SpringBoot连接linux中的mysql（保姆级详解）

第一步

新建springBoot文件

第二步

勾选配置

第三步

选中pom文件 删除junit

添加pom依赖

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId></dependency>
<?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>
    <groupId>kh100</groupId>
    <artifactId>linux0204</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>linux0204</name>
    <description>linux0204</description>

    <properties>
        <java.version>1.8</java.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <spring-boot.version>2.3.7.RELEASE</spring-boot.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.72</version>
        </dependency>
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.6</version>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring-boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement></project>

第四步

右键父模块 新建module

第五步

选择子目录下的pom

添加5个依赖 其中 mysql-connector-java 版本为5.1.38

mybatis-spring-boot-starter 版本为1.3.2

<?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">
    <parent>
        <artifactId>linux0204</artifactId>
        <groupId>kh100</groupId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>linux0204-dbmodule</artifactId>

    <name>linux0204-dbmodule</name>
    <!-- FIXME change it to the project's website -->
    <url>http://www.example.com</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.7</maven.compiler.source>
        <maven.compiler.target>1.7</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.38</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
        </dependency>
    </dependencies></project>

第六步

创建 pojo mapper  DbModuleApplication resource

pojo

package com.kgc.secondpro.dbmodel.pojo;import lombok.AllArgsConstructor;import lombok.Builder;import lombok.Data;import lombok.NoArgsConstructor;@Data@AllArgsConstructor@NoArgsConstructor@Builderpublic class Userinfos {    private Integer userid;    private String usernaeme;    private String birthday;
}
mapper

package com.kgc.secondpro.dbmodel.mapper;import com.kgc.secondpro.dbmodel.pojo.Userinfos;import org.apache.ibatis.annotations.Mapper;import org.springframework.stereotype.Repository;import java.util.List;

@Mapper@Repository
public interface IUserMapper {    List<Userinfos> findAll();
}
application

package com.kgc.secondpro.dbmodel;import org.mybatis.spring.annotation.MapperScan;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication@MapperScan("com.kgc.secondpro.dbmodel.mapper")public class DbModuleApplication {    public static void main(String[] args) {
        SpringApplication.run(DbModuleApplication.class,args);
    }
}

resource下的

mapper

<?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.kgc.secondpro.dbmodel.mapper.IUserMapper">
    <select id="findAll" resultType="user">
        select userid,username,birthday from userinfos    </select></mapper>

application.yml

server:  port: 9001spring:  datasource:    driver-class-name: com.mysql.jdbc.Driver    url: jdbc:mysql://192.168.64.188:3306/mydemo
    username: root    password: okmybatis:  config-location: classpath:mybatis.cfg.xml  mapper-locations: classpath:mapper/*.xml

mybatis.cfg.xml 起别名

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd"><configuration>
    <typeAliases>
        <typeAlias type="com.kgc.secondpro.dbmodel.pojo.Userinfos" alias="user"/>
    </typeAliases></configuration>

第七步

编写测试类

package com.kgc.secondpro.dbmodel.test;import com.kgc.secondpro.dbmodel.mapper.IUserMapper;import org.junit.jupiter.api.Test;import org.springframework.boot.test.context.SpringBootTest;import javax.annotation.Resource;

@SpringBootTestpublic class DbTest {
    @Resource
    private IUserMapper userMapper; ;
    @Test
    public void test(){        System.out.println(userMapper.findAll());
    }
}

输出结果

finalShell中的mysql配置