sqlcolattributes.c

来自「这个是内存数据库的客户端」· C语言 代码 · 共 147 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.
 */

/**********************************************************************
 * SQLColAttributes()
 * CLI Compliance: deprecated in ODBC 3.0 (replaced by SQLColAttribute())
 * Provided here for old (pre ODBC 3.0) applications and driver managers.
 **********************************************************************/

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

static SQLRETURN
SQLColAttributes_(ODBCStmt *stmt, SQLUSMALLINT nCol, SQLUSMALLINT nDescType, SQLPOINTER pszDesc, SQLSMALLINT nDescMax, SQLSMALLINT *pcbDesc, SQLINTEGER *pfDesc)
{
	SQLRETURN rc;
	SQLINTEGER value;

	/* use mapping as described in ODBC 3 SDK Help file */
	switch (nDescType) {
	case SQL_COLUMN_NAME:
		nDescType = SQL_DESC_NAME;
		break;
	case SQL_COLUMN_NULLABLE:
		nDescType = SQL_DESC_NULLABLE;
		break;
	case SQL_COLUMN_COUNT:
		nDescType = SQL_DESC_COUNT;
		break;
	}
	rc = SQLColAttribute_(stmt, nCol, nDescType, pszDesc, nDescMax, pcbDesc, &value);

	/* TODO: implement specials semantics for nDescTypes: SQL_COLUMN_TYPE,
	   SQL_COLUMN_NAME, SQL_COLUMN_NULLABLE and SQL_COLUMN_COUNT.
	   See ODBC 3 SDK Help file, SQLColAttributes Mapping.
	 */
/*
	if (nDescType == SQL_COLUMN_TYPE && value == concise datetime type) {
		map return value for date, time, and timestamp codes;
	}
*/
	if (pfDesc)
		*pfDesc = value;
	return rc;
}

SQLRETURN SQL_API
SQLColAttributes(SQLHSTMT hStmt, SQLUSMALLINT nCol, SQLUSMALLINT nDescType, SQLPOINTER pszDesc, SQLSMALLINT nDescMax, SQLSMALLINT *pcbDesc, SQLINTEGER *pfDesc)
{
	ODBCStmt *stmt = (ODBCStmt *) hStmt;

#ifdef ODBCDEBUG
	ODBCLOG("SQLColAttributes " PTRFMT " %d %d\n", PTRFMTCAST hStmt, nCol, nDescType);
#endif

	if (!isValidStmt(stmt))
		 return SQL_INVALID_HANDLE;

	clearStmtErrors(stmt);

	return SQLColAttributes_(stmt, nCol, nDescType, pszDesc, nDescMax, pcbDesc, pfDesc);
}

#ifdef WITH_WCHAR
SQLRETURN SQL_API
SQLColAttributesA(SQLHSTMT hStmt, SQLUSMALLINT nCol, SQLUSMALLINT nDescType, SQLPOINTER pszDesc, SQLSMALLINT nDescMax, SQLSMALLINT *pcbDesc, SQLINTEGER *pfDesc)
{
	return SQLColAttributes(hStmt, nCol, nDescType, pszDesc, nDescMax, pcbDesc, pfDesc);
}

SQLRETURN SQL_API
SQLColAttributesW(SQLHSTMT hStmt, SQLUSMALLINT nCol, SQLUSMALLINT nDescType, SQLPOINTER pszDesc, SQLSMALLINT nDescMax, SQLSMALLINT *pcbDesc, SQLINTEGER *pfDesc)
{
	ODBCStmt *stmt = (ODBCStmt *) hStmt;
	SQLPOINTER ptr;
	SQLRETURN rc;
	SQLSMALLINT n;

#ifdef ODBCDEBUG
	ODBCLOG("SQLColAttributesW " PTRFMT " %d %d\n", PTRFMTCAST hStmt, nCol, nDescType);
#endif

	if (!isValidStmt(stmt))
		 return SQL_INVALID_HANDLE;

	clearStmtErrors(stmt);

	switch (nDescType) {
		/* all string atributes */
	case SQL_DESC_BASE_COLUMN_NAME:
	case SQL_DESC_BASE_TABLE_NAME:
	case SQL_DESC_CATALOG_NAME:	/* SQL_COLUMN_QUALIFIER_NAME */
	case SQL_DESC_LABEL:	/* SQL_COLUMN_LABEL */
	case SQL_DESC_LITERAL_PREFIX:
	case SQL_DESC_LITERAL_SUFFIX:
	case SQL_DESC_LOCAL_TYPE_NAME:
	case SQL_DESC_NAME:
	case SQL_DESC_SCHEMA_NAME:	/* SQL_COLUMN_OWNER_NAME */
	case SQL_DESC_TABLE_NAME:	/* SQL_COLUMN_TABLE_NAME */
	case SQL_DESC_TYPE_NAME:	/* SQL_COLUMN_TYPE_NAME */
		n = nDescMax * 4;
		ptr = (SQLPOINTER) malloc(n);
		break;
	default:
		n = nDescMax;
		ptr = pszDesc;
		break;
	}

	rc = SQLColAttributes_(stmt, nCol, nDescType, ptr, n, &n, pfDesc);

	if (ptr !=pszDesc)
		fixWcharOut(rc, ptr, n, pszDesc, nDescMax, pcbDesc, 2, addStmtError, stmt);

	else if (pcbDesc)
		*pcbDesc = n;

	return rc;
}
#endif /* WITH_WCHAR */