SB7.spring boot 使用mybaits

其他 2019-03-19 23:11:04 阅读次数: 0

引入pom包

<!--引用mybatis-->
<dependency>
	<groupId>org.mybatis.spring.boot</groupId>
	<artifactId>mybatis-spring-boot-starter</artifactId>
	<version>1.3.0</version>
</dependency>
<!--引用mybatis-->

配置yml

mybatis:
  mapper-locations: classpath*:mapping/*Mapper.xml
  type-aliases-package: com.big.fly.object
MyBatis-Spring-Boot-Application的配置参数也是保存在application.properties文件中，使用前缀 mybatis 。
Property Description
config-location MyBatis xml config file (optional)
mapper-locations Mapper xml config files (optional)
type-aliases-package Package to search for type aliases (optional)
type-handlers-package Package to search for type aliases (optional)
executor-type Executor type: SIMPLE, REUSE, BATCH (optional)
configuration A MyBatis Configuration bean. About available properties see the MyBatis reference page. NOTE This property cannot use at the same time with the config-location.       
（Starter）设置mapper有两种方法：
①使用config-location指定一个config xml，在里面设置 mapper 和 alias 。见例子1。
②使用type-aliases-package，需要配合自动扫描Mappers使用。
 
针对第二种，需要注意的是，如果想要自动扫描Mappers，需要在Mapper接口上标注@Mapper，否则失败。另外，还需要在application.properties文件中声明：mybatis.type-aliases-package 。
 
mapper-locations这个配置参数仅当mapper xml与mapper class不在同一个目录下时有效。所以一般可以忽略。
 

启动类添加MapperScan

package com.big.fly;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.scheduling.annotation.EnableScheduling;

@SpringBootApplication
@EnableScheduling//在Spring Boot的主类中加入@EnableScheduling注解，启用定时任务的配置
@MapperScan({"com.big.fly.mapper"})//将项目中对应的mapper类的路径加进来就可以了
public class FlyApplication {
	public static void main(String[] args) {
		SpringApplication.run(FlyApplication.class, args);
	}
}
建立实例对象User 
package com.big.fly.object;

/**
 * Created by Administrator on 2018/4/15.
 */
public class User {
    private Integer userId;

    private String userName;

    private String password;

    private String phone;

    public Integer getUserId() {
        return userId;
    }

    public void setUserId(Integer userId) {
        this.userId = userId;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName == null ? null : userName.trim();
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password == null ? null : password.trim();
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone == null ? null : phone.trim();
    }
}

创建Mapper层接口

package com.big.fly.mapper;

/**
 * Created by Administrator on 2018/4/15.
 */


import com.big.fly.object.User;

import java.util.List;

public interface UserMapper {
    int deleteByPrimaryKey(Integer userId);

    int insert(User record);

    int insertSelective(User record);

    int  selectByPrimaryKey(Integer userId);

    int updateByPrimaryKeySelective(User record);

    int updateByPrimaryKey(User record);
    //这个方式我自己加的
    List<User> selectAllUser();
}

添加mapping：UserMapper.xml

<?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="com.big.fly.mapper.UserMapper" >
    <resultMap id="BaseResultMap" type="com.big.fly.object.User" >
        <id column="user_id" property="userId" jdbcType="INTEGER" />
        <result column="user_name" property="userName" jdbcType="VARCHAR" />
        <result column="password" property="password" jdbcType="VARCHAR" />
        <result column="phone" property="phone" jdbcType="VARCHAR" />
    </resultMap>
    <sql id="Base_Column_List" >
        user_id, user_name, password, phone
    </sql>
    <select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer" >
        select
        <include refid="Base_Column_List" />
        from t_user
        where user_id = #{userId,jdbcType=INTEGER}
    </select>
    <!-- 这个方法是我自己加的 -->
    <select id="selectAllUser" resultMap="BaseResultMap">
        select
        <include refid="Base_Column_List" />
        from t_user
    </select>
    <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer" >
        delete from t_user
        where user_id = #{userId,jdbcType=INTEGER}
    </delete>
    <insert id="insert" parameterType="com.big.fly.object.User" >
        insert into t_user (user_id, user_name, password,
        phone)
        values (#{userId,jdbcType=INTEGER}, #{userName,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR},
        #{phone,jdbcType=VARCHAR})
    </insert>
    <insert id="insertSelective" parameterType="com.big.fly.object.User" >
        insert into t_user
        <trim prefix="(" suffix=")" suffixOverrides="," >
            <if test="userId != null" >
                user_id,
            </if>
            <if test="userName != null" >
                user_name,
            </if>
            <if test="password != null" >
                password,
            </if>
            <if test="phone != null" >
                phone,
            </if>
        </trim>
        <trim prefix="values (" suffix=")" suffixOverrides="," >
            <if test="userId != null" >
                #{userId,jdbcType=INTEGER},
            </if>
            <if test="userName != null" >
                #{userName,jdbcType=VARCHAR},
            </if>
            <if test="password != null" >
                #{password,jdbcType=VARCHAR},
            </if>
            <if test="phone != null" >
                #{phone,jdbcType=VARCHAR},
            </if>
        </trim>
    </insert>
    <update id="updateByPrimaryKeySelective" parameterType="com.big.fly.object.User" >
        update t_user
        <set >
            <if test="userName != null" >
                user_name = #{userName,jdbcType=VARCHAR},
            </if>
            <if test="password != null" >
                password = #{password,jdbcType=VARCHAR},
            </if>
            <if test="phone != null" >
                phone = #{phone,jdbcType=VARCHAR},
            </if>
        </set>
        where user_id = #{userId,jdbcType=INTEGER}
    </update>
    <update id="updateByPrimaryKey" parameterType="com.big.fly.object.User" >
    update t_user
    set user_name = #{userName,jdbcType=VARCHAR},
      password = #{password,jdbcType=VARCHAR},
      phone = #{phone,jdbcType=VARCHAR}
    where user_id = #{userId,jdbcType=INTEGER}
  </update>
</mapper>

添加service

package com.big.fly.service;

/**
 * Created by Administrator on 2018/4/15.
 */


import com.big.fly.object.User;

import java.util.List;

/**
 * Created by Administrator on 2017/8/16.
 */
public interface UserService {

    int addUser(User user);

    List<User> findAllUser(int pageNum, int pageSize);
}
package com.big.fly.service.impl;

/**
 * Created by Administrator on 2018/4/15.
 */

import com.big.fly.mapper.UserMapper;
import com.big.fly.object.User;
import com.big.fly.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

/*import com.github.pagehelper.PageHelper;*/

/**
 * Created by Administrator on 2017/8/16.
 */
@Service(value = "userService")
public class UserServiceImpl implements UserService {

    @Autowired
    private UserMapper userMapper;//这里会报错，但是并不会影响Settings - Editor - Inspections - Spring - Spring Core - Code - Autowiring for Bean Class - disable（idea2017好像是把√去掉）

    @Override
    public int addUser(User user) {

        return userMapper.insertSelective(user);
    }

    /*
    * 这个方法中用到了我们开头配置依赖的分页插件pagehelper
    * 很简单，只需要在service层传入参数，然后将参数传递给一个插件的一个静态方法即可；
    * pageNum 开始页数
    * pageSize 每页显示的数据条数
    * */
    @Override
    public List<User> findAllUser(int pageNum, int pageSize) {
        //将参数传给这个方法就可以实现物理分页了，非常简单。
     /*   PageHelper.startPage(pageNum, pageSize);*/
        return userMapper.selectAllUser();
    }
}

添加userController调用接口

package com.big.fly.controller;

import com.big.fly.object.User;
import com.big.fly.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

/**
 * Created by Administrator on 2018/5/1.
 */
@RestController
public class userController {
    @Autowired
    private UserService userService;
    /**
     * mybatis的测试
     *
     */
    @ResponseBody
    @RequestMapping(value = "/add", produces = {"application/json;charset=UTF-8"})
    public int addUser(User user){
        return userService.addUser(user);
    }

    @ResponseBody
    @RequestMapping(value = "/all", produces = {"application/json;charset=UTF-8"})
    public Object findAllUser(){
        return userService.findAllUser(1,1);
    }
}

代码层次结构如下


测试结果


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