详解SpringBoot封装使用JDBC

spring boot中可以在配置文件中直接进行数据库配置，

spring.datasource.username= root
spring.datasource.password= 123456
spring.datasource.url=jdbc:mysql://localhost:3306/mybatis?useunicode=true&characterencoding=utf-8
spring.datasource.driver-class-name=com.mysql.cj.jdbc.driver

springboot可以直接生成数据库对象
默认数据源为hikari

jdbc连接

import org.junit.jupiter.api.test;
import org.springframework.beans.factory.annotation.autowired;
import org.springframework.boot.test.context.springboottest;

import javax.sql.datasource;
import java.sql.connection;
import java.sql.sqlexception;

@springboottest
class dataspringbootapplicationtests {

    @autowired
    datasource datasource;
    @test
    void contextloads() throws sqlexception {
        system.out.println("默认数据源");
        system.out.println(datasource.getclass());
        system.out.println("获得数据库连接");
        connection connection = datasource.getconnection();
        system.out.println(connection);

        system.out.println("关闭数据源");
        connection.close();


    }

}

springboot中有很多template已经写好可以直接拿来用

import org.springframework.beans.factory.annotation.autowired;
import org.springframework.jdbc.core.jdbctemplate;
import org.springframework.web.bind.annotation.getmapping;
import org.springframework.web.bind.annotation.pathvariable;
import org.springframework.web.bind.annotation.restcontroller;

import java.util.list;
import java.util.map;
@restcontroller
public class jdbccontroller {
    @autowired
    jdbctemplate jdbctemplate;
    //查询数据库所有信息
    @getmapping("/userlist")
    public list<map<string,object>> userlist(){
        string sql = "select * from user";
        list<map<string, object>> maplist = jdbctemplate.queryforlist(sql);
        return  maplist;
    }
    @getmapping("/adduser")
    public string adduser(){
        string sql = "insert into mybatis.user(id,name,pwd) values (4,'hhh','451651')";
        jdbctemplate.update(sql);
        return "update-ok";
    }
    @getmapping("/deleteuser/{id}")
    public string deleteuser(@pathvariable("id") int id){
        string sql = "delete from mybatis.user where id = ?";
        jdbctemplate.update(sql,id);
        return "delete-ok";
    }
}

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