spring boot快速配置连接数据库mysql

使用idea快速构建springboot 配置MySQL连接

思路如下:
1、build.gradle==>配置系统导入包
2、application.priperties==>配置连接mysql数据库信息
3、bean=>定义数据类型
4、mapper==>定义接口类型
5、controller==>调用接口，返回页面
6、html==>页面设定

构建

idea–>file–>objdec–new Project–>spring Initializr–>查看下图操作–>无图就下一步

使用spring Initialiar 自动构建项目，使用SDK1.8创建

配置组和名称（随意）
选择构建方式为:Gradle Project

选择项目初始化的信息

文件：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'
    }

}

二 、连接mysql配置

全部构建完文件结构如下：

步骤2，文件：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

步骤3 数据类型: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;
    }
}

步骤4 定义接口：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);
}

步骤5调用接口，返回页面。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);
    }
}

步骤6页面设置（略）
使用浏览器，打开网址：localhost:8080/depart/1
从数据库读取数据，页面返回信息