mybatis and,or复合查询操作

要查询的sql:

select * from user where name = ? and (age=? or city=?);

方法1:不使用Example查询

直接在usermapper.xml中修改sql

方法2:使用Example查询

sql可转换成

select * from user where (name = ? and age=?) or (name=? and city=?);

然后使用Example查询

UserExample example=new UserExample();

example.or().orAgeLike("%"+searchParam+"%").andNameEqualTo(userName);

example.or().orCityLike("%"+searchParam+"%").andNameEqualTo(userName);

补充知识:MySQL/Mybatis多个AND和OR混用注意事项

mysql中AND的优先级高于OR,所以在查询时,会优先执行AND条件,除非使用()来将一个AND和OR括起来,这样才能使得OR得以按照语句的顺序执行。

如下图所示:

java测试代码

@Test

public void TestMutil(){

Species species = new Species();

ArrayList<String> arrayList = new ArrayList<String>();

arrayList.add("长喙蚤");

arrayList.add("尤氏");

List<Species> querySpeciesesListByMutilCondition = this.speciesMapper.querySpeciesesListByMutilCondition(arrayList, species.getEnglishName(), species.getHost(), species.getPosition(), species.getLocation(), species.getPhylum(), species.getClassName(), species.getOrder(), species.getFamily(), species.getJenus());

for (Species s : querySpeciesesListByMutilCondition) {

System.out.println(s);

}

System.out.println(querySpeciesesListByMutilCondition.size());

}

Mapper文件中没有使用()放在语句中执行情况

<select id="querySpeciesesListByMutilCondition" resultType="Species">

SELECT * FROM t_json_species

<where>

<if test="englisName != null and englisName != ''">AND englishName like CONCAT('%',#{englishName},'%') OR sameName like CONCAT('%',#{englishName},'%')</if>

<if test="host != null and host != ''">AND host like CONCAT('%',#{host},'%')</if>

<if test="position != null and position != ''">AND position like CONCAT('%',#{position},'%')</if>

<if test="location != null and location != ''">AND location like CONCAT('%',#{location},'%')</if>

<if test="phylumName != null and phylumName != ''">AND phylumName = #{phylumName}</if>

<if test="className != null and className != ''">AND className = #{className}</if>

<if test="orderName != null and orderName != ''">AND orderName = #{orderName}</if>

<if test="familyName != null and familyName != ''">AND familyName = #{familyName}</if>

<if test="jenusName != null and jenusName != ''">AND jenusName = #{jenusName}</if>

<if test="nameList != null and nameList != ''">

<foreach collection="nameList" item="name" >AND name like CONCAT('%',#{name},'%') OR sameName like CONCAT('%',#{name},'%')</foreach>

</if>

</where>

</select>

Mapper文件中使用()放在语句中执行情况

<select id="querySpeciesesListByMutilCondition" resultType="Species">

SELECT * FROM t_json_species

<where>

<if test="englisName != null and englisName != ''">AND englishName like CONCAT('%',#{englishName},'%') OR sameName like CONCAT('%',#{englishName},'%')</if>

<if test="host != null and host != ''">AND host like CONCAT('%',#{host},'%')</if>

<if test="position != null and position != ''">AND position like CONCAT('%',#{position},'%')</if>

<if test="location != null and location != ''">AND location like CONCAT('%',#{location},'%')</if>

<if test="phylumName != null and phylumName != ''">AND phylumName = #{phylumName}</if>

<if test="className != null and className != ''">AND className = #{className}</if>

<if test="orderName != null and orderName != ''">AND orderName = #{orderName}</if>

<if test="familyName != null and familyName != ''">AND familyName = #{familyName}</if>

<if test="jenusName != null and jenusName != ''">AND jenusName = #{jenusName}</if>

<if test="nameList != null and nameList != ''">

<foreach collection="nameList" item="name" >AND (name like CONCAT('%',#{name},'%') OR sameName like CONCAT('%',#{name},'%'))</foreach>

</if>

</where>

</select>

补充:

如果这里使用多个%来解决上述的含有多个OR和AND情况,那么所实现功能会有问题,因为多个关键词有%来连接,会有一个次序问题。具体效果见下图

以上这篇mybatis and,or复合查询操作就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持。

以上是 mybatis and,or复合查询操作 的全部内容, 来源链接: utcz.com/z/358865.html

回到顶部