SQL Descriptor Area (SQLDA) in C

struct sqlda
{
unsigned char sqldaid [8]; /* eye catcher: 'SQLDA' */
SAG_INTEGER sqldabc; /* size of sqlda in bytes */
short sqln; /* #sqlvar elements allocated*/
short sqld; /* #sqlvar elements returned */
struct sqlvar
{ SAGTYPE sqltype; /* datatype of variable */
SAG_INTEGER sqllen; /* length of variable */
SAG_INTEGER reserved; /* reserved */
short internal; /* reserved */
short sqlindlen; /* length of indicator */
SAG_INTEGER sqlindtype; /* datatype of indicator */
SAGPointer sqlind; /* pointer to indicator */
SAGPointer sqldata; /* pointer to data */
SAGCOLUMN sqlname; /* name of the column or HV */
} sqlvar [1];
};
#define SQLDASIZE(n) (sizeof(struct sqlda)+(n-1)*sizeof(struct sqlvar))

SQL Data Type	C Definitions for Data Types Returned or Set in sqltype and sqlindtype	Value
UNKNOWN	SQL_TYP_UNKNOWN	0
CHAR	SQL_TYP_CHAR	1
NUMERIC	SQL_TYP_NUMERIC	2
DECIMAL	SQL_TYP_DECIMAL	3
INTEGER	SQL_TYP_INTEGER	4
SMALLINT	SQL_TYP_SMALLINT	5
FLOAT	SQL_TYP_FLOAT	6
LARGEINT	SQL_TYP_LARGEINT	9
VARCHAR	SQL_TYP_VARCHAR	12
NUMERIC SIGNED LEADING	SQL_TYP_NUMERIC_LD	20
NUMERIC SIGNED TRAILING	SQL_TYP_NUMERIC_TR	21
NUMERIC SIGNED LEADING SEPARATE	SQL_TYP_NUMERIC_SLD	22
NUMERIC SIGNED LEADING TRAILING	SQL_TYP_NUMERIC_STR	23
NULLABLE_CHAR	SQL_TYP_NCHAR	-1
NULLABLE NUMERIC	SQL_TYP_NNUMERIC	-2
NULLABLE DECIMAL	SQL_TYP_NDECIMAL	-3
NULLABLE INTEGER	SQL_TYP_NINTEGER	-4
NULLABLE SMALLINT	SQL_TYP_NSMALLINT	-5
NULLABLE FLOAT	SQL_TYP_NFLOAT	-6
NULLABLE LARGEINT	SQL_TYP_NLARGEINT	-9
NULLABLE VARCHAR	SQL_TYP_NVARCHAR	-12
NULLABLE NUMERIC SIGNED LEADING	SQL_TYP_NNUMERIC_LD	-20
NULLABLE NUMERIC SIGNED TRAILING	SQL_TYP_NNUMERIC_TR	-21
NULLABLE NUMERIC SIGN LEADING	SQL_TYP_NNUMERIC_SLD	-22
NULLABLE NUMERIC SIGN TRAILING	SQL_TYP_NNUMERIC_STR	-23
BINARY	SQL_TYP_BINARY	-51
NULLABLE BINARY	SQL_TYP_NBINARY	-52
NATURAL DATE	SQL_TYP_NATDATE	-53
NULLABLE NATURAL DATE	SQL_TYP_NNATDATE	-54
NATURAL TIME	SQL_TYP_NATTIME	-55
NULLABLE NATURAL TIME	SQL_TYP_NNATTIME	-56
SQLDA	SQL_TYP_SQLDA	-57
NATURAL TIMESTAMP	SQL_TYP_NATTIMESTAMP	-58
NULLABLE NATURAL TIMESTAMP	SQL_TYP_NNATTIMESTAMP	-59