mybatis開發常見SQL使用手冊

1、mybatis中的foreach條件的使用；
一、在xml文件中寫法範例：
<if test="actionTypeList !=null and actionTypeList.size !=0">
        and a.actionType in
        <foreach item="item" index="index" collection="actionTypeList" open="(" separator="," close=")">
             #{item}
        </foreach>
    </if>
二、在dao層使用Map<String,Object> map

三、在java中使用範例：
Map<String,Object> map=new HashMap<String,Object>();
            List<String> actionTypeList=new ArrayList<String>();
            actionTypeList.add("1");//活動
            map.put("actionTypeList", actionTypeList);
            map.put("userId", userId);


2、mybatis針對大於小於等特殊符號寫法範例：
<if test="readTime != null and readTime !=''">
        and a.createTime <![CDATA[>=]]> #{readTime,jdbcType=BIGINT}
    </if>

<if test="condition != null and condition =='0'.toString()">
</if>

AND IFNULL(parentId,'')!=''
3、mysql中order by的使用範例：
ORDER BY    CONVERT(ap.joinCount,SIGNED) DESC --針對數字的排序

ORDER BY    CONVERT(v.userName USING gbk) COLLATE gbk_chinese_ci   --中文排序

like 寫法：

<if test="keyWord != null and keyWord !=''">
  and (f.docNo like '%${keyWord}%' or f.userName like '%${keyWord}%' )
</if>

4、mybatis中的if else
<choose>  
        <when test="title != null and title !=''">  
            and title = #{title}  
        </when>  
        <when test="content != null and content !=''">  
            and content = #{content}  
        </when>  
        <otherwise>  
            and owner = "owner1"  
        </otherwise>  
    </choose> 

 

5、批量insert寫法

List<CompanyModuleAssignee> insertList = new ArrayList<>();//批量插入
for (int i = 0; i < defaultModuleAssignees.size(); i++) {
                    //保存執行人範圍模塊之間關聯
                   CompanyModuleAssignee companyModuleAssignee=new CompanyModuleAssignee();
                    companyModuleAssignee.setCompanyModuleAssigneeId(UUIDUtils.getGUID());
                    companyModuleAssignee.setTaskAssigneeId(taskAssigneeId);
                    companyModuleAssignee.setModuleId(assigneeDto.getModuleId());
                    companyModuleAssignee.setCompanyId(companyId);

                    companyModuleAssignee.setCreateUserId(loginUserId);
                    companyModuleAssignee.setCreateTime(DateUtils.getCurTimestamp());
                    companyModuleAssignee.setUpdateTime(companyModuleAssignee.getCreateTime());
                    companyModuleAssignee.setDelFlag(StringUtils.COMMON_VALUE_0);
                    insertList.add(companyModuleAssignee);
}
companyModuleAssigneeMapper.batchInsert(insertList);

mapper 寫法：

/**
 * 批量新增公司模塊執行人範圍數據
 * @param
 * @return
 * @author ph.lin
 * @date 2017/2/16
 */
int batchInsert(List<CompanyModuleAssignee> list);

xml寫法：

<insert id="batchInsert" parameterType="java.util.List">
  insert into ju_gp_company_module_assignee (companyModuleAssigneeId, taskAssigneeId,
  companyId, moduleId, createTime,
  updateTime, createUserId, updateUserId,
  delFlag)
  values
  <foreach collection="list" item="item" index="index" separator="," >
    (#{item.companyModuleAssigneeId,jdbcType=VARCHAR}, #{item.taskAssigneeId,jdbcType=VARCHAR},
    #{item.companyId,jdbcType=VARCHAR}, #{item.moduleId,jdbcType=VARCHAR}, #{item.createTime,jdbcType=BIGINT},
    #{item.updateTime,jdbcType=BIGINT}, #{item.createUserId,jdbcType=VARCHAR}, #{item.updateUserId,jdbcType=VARCHAR},
    #{item.delFlag,jdbcType=VARCHAR})
  </foreach>
</insert>

 

long cur = DateUtils.getTheDayStartTimestamp(srvStartTime).getTime();  //服務開始時間當天0點
long afterTime =  DateUtils.getTheDayEndTimestamp(srvEndTime).getTime();//服務結束時間當天24點

 

SELECT YEAR
  ( FROM_UNIXTIME(create_time/1000) ) '年',
  MONTH ( FROM_UNIXTIME(create_time/1000) ) '月',
  COUNT( u_id ) '會員合計' 
FROM
  kzj_ur_user 
  WHERE sys_flag=0 AND user_status=1
GROUP BY
  YEAR ( FROM_UNIXTIME(create_time/1000) ),
  MONTH ( FROM_UNIXTIME(create_time/1000) )