improve LogFilter

src/test/java/com/alibaba/druid/benckmark/pool/Case1.java

@@ -59,7 +59,7 @@ public class Case1 extends TestCase {
     private String            validationQuery  = "SELECT 1";
     private int               threadCount      = 5;
     private int               loopCount        = 10;
-    final int                 LOOP_COUNT       = 1000 * 1000 * 1 / threadCount;
+    final int                 LOOP_COUNT       = 1000 * 1 * 1 / threadCount;
 
     private static AtomicLong physicalConnStat = new AtomicLong();
 

src/test/java/com/alibaba/druid/bvt/filter/log/LogFilterTest3.java

@@ -0,0 +1,44 @@
+package com.alibaba.druid.bvt.filter.log;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+
+import junit.framework.TestCase;
+
+import com.alibaba.druid.pool.DruidDataSource;
+import com.alibaba.druid.util.JdbcUtils;
+
+public class LogFilterTest3 extends TestCase {
+
+    private DruidDataSource dataSource;
+
+    protected void setUp() throws Exception {
+        System.setProperty("druid.log.stmt.executableSql", "true");
+        dataSource = new DruidDataSource();
+        dataSource.setUrl("jdbc:derby:classpath:petstore-db");
+        dataSource.setFilters("log4j");
+    }
+    
+    public void test_select() throws Exception {
+        Connection conn = dataSource.getConnection();
+        
+        PreparedStatement stmt = conn.prepareStatement("SELECT * FROM ITEM WHERE LISTPRICE > ?");
+        stmt.setInt(1, 10);
+        
+        for (int i = 0; i < 10; ++i) {
+            ResultSet rs = stmt.executeQuery();
+            rs.close();
+        }
+        
+        stmt.close();
+        
+        conn.close();
+    }
+
+    protected void tearDown() throws Exception {
+        JdbcUtils.close(dataSource);
+        
+        System.clearProperty("druid.log.stmt.executableSql");
+    }
+}