mybatis中操作日期实例分析

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        myBatis的sqlmap操作mysql数据库表，不管是查询还是更新，可以和表的字段类型无关，可以是VARCHAR或者TIMESTAMP，而sqlmap中的resultMap对应的jdbcType也可以是TIMESTAMP或者VARCHAR，甚至DTO的属性类型可以是Date类型，也可以是String类型，都不影响实际的操作逻辑。

        验证代码如下：

ScheduledConfigDao.java

package com.bijian.study.dao;

import com.bijian.study.model.ScheduledConfigDTO;

public interface ScheduledConfigDao {

    public ScheduledConfigDTO selectByPrimaryKey(String task_type);

    public int updateByPrimaryKey(ScheduledConfigDTO record);
}

ScheduledConfigDTO.java

package com.bijian.study.model;

import java.util.Date;

public class ScheduledConfigDTO {

    private String task_type;

    private Date exec_time;
    //private String exec_time;

    private Date update_time;

    public String getTask_type() {
        return task_type;
    }

    public void setTask_type(String task_type) {
        this.task_type = task_type;
    }

    public Date getExec_time() {
        return exec_time;
    }

    public void setExec_time(Date exec_time) {
        this.exec_time = exec_time;
    }

//    public String getExec_time() {
//        return exec_time;
//    }
//
//    public void setExec_time(String exec_time) {
//        this.exec_time = exec_time;
//    }

    public Date getUpdate_time() {
        return update_time;
    }

    public void setUpdate_time(Date update_time) {
        this.update_time = update_time;
    }

    @Override
    public String toString() {
        return "CoreScheduledConfigDTO [task_type=" + task_type + ", exec_time=" + exec_time + ", update_time="
                + update_time + "]";
    }
}

ScheduledConfigDaoMapper.xml

	
		
		
		
	
	
	
		task_type,exec_time,update_time
	
	
	
		select 
		 
		from scheduled_config where task_type = #{task_type,jdbcType=INTEGER}
		 for update
	
	
	
		update scheduled_config 
		
			
				exec_time = #{exec_time,jdbcType=TIMESTAMP},
			
			
				update_time = #{update_time,jdbcType=TIMESTAMP},
			
		
		where task_type = #{task_type,jdbcType=VARCHAR}
	

MyBatisBasicTest.java

package com.bijian.study.test;

import java.io.IOException;
import java.io.Reader;
import java.util.Date;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.BeforeClass;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.bijian.study.dao.ScheduledConfigDao;
import com.bijian.study.model.ScheduledConfigDTO;

public class MyBatisBasicTest {

    private static final Logger log = LoggerFactory.getLogger(MyBatisBasicTest.class);
    private static SqlSessionFactory sqlSessionFactory;

    private static Reader reader;

    @BeforeClass
    public static void initial() {
        try {
            reader = Resources.getResourceAsReader("Configuration.xml");
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
        } catch (IOException e) {
            log.error("Error thrown while reading the configuration: {}", e);
        } finally {
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e) {
                    log.error("Error thrown while closing the reader: {}", e);
                }
            }
        }
    }
    
    @Test
    public void queryInInterfaceWayTest() {
        
        SqlSession session = sqlSessionFactory.openSession();
        ScheduledConfigDao scheduledConfigDao = session.getMapper(ScheduledConfigDao.class);
        ScheduledConfigDTO scheduledConfigDTO = scheduledConfigDao.selectByPrimaryKey("02");
        //ScheduledConfigDTO scheduledConfigDTO = scheduledConfigDao.selectByPrimaryKey("1");
        log.info("scheduledConfigDTO:{}", scheduledConfigDTO);
        
        //scheduledConfigDTO.setExec_time("2016-11-08 10:01:01");
        //scheduledConfigDTO.setExec_time("20161108100112");
        //scheduledConfigDTO.setExec_time(new Date());
        
        scheduledConfigDTO.setExec_time(null);
        scheduledConfigDTO.setUpdate_time(new Date());
        log.info("scheduledConfigDTO:{}", scheduledConfigDTO);
        int count = scheduledConfigDao.updateByPrimaryKey(scheduledConfigDTO);
        session.commit();
        log.info("{}", count);
    }
}

Configuration.xml

mysql.sql

-- Create the database named 'hbatis'.
-- It's OK to use `, not OK to use ' or " surrounding the database name to prevent it from being interpreted as a keyword if possible.
CREATE DATABASE IF NOT EXISTS `hbatis`
DEFAULT CHARACTER SET = `UTF8`;

-- Create a table named 'User'
DROP TABLE IF EXISTS `scheduled_config`;
CREATE TABLE `scheduled_config` (
  `task_type` varchar(2) NOT NULL COMMENT '任务类型',
  `exec_time` varchar(20) DEFAULT NULL COMMENT '上次执行时间',
  `update_time` timestamp NULL DEFAULT NULL COMMENT '修改时间',
  PRIMARY KEY (`task_type`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

-- Insert a test record
Insert INTO `scheduled_config` VALUES ('1', '20161108101751', '2016-11-08 10:17:51');
Insert INTO `scheduled_config` VALUES ('02', '2016-11-08 00:01:02', '2016-11-08 10:17:51');

-- drop table
drop table `scheduled_config`;

mysql2.sql

-- Create the database named 'hbatis'.
-- It's OK to use `, not OK to use ' or " surrounding the database name to prevent it from being interpreted as a keyword if possible.
CREATE DATABASE IF NOT EXISTS `hbatis`
DEFAULT CHARACTER SET = `UTF8`;

-- Create a table named 'User'
DROP TABLE IF EXISTS `scheduled_config`;
CREATE TABLE `scheduled_config` (
  `task_type` varchar(2) NOT NULL COMMENT '任务类型',
  `exec_time` timestamp NULL DEFAULT NULL COMMENT '上次执行时间',
  `update_time` timestamp NULL DEFAULT NULL COMMENT '修改时间',
  PRIMARY KEY (`task_type`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

-- Insert a test record
Insert INTO `scheduled_config` VALUES ('1', '20161108101751', '2016-11-08 10:17:51');
Insert INTO `scheduled_config` VALUES ('02', '2016-11-08 00:01:02', '2016-11-08 10:17:51');

-- drop table
drop table `scheduled_config`;

/*
查数据表如下所示:
mysql>  select * from core_scheduled_config;
+-----------+---------------------+---------------------+
| task_type | exec_time           | update_time         |
+-----------+---------------------+---------------------+
| 02        | 2016-11-08 00:01:02 | 2016-11-08 10:17:51 |
| 1         | 2016-11-08 10:17:51 | 2016-11-08 10:17:51 |
+-----------+---------------------+---------------------+
2 rows in set (0.01 sec)
*/

mysql3.sql

-- Create the database named 'hbatis'.
-- It's OK to use `, not OK to use ' or " surrounding the database name to prevent it from being interpreted as a keyword if possible.
CREATE DATABASE IF NOT EXISTS `hbatis`
DEFAULT CHARACTER SET = `UTF8`;

-- Create a table named 'User'
DROP TABLE IF EXISTS `scheduled_config`;
CREATE TABLE `scheduled_config` (
  `task_type` varchar(2) NOT NULL COMMENT '任务类型',
  -- `exec_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '上次执行时间',
  `exec_time` timestamp NOT NULL COMMENT '上次执行时间',
  `update_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '最后一次修改时间',
  PRIMARY KEY (`task_type`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

-- Insert a test record
Insert INTO `scheduled_config` VALUES ('1', '20161108101751', '2016-11-08 10:17:51');
Insert INTO `scheduled_config` VALUES ('02', '2016-11-08 00:01:02', '2016-11-08 10:17:51');

-- drop table
drop table `scheduled_config`;

        唯一需要注意的是：如果数据库表是TIMESTAMP类型的，初始化语句字段内容为20161108101751，也会转换为2016-11-08 10:17:51TIMESTAMP类型。

 

附：MySQL数据表字段为timestamp类型的坑

        当使用MYSQL,建表使用timestamp类型时,没有默认default CURRENT_TIME，会导致创建的timestamp默认加上default CURRNET_TIME ON UPDATE CURRENT_TIMESTAMP，解决方法：

1.修改字段类型为datetime类型（如果允许允许）

2.更改表的ddl，给timestamp加上default CURRENT_TIMESTAMP

分析实例参考文章：http://bijian1013.iteye.com/blog/2313380

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