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。