Spring Boot Mysql 数据库操作示例

<?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> 

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 

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;   }  } 

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 } 

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";     }    } }