improved wallfilter. support update column check.

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

@@ -0,0 +1,34 @@
+package com.alibaba.druid.bvt.filter.wall;
+
+import com.alibaba.druid.wall.WallCheckResult;
+import com.alibaba.druid.wall.WallConfig;
+import com.alibaba.druid.wall.WallUpdateCheckHandler;
+import com.alibaba.druid.wall.spi.MySqlWallProvider;
+import junit.framework.TestCase;
+
+import java.util.List;
+import java.util.Properties;
+
+/**
+ * Created by wenshao on 13/08/2017.
+ */
+public class WallUpdateCheckTest extends TestCase {
+    private MySqlWallProvider wallProvider = new MySqlWallProvider();
+
+    protected void setUp() throws Exception {
+        Properties properties = new Properties();
+        properties.put("druid.wall.updateCheckColumns", "t_orders.status");
+        wallProvider.getConfig().configFromProperties(properties);
+        wallProvider.getConfig().setUpdateCheckHandler(new WallUpdateCheckHandler() {
+
+            @Override
+            public boolean check(String table, String column, Object setValue, List<Object> filterValues) {
+                return false;
+            }
+        });
+    }
+    public void test_update_check_handler() throws Exception {
+        WallCheckResult result = wallProvider.check("update t_orders set status = 3 where id = 3 and status = 4");
+        assertTrue(result.getViolations().size() > 0);
+    }
+}