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Spring是什么呢?首先它是一个开源的项目,而且目前非常活跃;它是一个基于IOC和AOP的构架多层j2ee系统的框架,但它不强迫你必须在每一层 中必须使用Spring,因为它模块化的很好,允许你根据自己的需要选择使用它的某一个模块;它实现了很优雅的MVC,对不同的数据访问技术提供了统一的接口,采用IOC使得可以很容易的实现bean的装配,提供了简洁的AOP并据此实现Transcation Managment,等等
本篇文章主要介绍了Spring Boot Mysql 数据库操作示例,小编觉得挺不错的,现在分享给大家,也给大家做个参考。一起跟随小编过来看看吧
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
- <?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.imgod</groupId>
- <artifactId>testjpa</artifactId>
- <version>0.0.1-SNAPSHOT</version>
- <packaging>war</packaging>
- <name>TestJpa</name>
- <description>Demo project for Spring Boot</description>
- <parent>
- <groupId>org.springframework.boot</groupId>
- <artifactId>spring-boot-starter-parent</artifactId>
- <version>1.4.2.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>1.8</java.version>
- </properties>
- <dependencies>
- <dependency>
- <groupId>org.springframework.boot</groupId>
- <artifactId>spring-boot-starter-data-jpa</artifactId>
- </dependency>
- <dependency>
- <groupId>org.springframework.boot</groupId>
- <artifactId>spring-boot-starter-web</artifactId>
- </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>
- <dependency>
- <groupId>mysql</groupId>
- <artifactId>mysql-connector-java</artifactId>
- </dependency>
- <dependency>
- <groupId>org.springframework.boot</groupId>
- <artifactId>spring-boot-starter-jdbc</artifactId>
- </dependency>
- <!-- 添加Hibernate依赖 -->
- <dependency>
- <groupId>org.hibernate</groupId>
- <artifactId>hibernate-core</artifactId>
- </dependency>
- </dependencies>
- <build>
- <plugins>
- <plugin>
- <groupId>org.springframework.boot</groupId>
- <artifactId>spring-boot-maven-plugin</artifactId>
- </plugin>
- </plugins>
- </build>
- </project>
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<User, Integer> {
- //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<User> findByName(String name);//根据用户名查询
- //select * from test.users where email='imgod@qq.com' and name='imgod';
- List<User> findByNameAndEmail(String name,String email);//根据用户名和邮箱进行查询
- //select * from test.users where email='imgod@qq.com' and name='imgod4444' order by id desc;
- List<User> 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='imgod@qq.com' and name='imgod4444' order by id desc limit 2;
- List<User> 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<User> 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 < User > list = (List < User > ) 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 < User > 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 < User > 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 < User > 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 < User > 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:
来源: http://www.phperz.com/article/17/1128/358263.html