Spring Boot Mysql 数据库操作

本文默认你的开发环境.数据库已经安装好

想用使用数据库.我们需要现在pom文件中添加相应的依赖

pom.xml

	4.0.0

	com.imgod
	testjpa
	0.0.1-SNAPSHOT
	war

	TestJpa
	Demo project for Spring Boot

	
		org.springframework.boot
		spring-boot-starter-parent
		1.4.2.RELEASE
		 
	

	
		UTF-8
		UTF-8
		1.8
	

	
		
			org.springframework.boot
			spring-boot-starter-data-jpa
		
		
			org.springframework.boot
			spring-boot-starter-web
		

		
			org.springframework.boot
			spring-boot-starter-tomcat
			provided
		
		
			org.springframework.boot
			spring-boot-starter-test
			test
		
		
			mysql
			mysql-connector-java
		
		
			org.springframework.boot
			spring-boot-starter-jdbc
		
		
		
			org.hibernate
			hibernate-core
		
	

	
		
			
				org.springframework.boot
				spring-boot-maven-plugin
			
		
	

我们的配置文件进行数据库的配置

application.properties:

spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test
spring.datasource.username=root
spring.datasource.password=imgod1
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.jpa.properties.hibernate.hbm2ddl.auto=update

前面配置的是数据库信息,最后一行配置的是.如果我们定义的实体在数据库中没有对应的表的话.会帮我们自动创建

我们的实体类型

User.java

package com.imgod.bean;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.validation.constraints.NotNull;

@Entity
@Table(name = "users")
public class User {
	@Id
	@GeneratedValue(strategy = GenerationType.AUTO)
	private int id;
	@NotNull
	private String email;
	@NotNull
	private String name;

	public int getId() {
		return id;
	}

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

	public String getEmail() {
		return email;
	}

	public void setEmail(String email) {
		this.email = email;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

}

对应数据库中的user表,没有的话会自动创建

想对数据库进行操作,我们需要创建一个接口继承CrudRepository

UserDao.java

package com.imgod.dao;

import org.springframework.data.domain.Pageable;
import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;

import com.imgod.bean.User;
import java.lang.String;
import java.util.List;

@Transactional
@Repository
public interface UserDao extends CrudRepository {
	//jpa 方法名就是查询语句,只要规法写方法名一切就都可以完成(当然.有时候会造成方法名又臭又长)
	User findByEmail(String email);//根据邮箱查询
	List findByName(String name);//根据用户名查询
	
	//select * from test.users where email='[email protected]' and name='imgod';
	List findByNameAndEmail(String name,String email);//根据用户名和邮箱进行查询
	
	//select * from test.users where email='[email protected]' and name='imgod4444' order by id desc;
	List findByNameAndEmailOrderByIdDesc(String name,String email);//根据用户名和邮箱进行查询,排序
	
	//select * from test.users where email='[email protected]' and name='imgod4444' order by id desc limit 2;
	List findTop2ByNameAndEmailOrderByIdDesc(String name,String email);//根据用户名和邮箱进行查询,排序,前两个

	//根据邮箱进行分页查询
	List findByEmail(String email,Pageable pageable);//根据用户名和邮箱进行查询
}

实现CrudRepository我们就可以对数据库进行一些基础操作了

如果我们想要实现更多的操作.需要自己按照严格的命名规则为方法定义方法名

下面就是我们重要的控制器的实现了:

package com.imgod.controller;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.PageRequest;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.imgod.bean.User;
import com.imgod.dao.UserDao;

@RestController
public class UserController {
	@Autowired
	private UserDao userDao;

	/**
	 * 根据邮件去查找
	 * 
	 * @param email
	 * @return
	 */
	@RequestMapping(value = "/findUserByEmail")
	public Object getUserByEmail(String email) {
		System.out.println("email:" + email);
		User user = userDao.findByEmail(email);
		if (null == user) {
			return "暂无数据";
		} else {
			return user;
		}

	}

	/**
	 * 获取所有的用户信息
	 * 
	 * @return
	 */
	@RequestMapping(value = "/getall")
	public Object getAllUser() {
		List list = (List) userDao.findAll();
		if (null == list || list.size() == 0) {
			return "暂无数据";
		} else {
			return list;
		}

	}

	/**
	 * 删除指定id用户
	 * 
	 * @param id
	 * @return
	 */
	@RequestMapping(value = "/deleteUser")
	public Object deleteuUser(int id) {
		User user = userDao.findOne(id);
		if (null == user) {
			return "删除用户失败:" + id + "没找到该用户";
		} else {
			userDao.delete(id);
			return "删除用户成功:" + id;
		}

	}

	/**
	 * 添加用户
	 * 
	 * @param id
	 * @param email
	 * @param name
	 * @return
	 */
	@RequestMapping(value = "/adduser")
	public Object addUser(String id, String email, String name) {
		System.out.println("email:" + email);

		int tempId = Integer.parseInt(id);
		System.out.println("tempId:" + tempId + "email:" + email + "name:" + name);

		User tempUser = userDao.findOne(tempId);
		if (null == tempUser) {
			tempUser = new User();
			tempUser.setId(tempId);
		}
		tempUser.setEmail(email);
		tempUser.setName(name);
		User resultUser = userDao.save(tempUser);
		if (null == resultUser) {
			return "新增用户失败";
		} else {
			return "新增用户:" + resultUser.getName();
		}

	}

	// 条件查询

	/**
	 * 获取姓名和邮箱是指定内容的用户
	 * 
	 * @return
	 */
	@RequestMapping(value = "/getUser1")
	public Object getUser(String email, String name) {
		List userList = userDao.findByNameAndEmail(name, email);
		if (null != userList && userList.size() != 0) {
			return userList;
		} else {
			return "没找到符合要求的用户";
		}

	}

	/**
	 * 获取姓名和邮箱是指定内容的用户并排序
	 * 
	 * @return
	 */
	@RequestMapping(value = "/getUser2")
	public Object getUser2(String email, String name) {
		List userList = userDao.findByNameAndEmailOrderByIdDesc(name, email);
		if (null != userList && userList.size() != 0) {
			return userList;
		} else {
			return "没找到符合要求的用户";
		}

	}

	/**
	 * 获取姓名和邮箱是指定内容的用户并排序,前两个
	 * 
	 * @return
	 */
	@RequestMapping(value = "/getUser3")
	public Object getUser3(String email, String name) {
		List userList = userDao.findTop2ByNameAndEmailOrderByIdDesc(name, email);
		if (null != userList && userList.size() != 0) {
			return userList;
		} else {
			return "没找到符合要求的用户";
		}

	}

	/**
	 * 分页获取邮箱为指定内容的数据
	 * 
	 * @return
	 */
	@RequestMapping(value = "/getUser4")
	public Object getUser4(String email, int page) {
		// page 属于下标 从0开始 0代表是第一页
		List userList = userDao.findByEmail(email, new PageRequest(page, 2));
		if (null != userList && userList.size() != 0) {
			return userList;
		} else {
			return "没找到符合要求的用户";
		}

	}
}

如此我们就完成了对数据库的操作:

完整代码地址:http://download.csdn.net/download/u010399316/9698797