improve LogFilter

src/test/java/com/alibaba/druid/bvt/filter/log/LogFilterTest.java

@@ -0,0 +1,40 @@
+package com.alibaba.druid.bvt.filter.log;
+
+import java.sql.Connection;
+import java.sql.ResultSet;
+import java.sql.Statement;
+
+import junit.framework.TestCase;
+
+import com.alibaba.druid.pool.DruidDataSource;
+import com.alibaba.druid.util.JdbcUtils;
+
+public class LogFilterTest extends TestCase {
+
+    private DruidDataSource dataSource;
+
+    protected void setUp() throws Exception {
+        dataSource = new DruidDataSource();
+        dataSource.setUrl("jdbc:derby:classpath:petstore-db");
+        dataSource.setFilters("log4j");
+    }
+    
+    public void test_select() throws Exception {
+        Connection conn = dataSource.getConnection();
+        
+        Statement stmt = conn.createStatement();
+        
+        for (int i = 0; i < 10; ++i) {
+            ResultSet rs = stmt.executeQuery("SELECT * FROM ITEM WHERE LISTPRICE > 10");
+            rs.close();
+        }
+        
+        stmt.close();
+        
+        conn.close();
+    }
+
+    protected void tearDown() throws Exception {
+        JdbcUtils.close(dataSource);
+    }
+}