mybatis 2 -常用数据操作

1、写入数据并获取自增ID

XML配置：

  <!-- 写入数据获取自增ID -->

  <insert id="insertLog"   parameterType="com.mamaguwen.entity.sys_loginlog"  useGeneratedKeys="true" keyProperty="logid">

      insert into  sys_loginlog  (UserName) values  (#{username}) 

  </insert>

测试代码:

@Test

    public void insertLog() {

        sys_loginlog model = new sys_loginlog();

        model.setIslogin(true);

        model.setLoginip("127.0.0.1");

        model.setLogintime(new Date());

        model.setUsername("rhythmk");



        int total = loginlog.insertLog(model);

        System.out.println("影响数据条：" + total);

        System.out.println("ID：" + model.getLogid());

        /*

         * 影响数据条：1 ID：4 

         */



    }

2、更新数据

  <!-- 更新数据 -->

  <update id="updateLog"   parameterType="com.mamaguwen.entity.sys_loginlog">

      update sys_loginlog set username=#{username}

      where LogId=#{logid}

  </update>

    /*

     * 更新数据

     */

    @Test

    public void updateLog() {

        sys_loginlog record = new sys_loginlog();

        record.setLogid(4L);

        record.setUsername("wangkun");

        int total = loginlog.updateLog(record);

        System.out.println("影响数据条：" + total);

    }

3、返回单个字符串对象：

    <!-- -返回单字段内容 -->

   <select id="selectStringByKey"  resultType="String"  >

    select   UserName   from  sys_loginlog

    where LogId = #{logid}

  </select>

    /*

     * 返回当个简单对象

     */

    @Test

    public void selectStringByKey() {

        String record = loginlog.selectStringByKey(4);

        System.out.println("返回的字符串:" + record);

    }

4、返回List对象

<select id="selectLogList"    resultType="com.mamaguwen.entity.sys_loginlog">

       select * from  sys_loginlog

   </select>

    /*

     * 获取所有用户日志

     */

    @Test

    public void selectLogList() {

        List<sys_loginlog> list = loginlog.selectLogList();

        for (sys_loginlog log : list) {

            System.out.println(log.getUsername());

        }

    }

5、返回List<String> 对象

     <select id="selectUserNameList"    resultType="String">

       select UserName from  sys_loginlog

   </select>

    /*

     * 获取所有用户名

     */

    @Test

    public void selectUserNameList() {

        List<String> list = loginlog.selectUserNameList();

        for (String str : list) {

            System.out.println(str);

        }

    }

6、传入单个参数

     <select id="selectLogByKey"   resultType="com.mamaguwen.entity.sys_loginlog">

         select * from  sys_loginlog  Where LogId=#{logid}

     </select>

     

    /*

     * 根据主键获取日志

     */

    @Test

    public void selectLogByKey() {

        sys_loginlog model = loginlog.selectLogByKey(5);



        String str = String.format("id:%d,username:%s", model.getLogid(),

                model.getUsername());

        System.out.println(str);

    }

7、执行存储过程：

    <!-- 执行存储过程 -->

     <select id="callProc"   resultType="String"  >

              <!-- 

                    drop procedure if exists ShowString;

                    CREATE PROCEDURE  ShowString(

                         Str VARCHAR(30)

                    )

                    BEGIN

                     select Str as Item;

                    END;

                    CALL  ShowString('rhythmk')

      -->

         call  ShowString (#{str})

     </select>

/*

     * 执行存储过程

     */

    @Test

    public void callProc() {

        String str = loginlog.callProc("rhytmk");

        System.out.println(str);

    }

8、批量写入数据

  <!-- 批量执行SQL -->

     <!--  生成SQL:

               insert into  sys_loginlog (username) values ('a'),('b')

      -->

     <insert id="insertBatch">

         insert into  sys_loginlog (username) values

         <foreach collection="list"  item="item"  index="index"  separator=",">

               (#{item.username})

         </foreach>

     </insert>

    /*

     * 批量写入

     */

    @Test

    public void insertBatch() {

        List<sys_loginlog> list = new ArrayList<sys_loginlog>();

        for (int i = 0, j = 10; i < j; i++) {

            sys_loginlog log = new sys_loginlog();

            log.setUsername(String.format("wangkun%s", i));

            list.add(log);

        }

        int total = loginlog.insertBatch(list);

        System.out.println("生成数据条:" + total);

    }

9、将字符串当参数出入进去

    

     <select id="selectLogByMap"     parameterType="Map"  resultType="com.mamaguwen.entity.sys_loginlog">

         select * from sys_loginlog

             where (username=#{username1} or username=#{username2} )

     </select>

  

    /*

     * 通过Map传入参数

     */

    @Test

  public   void   selectLogByMap()

  {

        Map<String, String> map=new HashMap<String,String>();

        map.put("username1", "rhythmk");

        map.put("username2", "wangkun");

       List<sys_loginlog> list= loginlog.selectLogByMap(map);

       for(sys_loginlog model:list)

       {

            String info=  String.format("id%d,username%s", model.getLogid(),

                   model.getUsername());

            System.out.println(info);

       }

  }

 10、#{}与${}的区别

     假如数据库 sys_loginlog表中有username=a,b两条数据。此时按下面配置文件，我传入'a','b'  则无法获取数据。 

     <select id="selectLogByUserName"     parameterType="Map"  resultType="com.mamaguwen.entity.sys_loginlog">

         select * from sys_loginlog

             where   username in ( #{username} )

     </select>

  

现修改where条件,换成${},那么传入的参数讲直接体会SQL中对应的文本 ：

     select * from sys_loginlog

     where   username in ( ${username} )
通过执行上面语句 生成的SQL为 :
   
    select * from sys_loginlog where username  in ('a','b')  

备注：

   表结构:

CREATE TABLE `sys_loginlog` (

  `LogId` bigint(20) NOT NULL AUTO_INCREMENT,

  `UserName` varchar(64) COLLATE utf8_bin DEFAULT NULL,

  `Pwd` varchar(32) COLLATE utf8_bin DEFAULT NULL,

  `IsLogin` bit(1) DEFAULT NULL,

  `LoginIp` varchar(64) COLLATE utf8_bin DEFAULT NULL,

  `LoginTime` datetime DEFAULT NULL,

  PRIMARY KEY (`LogId`)

) ENGINE=InnoDB AUTO_INCREMENT=15 DEFAULT CHARSET=utf8 COLLATE=utf8_bin;

 Mapp数据操作接口：

public interface sys_loginlogMapper {



    /*

     *   写入日志并返回自增的ID

     * */

    int insertLog (sys_loginlog record);

    

    /*   更新数据

     * */

    int updateLog(sys_loginlog record);

    

    /* 

     *   返回当个简单对象

     * */

    String selectStringByKey(@Param("logid") int logId );

    

    

    /*

     * 获取所有用户日志

     * */

    List<sys_loginlog>  selectLogList();

    

    /*

     *  获取所有用户名

     * */

    List<String> selectUserNameList();

    

    /*

     * 根据主键获取日志

     * */

    sys_loginlog selectLogByKey(@Param("logid") int logid);

    

    /*

     * 执行存储过程

     * */

    String callProc(@Param("str") String str);

    

    /*

     * 批量写入

     * */

    int  insertBatch(List<sys_loginlog> list);

    

    /*

     *  通过Map传入参数

     * */

   List<sys_loginlog>   selectLogByMap(Map<String, String> map);

    

}

 测试用例代码：

package com.mamaguwen.dao.test;



import java.util.ArrayList;

import java.util.Date;

import java.util.HashMap;

import java.util.List;

import java.util.Map;



import javax.management.loading.PrivateMLet;



import org.apache.commons.lang3.time.DateFormatUtils;

import org.apache.ibatis.annotations.Param;

import org.apache.log4j.Logger;

import org.junit.Test;

import org.junit.runner.RunWith;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.test.context.ContextConfiguration;

import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;



import com.mamaguwen.dao.sys_loginlogMapper;

import com.mamaguwen.entity.sys_loginlog;



@RunWith(value = SpringJUnit4ClassRunner.class)

@ContextConfiguration(locations = { "classpath:spring.xml",

        "classpath:spring-mybatis.xml" })

public class TestSysloginlogMapper {



    private static final Logger logger = Logger.getLogger(Test_SysUser.class);



    private sys_loginlogMapper loginlog;



    public sys_loginlogMapper getLoginlog() {

        return loginlog;

    }



    @Autowired

    public void setLoginlog(sys_loginlogMapper loginlog) {

        this.loginlog = loginlog;

    }



    /*

     * 写入日志并返回自增的ID

     */

    @Test

    public void insertLog() {

        sys_loginlog model = new sys_loginlog();

        model.setIslogin(true);

        model.setLoginip("127.0.0.1");

        model.setLogintime(new Date());

        model.setUsername("rhythmk");



        int total = loginlog.insertLog(model);

        System.out.println("影响数据条：" + total);

        System.out.println("ID：" + model.getLogid());

        /*

         * 影响数据条：1 ID：4 

         */



    }



    /*

     * 更新数据

     */

    @Test

    public void updateLog() {

        sys_loginlog record = new sys_loginlog();

        record.setLogid(4L);

        record.setUsername("wangkun");

        int total = loginlog.updateLog(record);

        System.out.println("影响数据条：" + total);

    }



    /*

     * 返回当个简单对象

     */

    @Test

    public void selectStringByKey() {

        String record = loginlog.selectStringByKey(4);

        System.out.println("返回的字符串:" + record);

    }



    /*

     * 获取所有用户日志

     */

    @Test

    public void selectLogList() {

        List<sys_loginlog> list = loginlog.selectLogList();

        for (sys_loginlog log : list) {

            System.out.println(log.getUsername());

        }

    }



    /*

     * 获取所有用户名

     */

    @Test

    public void selectUserNameList() {

        List<String> list = loginlog.selectUserNameList();

        for (String str : list) {

            System.out.println(str);

        }

    }



    /*

     * 根据主键获取日志

     */

    @Test

    public void selectLogByKey() {

        sys_loginlog model = loginlog.selectLogByKey(5);



        String str = String.format("id:%d,username:%s", model.getLogid(),

                model.getUsername());

        System.out.println(str);

    }



    /*

     * 执行存储过程

     */

    @Test

    public void callProc() {

        String str = loginlog.callProc("rhytmk");

        System.out.println(str);

    }



    /*

     * 批量写入

     */

    @Test

    public void insertBatch() {

        List<sys_loginlog> list = new ArrayList<sys_loginlog>();

        for (int i = 0, j = 10; i < j; i++) {

            sys_loginlog log = new sys_loginlog();

            log.setUsername(String.format("wangkun%s", i));

            list.add(log);

        }

        int total = loginlog.insertBatch(list);

        System.out.println("生成数据条:" + total);

    }



    /*

     * 通过Map传入参数

     */

    @Test

  public   void   selectLogByMap()

  {

        Map<String, String> map=new HashMap<String,String>();

        map.put("username1", "rhythmk");

        map.put("username2", "wangkun");

       List<sys_loginlog> list= loginlog.selectLogByMap(map);

       for(sys_loginlog model:list)

       {

            String info=  String.format("id%d,username%s", model.getLogid(),

                   model.getUsername());

            System.out.println(info);

       }

  }

}

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