spring boot学习第九篇:操作mongo的集合和集合中的数据
1、安装好了Mongodb
参考：ubuntu安装mongod、配置用户访问、添删改查-CSDN博客
2、pom.xml文件内容如下：
4.0.0
org.springframework.boot
spring-boot-starter-parent
2.6.4
com.hmblogs
hmblogs
0.0.1-SNAPSHOT
hmblogs
hmblogs
8
1.2.8
1.16
7.9.2
com.alibaba
druid-spring-boot-starter
${druid.version}
org.springframework.boot
spring-boot-starter
org.springframework.boot
spring-boot-starter-test
test
com.baomidou
mybatis-plus-boot-starter
3.5.3.1
org.springframework.boot
spring-boot-starter-web
org.springframework.boot
spring-boot-starter-test
org.projectlombok
lombok
true
mysql
mysql-connector-java
runtime
org.projectlombok
lombok
true
org.bgee.log4jdbc-log4j2
log4jdbc-log4j2-jdbc4.1
${log4jdbc.version}
com.alibaba
fastjson
1.2.9
redis.clients
jedis
org.apache.kafka
kafka-clients
org.springframework.kafka
spring-kafka
org.elasticsearch.client
elasticsearch-rest-high-level-client
${es.version}
org.elasticsearch
elasticsearch
org.elasticsearch.client
elasticsearch-rest-client
org.elasticsearch
elasticsearch
${es.version}
org.elasticsearch.client
elasticsearch-rest-client
${es.version}
junit
junit
org.springframework.boot
spring-boot-starter-data-mongodb
org.springframework.boot
spring-boot-maven-plugin
3、application.yml文件内容如下：
server:
port: 8081
servlet.context-path: /
#配置数据源
spring:
datasource:
druid:
db-type: com.alibaba.druid.pool.DruidDataSource
driverClassName: net.sf.log4jdbc.sql.jdbcapi.DriverSpy
url: jdbc:log4jdbc:mysql://${DB_HOST:localhost}:${DB_PORT:3306}/${DB_NAME:eladmin}?serverTimezone=Asia/Shanghai&characterEncoding=utf8&useSSL=false
username: ${DB_USER:root}
password: ${DB_PWD:密码}
redis:
host: localhost
port: 6379
password: heming
database: 10
data:
mongodb:
uri: mongodb://hmblogs:密码@43.138.0.199:27017/hmblogs
es:
host: 43.138.0.199
port: 9200
scheme: http4、UserEntity文件内容如下：
package com.hmblogs.backend.entity;
import lombok.Data;
import java.io.Serializable;
@Data
public class UserEntity implements Serializable {
private static final long serialVersionUID = -3258839839160856613L;
private Long id;
private String userName;
private String passWord;
//getter、setter省略
}
5、UserDaoImpl文件内容如下：
package com.hmblogs.backend.dao;
import com.hmblogs.backend.entity.UserEntity;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.query.Criteria;
import org.springframework.data.mongodb.core.query.Query;
import org.springframework.data.mongodb.core.query.Update;
import org.springframework.stereotype.Component;
@Component
public class UserDaoImpl implements UserDao {
@Autowired
private MongoTemplate mongoTemplate;
/**
* 创建对象
* @param user
*/
@Override
public void saveUser(UserEntity user) {
mongoTemplate.save(user);
}
/**
* 根据用户名查询对象
* @param userName
* @return
*/
@Override
public UserEntity findUserByUserName(String userName) {
Query query=new Query(Criteria.where("userName").is(userName));
UserEntity user = mongoTemplate.findOne(query , UserEntity.class);
return user;
}
/**
* 更新对象
* @param user
*/
@Override
public void updateUser(UserEntity user) {
Query query=new Query(Criteria.where("id").is(user.getId()));
Update update= new Update().set("userName", user.getUserName()).set("passWord", user.getPassWord());
//更新查询返回结果集的第一条
mongoTemplate.updateFirst(query,update,UserEntity.class);
//更新查询返回结果集的所有
// mongoTemplate.updateMulti(query,update,UserEntity.class);
}
/**
* 删除对象
* @param id
*/
@Override
public void deleteUserById(Long id) {
Query query=new Query(Criteria.where("id").is(id));
mongoTemplate.remove(query,UserEntity.class);
}
}
6、UserDao文件内容如下：
package com.hmblogs.backend.dao;
import com.hmblogs.backend.entity.UserEntity;
public interface UserDao {
public void saveUser(UserEntity user);
public UserEntity findUserByUserName(String userName);
public void updateUser(UserEntity user);
public void deleteUserById(Long id);
}
7、测试验证类，内容如下：
package com.hmblogs.backend.util;
import com.hmblogs.backend.dao.UserDao;
import com.hmblogs.backend.entity.UserEntity;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
@RunWith(SpringRunner.class)
@SpringBootTest
public class UserDaoTest {
@Autowired
private UserDao userDao;
@Test
public void testSaveUser() throws Exception {
UserEntity user=new UserEntity();
user.setId(2l);
user.setUserName("小明");
user.setPassWord("fffooo123");
userDao.saveUser(user);
}
@Test
public void findUserByUserName(){
UserEntity user= userDao.findUserByUserName("小明");
System.out.println("user is "+user);
}
@Test
public void updateUser(){
UserEntity user=new UserEntity();
user.setId(2l);
user.setUserName("天空");
user.setPassWord("fffxxxx");
userDao.updateUser(user);
}
@Test
public void deleteUserById(){
userDao.deleteUserById(1l);
}
}
执行报错testSaveUser()方法，执行报错：
org.springframework.data.mongodb.UncategorizedMongoDbException: Exception authenticating MongoCredential{mechanism=SCRAM-SHA-1, userName='hmblogs', source='hmblogs', password=, mechanismProperties=}; nested exception is com.mongodb.MongoSecurityException: Exception authenticating MongoCredential{mechanism=SCRAM-SHA-1, userName='hmblogs', source='hmblogs', password=, mechanismProperties=}
at org.springframework.data.mongodb.core.MongoExceptionTranslator.translateExceptionIfPossible(MongoExceptionTranslator.java:140)
at org.springframework.data.mongodb.core.MongoTemplate.potentiallyConvertRuntimeException(MongoTemplate.java:2906)
at org.springframework.data.mongodb.core.MongoTemplate.execute(MongoTemplate.java:557)
at org.springframework.data.mongodb.core.MongoTemplate.saveDocument(MongoTemplate.java:1508)
at org.springframework.data.mongodb.core.MongoTemplate.doSave(MongoTemplate.java:1444)
at org.springframework.data.mongodb.core.MongoTemplate.save(MongoTemplate.java:1387)
at org.springframework.data.mongodb.core.MongoTemplate.save(MongoTemplate.java:1372)
at com.hmblogs.backend.dao.UserDaoImpl.saveUser(UserDaoImpl.java:23)
at com.hmblogs.backend.util.UserDaoTest.testSaveUser(UserDaoTest.java:24)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate(RunBeforeTestExecutionCallbacks.java:74)
at org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate(RunAfterTestExecutionCallbacks.java:84)
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:251)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
at org.junit.runners.ParentRunner.run(ParentRunner.java:413)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)
at com.intellij.rt.junit.IdeaTestRunner$Repeater$1.execute(IdeaTestRunner.java:38)
at com.intellij.rt.execution.junit.TestsRepeater.repeat(TestsRepeater.java:11)
at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:35)
at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:232)
at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:55)
Caused by: com.mongodb.MongoSecurityException: Exception authenticating MongoCredential{mechanism=SCRAM-SHA-1, userName='hmblogs', source='hmblogs', password=, mechanismProperties=}
at com.mongodb.internal.connection.SaslAuthenticator.wrapException(SaslAuthenticator.java:273)
at com.mongodb.internal.connection.SaslAuthenticator.getNextSaslResponse(SaslAuthenticator.java:137)
at com.mongodb.internal.connection.SaslAuthenticator.access$100(SaslAuthenticator.java:48)
at com.mongodb.internal.connection.SaslAuthenticator$1.run(SaslAuthenticator.java:63)
at com.mongodb.internal.connection.SaslAuthenticator$1.run(SaslAuthenticator.java:57)
at com.mongodb.internal.connection.SaslAuthenticator.doAsSubject(SaslAuthenticator.java:280)
at com.mongodb.internal.connection.SaslAuthenticator.authenticate(SaslAuthenticator.java:57)
at com.mongodb.internal.connection.DefaultAuthenticator.authenticate(DefaultAuthenticator.java:55)
at com.mongodb.internal.connection.InternalStreamConnectionInitializer.authenticate(InternalStreamConnectionInitializer.java:207)
at com.mongodb.internal.connection.InternalStreamConnectionInitializer.finishHandshake(InternalStreamConnectionInitializer.java:81)
at com.mongodb.internal.connection.InternalStreamConnection.open(InternalStreamConnection.java:185)
at com.mongodb.internal.connection.UsageTrackingInternalConnection.open(UsageTrackingInternalConnection.java:54)
at com.mongodb.internal.connection.DefaultConnectionPool$PooledConnection.open(DefaultConnectionPool.java:538)
at com.mongodb.internal.connection.DefaultConnectionPool$OpenConcurrencyLimiter.openWithConcurrencyLimit(DefaultConnectionPool.java:914)
at com.mongodb.internal.connection.DefaultConnectionPool$OpenConcurrencyLimiter.openOrGetAvailable(DefaultConnectionPool.java:855)
at com.mongodb.internal.connection.DefaultConnectionPool.get(DefaultConnectionPool.java:173)
at com.mongodb.internal.connection.DefaultConnectionPool.get(DefaultConnectionPool.java:162)
at com.mongodb.internal.connection.DefaultServer.getConnection(DefaultServer.java:101)
at com.mongodb.internal.binding.ClusterBinding$ClusterBindingConnectionSource.getConnection(ClusterBinding.java:175)
at com.mongodb.client.internal.ClientSessionBinding$SessionBindingConnectionSource.getConnection(ClientSessionBinding.java:188)
at com.mongodb.internal.operation.OperationHelper.withSuppliedResource(OperationHelper.java:581)
at com.mongodb.internal.operation.OperationHelper.lambda$withSourceAndConnection$3(OperationHelper.java:563)
at com.mongodb.internal.operation.OperationHelper.withSuppliedResource(OperationHelper.java:589)
at com.mongodb.internal.operation.OperationHelper.withSourceAndConnection(OperationHelper.java:562)
at com.mongodb.internal.operation.MixedBulkWriteOperation.lambda$execute$3(MixedBulkWriteOperation.java:232)
at com.mongodb.internal.async.function.RetryingSyncSupplier.get(RetryingSyncSupplier.java:65)
at com.mongodb.internal.operation.MixedBulkWriteOperation.execute(MixedBulkWriteOperation.java:268)
at com.mongodb.internal.operation.MixedBulkWriteOperation.execute(MixedBulkWriteOperation.java:84)
at com.mongodb.client.internal.MongoClientDelegate$DelegateOperationExecutor.execute(MongoClientDelegate.java:212)
at com.mongodb.client.internal.MongoCollectionImpl.executeSingleWriteRequest(MongoCollectionImpl.java:1010)
at com.mongodb.client.internal.MongoCollectionImpl.executeReplaceOne(MongoCollectionImpl.java:568)
at com.mongodb.client.internal.MongoCollectionImpl.replaceOne(MongoCollectionImpl.java:551)
at org.springframework.data.mongodb.core.MongoTemplate.lambda$saveDocument$18(MongoTemplate.java:1540)
at org.springframework.data.mongodb.core.MongoTemplate.execute(MongoTemplate.java:555)
... 39 more
Caused by: com.mongodb.MongoCommandException: Command failed with error 18 (AuthenticationFailed): 'Authentication failed.' on server 43.138.0.199:27017. The full response is {"ok": 0.0, "errmsg": "Authentication failed.", "code": 18, "codeName": "AuthenticationFailed"}
at com.mongodb.internal.connection.ProtocolHelper.getCommandFailureException(ProtocolHelper.java:198)
at com.mongodb.internal.connection.InternalStreamConnection.receiveCommandMessageResponse(InternalStreamConnection.java:418)
at com.mongodb.internal.connection.InternalStreamConnection.sendAndReceive(InternalStreamConnection.java:342)
at com.mongodb.internal.connection.CommandHelper.sendAndReceive(CommandHelper.java:96)
at com.mongodb.internal.connection.CommandHelper.executeCommand(CommandHelper.java:44)
at com.mongodb.internal.connection.SaslAuthenticator.sendSaslStart(SaslAuthenticator.java:228)
at com.mongodb.internal.connection.SaslAuthenticator.getNextSaslResponse(SaslAuthenticator.java:135)
... 71 more 继续找下办法看怎么处理。
参考：org.springframework.data.mongodb.UncategorizedMongoDbException: Exception authenticating MongoCreden-CSDN博客
问题解决了，能正常保存了。
application.yml文件内容如下：
server:
port: 8081
servlet.context-path: /
#配置数据源
spring:
datasource:
druid:
db-type: com.alibaba.druid.pool.DruidDataSource
driverClassName: net.sf.log4jdbc.sql.jdbcapi.DriverSpy
url: jdbc:log4jdbc:mysql://${DB_HOST:localhost}:${DB_PORT:3306}/${DB_NAME:eladmin}?serverTimezone=Asia/Shanghai&characterEncoding=utf8&useSSL=false
username: ${DB_USER:root}
password: ${DB_PWD:密码保密}
redis:
host: localhost
port: 6379
password: heming
database: 10
data:
mongodb:
host: 43.138.0.199
port: 27017
username: hmblogs
password: 密码保密
database: hmblogs
authentication-database: admin
es:
host: 43.138.0.199
port: 9200
scheme: httpconsole截图如下：
在Robo 3T里面查看数据，有对应数据，集合不存在也自动创建了。
执行findUserByUserName()，根据查询条件查看单个数据：
修改数据，执行updateUser()方法，
在Robo 3T中查看数据，如下所示：
删除数据，
查看数据，还是保留了id为2的数据。要删id为2的数据，则参数改成2
然后查看数据，该集合已经变成空的了。
用添加数据的方法执行5条数据后，分页查询数据以及根据查询条件分页查询数据，对数据排序，如下：
大于&&排序：
public List findUserByCriteria(UserEntity user) {
Query query=new Query(Criteria.where("id").gt(user.getId()));
List users = mongoTemplate.find(query , UserEntity.class);
users.sort(new Comparator() {
@Override
public int compare(UserEntity o1, UserEntity o2) {
return o1.getId().intValue()-o2.getId().intValue();
}
});
return users;
} 结果如下：
只查出了id>2的数据，且按id升序排序。
下面再看看，根据查询条件分页查询数据，id大于2，且查出第2页数据，每页2条记录，那就查出id=5和id=7的记录，同时要查出总数，便于页面分页。对分页之后得到的结果排序意义不大。
执行结果如下：
现贴出有新增和修改的代码，
新增了PageQuery代码如下：
package com.hmblogs.backend.dao;
import lombok.Data;
@Data
public class PageQuery {
private int pageNum;
private int pageSize;
private T criteria;
}
新增了PageResult代码如下：
package com.hmblogs.backend.dao;
import lombok.Data;
import java.util.List;
@Data
public class PageResult {
private long totalRecord;
private List list;
}
UserDao类追加代码如下：
package com.hmblogs.backend.dao;
import com.hmblogs.backend.entity.UserEntity;
public interface UserDao {
public void saveUser(UserEntity user);
public UserEntity findUserByUserName(String userName);
public void updateUser(UserEntity user);
public void deleteUserById(Long id);
public PageResult findUserByCriteria(PageQuery pageQuery);
}
UserDaoImpl类追加代码如下，import块有改动，所以贴出该类的代码：
package com.hmblogs.backend.dao;
import com.hmblogs.backend.entity.UserEntity;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Sort;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.query.Criteria;
import org.springframework.data.mongodb.core.query.Query;
import org.springframework.data.mongodb.core.query.Update;
import org.springframework.stereotype.Component;
import java.util.Comparator;
import java.util.List;
@Component
public class UserDaoImpl implements UserDao {
@Autowired
private MongoTemplate mongoTemplate;
/**
* 创建对象
* @param user
*/
@Override
public void saveUser(UserEntity user) {
mongoTemplate.save(user);
}
/**
* 根据用户名查询对象
* @param userName
* @return
*/
@Override
public UserEntity findUserByUserName(String userName) {
Query query=new Query(Criteria.where("userName").is(userName));
UserEntity user = mongoTemplate.findOne(query , UserEntity.class);
return user;
}
/**
* 更新对象
* @param user
*/
@Override
public void updateUser(UserEntity user) {
Query query=new Query(Criteria.where("id").is(user.getId()));
Update update= new Update().set("userName", user.getUserName()).set("passWord", user.getPassWord());
//更新查询返回结果集的第一条
mongoTemplate.updateFirst(query,update,UserEntity.class);
//更新查询返回结果集的所有
// mongoTemplate.updateMulti(query,update,UserEntity.class);
}
/**
* 删除对象
* @param id
*/
@Override
public void deleteUserById(Long id) {
Query query=new Query(Criteria.where("id").is(id));
mongoTemplate.remove(query,UserEntity.class);
}
@Override
public PageResult findUserByCriteria(PageQuery pageQuery) {
int pageNum = pageQuery.getPageNum();
int pageSize = pageQuery.getPageSize();
UserEntity userEntityQuery = pageQuery.getCriteria();
Query query = new Query(Criteria.where("id")
.gt(userEntityQuery.getId()));
long count = mongoTemplate.count(query, UserEntity.class);
Query queryList = query.skip((pageNum-1)*pageSize).limit(pageSize);
List users = mongoTemplate.find(queryList , UserEntity.class);
PageResult pageResult = new PageResult();
pageResult.setList(users);
pageResult.setTotalRecord(count);
return pageResult;
}
}
UserDaoTest代码如下：
package com.hmblogs.backend.util;
import com.hmblogs.backend.dao.PageQuery;
import com.hmblogs.backend.dao.PageResult;
import com.hmblogs.backend.dao.UserDao;
import com.hmblogs.backend.entity.UserEntity;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import java.util.List;
@RunWith(SpringRunner.class)
@SpringBootTest
public class UserDaoTest {
@Autowired
private UserDao userDao;
@Test
public void testSaveUser() throws Exception {
UserEntity user=new UserEntity();
user.setId(4l);
user.setUserName("aa");
user.setPassWord("bb");
userDao.saveUser(user);
}
@Test
public void findUserByUserName(){
UserEntity user= userDao.findUserByUserName("小明");
System.out.println("user is "+user);
}
@Test
public void updateUser(){
UserEntity user=new UserEntity();
user.setId(2l);
user.setUserName("天空");
user.setPassWord("fffxxxx");
userDao.updateUser(user);
}
@Test
public void deleteUserById(){
userDao.deleteUserById(2l);
}
@Test
public void findUsersByCriteria(){
UserEntity userQuery = new UserEntity();
userQuery.setId(2l);
PageQuery pageQuery = new PageQuery();
pageQuery.setCriteria(userQuery);
pageQuery.setPageNum(2);
pageQuery.setPageSize(2);
PageResult user= userDao.findUserByCriteria(pageQuery);
System.out.println("user is "+user);
}
}
根据查询条件筛选数据、分页、查出符合查询条件的总数，都做到了，如果还要再加上要根据最后修改时间降序排序，最后修改的数据要放在第1页，很早之前修改的数据放在最后一页，这里可以理解为根据id降序排序，id值越大的说明越晚产生的，那就是查出id为3、4的记录了，而不是id为5、7的记录。
数据以及需求如下图所示：
但是mongoTemplate的API，没看到有sort的API，怎么办呢？搜资料发现，如下代码可以实现：
public PageResult findUserByCriteria(PageQuery pageQuery) {
int pageNum = pageQuery.getPageNum();
int pageSize = pageQuery.getPageSize();
UserEntity userEntityQuery = pageQuery.getCriteria();
Query query = new Query(Criteria.where("id")
.gt(userEntityQuery.getId()));
long count = mongoTemplate.count(query, UserEntity.class);
// 10. 分页
// 11. 排序
query.with(PageRequest.of(pageNum-1, pageSize,
Sort.by(Sort.Order.desc("id"))));
List users = mongoTemplate.find(query , UserEntity.class);
PageResult pageResult = new PageResult();
pageResult.setList(users);
pageResult.setTotalRecord(count);
return pageResult;
} 执行结果如下：
