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SQLGetCursorName Function

  • Článok

Conformance
Version Introduced: ODBC 1.0 Standards Compliance: ISO 92

Summary
SQLGetCursorName returns the cursor name associated with a specified statement.

Syntax

  
SQLRETURN SQLGetCursorName(  
     SQLHSTMT        StatementHandle,  
     SQLCHAR *       CursorName,  
     SQLSMALLINT     BufferLength,  
     SQLSMALLINT *   NameLengthPtr);

Arguments

StatementHandle
[Input] Statement handle.

CursorName
[Output] Pointer to a buffer in which to return the cursor name.

If CursorName is NULL, NameLengthPtr will still return the total number of characters (excluding the null-termination character for character data) available to return in the buffer pointed to by CursorName.

BufferLength
[Input] Length of *CursorName, in characters.

NameLengthPtr
[Output] Pointer to memory in which to return the total number of characters (excluding the null-termination character) available to return in *CursorName. If the number of characters available to return is greater than or equal to BufferLength, the cursor name in *CursorName is truncated to BufferLength minus the length of a null-termination character.

Returns

SQL_SUCCESS, SQL_SUCCESS_WITH_INFO, SQL_ERROR, or SQL_INVALID_HANDLE.

Diagnostics

When SQLGetCursorName returns either SQL_ERROR or SQL_SUCCESS_WITH_INFO, an associated SQLSTATE value can be obtained by calling SQLGetDiagRec with a HandleType of SQL_HANDLE_STMT and a Handle of StatementHandle. The following table lists the SQLSTATE values commonly returned by SQLGetCursorName and explains each one in the context of this function; the notation "(DM)" precedes the descriptions of SQLSTATEs returned by the Driver Manager. The return code associated with each SQLSTATE value is SQL_ERROR, unless noted otherwise.

SQLSTATE Error Description
01000 General warning Driver-specific informational message. (Function returns SQL_SUCCESS_WITH_INFO.)
01004 String data, right truncated The buffer *CursorName was not large enough to return the entire cursor name, so the cursor name was truncated. The length of the untruncated cursor name is returned in *NameLengthPtr. (Function returns SQL_SUCCESS_WITH_INFO.)
HY000 General error An error occurred for which there was no specific SQLSTATE and for which no implementation-specific SQLSTATE was defined. The error message returned by SQLGetDiagRec in the *MessageText buffer describes the error and its cause.
HY001 Memory allocation error The driver was unable to allocate memory required to support execution or completion of the function.
HY010 Function sequence error (DM) An asynchronously executing function was called for the connection handle that is associated with the StatementHandle. This asynchronous function was still executing when the SQLGetCursorName function was called.

(DM) SQLExecute, SQLExecDirect, or SQLMoreResults was called for the StatementHandle and returned SQL_PARAM_DATA_AVAILABLE. This function was called before data was retrieved for all streamed parameters.

(DM) An asynchronously executing function was called for the StatementHandle and was still executing when this function was called.

(DM) SQLExecute, SQLExecDirect, SQLBulkOperations, or SQLSetPos was called for the StatementHandle and returned SQL_NEED_DATA. This function was called before data was sent for all data-at-execution parameters or columns.
HY013 Memory management error The function call could not be processed because the underlying memory objects could not be accessed, possibly because of low memory conditions.
HY015 No cursor name available (DM) The driver was an ODBC 2*.x* driver, there was no open cursor on the statement, and no cursor name had been set with SQLSetCursorName.
HY090 Invalid string or buffer length (DM) The value specified in the argument BufferLength was less than 0.
HY117 Connection is suspended due to unknown transaction state. Only disconnect and read-only functions are allowed. (DM) For more information about suspended state, see SQLEndTran Function.
HYT01 Connection timeout expired The connection timeout period expired before the data source responded to the request. The connection timeout period is set through SQLSetConnectAttr, SQL_ATTR_CONNECTION_TIMEOUT.
IM001 Driver does not support this function (DM) The driver associated with the StatementHandle does not support the function.

Comments

Cursor names are used only in positioned update and delete statements (for example, UPDATE table-name ...WHERE CURRENT OF cursor-name). For more information, see Positioned Update and Delete Statements. If the application does not call SQLSetCursorName to define a cursor name, the driver generates a name. This name begins with the letters SQL_CUR.

Note

In ODBC 2*.x*, when there was no open cursor and no name had been set by a call to SQLSetCursorName, a call to SQLGetCursorName returned SQLSTATE HY015 (No cursor name available). In ODBC 3*.x*, this is no longer true; regardless of when SQLGetCursorName is called, the driver returns the cursor name.

SQLGetCursorName returns the name of a cursor whether or not the name was created explicitly or implicitly. A cursor name is implicitly generated if SQLSetCursorName is not called. SQLSetCursorName can be called to rename a cursor on a statement as long as the cursor is in an allocated or prepared state.

A cursor name that is set either explicitly or implicitly remains set until the StatementHandle with which it is associated is dropped, using SQLFreeHandle with a HandleType of SQL_HANDLE_STMT.

For information about See
Executing a SQL statement SQLExecDirect Function
Executing a prepared SQL statement SQLExecute Function
Preparing a statement for execution SQLPrepare Function
Setting a cursor name SQLSetCursorName Function

See Also

ODBC API Reference
ODBC Header Files