springboot学习五：springboot整合Mybatis 连接 mysql数据库

springboot学习五：springboot整合Mybatis 连接 mysql数据库

冯insist

1552人浏览 · 2022-08-12 15:30:49

冯insist · 2022-08-12 15:30:49 发布

导言

一、准备工作：快速创建项目

1. 创建项目

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2. 项目细节

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3. 勾选项目依赖（重点）

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4. 项目结构

我这里修改了一个 banner.txt。
在这里插入图片描述

5. 修改 application.yml 配置文件

修改 application.properties 配置文件后缀为： application.yml
配置数据源内容，否则报错。

spring:
  datasource:
    username: root
    password: 123456
    #?serverTimezone=UTC解决时区的报错
    url: jdbc:mysql://IP:3306/feng?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8
    driver-class-name: com.mysql.cj.jdbc.Driver

6. pom.xml 依赖

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.7.2</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.feng.mybatis</groupId>
	<artifactId>springboot_mybatis</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>springboot_mybatis</name>
	<description>springboot_mybatis</description>
	<properties>
		<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>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>

二、mybatis 环境配置

1. mybatis 依赖:mybatis-springboot-starter

a、添加依赖

导入mybatis-springboot-starter依赖

  <!-- mybatis-springboot-starter-->
  <dependency>
      <groupId>org.mybatis.spring.boot</groupId>
      <artifactId>mybatis-spring-boot-starter</artifactId>
      <version>2.2.2</version>
  </dependency>

b、全部依赖

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.7.2</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.feng.mybatis</groupId>
	<artifactId>springboot_mybatis</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>springboot_mybatis</name>
	<description>springboot_mybatis</description>
	<properties>
		<java.version>1.8</java.version>
	</properties>
	<dependencies>

        <!-- mybatis-springboot-starter-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.2.2</version>
        </dependency>

        <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>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>

2. 版本对应

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3. 编写application.yml配置文件

a、添加配置

# 整合mybatis
mybatis:
  type-aliases-package: com.feng.springboot_mybatis.bean # 给pojo实体类起别名
  mapper-locations: classpath:mybatis/mapper/*.xml # 接口的配置文件的位置 我这里接口配置文件是UserMapper.xml

b、全部配置

spring:
  datasource:
    username: root
    password: 123456
    #?serverTimezone=UTC解决时区的报错
    url: jdbc:mysql://IP:3306/feng?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8
    driver-class-name: com.mysql.cj.jdbc.Driver

# 整合mybatis
mybatis:
  type-aliases-package: com.feng.springboot_mybatis.bean # 给pojo实体类起别名
  mapper-locations: classpath:mybatis/mapper/*.xml # 接口的配置文件的位置 我这里接口配置文件是UserMapper.xml

4. 总结

到此结束，springboot整合mybatis的环境已经搭建好了，即：基础框架就已经搭建好了，直接开始进行案例的操作就可以了。

三、测试案例

1. 项目整体结构（全）

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2. bean包下的实体类UserData

package com.feng.springboot_mybatis.bean;


public class UserData {
    private Integer user_id;
    private String user_name;
    private Integer gender;
    private String birthday;
    private String total_traval_road;
    private String total_traval_time;

    public UserData(Integer user_id, String user_name, Integer gender, String birthday, String total_traval_road, String total_traval_time) {
        this.user_id = user_id;
        this.user_name = user_name;
        this.gender = gender;
        this.birthday = birthday;
        this.total_traval_road = total_traval_road;
        this.total_traval_time = total_traval_time;
    }

    public Integer getUser_id() {
        return user_id;
    }

    public void setUser_id(Integer user_id) {
        this.user_id = user_id;
    }

    public String getUser_name() {
        return user_name;
    }

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

    public Integer getGender() {
        return gender;
    }

    public void setGender(Integer gender) {
        this.gender = gender;
    }

    public String getBirthday() {
        return birthday;
    }

    public void setBirthday(String birthday) {
        this.birthday = birthday;
    }

    public String getTotal_traval_road() {
        return total_traval_road;
    }

    public void setTotal_traval_road(String total_traval_road) {
        this.total_traval_road = total_traval_road;
    }

    public String getTotal_traval_time() {
        return total_traval_time;
    }

    public void setTotal_traval_time(String total_traval_time) {
        this.total_traval_time = total_traval_time;
    }

    @Override
    public String toString() {
        return super.toString();
    }
}

3. 编写接口UserDataMapper

package com.feng.springboot_mybatis.mapper;

import com.feng.springboot_mybatis.bean.UserData;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;

import java.util.List;

@Mapper
public interface UserDataMapper {

    List<UserData> queryUserList();

    UserData queryUserById(int id);

    int addUser(UserData user);

    int updateUser(UserData user);

    int deleteUser(int id);
}

4. 编写接口实现配置文件UserDataMapper.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.feng.springboot_mybatis.mapper">
    <select id="queryUserDataList" resultType="UserData">
        select * from feng.user_data
    </select>
    <select id="queryUserById" resultType="UserData">
        select *
        from feng.user_data
        where id=#{id};
    </select>
    <insert id="addUser" parameterType="UserData">
        insert into
        feng.user_data(id,name,pwd)
        values(#{id},#{name},#{pwd});
    </insert>
    <update id="updateUser" parameterType="UserData">
        update feng.user_data
        set name=#{name},pwd=#{pwd}
        where id=#{id};
    </update>
    <delete id="deleteUser" parameterType="int">
        delete
        from feng.user_data
        where id=#{id};
    </delete>
</mapper>

5. 编写contoller

package com.feng.springboot_mybatis.controller;

import com.feng.springboot_mybatis.bean.UserData;
import com.feng.springboot_mybatis.mapper.UserDataMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
public class UserDataController {

@Autowired
private UserDataMapper userMapper;

    @GetMapping("/queryUserList")
    public List<UserData> queryUserList(){
        List<UserData> userList = userMapper.queryUserList();

        for(UserData user:userList){
            System.out.println(user);
        }
        return userList;
    }

    @GetMapping("/queryUserById")
    public UserData queryUserById(){
        UserData user = userMapper.queryUserById(1);
        return user;
    }

    @GetMapping("/addUser")
    public String addUser(){
        userMapper.addUser(new UserData(2,"阿毛",1,"20220712","12", "23"));
        return "添加成功";
    }

    @GetMapping("/updateUser")
    public String updateUser(){
        userMapper.updateUser(new UserData(1,"秃驴",1, "20220723", "22", "23"));
        return "更改成功";
    }

    @GetMapping("/deleteUser")
    public String deleteUser(){
        userMapper.deleteUser(1);
        return "删除成功";
    }
}

至此，springboot整合mybatis 并且进行增删改查操作就全部结束了。

四、请求测试

1、查询

2、添加

3、更新

4、删除

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