SpringBoot(7):Jdbc链接数据库

SpringBoot JDBC 数据库连接

最新推荐文章于 2024-06-13 21:16:52 发布

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本文介绍如何使用SpringBoot和JDBC连接MySQL数据库，并通过示例代码演示了配置属性文件、添加Maven依赖及实现数据库查询的过程。

Jdbc连接数据库

使用SpringBoot连接mySQL数据库有很多种方式，本文将使用JDBC去实现。

1.首先是属性配置文件

application.yml

spring:
  datasource:
    url: jdbc:mysql://localhost:3306/girl
    username: root
    password: 
    driver-class-name: com.mysql.jdbc.Driver

2.添加pom.xml的依赖

<?xml version="1.0" encoding="UTF-8"?>
<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.springboot</groupId>
	<artifactId>study</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>war</packaging>

	<name>SpringBoot-JDBC</name>
	<description>Demo project for Spring Boot</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.9.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.7</java.version>
	</properties>

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

		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<scope>runtime</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-tomcat</artifactId>
			<scope>provided</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>


</project>

3.代码实例

首先我们先完成Service层的代码，这一部分主要是使用JdbcTemplate来进行数据库操作，下面以查询为例：

package com.springboot.study.service;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.stereotype.Service;

import com.springboot.study.entity.Girl;

@Service
public class GirlService {
	
	
	@Autowired
	private JdbcTemplate jdbcTemplate;
	
	public List<Girl> getGirlList(){
		String sql="select *from girl";
		return jdbcTemplate.query(sql, new RowMapper<Girl>(){
			@Override
			public Girl mapRow(ResultSet rs, int rowNum) throws SQLException {
				Girl girl=new Girl();
				girl.setId(rs.getInt("id"));
				girl.setAge(rs.getInt("age"));
				girl.setCup_size(rs.getString("cup_size"));
				return girl;
			}
		});
	}
	
}

然后是实体类：

Girl.java

package com.springboot.study.entity;

public class Girl {
	
	private int id;
	
	private int age;
	
	private String cup_size;

	public Girl(int id, int age, String cup_size) {
		super();
		this.id = id;
		this.age = age;
		this.cup_size = cup_size;
	}

	public Girl() {
		super();
	}

	public int getId() {
		return id;
	}

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

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

	public String getCup_size() {
		return cup_size;
	}

	public void setCup_size(String cup_size) {
		this.cup_size = cup_size;
	}

	@Override
	public String toString() {
		return "Girl [id=" + id + ", age=" + age + ", cup_size=" + cup_size + "]";
	}
}

再然后就是Controller的编写

MyController.java

package com.springboot.study.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.springboot.study.entity.Girl;
import com.springboot.study.service.GirlService;

@RestController
public class MyController {
	
	@Autowired
	private GirlService girlService;
	
	@RequestMapping("/girls")
	public List<Girl> getGirl(){
		return girlService.getGirlList();
	}
}

点击： http://localhost:8080/girls便可查询到数据

结果如下：