SQLColAttribute

Function

SQLColAttribute is used to return the descriptor information about a column in the result set.

Prototype

SQLRETURN SQLColAttibute(SQLHSTMT        StatementHandle,    
                         SQLUSMALLINT    ColumnNumber,     
                         SQLUSMALLINT    FieldIdentifier,
                         SQLPOINTER      CharacterAtrriburePtr,
                         SQLSMALLINT     BufferLength,
                         SQLSMALLINT     *StringLengthPtr,
                         SQLLEN       *NumericAttributePtr);

Parameters

Table 1 SQLColAttribute parameters

Keyword

Parameter Description

StatementHandle

Statement handle.

ColumnNumber

Column number of the field to be queried, starting with 1 and increasing in ascending order.

FieldIdentifier

Field identifier of ColumnNumber in IRD.

CharacterAttributePtr

Output parameter: pointer to the buffer that returns the FieldIdentifier value.

BufferLength

  • BufferLength indicates the length of the buffer if FieldIdentifier is an ODBC-defined field and CharacterAttributePtr points to a string or a binary buffer.
  • Ignore this parameter if FieldIdentifier is an ODBC-defined field and CharacterAttributePtr points to an integer.

StringLengthPtr

Output parameter: pointer to a buffer in which the total number of valid bytes (for string data) is stored in *CharacterAttributePtr. Ignore the value of BufferLength if the data is not a string.

NumericAttributePtr

Output parameter: pointer to an integer buffer in which the value of FieldIdentifier in the ColumnNumber row of the IRD 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_INVALID_HANDLE indicates that invalid handles were called. This value may also be returned by other APIs.

Precautions

If SQLColAttribute 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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