add sql wall support

src/test/java/com/alibaba/druid/bvt/filter/wall/OracleWallTest.java

@@ -0,0 +1,16 @@
+package com.alibaba.druid.bvt.filter.wall;
+
+import junit.framework.TestCase;
+
+import org.junit.Assert;
+
+import com.alibaba.druid.filter.wall.WallUtils;
+
+public class OracleWallTest extends TestCase {
+
+    public void testWall() throws Exception {
+        Assert.assertFalse(WallUtils.isValidateOracle("select f1, f2 from t union select 1, 2"));
+        
+        Assert.assertFalse(WallUtils.isValidateOracle("select * from TAB"));
+    }
+}

src/test/java/com/alibaba/druid/sql/OnlineOracleTest3.java

@@ -33,7 +33,7 @@ public class OnlineOracleTest3 extends TestCase {
     }
 
     public void test_connect() throws Exception {
-        execute("select * from session_roles");
+        executeQuery("select * from TAB");
     }
 
     public void executeQuery(String sql) throws SQLException {