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本文小編為大家詳細(xì)介紹“Mybatis在注解上怎么實(shí)現(xiàn)動態(tài)SQL”,內(nèi)容詳細(xì),步驟清晰,細(xì)節(jié)處理妥當(dāng),希望這篇“Mybatis在注解上怎么實(shí)現(xiàn)動態(tài)SQL”文章能幫助大家解決疑惑,下面跟著小編的思路慢慢深入,一起來學(xué)習(xí)新知識吧。
使用Mybatis注解實(shí)現(xiàn)sql語句,但是有些時候有些字段是空的,這時候這個空的字段就要從條件查詢語句中刪除,這個時候就需要用到動態(tài)Sql。
trim
where
set
foreach
if
choose
when
otherwise
bind
@Select({"<script> " + "select * from t_user " + "where 1=1 " + "<if test='userId!=null'> and id = #{userId}</if> " + "</script>"})
要加上標(biāo)簽就可以實(shí)現(xiàn)條件判斷
但是在無法使用大于號 、小于號,那如何解決這問題呢,其實(shí)只要把大于號、小于號轉(zhuǎn)義即可
@Select({"<script>" + "select * from tb_examine" + "<where> 1 = 1" + "<if test = \" employeeId != null and employeeId != '' \"> AND employee_id = #{employeeId} </if>" + "<if test = \" gradeId != null and gradeId != '' \"> AND grade_id = #{gradeId} </if>" + "<if test = \" year != null and year != '' \"> AND year like #{year} </if>" + "<if test = \" (statrMonth != null and statrMonth != '') and (endMonth == null or endMonth == '') \"> AND month >= #{statrMonth} </if>" + "<if test = \" (statrMonth == null or statrMonth == '') and (endMonth != null and endMonth != '') \"> AND month <= #{endMonth} </if>" + "<if test = \" (statrMonth != null and statrMonth != '') and (endMonth != null and endMonth != '') \">AND month >= #{statrMonth} AND month <= #{endMonth} </if>" + "</where>" + "</script>"}) public List<Examine> getName(Examine examine);
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