标签：mybatis-动态查询
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import org.apache.ibatis.session.SqlSession;
import cn.itcast.javaee.mybatis.util.MybatisUtil;
/**
* 持久层
* @author AdminTC
*/
public class StudentDao {
/**
* 有条件的查询所有学生
*/
public List<Student> findAll(Integer id,String name,Double sal) throws Exception{
SqlSession sqlSession = null;
try{
sqlSession = MybatisUtil.getSqlSession();
Map<String,Object> map = new LinkedHashMap<String,Object>();
map.put("pid",id);
map.put("pname",name);
map.put("psal",sal);
return sqlSession.selectList("studentNamespace.findAll",map);
}catch(Exception e){
e.printStackTrace();
throw e;
}finally{
MybatisUtil.closeSqlSession();
}
}
public static void main(String[] args) throws Exception{
StudentDao dao = new StudentDao();
List<Student> studentList = dao.findAll(5,"哈哈",7000D);
for(Student s : studentList){
System.out.println(s.getId()+":"+s.getName()+":"+s.getSal());
}
}
}
<?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="studentNamespace">
<resultMap type="cn.itcast.javaee.mybatis.app11.Student" id="studentMap">
<id property="id" column="students_id"/>
<result property="name" column="students_name"/>
<result property="sal" column="students_sal"/>
</resultMap>
<select id="findAll" parameterType="map" resultMap="studentMap">
select * from students
<where>
<if test="pid!=null">
and students_id = #{pid}
</if>
<if test="pname!=null">
and students_name = #{pname}
</if>
<if test="psal!=null">
and students_sal = #{psal}
</if>
</where>
</select>
</mapper>
标签：mybatis-动态查询
原文地址：http://blog.51cto.com/357712148/2107442
