使用sprintboot框架访问mysql数据库

项目结构如图所示：

一、新建Maven工程，如不熟悉可参考 https://blog.csdn.net/qiaojianfang_1148/article/details/80050684

1、在pom.xml引入SpringBoot的依赖包！

<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.yx</groupId>
<artifactId>springboot_hello</artifactId>
<version>0.0.1-SNAPSHOT</version>

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.1.RELEASE</version>
</parent>

<properties>
<java.version>1.8</java.version>
</properties>

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

<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.0.0</version>
</dependency>
</dependencies>

</project>

2、在配置文件中添加配置信息：

如：

mysql -u root -p

则写成这样：

spring.datasource.username=root

spring.datasource.password=

//======================================================

以下内容修改红色部分为自己的配置：

spring.datasource.url=jdbc:mysql://127.0.0.1:3306/修改为自己的数据库名称
spring.datasource.username=数据库登录账号
spring.datasource.password=数据库登录密码

spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.max-idle=10
spring.datasource.max-wait=10000
spring.datasource.min-idle=5
spring.datasource.initial-size=5

server.port=8080
server.session.timeout=10
server.tomcat.uri-encoding=UTF-8
# mybatis.config= classpath:mybatis-config.xml
mybatis.mapperLocations=classpath:mappers/*.xml
# domain object's package
# mybatis.typeAliasesPackage=com.yx.springboot_hello.model
# handler's package
# mybatis.typeHandlersPackage=
# check the mybatis configuration exists
# mybatis.check-config-location=
# mode of execution. Default is SIMPLE
# mybatis.executorType=

3、依次添加mapper的接口类和xml文件

1）在src/main/java中添加mapper类

package com.yx.springboot_mybatis.mapper;

import java.util.List;
import com.yx.springboot_mybatis.model.User;
public interface EmpMapper {
List<User> selectAll();

}

2）在src/main/resources 新建mappers文件夹：

<?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.yx.springboot_mybatis.mapper.EmpMapper" >
<resultMap id="BaseResultMap" type="com.yx.springboot_mybatis.model.User" >
<id column="emp_id" property="emp_id" jdbcType="INTEGER" />
<result column="loginname" property="loginname" jdbcType="VARCHAR" />
<result column="telephone" property="telephone" jdbcType="VARCHAR" />
</resultMap>
<sql id="Base_Column_List" >
emp_id, loginname, telephone
</sql>
<select id="selectAll" resultMap="BaseResultMap" parameterType="java.lang.String" >
select
<include refid="Base_Column_List" />
from emp
</select>
</mapper>

这里面的内容都要根据实际情况进行修改

Ｕser 类：

package com.yx.springboot_mybatis.model;

//user的变量名必须跟mapper中的字段一一对应
public class User {
private int emp_id;
private String loginname;
private String telephone;
public int getEmp_id() {
return emp_id;
}
public void setEmp_id(int emp_id) {
this.emp_id = emp_id;
}
public String getLoginname() {
return loginname;
}
public void setLoginname(String loginname) {
this.loginname = loginname;
}
public String getTelephone() {
return telephone;
}
public void setTelephone(String telephone) {
this.telephone = telephone;
}

}

Service类：

package com.yx.springboot_mybatis.service;

import java.util.ArrayList;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.yx.springboot_mybatis.mapper.EmpMapper;
import com.yx.springboot_mybatis.model.User;

@Service
public class EmpService {
@Autowired
private EmpMapper mapper;

public List<User> getUsers(){
List<User> list = new ArrayList<User>();
list = mapper.selectAll();
return list;
}

}

Ｃontroller类：

package com.yx.springboot_mybatis.controller;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.yx.springboot_mybatis.model.User;
import com.yx.springboot_mybatis.service.EmpService;

@RestController
@RequestMapping("/emp")
public class EmpController {
@Autowired
private EmpService service;

@RequestMapping("/getAll")
public List<User> getAllMessage(){
List<User> list = service.getUsers();
return list;
}

}

启动类：

package com.yx.springboot_mybatis;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class App {
//启动类
public static void main(String[] args) {
SpringApplication.run(App.class, args);
}

}

运行启动类，成功启动spring boot自带的tomcat，在浏览中输入：

http://localhost:8080/emp/getAll

如需要下载源码，请访问：https://download.csdn.net/download/qiaojianfang_1148/10368246

使用sprintboot框架访问mysql数据库

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