SQLGetData

Function

SQLGetData is used to retrieve data for a single column in the result set. It can be called for many times to retrieve data of variable lengths.

Prototype

    
         SQLRETURN SQLGetData(SQLHSTMT        StatementHandle,
                     SQLUSMALLINT    Col_or_Param_Num,
                     SQLSMALLINT     TargetType,
                     SQLPOINTER      TargetValuePtr,
                     SQLLEN          BufferLength,
                     SQLLEN          *StrLen_or_IndPtr);

Parameter

**Table 1** SQLGetData parameters
Keyword	Parameter Description
StatementHandle	Statement handle, obtained from SQLAllocHandle.
Col_or_Param_Num	Column number for which the data retrieval is requested. The column number starts with 1 and increases in ascending order. The number of the bookmark column is 0.
TargetType	C data type in the TargetValuePtr buffer. If TargetType is SQL_ARD_TYPE, the driver uses the data type of the SQL_DESC_CONCISE_TYPE field in ARD. If TargetType is SQL_C_DEFAULT, the driver selects a default data type according to the source SQL data type.
TargetValuePtr	Output parameter: pointer to the pointer that points to the buffer where the data is located.
BufferLength	Size of the TargetValuePtr buffer.
StrLen_or_IndPtr	Output parameter: pointer to the buffer where the length or identifier value is returned.

Return Value

SQL_SUCCESS indicates that the call succeeded.
SQL_SUCCESS_WITH_INFO indicates that some warning information is displayed.
SQL_ERROR indicates major errors, such as memory allocation and connection failures.
SQL_NO_DATA indicates that the SQL statement does not return a result set.
SQL_INVALID_HANDLE indicates that invalid handles were called. This value may also be returned by other APIs.
SQL_STILL_EXECUTING indicates that the statement is being executed.

Precautions

If SQLGetData returns SQL_ERROR or SQL_SUCCESS_WITH_INFO, the application can call SQLGetDiagRec, with HandleType and Handle set to SQL_HANDLE_STMT and StatementHandle, respectively, to obtain the SQLSTATE value. The SQLSTATE value provides the detailed function calling information.