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 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 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

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