sqldescribeparam.c

来自「这个是内存数据库的客户端」· C语言 代码 · 共 110 行

/*
 * The contents of this file are subject to the MonetDB Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://monetdb.cwi.nl/Legal/MonetDBLicense-1.1.html
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
 * License for the specific language governing rights and limitations
 * under the License.
 *
 * The Original Code is the MonetDB Database System.
 *
 * The Initial Developer of the Original Code is CWI.
 * Portions created by CWI are Copyright (C) 1997-2007 CWI.
 * All Rights Reserved.
 */

/*
 * This code was created by Peter Harvey (mostly during Christmas 98/99).
 * This code is LGPL. Please ensure that this message remains in future
 * distributions and uses of this code (thats about all I get out of it).
 * - Peter Harvey [e-mail]
 * 
 * This file has been modified for the MonetDB project.  See the file
 * Copyright in this directory for more information.
 */

/**********************************************************************
 * SQLDescribeParam()
 * CLI Compliance: ODBC (Microsoft)
 *
 * Note: this function is not supported (yet), it returns an error.
 *
 * Author: Martin van Dinther
 * Date  : 30 aug 2002
 *
 **********************************************************************/

#include "ODBCGlobal.h"
#include "ODBCStmt.h"

SQLRETURN SQL_API
SQLDescribeParam(SQLHSTMT hStmt, SQLUSMALLINT nParmNumber, SQLSMALLINT *pnDataType, SQLUINTEGER *pnSize, SQLSMALLINT *pnDecDigits, SQLSMALLINT *pnNullable)
{
	ODBCStmt *stmt = (ODBCStmt *) hStmt;
	ODBCDescRec *rec;

#ifdef ODBCDEBUG
	ODBCLOG("SQLDescribeParam " PTRFMT " %d\n", PTRFMTCAST hStmt, nParmNumber);
#endif

	if (!isValidStmt(stmt))
		 return SQL_INVALID_HANDLE;

	clearStmtErrors(stmt);

	/* check statement cursor state, query should be prepared or executed */
	if (stmt->State == INITED || stmt->State >= EXECUTED0) {
		/* Function sequence error */
		addStmtError(stmt, "HY010", NULL, 0);
		return SQL_ERROR;
	}

	if (nParmNumber < 1 || nParmNumber > stmt->ImplRowDescr->sql_desc_count) {
		/* Invalid descriptor index */
		addStmtError(stmt, "07009", NULL, 0);
		return SQL_ERROR;
	}

	rec = &stmt->ImplRowDescr->descRec[nParmNumber];

	if (pnDataType)
		*pnDataType = rec->sql_desc_concise_type;

	if (pnNullable)
		*pnNullable = rec->sql_desc_nullable;

	/* also see SQLDescribeCol */
	if (pnSize)
		*pnSize = ODBCDisplaySize(rec);

	/* also see SQLDescribeCol */
	if (pnDecDigits) {
		switch (rec->sql_desc_concise_type) {
		case SQL_DECIMAL:
		case SQL_NUMERIC:
			*pnDecDigits = rec->sql_desc_scale;
			break;
		case SQL_BIT:
		case SQL_TINYINT:
		case SQL_SMALLINT:
		case SQL_INTEGER:
		case SQL_BIGINT:
			*pnDecDigits = 0;
			break;
		case SQL_TYPE_TIME:
		case SQL_TYPE_TIMESTAMP:
		case SQL_INTERVAL_SECOND:
		case SQL_INTERVAL_DAY_TO_SECOND:
		case SQL_INTERVAL_HOUR_TO_SECOND:
		case SQL_INTERVAL_MINUTE_TO_SECOND:
			*pnDecDigits = rec->sql_desc_precision;
			break;
		}
	}

	return SQL_SUCCESS;
}