标签：alt app esc ref 类型 pos format sum order
本文验证了通过mybatis访问数据库时的，增删改查的返回值情况。
直接看代码。
1、service层
/** *@Author: Administrator on 2020/3/12 15:15 *@param: *@return: *@Description:查询同步情况 */ @Override public PageInfo getSyncstatusPages(Syncstatus vo, int pageNo, int pageSize) { PageHelper.startPage(pageNo, pageSize); /* //查看增删改查的返回值 //1新增：返回值自己定义，可以是void，int //1-1新增一条数据:插入成功,返回值为1 int insert_success1 = yylfHttpServletMapper.insert("8", "2", "1"); //1-2新增多条数据:插入成功，返回值为插入的数据条数，当有一条数据错误时，所有数据都会插入失败 int insert_success2 = yylfHttpServletMapper.insert_duotiao("7"); String insert_success3 = yylfHttpServletMapper.insert_duotiao_String("7");//不支持返回值为String类型 //1-3新增一条数据:插入失败：主键冲突，会直接报异常 int insert_failed = yylfHttpServletMapper.insert("1", "2", "1"); //1-4插入null：属性为null，如果表中所有字段允许为null，插入一条所有值均为null的数据 Syncstatus syncstatus1 = null; yylfHttpServletMapper.insertSyncstatus(syncstatus1); //1-5插入一个没有赋值的对象：属性为null，如果表中所有字段允许为null，插入一条所有值均为null的数据 Syncstatus syncstatus2 = new Syncstatus(); yylfHttpServletMapper.insertSyncstatus(syncstatus2);*/ /*//2删除:返回值自己定义，可以是void，int //2-1删除成功：没有数据:返回值为0 int delete_success1 = yylfHttpServletMapper.delete("0"); //2-2删除成功：有多条数据：返回值为删除的数据条数 int delete_success2 = yylfHttpServletMapper.delete_systemcode("2"); //2-3删除失败：例如有外键:报异常 int delete_fail = yylfHttpServletMapper.delete("1");*/ //3更新:返回值自己定义，可以是void，int //3-1更新成功：没有数据，返回值为0 int update_no = yylfHttpServletMapper.update_no("0"); //3-2更新成功：有多条数据，返回更新的数据条数 int update_duotiao = yylfHttpServletMapper.update_duotiao_systemcode("2"); //3-3更新失败：例如有外键，报异常 //int update_fail = yylfHttpServletMapper.update_fail("1"); //4查询 //4-1 没数:String 类型返回null Object object = yylfHttpServletMapper.select("0"); //4-1 没数:集合 类型返回[]空集合 Syncstatus syncstatus3 = new Syncstatus(); syncstatus3.setStatus("7"); List<Syncstatus> page0 = yylfHttpServletMapper.getSyncstatusList(syncstatus3); //4-1 没数:int 类型返回null,如果定义为int会报错。因为没数时返回null，可以将返回类型改为String String i = yylfHttpServletMapper.select_int(0); //4-1：当返回值为对象时，若返回值为空，则返回null //4-2 有数 List<Syncstatus> pages = yylfHttpServletMapper.getSyncstatusList(vo); return new PageInfo<Syncstatus>(pages); }
2、mapper
/** * @author zs * @date 2019/10/18 16:03 */ @Repository public interface YylfHttpServletMapper { //删除预约临分未到期数据 void deleteZrjunearnedfac(Date startdate); //保存预约临分未到期数据 void addZrjunearnedfac(List<Zrjunearnedfac> zrjunearnedfacList); //删除据提取信息 void deleteSyncstatus(String uuid); //保存数据提取信息 void insertSyncstatus(Syncstatus syncstatus); //查询数据同步信息 List<Syncstatus> getSyncstatusList(@Param("vo")Syncstatus vo); //获取日志信息 List<InterfaceLog> getYylfNewLog(@Param("uuid")String uuid, @Param("sendsystemcode")String sendsystemcode); //新增 int insert(@Param("uuid")String uuid, @Param("systemcode")String systemcode, @Param("status")String status); int insert_duotiao(@Param("uuid")String uuid); String insert_duotiao_String(@Param("uuid")String uuid); //删除 int delete(@Param("uuid")String uuid); int delete_systemcode(@Param("systemcode")String systemcode); //修改 int update_no(@Param("uuid")String uuid); int update_duotiao_systemcode(@Param("systemcode")String systemcode); int update_fail(@Param("uuid")String uuid); //查询 Object select(@Param("uuid")String uuid); String select_int(@Param("uuid")int uuid); }
3、mapper.xml
<insert id="insert" parameterType="java.util.Map"> insert into aaa (uuid,systemcode,status) value (#{uuid,jdbcType=VARCHAR},#{systemcode,jdbcType=VARCHAR},#{status,jdbcType=VARCHAR}) </insert> <insert id="insert_duotiao" parameterType="java.util.Map"> insert into aaa (uuid,systemcode,status) value (‘1‘,‘2‘,‘2‘),(‘6‘,‘2‘,‘2‘) </insert> <insert id="insert_duotiao_String" parameterType="java.util.Map"> insert into aaa (uuid,systemcode,status) value (‘5‘,‘2‘,‘2‘),(‘6‘,‘2‘,‘2‘) </insert> <delete id="delete"> delete from aaa where uuid = #{uuid,jdbcType=VARCHAR} </delete> <delete id="delete_systemcode"> delete from aaa where systemcode = #{systemcode,jdbcType=VARCHAR} </delete> <update id="update_no"> UPDATE aaa SET status = ‘0‘ WHERE uuid = #{uuid,jdbcType=VARCHAR} </update> <update id="update_duotiao_systemcode"> UPDATE aaa SET systemcode = ‘3‘ WHERE systemcode = #{systemcode,jdbcType=VARCHAR} </update> <update id="update_fail"> UPDATE aaa SET uuid = ‘0‘ WHERE uuid = #{uuid,jdbcType=VARCHAR} </update> <select id="select"> select uuid from aaa where uuid = ‘0‘ </select> <select id="select_int" resultType="String"> select uuid from aaa where uuid = 0 </select> <select id="getSyncstatusList" resultMap="syncstatusToRow"> select uuid,startdate as paydate ,date(createtimefordw) as syndate ,status, sum(case when tablename=‘zrjunearnedfac‘ then zrjcount end) as zrjunearnedfacNum, sum(case when tablename=‘zrjoutstandingfac‘ then zrjcount end) as zrjoutstandingfacNum from syncstatus where 1=1 AND systemcode = ‘YYLF‘ <if test=" vo.startdate != null and vo.enddate !=null " > AND startdate between #{vo.startdate} and #{vo.enddate} </if> <if test="vo.status != ‘‘ and vo.status != null " > AND status = #{vo.status} </if> group by uuid,startdate,createtimefordw,status order by startdate,date(createtimefordw) desc </select>
4、sql语句
-- 创建aaa表用来验证增删改查的返回值 CREATE TABLE `reserve`.`aaa` ( `uuid` char(36) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL, `systemcode` varchar(8) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL, `status` varchar(1) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL, PRIMARY KEY (`uuid`) USING BTREE ) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic; -- 新增 insert into aaa (uuid,systemcode,status)value (‘1‘,‘2‘,‘2‘); insert into aaa (uuid,systemcode,status)value (‘2‘,‘2‘,‘2‘); insert into aaa (uuid,systemcode,status)value (‘3‘,‘2‘,‘2‘); insert into aaa (uuid,systemcode,status)value (‘4‘,‘2‘,‘2‘); insert into aaa (uuid,systemcode,status)value (‘5‘,‘2‘,‘2‘),(‘6‘,‘2‘,‘2‘); -- 删除 delete from aaa where uuid = ‘0‘; delete from aaa where uuid != ‘1‘; delete from aaa where uuid = ‘2‘; -- 修改 UPDATE aaa SET systemcode = ‘3‘ WHERE uuid = ‘1‘; UPDATE aaa SET uuid = ‘0‘ WHERE uuid = ‘2‘; -- 查询 select * from aaa; -- 创建bbb表用来关联aaa的uuid作外键 CREATE TABLE `reserve`.`bbb` ( `uuid` char(36) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL, `systemcode` varchar(8) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL, `status` varchar(1) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL, PRIMARY KEY (`uuid`) USING BTREE ) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic; alter table bbb add constraint FK_T_POSITI_REFERENCE_T_COMPAN foreign key (uuid)references aaa (uuid); insert into bbb (uuid,systemcode,status)value (‘1‘,‘2‘,‘2‘); -- 创建ccc表用来验证插入的为null的数据 CREATE TABLE `reserve`.`ccc` ( `uuid` char(36) CHARACTER SET utf8 COLLATE utf8_general_ci , `systemcode` varchar(8) CHARACTER SET utf8 COLLATE utf8_general_ci , `status` varchar(1) CHARACTER SET utf8 COLLATE utf8_general_ci ) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic; insert into ccc (uuid,systemcode,status)value (NULL,NULL,NULL); select *from ccc; -- 创建ddd表用来验证查询结果为空时的返回值 CREATE TABLE `reserve`.`ddd` ( `uuid` INT , `systemcode` varchar(8) CHARACTER SET utf8 COLLATE utf8_general_ci , `status` varchar(1) CHARACTER SET utf8 COLLATE utf8_general_ci ) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic; insert into ddd (uuid,systemcode,status)value (1,‘2‘,‘2‘); select *from ddd;
标签：alt app esc ref 类型 pos format sum order
原文地址：https://www.cnblogs.com/vole/p/12838210.html
