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 buffer pointed to by TargetValuePtr.

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.

Example

See Examples.

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