Mybatis 多条件查询（模糊查询 使用in查询）

Mybatis支持多个条件的查询，使用if标签拼接。

下面是三个条件的查询得例子，使用的数据库是mysql，用到了模糊查询及in做条件查询。

xml文件：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="">
<select id="selectTeacher" parameterType="map" resultType="map">
select t.tid,t.tname,t.taddr
from test_teacher t
where 1=1
<if test="tid != '' and tid != null">
and tid=#{tid}
</if>
<if test="tname != '' and tname != null">
and tname like #{tname}
</if>
<if test="addrs != '' and addrs != null">
and taddr in
<foreach item="item" index="index" collection="addrs" open="("
separator="," close=")">
#{item}
</foreach>
</if>

</select>

</mapper>

dao层：

package mybatis.dao;

import java.util.List;

public interface TestTeacherDao {
public List selectTeacher(String tid,String tname,List addrs);
}

package mybatis.dao;

import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

public class TestTeacherDaoImpl implements TestTeacherDao {
private int res=-1;
private SqlSession sqlSession=null;
public  SqlSession getSqlSession(){

try{
String resource="mybatis-config.xml";
InputStream is=org.apache.ibatis.io.Resources.getResourceAsStream(resource);
SqlSessionFactory sqlSessionFactory=new SqlSessionFactoryBuilder().build(is);
sqlSession=sqlSessionFactory.openSession(true);

}catch(Exception e){
System.out.println("出错");
e.printStackTrace();
}
return sqlSession;
}
@Override
public List selectTeacher(String tid,String tname,List addrs) {
Map map=new HashMap();
map.put("tid", tid);
map.put("tname", "%"+tname+"%");
map.put("addrs",addrs);

sqlSession=getSqlSession();
List list=sqlSession.selectList("selectTeacher", map);
return list;
}

}

测试：
package mybatis.test;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import mybatis.dao.TestTeacherDao;
import mybatis.dao.TestTeacherDaoImpl;

public class Test {

public static void main(String[] args) {
TestTeacherDao td=new TestTeacherDaoImpl();
List addrs=new ArrayList();
addrs.add("shandong");
addrs.add("beijing");
List list=td.selectTeacher("", "",addrs);
for(int i=0;i<list.size();i++){
Map map=(Map)(list.get(i));
System.out.println(map.get("tname"));
}
}

}