SpringBoot封装JDBC的实现步骤

Spring Boot中可以在配置文件中直接进行数据库配置，

spring.datasource.username= rootspring.datasource.password= 123456spring.datasource.url=jdbc:mysql://localhost:3306/mybatis?useUnicode=true&characterEncoding=utf-8spring.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;@SpringBootTestclass 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;@RestControllerpublic 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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