bug fixed resultSet null

src/test/java/com/alibaba/druid/bvt/bug/Bug_for_xuershan.java

@@ -0,0 +1,45 @@
+package com.alibaba.druid.bvt.bug;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+
+import junit.framework.Assert;
+import junit.framework.TestCase;
+
+import com.alibaba.druid.mock.MockDriver;
+import com.alibaba.druid.mock.MockPreparedStatement;
+import com.alibaba.druid.pool.DruidDataSource;
+import com.alibaba.druid.util.JdbcUtils;
+
+public class Bug_for_xuershan extends TestCase {
+
+    private DruidDataSource dataSource;
+    private MockDriver      driver;
+
+    protected void setUp() throws Exception {
+        driver = new MockDriver() {
+            protected ResultSet createResultSet(MockPreparedStatement stmt) {
+                return null;
+            }
+        };
+        
+        dataSource = new DruidDataSource();
+        dataSource.setUrl("jdbc:mock:xx");
+        dataSource.setDriver(driver);
+    }
+    
+    protected void tearDown() throws Exception {
+        JdbcUtils.close(dataSource);
+    }
+
+    public void test_bug_for_xuershan() throws Exception {
+        String sql = "select 1";
+        Connection conn = dataSource.getConnection();
+        PreparedStatement stmt = conn.prepareStatement(sql);
+        stmt.execute();
+        Assert.assertNull(stmt.getResultSet());
+        stmt.close();
+        conn.close();
+    }
+}