Mybatis-Plus 实战完整学习笔记(五)------insert测试

一、更新操作探究（3.0.3版本）

demo

 /**
      * 修改用户
      * @throws SQLException
      */
     @Test
     public void update() throws SQLException {

         Employee employee = new Employee();

         employee.setLastName("Marry");
         employee.setAge(12);
         employee.setEmail("marry@163.com");
         employee.setGender(1);

         Integer result = employeeMapper.updateById(employee);

         if (result!=null||result>0) {
             logger.info("++++++++++++++++修改成功+++++");
         }
     }

1、根据Id修改字段内容

  /**
      * 修改用户
      * @throws SQLException
      */
     @Test
     public void update() throws SQLException {

         Employee employee = new Employee();

         employee.setId(1);
         employee.setLastName("Marry");
         employee.setAge(55);
         employee.setEmail("marry@163.com");
         employee.setGender(0);

         Integer result = employeeMapper.updateById(employee);

         if (result!=null||result>0) {
             logger.info("++++++++++++++++修改成功+++++");
         }
     }

2、全表修改一个字段值

  /**
      * 修改用户
      * @throws SQLException
      */
     @Test
     public void update() throws SQLException {

         Employee employee = new Employee();

         employee.setId(1);
         employee.setLastName("Marry");
         employee.setAge(55);
         employee.setGender(0);

         //全表修改一个字段的值
         Integer result = employeeMapper.update(employee,new UpdateWrapper().set("email","marry@163.com"));

         if (result!=null||result>0) {
             logger.info("++++++++++++++++修改成功+++++");
         }
     }

3、判断重复的就修改

  /**
      * 修改用户
      * @throws SQLException
      */
     @Test
     public void update() throws SQLException {

         Employee employee = new Employee();

         employee.setId(1);
         employee.setLastName("Marry");
         employee.setAge(55);
         employee.setEmail("marry@163.com");
         employee.setGender(0);

         // 判断重复的就修改
         // UPDATE tbl_employee SET last_name=?, gender=?, age=? WHERE id=? AND last_name=? AND gender=? AND age=？
         Integer result = employeeMapper.update(employee,new UpdateWrapper().setEntity(employee));

         if (result!=null||result>0) {
             logger.info("++++++++++++++++修改成功+++++");
         }
     }

4、自定义sql语句修改

  /**
      * 修改用户
      * @throws SQLException
      */
     @Test
     public void update() throws SQLException {

         Employee employee = new Employee();

         employee.setId(1);
         employee.setLastName("Marry");
         employee.setAge(55);
         employee.setEmail("marry@163.com");
         employee.setGender(0);

         //拼接一个sql的值
         //UPDATE tbl_employee SET last_name=?, gender=?, age=?, email=1 where email=1 and age=12(注意where前的空格))
         Integer result = employeeMapper.update(employee,new UpdateWrapper().setSql("email="+employee.getId()+" where email=1 and age=12"));

         if (result!=null||result>0) {
             logger.info("++++++++++++++++修改成功+++++");
         }
     }

注意：

2.3版本有

1. 1)  Integer updateById(@Param("et") T entity); 根据ID修改

2. 2)  Integer updateAllColumnById(@Param("et") T entity)  不管是否为空，都会出现在slq语句中。默认未设置的字段设置为空