content: package com.alibaba.druid;
  
  import com.alibaba.druid.pool.DruidDataSource;
  import com.mchange.v2.c3p0.ComboPooledDataSource;
  import org.junit.AfterClass;
  import org.junit.Assert;
  import org.junit.Before;
  import org.junit.BeforeClass;
  import org.junit.Test;
  import org.nutz.dao.Chain;
  import org.nutz.dao.Cnd;
  import org.nutz.dao.Dao;
  import org.nutz.dao.Sqls;
  import org.nutz.dao.impl.NutDao;
  import org.nutz.trans.Atom;
  import org.nutz.trans.Trans;
  
  import java.beans.PropertyVetoException;
  import java.sql.SQLException;
  
  /*
   * Copyright 1999-2018 Alibaba Group Holding Ltd.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  public class TestRollBack {
      static ComboPooledDataSource c3p0;
      static DruidDataSource druid;
      static Dao dao_c3p0;
      static Dao dao_druid;
  
  //    static String url = "jdbc:oracle:thin:@a.b.c.d:1521:ocnauto";
  //    static String user = "alibaba";
  //    static String password = "ccbuauto";
  //    static String driver = "oracle.jdbc.driver.OracleDriver";
  
      static String url = "jdbc:jtds:sqlserver://a.b.c.d:1433/druid_db";
      static String user = "sa";
      static String password = "hello123";
      static String driver = "net.sourceforge.jtds.jdbc.Driver";
  
  //  jdbcUrl = "jdbc:oracle:thin:@a.b.c.d:1521:ocnauto";
  //  user = "alibaba";
  //  password = "ccbuauto";
  
      @BeforeClass
      public static void init() throws PropertyVetoException, SQLException {
          c3p0 = new ComboPooledDataSource();
          //c3p0.setDriverClass("oracle.jdbc.driver.OracleDriver");
          c3p0.setDriverClass(driver);
          c3p0.setJdbcUrl(url);
          c3p0.setUser(user);
          c3p0.setPassword(password);
  
          druid = new DruidDataSource();
          druid.setUrl(url);
          druid.setUsername(user);
          druid.setPassword(password);
          druid.setFilters("stat,trace,encoding");
          druid.setDefaultAutoCommit(false);
  
          dao_c3p0 = new NutDao(c3p0);
          dao_druid = new NutDao(druid);
          if (!dao_c3p0.exists("msg")) {
              dao_c3p0.execute(Sqls.create("create table msg(message varchar(5))")); // 字段长度5
          }
      }
  
      @AfterClass
      public static void destroy() {
          c3p0.close();
          druid.close();
      }
  
      @Before
      public void before() {
          // 清空所有数据
          dao_c3p0.clear("msg");
      }
  
      @Test
      public void test_c3p0() {
          try {
              // 将两条插入语句包裹在一个事务内执行,第一条可以正常插入,第二条超过字段长度,会抛异常,事务会回滚
              Trans.exec(new Atom() {
                  @Override
                  public void run() {
                      dao_c3p0.insert("msg", Chain.make("message", "abc"));
                      dao_c3p0.insert("msg", Chain.make("message", "1234567"));
                  }
              });
          } catch (Exception e) {
          }
          // abc也跟着回滚了
          Assert.assertNull(dao_c3p0.fetch("msg", Cnd.where("message", "=", "abc")));
      }
  
      @Test
      public void test_druid() {
          try {
              Trans.exec(new Atom() {
                  @Override
                  public void run() {
                      dao_druid.insert("msg", Chain.make("message", "abc"));
                      dao_druid.insert("msg", Chain.make("message", "1234567"));
                  }
              });
          } catch (Exception e) {
              // e.printStackTrace(); // 把这里的异常打印出来
          }
          // abc插了进去,没有回滚
          Assert.assertNotNull(dao_druid.fetch("msg", Cnd.where("message", "=", "abc")));
      }
  }
  