Spring boot quick configuration to connect to the database mysql

Use idea to quickly build springboot to configure MySQL connection

The idea is as follows:
1. build.gradle==> configure system import package
2. application.priperties==> configure connection mysql database information
3. bean=> define data type
4, mapper==> define interface type
5, controller== >Call the interface, return to page
6, html==>page setting

Construct

idea–>file–>objdec–new Project–>spring Initializr–>View the following figure operation–>If there is no figure, then the next step

Use spring Initialiar to automatically build the project, use SDK1.8 to create the

configuration group and name (optional),
select the build method: Gradle Project,

select the information for project initialization

File: build.gradle

plugins {
    
    
    id 'org.springframework.boot' version '2.3.0.RELEASE'
    id 'io.spring.dependency-management' version '1.0.9.RELEASE'
    id 'java'
}

group = 'com.spboot'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '1.8'

repositories {
    
    
    mavenCentral()
}

//加载的项目包文件
dependencies {
    
    
    implementation 'org.springframework.boot:spring-boot-starter-data-jdbc'
    implementation 'org.springframework.boot:spring-boot-starter-web'
    implementation 'org.mybatis.spring.boot:mybatis-spring-boot-starter:2.1.3'
    runtimeOnly 'mysql:mysql-connector-java'
    testImplementation('org.springframework.boot:spring-boot-starter-test') {
    
    
        exclude group: 'org.junit.vintage', module: 'junit-vintage-engine'
    }

}

Two, connect to mysql configuration

The file structure after all construction is as follows:

Step 2, File: application.properties

#配置端口
server.port=8080
#配置数据库
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.url=jdbc:mysql://192.168.188.129:3307/mybatis?useSSL=false

Step 3 Data type: Department

package com.spboot.spbuildmysql.bean;

public class Department {
    
    
	//定义数据类型，设定set,get方法
    private Integer id;
    private String departmentName;

    public Integer getId() {
    
    
        return id;
    }

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

    public String getDepartmentName() {
    
    
        return departmentName;
    }

    public void setDepartmentName(String departmentName) {
    
    
        this.departmentName = departmentName;
    }
}

Step 4 Define the interface: DepartmentMapper

package com.spboot.spbuildmysql.mapper;

import com.spboot.spbuildmysql.bean.Department;
import org.apache.ibatis.annotations.*;

@Mapper //扫描接口
public interface DepartmentMapper {
    
    

    @Select("select * from department where id=#{id}")
    public Department getDeptById(Integer id);
}

Step 5 Call the interface and return to the page. DepartController

package com.spboot.spbuildmysql.controller;

import com.spboot.spbuildmysql.bean.Department;
import com.spboot.spbuildmysql.mapper.DepartmentMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

@RestController  //注解后可以使用浏览器直接访问。
public class DepartController {
    
    

	//自动注入，接口导入
    @Autowired 
    DepartmentMapper departmentMapper;  

	//构建返回页面,使用浏览器打开
    @GetMapping("/depart/{id}")
    public Department getDepartment(@PathVariable Integer id){
    
    
        return departmentMapper.getDeptById(id);
    }
}

Step 6 Page settings (omitted)
Use a browser to open the website: localhost:8080/depart/1
to read data from the database, and the page returns information