SpringBoot+Mybatis+MySql学习

作者: dalaoyang | 来源:发表于2018-04-07 14:26 被阅读645次

介绍一下SpringBoot整合mybatis，数据库选用的是mysql。

首先创建数据库

CREATE DATABASE test;

建表以及插入初始数据(sql是从navicat中导出的)

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

-- ----------------------------
-- Table structure for user
-- ----------------------------
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `user_name` varchar(255) NOT NULL,
  `user_password` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=13 DEFAULT CHARSET=latin1;

-- ----------------------------
-- Records of user
-- ----------------------------
BEGIN;
INSERT INTO `user` VALUES (1, 'dalaoyang', '13');
INSERT INTO `user` VALUES (2, 'xiaoli', '123');
INSERT INTO `user` VALUES (3, 'xiaoxiongmao', '123');
COMMIT;

SET FOREIGN_KEY_CHECKS = 1;

下图为项目目录结构，
java---
controller包负责测试整合
dao包作为数据操作层
entity作为数据实体类

resources---
mapper写dao层对应实现的sql
mybatis里面是mybatis配置，包含typeAlias等等
sql里面放的是上面写的建表数据及sql

image

接下来直接上代码，启动类没有修改，代码如下

package com.dalaoyang;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;


@SpringBootApplication
public class SpringbootMybatisApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringbootMybatisApplication.class, args);
    }
}

application.properties包含了数据库配置，mybatis配置，代码如下:

##端口号
server.port=8888


##检查 mybatis 配置是否存在，一般命名为 mybatis-config.xml
mybatis.check-config-location =true
##配置文件位置
mybatis.config-location=classpath:mybatis/mybatis-config.xml
## mapper xml 文件地址
mybatis.mapper-locations=classpath*:mapper/*Mapper.xml
##日志级别
logging.level.com.yang.dao=debug

##数据库url
spring.datasource.url=jdbc:mysql://localhost:3306/test?characterEncoding=utf8&useSSL=false
##数据库用户名
spring.datasource.username=root
##数据库密码
spring.datasource.password=root
##数据库驱动
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

实体类User

package com.dalaoyang.entity;

import org.apache.ibatis.type.Alias;

/**
 * @author dalaoyang
 * @Description
 * @project springboot_learn
 * @package com.dalaoyang.entity
 * @email 397600342@qq.com
 * @date 2018/4/5
 */
@Alias("user")
public class User {

    private int id;
    private String user_name;
    private String user_password;

    public User(String user_name, String user_password) {
        this.user_name = user_name;
        this.user_password = user_password;
    }

    public User(int id, String user_name, String user_password) {
        this.id = id;
        this.user_name = user_name;
        this.user_password = user_password;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getUser_name() {
        return user_name;
    }

    public void setUser_name(String user_name) {
        this.user_name = user_name;
    }

    public String getUser_password() {
        return user_password;
    }

    public void setUser_password(String user_password) {
        this.user_password = user_password;
    }
}

dao层代码

package com.dalaoyang.dao;

import com.dalaoyang.entity.User;
import org.apache.ibatis.annotations.Mapper;

import java.util.List;

/**
 * @author dalaoyang
 * @Description
 * @project springboot_learn
 * @package com.dalaoyang.dao
 * @email 397600342@qq.com
 * @date 2018/4/5
 */
@Mapper
public interface UserMapper {
    User findUserByUsername(String username);

    void updateUserByUsername(User user);

    void deleteUserByUsername(String username);

    void saveUser(User user);

    List<User> getUserList();
}

UserMapper.xml代码

<?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.dalaoyang.dao.UserMapper">
    <resultMap id="user" type="com.dalaoyang.entity.User"/>
    <parameterMap id="user" type="com.dalaoyang.entity.User"/>
    <select id="findUserByUsername" parameterType="String" resultMap="user">
        SELECT * FROM user
        WHERE user_name=#{1}
    </select>


    <update id="updateUserByUsername" parameterMap="user">
        UPDATE USER SET USER_PASSWORD=#{user_password} WHERE USER_NAME=#{user_name}
    </update>

    <delete id="deleteUserByUsername" parameterType="String">
        DELETE FROM USER WHERE USER_NAME=#{1}
    </delete>

    <!-- 使用alias自定义的parameterType-->
    <insert id="saveUser" parameterType="user">
        INSERT INTO USER (user_password,user_name) VALUES (#{user_password},#{user_name})
    </insert>

    <select id="getUserList" resultMap="user">
        SELECT  * FROM USER
    </select>
</mapper>

mybatis-config.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD SQL Map Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>

    <typeAliases>
        <typeAlias alias="Integer" type="java.lang.Integer" />
        <typeAlias alias="Long" type="java.lang.Long" />
        <typeAlias alias="HashMap" type="java.util.HashMap" />
        <typeAlias alias="LinkedHashMap" type="java.util.LinkedHashMap" />
        <typeAlias alias="ArrayList" type="java.util.ArrayList" />
        <typeAlias alias="LinkedList" type="java.util.LinkedList" />
        <typeAlias alias="user" type="com.dalaoyang.entity.User"/>
    </typeAliases>
</configuration>

pom文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.dalaoyang</groupId>
    <artifactId>springboot_mybatis</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>springboot_mybatis</name>
    <description>springboot_mybatis</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.9.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.1</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

UserController

package com.dalaoyang.controller;

import com.dalaoyang.dao.UserMapper;
import com.dalaoyang.entity.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;


/**
 * @author dalaoyang
 * @Description
 * @project springboot_learn
 * @package com.dalaoyang.controller
 * @email 397600342@qq.com
 * @date 2018/4/5
 */
@RestController
public class UserController {

    @Autowired
    UserMapper userMapper;

    //http://localhost:8888/getUser?username=xiaoli2
    @RequestMapping("/getUser")
    public String getUser(String username){
        User user =userMapper.findUserByUsername(username);
        return user!=null ? username+"的密码是："+user.getUser_password():"不存在用户名为"+username+"的用户";
    }

    //http://localhost:8888/updateUser?username=xiaoli2&password=123
    @RequestMapping("/updateUser")
    public String updateUser(String password,String username){
        User user = new User(username,password);
        userMapper.updateUserByUsername(user);
        return "success!";
    }


    //http://localhost:8888/addUser?username=xiaoli2&password=123
    @RequestMapping("/addUser")
    public String addUser(String username,String password){
        User user = new User(username,password);
        userMapper.saveUser(user);
        return "success!";
    }

    //http://localhost:8888/addUser?username=xiaoli2
    @RequestMapping("/deleteUser")
    public String deleteUser(String username){
        userMapper.deleteUserByUsername(username);
        return "success!";
    }

    //http://localhost:8888/getUserList
    @RequestMapping("/getUserList")
    public List getUserList(String username, String password){
        return userMapper.getUserList();
    }
}

启动项目，访问controller上面对应的注释上的地址即可以测试，
其中包含了简单的增删改查，SpringBoot整合Mybatis就这样完成了。

源码下载：大老杨码云

个人网站：https://dalaoyang.cn

网友评论

丿丶祥灬少:求大佬有空的时候帮助一下
丿丶祥灬少:@dalaoyang

@Mapper吗，我添加了的
dalaoyang:@丿丶祥灬少或者你看一下是否扫描到mapper
dalaoyang:@丿丶祥灬少 userMapper上面有注解吗
丿丶祥灬少:@Autowired
UserMapper userMapper;

我为什么我会出现这种问题，而你的不会呢？
Could not autowire. No beans of 'UserMapper' type found.
神豪VS勇士赢:大佬这个 http://localhost:8888/updateUser?username=xiaoli2&;password=123
在做更新操作的时候并没有做处理后面参数无论如何怎么写最后返回都是 success 请问该如何处理
dalaoyang:@神豪VS勇士赢我看你这个链接后面的参数多了个；
张子裤:我讨厌idea,,,,,开玩笑的
a65b64ab2e09:可以出个整合mybaties-plus
丿丶祥灬少:写这句的时候
@Autowired
UserMapper userMapper;

我为什么我会出现这种问题，而你的不会呢？
Could not autowire. No beans of 'UserMapper' type found.
dalaoyang:@Dino__fd4e ok 这几天争取出一个

SpringBoot+Mybatis+MySql学习

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