<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.jaeson.mybatis.dao.StudentMapper"> <resultMap type="com.jaeson.mybatis.model.Student" id="studentmap"> <id column="student_id" property="id"/> <result column="student_name" property="name"/> <result column="student_sex" property="sex"/> <association property="clazz" javaType="com.jaeson.mybatis.model.Clazz"> <id property="id" column="clazz_id"/> <result property="name" column="clazz_name"/> </association> </resultMap> <sql id="Base_Column_List" > s.id as student_id, s.name as student_name, s.sex as student_sex, s.clazz_id as student_clazz, c.id as clazz_id, c.name as clazz_name </sql> <select id="getStudent" parameterType="java.lang.String" resultMap="studentmap"> select <include refid="Base_Column_List" /> from student s left outer join clazz c on s.clazz_id=c.id where s.id=#{id} </select> <select id="getAll" resultMap="studentmap"> select <include refid="Base_Column_List" /> from student s left outer join clazz c on s.clazz_id=c.id </select> <insert id="save" parameterType="com.jaeson.mybatis.model.Student" > insert into student <trim prefix="(" suffix=")" suffixOverrides="," > <if test="1==1" > id, </if> <if test="1==1" > name, </if> <if test="1==1" > sex, </if> <if test="clazz!=null" > clazz_id, </if> </trim> <trim prefix="values (" suffix=")" suffixOverrides="," > <if test="1==1" > #{id}, </if> <if test="1==1" > #{name}, </if> <if test="1==1" > #{sex}, </if> <if test="clazz!=null" > #{clazz.id}, </if> </trim> </insert> <update id="update" parameterType="com.jaeson.mybatis.model.Student"> update student set name=#{name}, sex=#{sex} <if test="clazz!=null" > ,clazz_id=#{clazz.id} </if> where id=#{id} </update> <delete id="delete" parameterType="java.lang.String"> delete from student where id=#{id} </delete> </mapper>
package com.jaeson.mybatis.dao; import java.util.List; import com.jaeson.mybatis.model.Student; public interface StudentMapper { public int save(Student student); public int update(Student student); public int delete(String id); public Student getStudent(String id); public List<Student> getAll(); }
package com.jaeson.mybatis.service.impl; import java.util.List; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; //import org.springframework.transaction.annotation.Transactional; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import com.jaeson.mybatis.model.Student; import com.jaeson.mybatis.service.StudentService; import com.jaeson.mybatis.dao.StudentMapper; @Service public class StudentServiceImpl implements StudentService { private static final Logger logger = LoggerFactory.getLogger(StudentServiceImpl.class); @Autowired private StudentMapper mapper; @Override public int save(Student student) { logger.info("save student(id={}, name={})", student.getId(), student.getName()); return mapper.save(student); } @Override public int update(Student student) { logger.info("update student(id={}, name={})", student.getId(), student.getName()); return mapper.update(student); } @Override public int delete(String id) { logger.info("delete student(id={})", id); return mapper.delete(id); } @Override public Student getStudent(String id) { logger.info("get student(id={})", id); return mapper.getStudent(id); } @Override public List<Student> getAll() { logger.info("getAll()"); return mapper.getAll(); } }