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