1.springBoot 连接mysql概述
- 配置
application.properties
- 配置 maven 依赖
- 创建数据表,代码测试
2. 配置application.properties
#datasources config
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
spring.datasource.max-idle=10
spring.datasource.max-wait=10000
spring.datasource.min-idle=5
spring.datasource.initial-size=5
spring.datasource.validation-query=SELECT 1
spring.datasource.test-on-borrow=false
spring.datasource.test-while-idle=true
spring.datasource.time-between-eviction-runs-millis=18800
spring.datasource.jdbc-interceptors=ConnectionState;SlowQueryReport(threshold=0)
3.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>
<!--spring tran -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>4.3.14.RELEASE</version>
</dependency>
4.代码如下
- 实体类
package com.example.demo.entity;
import java.io.Serializable;
public class User implements Serializable{
/**
*
*/
private static final long serialVersionUID = -1369148652554782331L;
private int id;
private String name;
private int age;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
- dao 层
package com.example.demo.dao;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;
import javax.annotation.Resource;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.stereotype.Repository;
import com.example.demo.entity.User;
@Repository
public class UserDao {
@Resource
private JdbcTemplate jdbcTemplate;
public List<User> getUserList(){
String sql = "select * from user";
return jdbcTemplate.query(sql, new RowMapper<User>() {
@Override
public User mapRow(ResultSet rs, int rowNum) throws SQLException {
User user = new User();
user.setAge(rs.getInt("age"));
user.setId(rs.getInt("id"));
user.setName(rs.getString("name"));
return user;
}
});
}
}
- service 层
package com.example.demo.service;
import java.util.List;
import javax.annotation.Resource;
import org.springframework.stereotype.Service;
import com.example.demo.dao.UserDao;
import com.example.demo.entity.User;
@Service
public class UserService {
@Resource
private UserDao userDao;
public List<User> getUserList(){
return userDao.getUserList();
}
}
- contoller 层
package com.example.demo.controller;
import java.util.List;
import javax.annotation.Resource;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.example.demo.entity.User;
import com.example.demo.service.UserService;
@RestController
public class UserController {
@Resource
private UserService userService;
@RequestMapping(value = "/user")
public Object index() {
List<User> list = userService.getUserList();
return list;
}
}
5.表结构
6.结果
完!