSOCKET *tds, int sql_collate, int lcid)
| Get iconv information from a LCID (to support different column encoding under MSSQL2K).
void | tds_iconv_open (TDSSOCKET *tds, const char *charset)
int | tds_init_write_buf (TDSSOCKET *tds)
TDSDYNAMIC * | tds_lookup_dynamic (TDSSOCKET *tds, char *id)
| Find a dynamic given string id.
void | tds_lookup_host (const char *servername, char *ip)
| Given a servername and port name or number, lookup the hostname and service.
char * | tds_money_to_string (const TDS_MONEY *money, char *s)
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.
TDS_INT | tds_numeric_change_prec_scale (TDS_NUMERIC *numeric, unsigned char new_prec, unsigned char new_scale)
TDS_INT | tds_numeric_to_string (const TDS_NUMERIC *numeric, char *s)
int | tds_open_socket (TDSSOCKET *tds, const char *ip_addr, unsigned int port, int timeout)
unsigned char | tds_peek (TDSSOCKET *tds)
int | tds_process_cancel (TDSSOCKET *tds)
| tds_process_cancel() processes the incoming token stream until it finds an end token (DONE, DONEPROC, DONEINPROC) with the cancel flag set.
int | tds_process_login_tokens (TDSSOCKET *tds)
| tds_process_login_tokens() is called after sending the login packet to the server.
int | tds_process_simple_query (TDSSOCKET *tds)
| Process results for simple query as "SET TEXTSIZE" or "USE dbname" If the statement returns results, beware they are discarded.
int | tds_process_tokens (TDSSOCKET *tds, TDS_INT *result_type, int *done_flags, unsigned flag)
| process all streams.
const char * | tds_prtype (int token)
int | tds_put_buf (TDSSOCKET *tds, const unsigned char *buf, int dsize, int ssize)
int | tds_put_byte (TDSSOCKET *tds, unsigned char c)
int | tds_put_int (TDSSOCKET *tds, TDS_INT i)
int | tds_put_int8 (TDSSOCKET *tds, TDS_INT8 i)
int | tds_put_n (TDSSOCKET *tds, const void *buf, int n)
int | tds_put_smallint (TDSSOCKET *tds, TDS_SMALLINT si)
int | tds_put_string (TDSSOCKET *tds, const char *buf, int len)
| Output a string to wire automatic translate string to unicode if needed.
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_read_conf_file (TDSCONNECTION *connection, const char *server)
| Read configuration info for given server return 0 on error.
int | tds_read_conf_section (FILE *in, const char *section, TDSCONFPARSE tds_conf_parse, void *parse_param)
| Read a section of configuration file (INI style file).
TDSCONNECTION * | tds_read_config_info (TDSSOCKET *tds, TDSLOGIN *login, TDSLOCALE *locale)

tds_read_config_info() will fill the tds connection structure based on configuration information gathered in the following order: 1) Program specified in TDSLOGIN structure 2) The environment variables TDSVER, TDSDUMP, TDSPORT, TDSQUERY, TDSHOST 3) A config file with the following search order: a) a readable file specified by environment variable FREETDSCONF b) a readable file in ~/.freetds.conf c) a readable file in $prefix/etc/freetds.conf 3) ~/.interfaces if exists 4) $SYBASE/interfaces if exists 5) TDS_DEF_* default values

int | tds_read_packet (TDSSOCKET *tds)
| Read in one 'packet' from the server.
TDSSOCKET * | tds_realloc_socket (TDSSOCKET *tds, int bufsize)
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.
void | tds_set_app (TDSLOGIN *tds_login, const char *application)
void | tds_set_bulk (TDSLOGIN *tds_login, TDS_TINYINT enabled)
void | tds_set_capabilities (TDSLOGIN *tds_login, unsigned char *capabilities, int size)
void | tds_set_client_charset (TDSLOGIN *tds_login, const char *charset)
void | tds_set_column_type (TDSCOLUMN *curcol, int type)
| Set type of column initializing all dependency.
void | tds_set_host (TDSLOGIN *tds_login, const char *hostname)
int | tds_set_interfaces_file_loc (const char *interfloc)
| Set the full name of interface file.
void | tds_set_language (TDSLOGIN *tds_login, const char *language)
void | tds_set_library (TDSLOGIN *tds_login, const char *library)
void | tds_set_packet (TDSLOGIN *tds_login, int packet_size)
void | tds_set_param_type (TDSSOCKET *tds, TDSCOLUMN *curcol, TDS_SERVER_TYPE type)
| Set type of column initializing all dependency.
void | tds_set_parent (TDSSOCKET *tds, void *the_parent)
void | tds_set_passwd (TDSLOGIN *tds_login, const char *password)
void | tds_set_port (TDSLOGIN *tds_login, int port)
void | tds_set_server (TDSLOGIN *tds_login, const char *server)
void | tds_set_server_addr (TDSLOGIN *tds_login, const char *server_addr)
TDS_STATE | tds_set_state (TDSSOCKET *tds, TDS_STATE state)
| Set state of TDS connection, with logging and checking.
void | tds_set_user (TDSLOGIN *tds_login, const char *username)
void | tds_set_version (TDSLOGIN *tds_login, short major_ver, short minor_ver)
const char * | tds_skip_quoted (const char *s)
| Skip quoting string (like 'sfsf', "dflkdj" or [dfkjd]).
void | tds_srv_charset_changed (TDSSOCKET *tds, const char *charset)
void | tds_ssl_deinit (TDSSOCKET *tds)
int | tds_ssl_init (TDSSOCKET *tds)
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.
int | tds_swap_bytes (unsigned char *buf, int bytes)
void | tds_swap_datatype (int coltype, unsigned char *buf)
void | tds_swap_numeric (TDS_NUMERIC *num)
char * | tds_timestamp_str (char *str, int maxlen)
void | tds_unget_byte (TDSSOCKET *tds)
| Unget will always work as long as you don't call it twice in a row.
int | tds_version (TDSSOCKET *tds_socket, char *pversion_string)
| Returns the version of the TDS protocol in effect for the link as a decimal integer.
int | tds_vstrbuild (char *buffer, int buflen, int *resultlen, char *text, int textlen, const char *formats, int formatlen, va_list ap)
int | tds_write_packet (TDSSOCKET *tds, unsigned char final)
void | tdsdump_close (void)
| Close the TDS dump log file.
void | tdsdump_dump_buf (const char *file, unsigned int level_line, const char *msg, const void *buf, int length)
| Dump the contents of data into the log file in a human readable format.
void | tdsdump_log (const char *file, unsigned int level_line, const char *fmt,...)
| This function write a message to the debug log.
void | tdsdump_off (void)
| Temporarily turn off logging.
void | tdsdump_on (void)
| Turn logging back on.
int | tdsdump_open (const char *filename)
| This creates and truncates a human readable dump file for the TDS traffic.

## Variables

static const void *const | no_unused_tds_h_warn [] = { rcsid_tds_h, no_unused_tds_h_warn }
static const char | rcsid_tds_h [] = "$Id: tds.h,v 1.245.2.1 2006/04/16 08:08:38 freddy77 Exp $"
int | tds_debug_flags
const char | tds_hex_digits []
const int | tds_numeric_bytes_per_prec []
| The following little table is indexed by precision and will tell us the number of bytes required to store the specified precision.

## Detailed Description

Main include file for libtds.

## Define Documentation

#define is_end_token | ( | x |  | ) |

Value:

    (x==TDS_DONE_TOKEN    || \
                            x==TDS_DONEPROC_TOKEN    || \
                            x==TDS_DONEINPROC_TOKEN)

#define is_fixed_type | ( | x |  | ) |

Value:

    (x==SYBINT1    || \
                            x==SYBINT2      || \
                            x==SYBINT4      || \
                            x==SYBINT8      || \
                            x==SYBREAL      || \
                            x==SYBFLT8      || \
                            x==SYBDATETIME  || \
                            x==SYBDATETIME4 || \
                            x==SYBBIT       || \
                            x==SYBMONEY     || \
                            x==SYBMONEY4    || \
                            x==SYBVOID      || \
                            x==SYBUNIQUE)

#define is_hard_end_token | ( | x |  | ) |

Value:

    (x==TDS_DONE_TOKEN    || \
                            x==TDS_DONEPROC_TOKEN)

#define is_msg_token | ( | x |  | ) |

Value:

    (x==TDS_INFO_TOKEN    || \
                            x==TDS_ERROR_TOKEN    || \
                            x==TDS_EED_TOKEN)

#define is_nullable_type | ( | x |  | ) |

Value:

    ( \
                            x==SYBBITN      || \
                         x==SYBINTN      || \
                         x==SYBFLTN      || \
                         x==SYBMONEYN    || \
                         x==SYBDATETIMN  || \
                         x==SYBVARCHAR   || \
                         x==SYBBINARY    || \
                         x==SYBVARBINARY || \
                         x==SYBTEXT      || \
                         x==SYBNTEXT     || \
                         x==SYBIMAGE)

#define is_result_token | ( | x |  | ) |

Value:

    (x==TDS_RESULT_TOKEN || \
                            x==TDS_ROWFMT2_TOKEN    || \
                            x==TDS7_RESULT_TOKEN    || \
                            x==TDS_COLFMT_TOKEN     || \
                            x==TDS_COLNAME_TOKEN    || \
                            x==TDS_RETURNSTATUS_TOKEN)

#define TDS_BYTE_SWAP16 | ( | value |  | ) |

Value:

    (((((unsigned short)value)<<8) & 0xFF00)   | \
              ((((unsigned short)value)>>8) & 0x00FF))

#define TDS_BYTE_SWAP32 | ( | value |  | ) |

Value:

    (((((unsigned long)value)<<24) & 0xFF000000)  | \
              ((((unsigned long)value)<< 8) & 0x00FF0000)  | \
              ((((unsigned long)value)>> 8) & 0x0000FF00)  | \
              ((((unsigned long)value)>>24) & 0x000000FF))

#define TDS_IS_MSSQL | ( | x |  | ) | ((x->product_version & 0x80000000u)!=0)

| Check if product is Microsft SQL Server. x should be a TDS_SOCKET*.

#define TDS_IS_SYBASE | ( | x |  | ) | (!(x->product_version & 0x80000000u))

| Check if product is Sybase (such as Adaptive Server Enterrprice). x should be a TDS_SOCKET*.

#define TDS_MS_VER | ( | maj,
|  | min,
|  | x |  | ) | (0x80000000u|((maj)<<24)|((min)<<16)|(x))

| Calc a version number for mssql. Use with TDS_MS_VER(7,0,842). For test for a range of version you can use check like if (tds->product_version >= TDS_MS_VER(7,0,0) && tds->product_version < TDS_MS_VER(8,0,0))

## Typedef Documentation

typedef struct _tds_compiletime_settings TDS_COMPILETIME_SETTINGS

| A structure to hold all the compile-time settings. This structure is returned by tds_get_compiletime_settings

typedef struct _tds_encoding TDS_ENCODING

| Information relevant to libiconv. The name is an iconv name, not the same as found in master..syslanguages.

typedef struct tds_blob TDSBLOB

| Information about blobs (e.g. text or image). current_row contains this structure.

## Enumeration Type Documentation

enum TDS_DBG_LOG_STATE

| An attempt at better logging. Using these bitmapped values, various logging features can be turned on and off. It can be especially helpful to turn packet data on/off for security reasons.

## Function Documentation

unsigned char* tds7_crypt_pass | ( | const unsigned char * | clear_pass,
|  | int | len,
|  | unsigned char * | crypt_pass
| ) |

| tds7_crypt_pass() -- 'encrypt' TDS 7.0 style passwords. the calling function is responsible for ensuring crypt_pass is at least 'len' characters

int tds_connect | ( | TDSSOCKET * | tds,
|  | TDSCONNECTION * | connection
| ) |

Do a connection to socket.

Parameters:

  | tds | connection structure. This should be a non-connected connection.
  | connection | info for connection

Returns:
  TDS_FAIL or TDS_SUCCEED

char* tds_get_homedir | ( | void |  | ) |

Get user home directory.

Returns:
  home directory or NULL if error. Should be freed with free

TDSLOCALE* tds_get_locale | ( | void |  | ) |

Get locale information.

Returns:
  allocated structure with all information or NULL if error

int tds_iconv_alloc | ( | TDSSOCKET * | tds | ) |

Allocate iconv stuff.

Returns:
  0 for success

void tds_set_column_type | ( | TDSCOLUMN * | curcol,
|  | int | type
| ) |

Set type of column initializing all dependency.

Parameters:

  | curcol | column to set
  | type | type to set

void tds_set_param_type | ( | TDSSOCKET * | tds,
|  | TDSCOLUMN * | curcol,
|  | TDS_SERVER_TYPE | type
| ) |

Set type of column initializing all dependency.

Parameters:

  | tds | state information for the socket and the TDS protocol
  | curcol | column to set
  | type | type to set

TDS_STATE tds_set_state | ( | TDSSOCKET * | tds,
|  | TDS_STATE | state
| ) |

Set state of TDS connection, with logging and checking.

Parameters:

  | tds | state information for the socket and the TDS protocol
  | state | the new state of the connection, cf. TDS_STATE.

Returns:
  the new state, which might not be state.

char* tds_timestamp_str | ( | char * | str,
|  | int | maxlen
| ) |

| strftime(str, maxlen - 6, "%Y-%m-%d %H:%M:%S", tm); *

int tds_version | ( | TDSSOCKET * | tds_socket,
|  | char * | pversion_string
| ) |

| Returns the version of the TDS protocol in effect for the link as a decimal integer. Typical returned values are 42, 50, 70, 80. Also fills pversion_string unless it is null. Typical pversion_string values are "4.2" and "7.0".

void tdsdump_dump_buf | ( | const char * | file,
|  | unsigned int | level_line,
|  | const char * | msg,
|  | const void * | buf,
|  | int | length
| ) |

Dump the contents of data into the log file in a human readable format.

Parameters:

  | msg | message to print before dump
  | buf | buffer to dump
  | length | number of bytes in the buffer

void tdsdump_log | ( | const char * | file,
|  | unsigned int | level_line,
|  | const char * | fmt,
|  |  | ...
| ) |

This function write a message to the debug log.

Parameters:

  | debug_lvl | level of debugging
  | fmt | printf-like format string

void tdsdump_on | ( | void |  | ) |

| Turn logging back on. You must call tdsdump_open() before calling this routine.

int tdsdump_open | ( | const char * | filename | ) |

This creates and truncates a human readable dump file for the TDS traffic.

The name of the file is specified by the filename parameter. If that is given as NULL or an empty string, any existing log file will be closed.

Returns:
  true if the file was opened, false if it couldn't be opened.

## Variable Documentation

const int tds_numeric_bytes_per_prec[]

| The following little table is indexed by precision and will tell us the number of bytes required to store the specified precision. Support precision up to 77 digits