引入依赖
springboot集成MongoDb引入依赖
<!--spring data mongodb-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-mongodb</artifactId>
</dependency>
看一下MongoRepository接口，它集成了 spring-data-commons的PagingAndSortingRepository接口和QueryByExampleExecutor接口
public interface MongoRepository<T, ID> extends PagingAndSortingRepository<T, ID>, QueryByExampleExecutor<T>
spring-data包介绍
Spring Data 是spring的组件之一，主要目的是为了让开发者再工作中能更加轻松的完成CURD，简化代码应该是所有框架的目的吧。Spring-data-commons只是其中的一个模块而已，spring-data-mongo包含了spring-data-comons，另外spring-data-JPA也是实现了spring-data-common的接口完成简单的CRUD操作以及复杂自定义的查询更新操作。
JPA操作手册：https://docs.spring.io/spring-data/jpa/docs/current/reference/html/
最底层的接口是：
package org.springframework.data.repository;@Indexed public interface Repository<T, ID> { }中央存储库标记接口，通过实现这个接口进行扩展查询比如分页，排序等操作
jpa自定义查询的一些规范
查询创建
通常，JPA 的查询创建机制如“查询方法”中所述。以下示例显示了 JPA 查询方法转换为的内容：
公共接口 UserRepository 扩展 Repository<User, Long> {
List<User> findByEmailAddressAndLastname(String emailAddress, String lastname);
}
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MongoRepository使用
自定义实体类：
@Data
@Builder
@AllArgsConstructor
@NoArgsConstructor
public class User implements Serializable {
@Id
private String id;
private String userName;
private String userId;
private Integer age;
private String sex;
@JsonFormat(locale="zh", timezone="GMT+8", pattern="yyyy-MM-dd HH:mm:ss")
private Date birthDay;
}
定义Dao层操作MongoDB
@Repository
public interface UserRepository extends MongoRepository<User,String> {
List<User> findByUserNameLike(String userName);
}
service层
public interface UserService {
/**
* 模糊查询
* @param userName 用户名
* @return List
*/
List<User> findUserName(String userName);
/**
* 保存用户信息
* @param user user用户信息
*/
void saveUser(User user);
/**
* 根据用户id删除用户
* @param userId 用户Id
*/
void deleteUser(String userId);
/**
* @param pageable 分页信息
* @return Page
*/
Page<User> findUserPage(Pageable pageable);
/**
* 更新用户信息
* @param user 用户信息
*/
void updateUserInfo(User user);
/**
* 模糊查询 按照名字
* @param userName
* @return List
*/
List<User> findLikeUserName(String userName);
/**
* 查询所有数据
* @return List
*/
List<User> findAll();
}
controller层：
@Slf4j
@RestController
@RequestMapping("/user")
public class UserController {
@Autowired
private UserService userService;
@GetMapping("/find/userName")
public CommonResponse findUserName(@RequestParam("userName") String userName) {
List<User> users = userService.findUserName(userName);
return CommonResponse.success(users);
}
@GetMapping("/find/like")
public CommonResponse findLikeUserName(@RequestParam("userName") String userName) {
List<User> users = userService.findLikeUserName(userName);
return CommonResponse.success(users);
}
@PostMapping("/save")
public CommonResponse save(@RequestBody User user) {
userService.saveUser(user);
return CommonResponse.success();
}
@PutMapping("/update")
public CommonResponse update(@RequestBody User user) {
userService.updateUserInfo(user);
return CommonResponse.success();
}
@GetMapping("/page")
public CommonResponse page(@RequestParam Integer page, @RequestParam Integer limit) {
MongoPageAble mongoPageAble = MongoPageAble.of(page, limit);
Page<User> page1 = userService.findUserPage(mongoPageAble);
return CommonResponse.success(new PageInfoDTO<>(page1));
}
@DeleteMapping("/delete")
public CommonResponse delete(@RequestParam String userId) {
userService.deleteUser(userId);
return CommonResponse.success();
}
@GetMapping("/find/all")
public CommonResponse findAll() {
List<User> users = userService.findAll();
return CommonResponse.success(users);
}
}
提供自定义的分页查询数据PO：
public class MongoPageAble extends AbstractPageRequest {
private Sort sort;
public MongoPageAble(int pageNum, int pageSize, Sort sort) {
super(pageNum, pageSize);
this.sort = sort;
}
public static MongoPageAble of(int page, int size) {
return of(page, size, Sort.unsorted());
}
public static MongoPageAble of(int page, int size, Sort sort) {
return new MongoPageAble(page, size, sort);
}
public static MongoPageAble of(int page, int size, Sort.Direction direction, String... properties) {
return of(page, size, Sort.by(direction, properties));
}
@Override
public Sort getSort() {
return sort;
}
@Override
public Pageable next() {
return new MongoPageAble(this.getPageNumber() + 1, this.getPageSize(), this.getSort());
}
@Override
public Pageable previousOrFirst() {
return this.hasPrevious() ? this.previous() : this.first();
}
@Override
public Pageable previous() {
return this.getPageNumber() == 1 ? this : new MongoPageAble(this.getPageNumber() - 1, this.getPageSize(), this.getSort());
}
@Override
public Pageable first() {
return new MongoPageAble(1, this.getPageSize(), this.getSort());
}
public void setSort(Sort sort) {
this.sort = sort;
}
@Override
public boolean equals(@Nullable Object obj) {
if (this == obj) {
return true;
} else if (!(obj instanceof MongoPageAble)) {
return false;
} else {
MongoPageAble that = (MongoPageAble)obj;
return super.equals(that) && this.sort.equals(that.sort);
}
}
@Override
public int hashCode() {
return 31 * super.hashCode() + this.sort.hashCode();
}
@Override
public String toString() {
return String.format("Page request [number: %d, size %d, sort: %s]", this.getPageNumber(), this.getPageSize(), this.sort);
}
/**
* 使用分页这个一定要改写 他们默认的分页是以下标0开始
* @return
*/
@Override
public long getOffset() {
return ( (getPageNumber()-1) * getPageSize());
}
}
其中需要注意的是getOffset方法，因为mongoDB在实际执行分页查询时候，走的是skip().limit()操作，skip表示跳过查询的数量，这里传入的参数offset偏移量，而我们接口实际查询的时候页数page是从1开始的，mongo在计算偏移量的时候是offset=page*size 导致跳过第一页数据
自定义封装分页查询结果：
@Data
@NoArgsConstructor
public class PageInfoDTO<T> {
/**
* 总记录数
*/
private Integer totalCount;
/**
* 每页记录数
*/
private Integer pageSize;
/**
* 总页数
*/
private Integer totalPage;
/**
* 开始页数默认从1
*/
private Integer startPage;
/**
* 列表数据
*/
private List<T> list;
/**
* 分页
*
* @param list 列表数据
* @param pageSize 每页记录数
* @param startPage 当前页数
*/
public PageInfoDTO(List<T> list, Integer pageSize, Integer startPage) {
this.list = list;
this.totalCount = list.size();
this.pageSize = pageSize;
this.startPage = startPage;
this.totalPage = (int) Math.ceil((double) totalCount / pageSize);
}
/**
* 分页
*/
public PageInfoDTO(IPage<T> page) {
this.list = page.getRecords();
this.totalCount = (int) page.getTotal();
this.pageSize = (int) page.getSize();
this.startPage = (int) page.getCurrent();
this.totalPage = (int) page.getPages();
}
public PageInfoDTO(Page<T> page) {
// this.list = page.get().collect(Collectors.toList());
this.list = page.getContent();
this.totalCount = (int) page.getTotalElements();
this.pageSize = page.getSize();
this.startPage = page.getPageable().getPageNumber();
this.totalPage = page.getTotalPages();
}
}
下面开始实际测试：
插入数据：
查询全部数据：
查询结果：
{
"success": true,
"code": "200",
"msg": "操作成功",
"data": [
{
"id": "1111",
"userName": "小王",
"userId": "23",
"age": 23,
"sex": "男",
"birthDay": "2020-11-20 20:02:20"
},
{
"id": "222",
"userName": "小王",
"userId": "23",
"age": 23,
"sex": "男",
"birthDay": "2020-11-20 20:02:20"
},
{
"id": "333",
"userName": "小王",
"userId": "23",
"age": 23,
"sex": "男",
"birthDay": "2020-11-20 20:02:20"
},
{
"id": "444",
"userName": "小王",
"userId": "23",
"age": 23,
"sex": "女",
"birthDay": "2020-11-20 20:02:20"
},
{
"id": "555",
"userName": "小王22",
"userId": "23",
"age": 23,
"sex": "女",
"birthDay": "2020-11-20 20:02:20"
},
{
"id": "666",
"userName": "小王11",
"userId": "23",
"age": 23,
"sex": "女",
"birthDay": "2020-11-20 20:02:20"
}
]
}
模糊查询：
查询结果：
{
"success": true,
"code": "200",
"msg": "操作成功",
"data": [
{
"id": "1111",
"userName": "小王",
"userId": "23",
"age": 23,
"sex": "男",
"birthDay": "2020-11-20 20:02:20"
},
{
"id": "222",
"userName": "小王",
"userId": "23",
"age": 23,
"sex": "男",
"birthDay": "2020-11-20 20:02:20"
},
{
"id": "333",
"userName": "小王",
"userId": "23",
"age": 23,
"sex": "男",
"birthDay": "2020-11-20 20:02:20"
},
{
"id": "444",
"userName": "小王",
"userId": "23",
"age": 23,
"sex": "女",
"birthDay": "2020-11-20 20:02:20"
},
{
"id": "555",
"userName": "小王22",
"userId": "23",
"age": 23,
"sex": "女",
"birthDay": "2020-11-20 20:02:20"
},
{
"id": "666",
"userName": "小王11",
"userId": "23",
"age": 23,
"sex": "女",
"birthDay": "2020-11-20 20:02:20"
}
]
}
分页查询：
localhost:8080/user/page?page=2&limit=3
查询结果：
{
"success": true,
"code": "200",
"msg": "操作成功",
"data": {
"totalCount": 6,
"pageSize": 3,
"totalPage": 2,
"startPage": 2,
"list": [
{
"id": "444",
"userName": "小王",
"userId": "23",
"age": 23,
"sex": "女",
"birthDay": "2020-11-20 20:02:20"
},
{
"id": "555",
"userName": "小王22",
"userId": "23",
"age": 23,
"sex": "女",
"birthDay": "2020-11-20 20:02:20"
},
{
"id": "666",
"userName": "小王11",
"userId": "23",
"age": 23,
"sex": "女",
"birthDay": "2020-11-20 20:02:20"
}
]
}
}
在实际开发中也可使用MongoTemplate代替上面的操作 ，后续会介绍MongoTemplate的CRUD操作以及分页聚合排序等
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