Data type codes
This header file defines the following ODBC data type codes (at around line 187 or so):
/* SQL data type codes */
#define SQL_UNKNOWN_TYPE 0
#define SQL_CHAR 1
#define SQL_NUMERIC 2
#define SQL_DECIMAL 3
#define SQL_INTEGER 4
#define SQL_SMALLINT 5
#define SQL_FLOAT 6
#define SQL_REAL 7
#define SQL_DOUBLE 8
#if (ODBCVER >= 0x0300)
#define SQL_DATETIME 9
#endif
#define SQL_VARCHAR 12
/* One-parameter shortcuts for date/time data types */
#if (ODBCVER >= 0x0300)
#define SQL_TYPE_DATE 91
#define SQL_TYPE_TIME 92
#define SQL_TYPE_TIMESTAMP 93
#endif