Issue 937 - fixed ASSERT and added new tests

source/pdo_sqlsrv/pdo_stmt.cpp

@@ -1029,20 +1029,28 @@ int pdo_sqlsrv_stmt_get_col_meta( _Inout_ pdo_stmt_t *stmt, _In_ zend_long colno
 
     try {
         SQLSRV_ASSERT( stmt != NULL, "pdo_sqlsrv_stmt_get_col_meta: pdo_stmt object was null" );
-        SQLSRV_ASSERT( stmt->columns != NULL, "pdo_sqlsrv_stmt_get_col_meta: columns are not available." );
         SQLSRV_ASSERT( Z_TYPE_P( return_value ) == IS_NULL, "Metadata already has value.  Must be NULL." );
 
-        sqlsrv_malloc_auto_ptr<field_meta_data> core_meta_data;
-
         sqlsrv_stmt* driver_stmt = static_cast<sqlsrv_stmt*>( stmt->driver_data );
         SQLSRV_ASSERT( driver_stmt != NULL, "pdo_sqlsrv_stmt_get_col_meta: stmt->driver_data was null");
 
-        SQLSRV_ASSERT( colno >= 0 && colno < stmt->column_count, "pdo_sqlsrv_stmt_get_col_meta: invalid column number." );
+        // Based on PDOStatement::getColumnMeta API, this should return FALSE 
+        // if the requested column does not exist in the result set, or if 
+        // no result set exists. Thus, do not use SQLSRV_ASSERT, which causes 
+        // the script to fail right away. Instead, log this warning if logging
+        // is enabled
+        if (colno < 0 || colno >= stmt->column_count || stmt->columns == NULL) {
+            LOG( SEV_WARNING, "Invalid column number %1!d!", colno );
+            return FAILURE;
+        }
 
-        core_meta_data = core_sqlsrv_field_metadata( driver_stmt, (SQLSMALLINT) colno TSRMLS_CC );
         // initialize the array to nothing, as PDO requires us to create it
         core::sqlsrv_array_init( *driver_stmt, return_value TSRMLS_CC );
 
+        sqlsrv_malloc_auto_ptr<field_meta_data> core_meta_data;
+
+        core_meta_data = core_sqlsrv_field_metadata( driver_stmt, (SQLSMALLINT) colno TSRMLS_CC );
+
         // add the following fields: flags, native_type, driver:decl_type, table
         add_assoc_long( return_value, "flags", 0 );
 

source/sqlsrv/stmt.cpp

@@ -1807,7 +1807,7 @@ SQLSMALLINT get_resultset_meta_data(_Inout_ sqlsrv_stmt * stmt)
         throw;
     }
 
-    SQLSRV_ASSERT(num_cols > 0 && stmt->current_meta_data.size() == num_cols, "Meta data vector out of sync" );
+    SQLSRV_ASSERT(stmt->current_meta_data.size() == num_cols, "Meta data vector out of sync" );
 
     return num_cols;
 }

test/functional/pdo_sqlsrv/pdo_937_metadata.phpt

@@ -0,0 +1,122 @@
+--TEST--
+GitHub issue 937 - getting metadata will not fail after an UPDATE / DELETE statement
+--DESCRIPTION--
+Verifies that getColumnMeta will not fail after processing an UPDATE / DELETE query that returns no fields. Instead, it should simply return FALSE because no result set exists.
+--ENV--
+PHPT_EXEC=true
+--SKIPIF--
+<?php require('skipif_mid-refactor.inc'); ?>
+--FILE--
+<?php
+require_once("MsSetup.inc");
+require_once("MsCommon_mid-refactor.inc");
+
+$tableName = 'pdoTestTable_938';
+$procName = 'pdoTestProc_938';
+
+function checkMetaData($stmt)
+{
+    $metadata = $stmt->getColumnMeta(0);
+    if ($metadata !== FALSE) {
+        echo "Expects FALSE because no result set exists!\n";
+    }
+}
+
+try {
+    $conn = connect();
+
+    dropTable($conn, $tableName);
+    dropProc($conn, $procName);
+
+    $tsql = "CREATE TABLE $tableName([id] [int] NOT NULL, [name] [varchar](10) NOT NULL)";
+    $conn->query($tsql);
+
+    $id = 3;
+    $tsql = "INSERT INTO $tableName VALUES ($id, 'abcde')";
+    $conn->query($tsql);
+
+    $tsql = "UPDATE $tableName SET name = 'updated' WHERE id = $id";
+    $stmt = $conn->prepare($tsql);
+    $stmt->execute();
+    $numCol = $metadata = $stmt->columnCount();
+    echo "Number of columns after UPDATE: $numCol\n";
+    checkMetaData($stmt);
+
+    $tsql = "SELECT * FROM $tableName";
+    $stmt = $conn->query($tsql);
+    $numCol = $metadata = $stmt->columnCount();
+    for ($i = 0; $i < $numCol; $i++) {
+        $metadata = $stmt->getColumnMeta($i);
+        var_dump($metadata);
+    }
+
+    createProc($conn, $procName, "@id int, @val varchar(10) OUTPUT", "SELECT @val = name FROM $tableName WHERE id = @id");
+
+    $value = '';
+    $tsql = "{CALL [$procName] (?, ?)}";
+    $stmt = $conn->prepare($tsql);
+    $stmt->bindParam(1, $id, PDO::PARAM_INT);
+    $stmt->bindParam(2, $value, PDO::PARAM_STR, 10);
+    $stmt->execute();
+    $numCol = $metadata = $stmt->columnCount();
+    echo "Number of columns after PROCEDURE: $numCol\n";
+    echo "Value returned: $value\n";
+    checkMetaData($stmt);
+
+    $query = "DELETE FROM $tableName WHERE name = 'updated'";
+    $stmt = $conn->query($query);  
+    $numCol = $metadata = $stmt->columnCount();
+    echo "Number of columns after DELETE: $numCol\n";
+    checkMetaData($stmt);
+} catch (PDOException $e) {
+    echo $e->getMessage() . PHP_EOL;
+}
+
+dropTable($conn, $tableName);
+dropProc($conn, $procName);
+
+unset($stmt);
+unset($conn);
+
+?>
+--EXPECT--
+Number of columns after UPDATE: 0
+array(8) {
+  ["flags"]=>
+  int(0)
+  ["sqlsrv:decl_type"]=>
+  string(3) "int"
+  ["native_type"]=>
+  string(6) "string"
+  ["table"]=>
+  string(0) ""
+  ["pdo_type"]=>
+  int(2)
+  ["name"]=>
+  string(2) "id"
+  ["len"]=>
+  int(10)
+  ["precision"]=>
+  int(0)
+}
+array(8) {
+  ["flags"]=>
+  int(0)
+  ["sqlsrv:decl_type"]=>
+  string(7) "varchar"
+  ["native_type"]=>
+  string(6) "string"
+  ["table"]=>
+  string(0) ""
+  ["pdo_type"]=>
+  int(2)
+  ["name"]=>
+  string(4) "name"
+  ["len"]=>
+  int(10)
+  ["precision"]=>
+  int(0)
+}
+Number of columns after PROCEDURE: 0
+Value returned: updated
+Number of columns after DELETE: 0

test/functional/pdo_sqlsrv/pdostatement_getColumnMeta.phpt

@@ -220,5 +220,4 @@ array(7) {
 
 Warning: PDOStatement::getColumnMeta(): SQLSTATE[42P10]: Invalid column reference: column number must be non-negative in %s on line %x
 bool(false)
-
-Fatal error: pdo_sqlsrv_stmt_get_col_meta: invalid column number. in %s on line %x
+bool(false)

test/functional/pdo_sqlsrv/pdostatement_getColumnMeta_unicode_col_name.phpt

@@ -259,5 +259,4 @@ array(7) {
 
 Warning: PDOStatement::getColumnMeta(): SQLSTATE[42P10]: Invalid column reference: column number must be non-negative in %s on line %x
 bool(false)
-
-Fatal error: pdo_sqlsrv_stmt_get_col_meta: invalid column number. in %s on line %x
+bool(false)

test/functional/sqlsrv/srv_937_metadata.phpt

@@ -0,0 +1,125 @@
+--TEST--
+GitHub issue #937 - getting metadata will not fail after an UPDATE / DELETE statement
+--DESCRIPTION--
+Verifies that sqlsrv_field_metadata will return an empty array after processing an 
+UPDATE / DELETE query that returns no fields.
+--ENV--
+PHPT_EXEC=true
+--SKIPIF--
+<?php require('skipif.inc'); ?>
+--FILE--
+<?php
+require_once('MsCommon.inc');
+
+$conn = connect();
+if ($conn === false) {
+    die(print_r(sqlsrv_errors(), true));
+}
+
+$tableName = 'srvTestTable_938';
+$procName = 'srvTestProc_938';
+
+dropTable($conn, $tableName);
+dropProc($conn, $procName);
+
+// Create the test table
+$tsql = "CREATE TABLE $tableName([id] [int] NOT NULL, 
+                                 [dummyColumn] [varchar](10) NOT NULL
+                                )";
+$stmt = sqlsrv_query($conn, $tsql);
+if (!$stmt) {
+    fatalError("Failed to create table $tableName\n");
+}
+
+$id = 5;
+$tsql = "INSERT INTO $tableName VALUES ($id, 'dummy')";
+$stmt = sqlsrv_query($conn, $tsql);
+if (!$stmt) {
+    fatalError("Failed to insert a row into table $tableName\n");
+}
+
+$tsql = "SELECT * FROM $tableName";
+$stmt = sqlsrv_query($conn, $tsql);
+$fieldmeta = sqlsrv_field_metadata($stmt);
+var_dump($fieldmeta);
+
+$tsql = "UPDATE $tableName SET dummyColumn = 'updated' WHERE id = $id";
+$stmt = sqlsrv_prepare($conn, $tsql);
+sqlsrv_execute($stmt);
+$fieldmeta = sqlsrv_field_metadata($stmt);
+var_dump($fieldmeta);
+
+createProc($conn, $procName, "@id int, @val varchar(10) OUTPUT", "SELECT @val = dummyColumn FROM $tableName WHERE id = @id");
+
+$value = '';
+$tsql = "{CALL [$procName] (?, ?)}";
+$stmt = sqlsrv_prepare(
+    $conn,
+    $tsql,
+    array(array($id, SQLSRV_PARAM_IN),
+                             array(&$value, SQLSRV_PARAM_OUT)
+                            )
+                       );
+$result = sqlsrv_execute($stmt);
+if (!$result) {
+    fatalError("Failed to invoke stored procedure $procName\n");
+}
+
+echo "The value returned: $value\n";
+
+$fieldmeta = sqlsrv_field_metadata($stmt);
+var_dump($fieldmeta);
+
+$options = array("Scrollable" => "buffered");
+$tsql = "DELETE FROM $tableName WHERE dummyColumn = 'updated'";
+$stmt = sqlsrv_query($conn, $tsql, array(), $options);
+$fieldmeta = sqlsrv_field_metadata($stmt);
+var_dump($fieldmeta);
+
+dropTable($conn, $tableName);
+dropProc($conn, $procName);
+
+sqlsrv_free_stmt($stmt);
+sqlsrv_close($conn);
+
+?>
+--EXPECT--
+array(2) {
+  [0]=>
+  array(6) {
+    ["Name"]=>
+    string(2) "id"
+    ["Type"]=>
+    int(4)
+    ["Size"]=>
+    NULL
+    ["Precision"]=>
+    int(10)
+    ["Scale"]=>
+    NULL
+    ["Nullable"]=>
+    int(0)
+  }
+  [1]=>
+  array(6) {
+    ["Name"]=>
+    string(11) "dummyColumn"
+    ["Type"]=>
+    int(12)
+    ["Size"]=>
+    int(10)
+    ["Precision"]=>
+    NULL
+    ["Scale"]=>
+    NULL
+    ["Nullable"]=>
+    int(0)
+  }
+}
+array(0) {
+}
+The value returned: updated
+array(0) {
+}
+array(0) {
+}