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

<?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/testspring.datasource.username=rootspring.datasource.password=imgod1spring.datasource.driver-class-name=com.mysql.jdbc.Driverspring.datasource.max-idle=10spring.datasource.max-wait=10000spring.datasource.min-idle=5spring.datasource.initial-size=5spring.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;@NotNullprivate String email;@NotNullprivate 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@Repositorypublic 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='[e-mail]' 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='[e-mail]' 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='[e-mail]' 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;@RestControllerpublic class UserController {@Autowiredprivate 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:

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