Spring Boot—15SpringJPA

pom.xml

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>8.0.11</version>
</dependency>
<dependency>
   <groupId>com.alibaba</groupId>
   <artifactId>druid-spring-boot-starter</artifactId>
   <version>1.1.9</version>
</dependency>

application.properties

#
server.address=0.0.0.0
server.port=8080
server.servlet.context-path=/test

server.session.timeout=300
server.error.path=/error
# Tomcat的访问日志，便于进行用户访问日志分析
server.tomcat.accesslog.enabled=true
server.tomcat.accesslog.buffered=true
server.tomcat.accesslog.directory=D:/Project/JavaWeb/SpringBoot/04JPASpringBoot/logs
# JSON解析的配置
spring.jackson.date-format=yyyy-MM-dd HH:mm:ss

spring.jackson.time-zone=Asia/Shanghai

#
spring.thymeleaf.cache=true
spring.thymeleaf.enabled=true
# 文件上传配置
file.upload.path=D:/Project/JavaWeb/SpringBoot/04JPASpringBoot/fileUpLoad

spring.servlet.multipart.enabled=true
spring.servlet.multipart.file-size-threshold=0
spring.servlet.multipart.location=D:/Project/JavaWeb/SpringBoot/04JPASpringBoot/temp
spring.servlet.multipart.max-file-size=10MB
spring.servlet.multipart.max-request-size=10MB
spring.servlet.multipart.resolve-lazily=false

spring.datasource.type=com.alibaba.druid.pool.DruidDataSource

# MySQL新的连接字符串（加了时区）

spring.datasource.druid.one.url=jdbc:mysql://127.0.0.1:3306/test?serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=utf8&useSSL=false

spring.datasource.druid.one.username=root
spring.datasource.druid.one.password=gis

# MySQL新的驱动
spring.datasource.druid.one.driver-class-name=com.mysql.cj.jdbc.Driver

##Druid
spring.datasource.druid.one.initial-size=2
spring.datasource.druid.one.max-active=5
spring.datasource.druid.one.min-idle=1
spring.datasource.druid.one.max-wait=60000
spring.datasource.druid.one.pool-prepared-statements=true
spring.datasource.druid.one.max-pool-prepared-statement-per-connection-size=20
spring.datasource.druid.one.validation-query=SELECT 1 FROM DUAL
spring.datasource.druid.one.validation-query-timeout=60000
spring.datasource.druid.one.test-on-borrow=false
spring.datasource.druid.one.test-on-return=false
spring.datasource.druid.one.test-while-idle=true
spring.datasource.druid.one.time-between-eviction-runs-millis=60000
spring.datasource.druid.one.min-evictable-idle-time-millis=100000
#spring.datasource.druid.one.max-evictable-idle-time-millis=
spring.datasource.druid.one.filters=stat,wall,log
spring.datasource.druid.one.logSlowSql=true

数据库连接池的配置

package com.smartmap.sample.test.conf;

import javax.sql.DataSource;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;

import com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceBuilder;

@Configuration
public class DataSourceConfiguration {

    private final Log logger = LogFactory.getLog(DataSourceConfiguration.class);

    @Primary
    @Bean
    @ConfigurationProperties("spring.datasource.druid.one") # 这样配置可以支持后面的多数据源的情况

public DataSource getDataSourceConfiguration() {
        return DruidDataSourceBuilder.create().build();
    }
}

强大的JpaRepository

package com.smartmap.sample.test.dao;

import java.util.Date;
import java.util.List;
import java.util.Set;

import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Modifying;
import org.springframework.data.jpa.repository.Query;

import com.smartmap.sample.test.entity.User;

public interface UserRepository extends JpaRepository<User, Long> {
    // 基于Spring的方法名字查询
    public User findByName(String name);

    public List<User> findByCreateTimeGreaterThan(Date createTime);

    // JPQL 查询
    @Query(value="select u from user u where u.name=?1 and u.department.id=?2", nativeQuery=true)
    public User findUser(String name, Long departmentId);

    // JPQA + 命名
    @Query(value="select u from user u where u.name=:name and u.department.id=:departmentId", nativeQuery=true)
    public User findUser2(String name, Long departmentId);

    // SQL 查询
    @Query(value="select id, name, create_time, department_id from user where name=:name and department_id=:departmentId", nativeQuery=true)
    public User findUserNativeQuery2(String name, Long departmentId);

    // SQL + 命名
    @Query(value="select department_id, count(*) count from user group by department_id", nativeQuery= true)
    public List<Object[]> queryUserCount();

    // 分页配合使用
    @Query(value="select u from user u where u.department.id=?1", nativeQuery=true)
    public Page<User> queryUsers(Long departmentId, Pageable page);

    // 修改
    @Modifying
    @Query("update User u set u.name=?1 where u.id=?2")
    public int updateName(String name, Long id);

}

实体User

package com.smartmap.sample.test.entity;

import java.util.Date;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;

import com.fasterxml.jackson.annotation.JsonBackReference;

@Entity
public class User {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @Column
    private String name;

    @JsonBackReference // 防止相互引用，出现无限引用递归
    @ManyToOne
    @JoinColumn(name = "department_id")
    private Department department;

    @Column(name = "create_time")
    private Date createTime;

    public User() {
    }

    public User(Long id, String name, Department department, Date createTime) {
        super();
        this.id = id;
        this.name = name;
        this.department = department;
        this.createTime = createTime;
    }

    public Long getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

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

    public Department getDepartment() {
        return department;
    }

    public void setDepartment(Department department) {
        this.department = department;
    }

    public Long getDepartmentId() {
        return this.department == null ? null : this.department.getId();
    }

    public void setDepartmentId(Long departmentId) {
        if (this.department != null) {
            this.department.setId(departmentId);
        }
    }

    public Date getCreateTime() {
        return createTime;
    }

    public void setCreateTime(Date createTime) {
        this.createTime = createTime;
    }

}

实体Department

package com.smartmap.sample.test.entity;

import java.util.HashSet;
import java.util.Set;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToMany;

import com.fasterxml.jackson.annotation.JsonManagedReference;

@Entity
public class Department {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @Column
    private String name;

    @JsonManagedReference // 防止相互引用，出现无限引用递归
    @OneToMany(mappedBy = "department")
    private Set<User> users = new HashSet<User>();

    public Long getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

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

    public Set<User> getUsers() {
        return users;
    }

    public void setUsers(Set<User> users) {
        this.users = users;
    }

}

Serivce类

package com.smartmap.sample.test.service.impl;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Sort;
import org.springframework.data.domain.Sort.Order;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import com.smartmap.sample.test.dao.UserRepository;
import com.smartmap.sample.test.entity.User;
import com.smartmap.sample.test.service.UserService;

@Service
@Transactional
public class UserServiceImpl implements UserService {

    @Autowired
    UserRepository userRepository;

    public Long addUser(User user) {
        userRepository.save(user);
        Long id = user.getId();
        user.setName(user.getName() + "-" + "1");
        userRepository.save(user);
        return id;
    }

    public List<User> getUsersSorted() {
        Sort sort = Sort.by(Order.asc("id"));
        return userRepository.findAll(sort);
    }

    public List<User> getAllUsers(int page, int size){
        Sort sort = Sort.by(Order.asc("id"));
        PageRequest pageRequest = PageRequest.of(page, size, sort);
        Page<User> pageUser = userRepository.findAll(pageRequest);
        int totalPage = pageUser.getTotalPages();
        long count = pageUser.getTotalElements();
        return pageUser.getContent();
    }

    @Override
    public List<User> allUser() {
        /*
         * List<User> userList = new LinkedList<User>(); userList.add(new User("123",
         * "root"));
         */

        return userRepository.findAll();
    }

    @Override
    public User getUserById(Long userId) {
        /* return new User("123", "root"); */

        return userRepository.findById(userId).orElse(null);
    }

    @Transactional
    @Override
    public User save(User user) {
        /* return new User("123", "root"); */
        return userRepository.save(user);

    }

    @Override
    public int delete(Long userId) {
        /* return 1; */
        userRepository.deleteById(userId);
        return 1;
    }

}

RestController类

package com.smartmap.sample.test.controller.rest;

import java.util.List;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import com.smartmap.sample.test.entity.User;
import com.smartmap.sample.test.service.UserService;

@RestController
@RequestMapping("/api/v1.1/system/user")
public class UserRestController {
    private final Log logger = LogFactory.getLog(UserRestController.class);

    @Autowired
    UserService userService;

    /**
     * 查询所有用户
     *
     * curl -XGET 'http://127.0.0.1:8080/api/v1.1/system/user/'
     *
     * @return
     */
    @GetMapping("/")
    public List<User> getAllUsers() {
        return userService.allUser();
    }

    /**
     * 根据Id查询用户
     *
     * curl -XGET 'http://127.0.0.1:8080/api/v1.1/system/user/123'
     *
     * @param userId
     * @return
     */
    @GetMapping("/{userId}")
    public User getUserById(@PathVariable("userId") Long userId) {
        return userService.getUserById(userId);
    }

    /**
     * 翻页查询用户
     *
     * curl -XGET
     * 'http://127.0.0.1:8080/api/v1.1/system/user/query?offset=123&limit=456&sortBy=789&sortOrder=456'
     *
     * @param offset
     * @param limit
     * @param sortBy
     * @param sortOrder
     * @return
     */
    @GetMapping("/query")
    public List<User> queryUserById(@RequestParam("offset") int offset, @RequestParam("limit") int limit,
            @RequestParam("sortBy") int sortBy, @RequestParam("sortOrder") int sortOrder) {
        logger.info(String.valueOf(offset));
        logger.info(String.valueOf(limit));
        logger.info(String.valueOf(sortBy));
        logger.info(String.valueOf(sortOrder));
        return userService.allUser();
    }

    /**
     * 添加用户
     *
     * curl -XPOST 'http://127.0.0.1:8080/test/api/v1.1/system/user/'
     * -H'Content-type:application/json;charset=UTF-8' -d ' { "name":"123",
     * "createTime":"2017-01-01 00:00:00", "departmentId":"9" }'
     *
     * @param user
     * @return
     */
    @PostMapping("/")
    public User addUse(@RequestBody User user) {
        System.out.println(user.getName());
        return userService.save(user);
    }

    /**
     * 更新用户
     *
     * curl -XPUT 'http://127.0.0.1:8080/api/v1.1/system/user/'
     * -H'Content-type:application/json;charset=UTF-8' -d ' { "id": "123",
     * "name":"123" } '
     *
     * @param user
     * @return
     */
    @PutMapping("/")
    public User updateUse(@RequestBody User user) {
        return userService.save(user);
    }

    /**
     * 删除用户
     *
     * curl -XDELETE 'http://127.0.0.1:8080/api/v1.1/system/user/123'
     *
     * @param userId
     * @return
     */
    @DeleteMapping("/{userId}")
    public String deleteUser(@PathVariable("userId") Long userId) {
        if (userService.delete(userId) > 0) {
            return "{success:true, message:'delete success'}";
        } else {
            return "{success:false, message:'delete fail'}";
        }
    }

}