SpringBoot实践之---JDBC连接数据库

JDBC 连接数据库

1、属性配置文件（application.properties）

spring.datasource.url=jdbc:mysql://localhost:3306/test
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

如果使用JNDI，则可以替代 spring.datasource 的 url、username、password，如：

spring.datasource.jndi-name=java:tomcat/datasources/example

1

值得一提的是，无论是Spring Boot默认的DataSource配置还是你自己的DataSource bean，都会引用到外部属性文件中的属性配置。所以假设你自定义的DataSource bean，你可以在定义bean时设置属性，也可以在属性文件中，以“spring.datasource.*”的方式使属性配置外部化。

2、pom.xml 配置maven依赖

<!-- MYSQL -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<!-- Spring Boot JDBC -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>

3、Java代码范例

StudentService.java

package org.springboot.sample.service;

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

import org.springboot.sample.entity.Student;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.stereotype.Service;

/**
* Studeng Service
*
* @author   单红宇(365384722)
* @myblog  http://blog.csdn.net/catoop/ * @create    2016年1月12日
*/
@Service
public class StudentService {

@Autowired
private JdbcTemplate jdbcTemplate;

public List<Student> getList(){
String sql = "SELECT ID,NAME,SCORE_SUM,SCORE_AVG, AGE   FROM STUDENT";
return (List<Student>) jdbcTemplate.query(sql, new RowMapper<Student>(){

@Override
public Student mapRow(ResultSet rs, int rowNum) throws SQLException {
Student stu = new Student();
stu.setId(rs.getInt("ID"));
stu.setAge(rs.getInt("AGE"));
stu.setName(rs.getString("NAME"));
stu.setSumScore(rs.getString("SCORE_SUM"));
stu.setAvgScore(rs.getString("SCORE_AVG"));
return stu;
}

});
}
}

Student.java 实体类

package org.springboot.sample.entity;

import java.io.Serializable;

/**
* 学生实体
*
* @author   单红宇(365384722)
* @myblog  http://blog.csdn.net/catoop/ * @create    2016年1月12日
*/
public class Student implements Serializable{

private static final long serialVersionUID = 2120869894112984147L;

private int id;
private String name;
private String sumScore;
private String avgScore;
private int age;

// 节省文章长度，get set 方法省略
}

StudentController.java

package org.springboot.sample.controller;

import java.util.List;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springboot.sample.entity.Student;
import org.springboot.sample.service.StudentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/stu")
public class StudentController {

private static final Logger logger = LoggerFactory.getLogger(StudentController.class);

@Autowired
private StudentService studentService;

@RequestMapping("/list")
public List<Student> getStus(){
logger.info("从数据库读取Student集合");
return studentService.getList();
}
}

本文对工程添加文件后工程结构图：

这里写图片描述



然后启动项目，访问地址： http://localhost:8080/myspringboot/stu/list 响应结果如下：

[

{

id: 1,

name: “小明”,

sumScore: “252”,

avgScore: “84”,

age: 1

},

{

id: 2,

name: “小王”,

sumScore: “187”,

avgScore: “62.3”,

age: 1

},

{

id: 3,

name: “莉莉”,

sumScore: “”,

avgScore: “”,

age: 0

},

{

id: 4,

name: “柱子”,

sumScore: “230”,

avgScore: “76.7”,

age: 1

},

{

id: 5,

name: “大毛”,

sumScore: “”,

avgScore: “”,

age: 0

},

{

id: 6,

name: “亮子”,

sumScore: “0”,

avgScore: “0”,

age: 1

}

]