workaround for unixODBC bug returning error when pdo::exec query with empty result set

source/shared/core_sqlsrv.h

@@ -2040,6 +2040,17 @@ namespace core {
         SQLRETURN r;
         SQLSMALLINT num_cols;
         r = ::SQLNumResultCols( stmt->handle(), &num_cols );
+
+		// Workaround for a bug in unixODBC: after SQLExecDirect for an empty result set,
+		// r = ::SQLNumResultCols( stmt->handle(), &num_cols );  
+		// returns r=-1 (SQL_ERROR) and error HY010 (Function sequence error)
+		// but it should have succeeded with r=0 (SQL_SUCCESS) and no error
+		// instead of throwing an exception, return 0 if the r=-1, stament has been executed, and has a HY010 error
+		// (HY010 error should not return if stmt->execute is true)
+#ifndef _WIN32
+		if ( r == -1 && stmt->execute && strcmp( reinterpret_cast<const char*>( stmt->last_error()->sqlstate ), "HY010" ) == 0 )
+			return 0;
+#endif // !_WIN32
         
         CHECK_SQL_ERROR_OR_WARNING( r, stmt ) {
             throw CoreException();

test/pdo_sqlsrv/pdo_336_pho_exec_empty_result_set_error.phpt

@@ -0,0 +1,53 @@
+--TEST--
+GitHub issue #336 - PDO::exec should not return an error with query returning SQL_NO_DATA
+--DESCRIPTION--
+Verifies GitHub issue 336 is fixed, PDO::exec on query returning SQL_NO_DATA will not give an error
+--SKIPIF--
+--FILE--
+<?php
+require_once("pdo_tools.inc");
+
+// Connect 
+require_once("autonomous_setup.php");
+
+$dbName = "tempdb";
+
+$conn = new PDO("sqlsrv:server=$serverName;Database=$dbName", $username, $password);   
+$conn->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );   
+
+$sql = "DELETE FROM foo_table WHERE id = 42";
+$sqlWithParameter = "DELETE FROM foo_table WHERE id = :id";
+$sqlParameter = 42;
+
+$Statement = $conn->exec("IF OBJECT_ID('foo_table', 'U') IS NOT NULL DROP TABLE foo_table");
+$Statement = $conn->exec("CREATE TABLE foo_table (id BIGINT PRIMARY KEY NOT NULL IDENTITY, intField INT NOT NULL)");
+$Statement = $conn->exec("INSERT INTO foo_table (intField) VALUES(3)");
+
+//test prepare, not args
+$stmt = $conn->prepare($sql);
+$stmt->execute();
+if ($conn->errorCode() == 00000)
+    echo "prepare OK\n";
+
+//test prepare, with args
+$stmt = $conn->prepare($sqlWithParameter);
+$stmt->execute(array(':id' => $sqlParameter));
+if ($conn->errorCode() == 00000)
+    echo "prepare with args OK\n";
+
+//test direct exec
+$stmt = $conn->exec($sql);
+if ($conn->errorCode() == 00000)
+    echo "direct exec OK\n";
+
+$Statement = $conn->exec("IF OBJECT_ID('foo_table', 'U') IS NOT NULL DROP TABLE foo_table");
+
+$stmt = NULL;
+$Statement = NULL;
+$conn = NULL;
+
+?>
+--EXPECT--
+prepare OK
+prepare with args OK
+direct exec OK