Fix ODBC bug for varchars returning with length zero

Author: auroraeosrose

ext/pdo_odbc/odbc_stmt.c

@@ -558,6 +558,24 @@ static int odbc_stmt_describe(pdo_stmt_t *stmt, int colno TSRMLS_DC)
 			sizeof(S->cols[colno].colname)-1, &colnamelen,
 			&S->cols[colno].coltype, &colsize, NULL, NULL);
 
+	/* This fixes a known issue with SQL Server and (max) lengths,
+	may affect others as well.  If we are SQL_VARCHAR,
+	SQL_VARBINARY, or SQL_WVARCHAR (or any of the long variations)
+	and zero is returned from colsize then consider it long */
+	if (0 == colsize && 
+		(S->cols[colno].coltype == SQL_VARCHAR ||
+		 S->cols[colno].coltype == SQL_LONGVARCHAR ||
+#ifdef SQL_WVARCHAR
+		 S->cols[colno].coltype == SQL_WVARCHAR ||
+#endif
+#ifdef SQL_WLONGVARCHAR
+		 S->cols[colno].coltype == SQL_WLONGVARCHAR ||
+#endif
+		 S->cols[colno].coltype == SQL_VARBINARY ||
+		 S->cols[colno].coltype == SQL_LONGVARBINARY)) {
+			 S->going_long = 1;
+	}
+
 	if (rc != SQL_SUCCESS) {
 		pdo_odbc_stmt_error("SQLDescribeCol");
 		if (rc != SQL_SUCCESS_WITH_INFO) {

ext/pdo_odbc/tests/max_columns.phpt

@@ -0,0 +1,46 @@
+--TEST--
+PDO ODBC varying character with max/no length
+--SKIPIF--
+<?php # vim:ft=php
+if (!extension_loaded('pdo_odbc')) print 'skip not loaded';
+?>
+--FILE--
+<?php
+require 'ext/pdo/tests/pdo_test.inc';
+$db = PDOTest::test_factory('ext/pdo_odbc/tests/common.phpt');
+$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_SILENT);
+
+if (false === $db->exec('CREATE TABLE TEST (id INT NOT NULL PRIMARY KEY, data varchar(max))')) {
+	if (false === $db->exec('CREATE TABLE TEST (id INT NOT NULL PRIMARY KEY, data longtext)')) {
+		if (false === $db->exec('CREATE TABLE TEST (id INT NOT NULL PRIMARY KEY, data CLOB)')) {
+			die("BORK: don't know how to create a long column here:\n" . implode(", ", $db->errorInfo()));
+		}
+	}
+}
+
+$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
+
+$sizes = array(32, 64, 128, 253, 254, 255, 256, 257, 258, 512, 1024, 2048, 3998, 3999, 4000);
+
+$db->beginTransaction();
+$insert = $db->prepare('INSERT INTO TEST VALUES (?, ?)');
+foreach ($sizes as $num) {
+	$insert->execute(array($num, str_repeat('i', $num)));
+}
+$insert = null;
+$db->commit();
+
+foreach ($db->query('SELECT id, data from TEST') as $row) {
+	$expect = str_repeat('i', $row[0]);
+	if (strcmp($expect, $row[1])) {
+		echo "Failed on size $row[id]:\n";
+		printf("Expected %d bytes, got %d\n", strlen($expect), strlen($row['data']));
+		echo bin2hex($expect) . "\n";
+		echo bin2hex($row['data']) . "\n";
+	}
+}
+
+echo "Finished\n";
+
+--EXPECT--
+Finished