SpringBoot(四)mybatis的使用

作爲hibernate的忠實粉絲，已經使用hibernate大概快10年了，但經過幾個生產項目的折騰，雖然hibernate也實現了所有的相應需求，但還是讓我開始討厭hibernate咯

打算新的框架採用mybatis替代hibernate，所以這裏記錄下整合過程

1、新建項目，設置pom，直接上pom的內容

<?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.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>mybatis-test</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.5.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-jdbc</artifactId>
        </dependency>
        <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>1.3.2</version>
        </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>

等maven將相應的依賴加載完成後，就開始編寫java類咯

• UserController的內容

package com.controller;




import com.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @Author:wjup
 * @Date: 2018/9/26 0026
 * @Time: 14:42
 */

@RestController
@RequestMapping("/UserInfo")
public class UserController {

    @Autowired
    private UserService userService;



    @RequestMapping("getUser/{id}")
    public String GetUser(@PathVariable int id){
         return userService.Sel(id)+"";
    }
}

UserService的內容

package com.service;

import com.entity.User;
import com.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * @Author:wjup
 * @Date: 2018/9/26 0026
 * @Time: 15:23
 */
@Service
public class UserService {
    @Autowired
    UserMapper userMapper;
    public User Sel(int id){
        return userMapper.Sel(id);
    }
}

UserMapper的內容

package com.mapper;

import com.entity.User;
import org.apache.ibatis.annotations.Select;
import org.springframework.stereotype.Repository;

/**
 * @Author:wjup
 * @Date: 2018/9/26 0026
 * @Time: 15:20
 */
@Repository
public interface UserMapper {

    User Sel(int id);
}

User的內容

package com.entity;


/**
 * @Author:wjup
 * @Date: 2018/9/26 0026
 * @Time: 14:39
 */
public class User {
    private Integer id;
    private String userName;
    private String passWord;
    private String realName;

    public Integer getId() {
        return id;
    }

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

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getPassWord() {
        return passWord;
    }

    public void setPassWord(String passWord) {
        this.passWord = passWord;
    }

    public String getRealName() {
        return realName;
    }

    public void setRealName(String realName) {
        this.realName = realName;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", userName='" + userName + '\'' +
                ", passWord='" + passWord + '\'' +
                ", realName='" + realName + '\'' +
                '}';
    }
}

UserMapper.xml的內容

<?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.mapper.UserMapper">

    <resultMap id="BaseResultMap" type="com.entity.User">
        <result column="id" jdbcType="INTEGER" property="id" />
        <result column="userName" jdbcType="VARCHAR" property="userName" />
        <result column="passWord" jdbcType="VARCHAR" property="passWord" />
        <result column="realName" jdbcType="VARCHAR" property="realName" />
    </resultMap>

    <select id="Sel" resultType="com.entity.User">
        select * from user where id = #{id}
    </select>

</mapper>

DemoApplication的內容：

package com;


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

@MapperScan("com.mapper") //掃描的mapper
@SpringBootApplication
public class DemoApplication {

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

application.yml的內容：

server:
  port: 8080

spring:
  datasource:
    username: root
    password: weiyong813
    url: jdbc:mysql://localhost:3306/springboot?useUnicode=true&useSSL=false&serverTimezone=UTC
    driver-class-name: com.mysql.jdbc.Driver

mybatis:
  mapper-locations: classpath:mapping/*Mapper.xml
  type-aliases-package: com.entity

#showSql
logging:
  level:
    com:
        mapper : debug

目錄結構如下：

sql的初始化腳步如下：

``CREATE TABLE `user` (
  `id` int(32) NOT NULL AUTO_INCREMENT,
  `userName` varchar(32) NOT NULL,
  `passWord` varchar(50) NOT NULL,
  `realName` varchar(32) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;

然後打開數據庫管理工具，添加幾條測試數據：

運行主程序後，瀏覽器上執行http://127.0.0.1:8080/UserInfo/getUser/1

如果出現以下內容

User{id=1, userName=‘dsds’, passWord=‘1ewe’, realName=‘2121212’}
則表示整合ok 一個簡單的例子到此結束。

gitee的下載地址。 [email protected]:going100/go-demo.git