mybatis oracle:批量操作(增删改查)
此文主要是讲mybatis在连接oracle数据库时的一些批量操作,请各位对号入座
(最后回来补充一下,所有都是在Spring+MVC的框架下实现的)
不废话,上代码:
1、批量插入(网上很多,是针对MySQL的,被坑惨!oracle mybatis里面只能用以下这种配置)
(1)DAO:
int autoFullPass(@Param("listAutoData")List<SatisfactionSurvey> listAutoData, @Param("evaluate")String evaluate);
XML:
<insert id="autoFullPass" parameterType="java.util.List" useGeneratedKeys="false"> INSERT ALL <foreach collection="listAutoData" item="item" index="index"> into SATISFACTION_SURVEY (PROJECT_NO, EVALUATE, EMPLOYEE_NO, SUBMIT_TIME, as_side) values (#{item.projectNo}, #{evaluate}, #{item.employeeNo}, sysdate, 0) </foreach> SELECT 1 FROM DUAL </insert>
补充说明:1、foreach外包了一层sql,解决核心;2、注意foreach里面的属性配置,没有一般的begin、end、分隔符等;
3、useGeneratedKeys="false" 笔者也不清楚是不是必须加这句,大家可以不加试下
(2)后面又发现的一种方法,很好理解也很符合oracle
DAO:
int insertCircle(@Param("year")int year, @Param("quarter")int quarter, @Param("monthAry")int[] monthAry, @Param("weekAry")int[] weekAry);
//为了大家理解,特别附上service的代码: public int insertCircle(int year, int quarter) { int beginMonth = quarter * 3 - 2; int[] monthAry = {beginMonth, beginMonth + 1, beginMonth + 2}; int[] weekAry = {1, 2, 3, 4}; return testDao.insertCircle(year, quarter, monthAry, weekAry); }
上XML代码前先介绍一下在oracle里面,批量插入语句的sql样式是这样的
INSERT INTO TABLE_TEST (ID,NAME,PASSWORD,USERAGE) SELECT 'id1','zhangsan','123',20 FROM DUAL UNION ALL SELECT 'id2','lisi','321',30 FROM DUAL UNION ALL SELECT 'id3','wang','123456',40 FROM DUAL
有了这个模板,我们就很容易结合Mybatis标签,拼接出数据库可以执行sql
=====>补充一个简单的例子,方便copy(于2018-04-02日补充)
<insert id="createExamRecord" parameterType="java.util.List"> insert into CAIM_EXAM (ID, OPEN_ID, QUESTION_ID) <foreach collection="randomQus" item="item" index="index" separator="UNION ALL"> SELECT sys_guid(), #{openId}, #{item.questionId} FROM dual </foreach> </insert>
补:上面 openId 为另一个string的入参,item.questionId 为遍历对象的一个属性值
下面是一个之前的例子,不是很直白
XML:
<insert id="insertCircle" parameterType="java.util.List"> INSERT INTO SALES_WEEKLY (ID, SUB_TYPE, DISTRICT_CODE, REGION_CODE, SUB_AREA_CODE, YEAR, QUARTER, MONTH, WEEK, CREATE_USER, CREATE_TIME, WEEK_TYPE) <foreach collection="monthAry" item="item" index="index" separator="UNION ALL"> <foreach collection="weekAry" item="val" index="seq" separator="UNION ALL"> SELECT sys_guid() id,9 SUB_TYPE, 12 DISTRICT_CODE,12345 REGION_CODE,66666 SUB_AREA_CODE, #{year} YEAR,#{quarter} QUARTER, #{item} MONTH, #{val} WEEK, 'ZZ123' CREATE_USER, sysdate CREATE_TIME, 6 WEEK_TYPE FROM dual </foreach> </foreach> </insert>
补充说明:这个insert语句是没有values字段的;
笔者这个sql嵌套了双层foreach,实现了一次生成一个季度12周的12条不同记录,是参考Mybatis如何实现多重循环的参考例子
有一点需要说明,foreach里面的字段,最好用别名和数据库字段对应一下,
2、批量删除
DAO:
int deleteByListSon(@Param("listSon")List<String> listSon);
XML:
<delete id="deleteByListSon" parameterType="java.util.List"> delete from WECHAT_MENU where id in <foreach collection="listSon" item="listSon" index="index" separator="," open="(" close=")"> #{listSon} </foreach> </delete>
补充说明:这个没啥好说的,基本sql格式,比较简单
3、批量更新
(1)DAO:
int changeOnlineByListSon(@Param("listSon")List<String> listSon, @Param("deleted")int deleted);
XML:
<update id="changeOnlineByListSon"> update WECHAT_MENU <set> <if test="deleted == 0" > DELETED = 2, </if> <if test="deleted == 2" > DELETED = 0, </if> PUBLISH = 0, UPDATE_DATE = sysdate, </set> where ID in <foreach collection="listSon" item="item" index="index" separator="," open="(" close=")"> #{item} </foreach> </update>
补充说明:这种还算简单的,是list<string>类型,foreach比较容易,笔者这个sql功能在于切换某菜单的上、下线状态,所以有deleted(没用status有原因、勿喷)这个值(0:上线;2下线)
(2)DAO:
public int saveRegionKpi(@Param("updateToDB")List<HwRegionWeekly> updateToDB, @Param("employeeNo")String employeeNo);
XML:
<update id="updateRole" parameterType="java.util.List"> <foreach collection="updateToDB" item="record" index="index" open="begin" close=";end;" separator=";"> update SSM_ROLE <set> <if test="record.updateUser != null"> UPDATE_USER = #{employeeNo}, </if> <if test="record.updateTime != null"> UPDATE_TIME = sysdate, </if> <if test="record.annualHosKpi != null"> ANNUAL_HOS_KPI = #{record.annualHosKpi,jdbcType=DECIMAL}, </if> <if test="record.ytdPlanHos != null"> YTD_PLAN_HOS = #{record.ytdPlanHos,jdbcType=DECIMAL}, </if> <if test="record.status == 1"> STATUS = 1, SUBMIT_USER = #{employeeNo}, SUBMIT_TIME = sysdate, </if> <if test="record.manageMeeting != null"> MANAGE_MEETING = #{record.manageMeeting,jdbcType=DECIMAL}, </if> <if test="record.remark != null"> REMARK = #{record.remark} </if> </set> where ID = #{record.id} </foreach> </update>
补充说明:首先,注意比较和(1)的区别,(1)里面所有更新的行中,每个字段更改的值都是一样的;
其次,(2)更新的多行里面。同样的字段也可能更新不同的值,其实(2)就是多条并行执行的更新语句,只不过用了mybatis的特性,
最后,主要还是要注意,(2)这种情况,foreach标签的正确写法
4、批量查询
DAO:
List<SatisfactionSurvey> listJointData(@Param("listProNo")List<Project> listProNo);
XML:
<select id="listJointData" resultMap="BaseMap"> select r.project_no as PROJECT_NO, r.party_a_manager_no as employee_no, 0 as as_side from requirement r where r.project_no in <foreach collection="listProNo" index="index" item="val" separator="," open="(" close=")"> #{val.projectNo} </foreach> </select>
补充说明:这种没啥好说的,主要是foreach里面的配置,也是拼接出数据库能识别的sql语句
(特别新加)关于集合和数组的foreach的配置区别,笔者(2017/10/31)亲自遇到了一个例子,DAO层代码如下
public List<HWList> getAdxSub(@Param("listAdxSub")String[] listAdxSub);//最简单的字符数组
and c.sub_area_code in <foreach collection="listAdxSub" index="index" item="val" separator="," open="(" close=")"> #{val}<!--也可以写成to_number(${val},999999) 这种只能用$符,外面那种#$都可以,当然 ${val} === ${listAdxSub[index]} --> </foreach>
数组的foreach配置,并不像网上好多说的那样,collection要配成array(反而这样会直接报错),而是和集合的一模一样,只是取值的方式,有不同于集合的方法(如上===)
只是在config里面的配置,一开始前后多加了一对双引号:ADXSubarea = “60109,60110,60111,60116“;导致split()处理后的数据异常,导致错误(配置文件里面的都是默认string类型的,不需要用“”包起来)
==》》以上方法Mybatis会帮我们进行sql注入拦截,Mybatis如果采用#{xxx}的形式设置参数,Mybatis会进行sql注入的过滤。如果采用的是${xxx},Mybatis不会进行sql注入过滤,而是直接将参入的内容输出为sql语句。
5、总结比较
(1)、批量操作,重点在foreach的配置,不熟悉的伙伴可以先多去了解一下mybatis foreach标签的属性和用法
(2)、上面的例子还掺杂了其他很多,可以学习和借鉴的点,仔细看,多发现(以上例子都是,从已上线的项目中抽出来的,绝对是通过测试的)
(3)、以上的例子传入mybatis的参数,基本都是list集合(项目上用到的也几乎全是list),实际情况也可能是map,这里特别附上一例(map的批量查询,加UNION ALL)
附:批量查询--map参数
DAO:
List<ShowEvaluateList> getListShowInfo(@Param("allProNo")Map<String, List<String>> allProNo, @Param("limit")int limit, @Param("page")int page, @Param("beginDate")String beginDate, @Param("endDate")String endDate, @Param("keyProName")String keyProName, @Param("keyPartyA")String keyPartyA, @Param("keyPartyB")String keyPartyB);//(后面的参数都是条件过滤和分页用的<貌似分页功能没实现>) Map<String, List<String>> allNoEva = new HashMap<>(); allNoEva.put("A", allNoEvaA); allNoEva.put("B", allNoEvaB); //说明:allNoEvaA、allNoEvaB都是List<String>类型的集合(也就是做为甲方和乙方时,未评价的项目的projectNo的集合)
XML:
<select id="getListShowInfo" resultMap="ListShowMap"> <foreach collection="allProNo.keys" index="k" item="ent" separator="UNION ALL"> select row_number() over(order by 1) as rowIndex, r.project_name as PRO_NAME, r.project_no as PRO_NO, <choose> <when test='ent == "A"'> r.party_a_manager as PER, r.party_a_manager_no as PER_ID, p.actual_online as ACTUAL_END, 0 as WHICH_PARTY </when> <otherwise> r.party_b_manager as PER, r.party_b_manager_no as PER_ID, p.actual_online as ACTUAL_END, 1 as WHICH_PARTY </otherwise> </choose> FROM requirement r left join project p on p.project_no = r.project_no where (p.status = 3 or p.status = 4) <include refid="filterSql"></include> <choose> <when test="allProNo[ent].size() != 0"> and r.project_no in <foreach collection="allProNo[ent]" index="v" item="val" separator="," open="(" close=")"> #{val} </foreach> </when> <otherwise> and r.project_no = 'sssssssssssss' </otherwise> </choose> </foreach> </select>
补充说明:(1)主要是参考map参数,在mybatis里面怎么循环取健和取值
(2)map的话要结合union all使用(关于和union的区别,貌似是union all不去重,union会去重且有些情况会排序取出的数据顺序)
最后,特别加上条件过滤用的sql:<include refid="filterSql"></include>,以供参考,如下:
<sql id="filterSql"> and 1 = 1 <if test="beginDate != null and beginDate != ''"> and p.ACTUAL_ONLINE > to_date(#{beginDate}, 'YYYY/MM/DD') </if> <if test="endDate != null and endDate != ''"> and to_date(#{endDate}, 'YYYY/MM/DD') > p.ACTUAL_ONLINE </if> <if test="keyProName != null and keyProName != ''"> and p.name like '%${keyProName}%' </if> <if test="keyPartyA != null and keyPartyA != ''"> and r.party_a_manager like '%${keyPartyA}%' </if> <if test="keyPartyB != null and keyPartyB != ''"> and r.party_b_manager like '%${keyPartyB}%' </if> </sql>