support call statement & add stat service

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

@@ -0,0 +1,27 @@
+package com.alibaba.druid.bvt.filter.wall;
+
+import junit.framework.TestCase;
+
+import org.junit.Assert;
+
+import com.alibaba.druid.wall.WallUtils;
+
+/**
+ * 这个场景，被攻击者用于测试当前SQL拥有多少字段
+ * @author wenshao
+ *
+ */
+public class WallCallTest extends TestCase {
+
+    public void testMySql() throws Exception {
+        Assert.assertTrue(WallUtils.isValidateMySql("{ call INTERFACE_DATA_EXTRACTION.INVOICE_INFO(?,?,?)}"));
+    }
+    
+    public void testOracle() throws Exception {
+        Assert.assertTrue(WallUtils.isValidateOracle("{ call INTERFACE_DATA_EXTRACTION.INVOICE_INFO(?,?,?)}"));
+    }
+    
+    public void testSqlServer() throws Exception {
+        Assert.assertTrue(WallUtils.isValidateSqlServer("{ call INTERFACE_DATA_EXTRACTION.INVOICE_INFO(?,?,?)}"));
+    }
+}