19.7.3 a_rdb_SQLDataType_t structure (data type information)
- Organization of this subsection
(1) Function
The following information is stored in a_rdb_SQLDataType_t structures:
-
Information about the data types of the retrieval result columns acquired by a_rdb_SQLDescribeCols()
-
Information about the data types of dynamic parameters acquired by a_rdb_SQLDescribeParams()
For details about a_rdb_SQLDescribeCols(), see 19.4.6 a_rdb_SQLDescribeCols() (acquire information about the retrieval result columns). For details about a_rdb_SQLDescribeParams(), see 19.4.7 a_rdb_SQLDescribeParams() (acquire dynamic parameter information).
(2) Format
typedef struct a_rdb_TG_DataType {
signed int DataType ; /* Out */
unsigned short ElementCount ; /* Out */
char _DataType_rsv01[2] ;
unsigned int DataLength1 ; /* Out */
unsigned int DataLength2 ; /* Out */
char _DataType_rsv02[16] ;
} a_rdb_SQLDataType_t ;
(3) Members
- DataType
-
Stores a data type code.
- ElementCount
-
Stores information about the data structure.
A value of 1 is stored.
- DataLength1
-
If a_rdb_SQLDescribeCols() is executed, the column length is acquired. If a_rdb_SQLDescribeParams() is executed, the parameter length is acquired.
For details about the value to be specified, see 19.4.6 a_rdb_SQLDescribeCols() (acquire information about the retrieval result columns) or 19.4.7 a_rdb_SQLDescribeParams() (acquire dynamic parameter information).
- DataLength2
-
If a_rdb_SQLDescribeCols() is executed, the column length attribute is acquired. If a_rdb_SQLDescribeParams() is executed, the parameter length attribute is acquired.
For details, see 19.4.6 a_rdb_SQLDescribeCols() (acquire information about the retrieval result columns) and 19.4.7 a_rdb_SQLDescribeParams() (acquire dynamic parameter information).
(4) Notes
When you use an a_rdb_SQLDataType_t structure, make sure that you first initialize the area to all zeros, and then specify a value for each member to be used.