小编Ste*_*rnK的帖子

我最近将我的应用程序中的 hibernate 更新为 5.4.4.Final。现在，我在部署过程中遇到了以下异常。

ERROR [org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentImpl|[STANDBY] ExecuteThread: '5' for queue: 'weblogic.kernel.Default (self-tuning)']
Could not fetch the SequenceInformation from the database
java.sql.SQLException: Numeric Overflow
        at oracle.jdbc.driver.NumberCommonAccessor.throwOverflow(NumberCommonAccessor.java:4136)
        at oracle.jdbc.driver.NumberCommonAccessor.getLong(NumberCommonAccessor.java:634)
        at oracle.jdbc.driver.GeneratedStatement.getLong(GeneratedStatement.java:206)
        at oracle.jdbc.driver.GeneratedScrollableResultSet.getLong(GeneratedScrollableResultSet.java:259)
        at oracle.jdbc.driver.GeneratedResultSet.getLong(GeneratedResultSet.java:558)
        at weblogic.jdbc.wrapper.ResultSet_oracle_jdbc_driver_ForwardOnlyResultSet.getLong(Unknown Source)
        at org.hibernate.tool.schema.extract.internal.SequenceInformationExtractorLegacyImpl.resultSetMaxValue(SequenceInformationExtractorLegacyImpl.java:139)
        at org.hibernate.tool.schema.extract.internal.SequenceInformationExtractorLegacyImpl.extractMetadata(SequenceInformationExtractorLegacyImpl.java:61)
        at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentImpl.sequenceInformationList(JdbcEnvironmentImpl.java:403)
        at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentImpl.<init>(JdbcEnvironmentImpl.java:268)
        at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:114)
        at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:35)
        at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.initiateService(StandardServiceRegistryImpl.java:101)
        at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:263)
        at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:237)
        at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:214)
        at org.hibernate.id.factory.internal.DefaultIdentifierGeneratorFactory.injectServices(DefaultIdentifierGeneratorFactory.java:152)
        at org.hibernate.service.internal.AbstractServiceRegistryImpl.injectDependencies(AbstractServiceRegistryImpl.java:286)
        at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:243)
        at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:214)
        at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.<init>(InFlightMetadataCollectorImpl.java:175)
        at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:118)
        at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:900)
        at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:931)
        at org.hibernate.jpa.HibernatePersistenceProvider.createContainerEntityManagerFactory(HibernatePersistenceProvider.java:141)
        at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:343)
        at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:318)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1633) …

我有需要标题数据和正文数据的 api 调用。我在 pub.dev 中找到了两个包

https://pub.dev/packages/http --> http https://pub.dev/packages/dio --> dio

这些包中哪个具有更好的性能并且适合在 flutter 应用程序中使用？

我正在为我的 springboot 应用程序使用 H2 内存数据库。我在哪里启用了hibernate.ddl-auto. 当休眠创建模式时，我遇到了异常

Caused by: org.h2.jdbc.JdbcSQLSyntaxErrorException:
Syntax error in SQL statement "CREATE TABLE PRODUCT_OFFSET_INFO (ID BIGINT NOT NULL, MODIFIED_TIMESTAMP TIMESTAMP, OFFSET[*] BIGINT, TOPIC_NAME VARCHAR(255), PRIMARY KEY (ID))"; expected "identifier"; SQL statement:
create table PRODUCT_OFFSET_INFO (ID bigint not null, MODIFIED_TIMESTAMP timestamp, OFFSET bigint, TOPIC_NAME varchar(255), primary key (ID)) [42001-200]
'''

下面是实体类：

Caused by: org.h2.jdbc.JdbcSQLSyntaxErrorException:
Syntax error in SQL statement "CREATE TABLE PRODUCT_OFFSET_INFO (ID BIGINT NOT NULL, MODIFIED_TIMESTAMP TIMESTAMP, OFFSET[*] BIGINT, TOPIC_NAME VARCHAR(255), PRIMARY KEY (ID))"; expected …

JDK 正在引入一个Stream.toList()带有JDK-8180352的 API 。这是一个基准代码，我试图将其性能与现有的进行比较Collectors.toList：

@BenchmarkMode(Mode.All)
@Fork(1)
@State(Scope.Thread)
@Warmup(iterations = 20, time = 1, batchSize = 10000)
@Measurement(iterations = 20, time = 1, batchSize = 10000)
public class CollectorsVsStreamToList {

    @Benchmark
    public List<Integer> viaCollectors() {
        return IntStream.range(1, 1000).boxed().collect(Collectors.toList());
    }

    @Benchmark
    public List<Integer> viaStream() {
        return IntStream.range(1, 1000).boxed().toList();
    }
}

结果总结如下：

Benchmark                                                       Mode  Cnt   Score    Error  Units
CollectorsVsStreamToList.viaCollectors                         thrpt   20  17.321 ±  0.583  ops/s
CollectorsVsStreamToList.viaStream                             thrpt   20  23.879 ±  1.682  ops/s
CollectorsVsStreamToList.viaCollectors                          avgt   20   0.057 ± …

最近开始学习spring boot，data jpa。正如我可以看到这个，弹簧引导数据JPA起动器使用jakarta.persistence-api，而不是javax.persistence-api：

   <artifactId>spring-boot-starter-data-jpa</artifactId>
   ...
   <dependencies>
      <dependency>
         <groupId>jakarta.persistence</groupId>
         <artifactId>jakarta.persistence-api</artifactId>
      </dependency>

      <dependency>
         <groupId>org.hibernate</groupId>
         <artifactId>hibernate-core</artifactId>
         <exclusions>
            <exclusion>
               <groupId>javax.persistence</groupId>
               <artifactId>javax.persistence-api</artifactId>
            </exclusion>
            ...
         </exclusions>
      </dependency>
   </dependencies>

jakarta.persistence-api和之间有什么区别javax.persistence-api？这次更换的原因是什么？

为了创建行级授权，我想结合spring-data接口使用@Filterhibernate注释。假设，我们有以下实体：@FilterDefJpaRepository<T, ID>

@Entity
public class User {
   @Id
   private Long id;
   private String name;
    
   @ManyToOne
   private Pharmacy pharmacy;
}
    
@Entity
public class Pharmacy {
   @Id
   private Long id;
   private String name;
}

我想根据谁向服务器发送请求来创建授权。为此，我在实体顶部添加了@Filter注释。所以，药房应该是这样的：@FilterDefPharmacy

@Entity
@FilterDef(name = "pharmacyFilter", parameters = {@ParamDef(name = "userId", type = "long")})
@Filters({
   @Filter(name = "pharmacyFilter", condition = "id in (select user.pharmacy_id from user where user.id = :userId)")
})
public class Pharmacy {
   //...
}

我创建的用于访问数据库的存储库如下所示：

@Repository …

我创建了这个生成 ROC_AUC 的函数，然后将创建的数字返回给变量。

from sklearn.metrics import roc_curve, auc
from sklearn.preprocessing import label_binarize
import matplotlib.pyplot as plt

def plot_multiclass_roc(clf, X_test, y_test, n_classes, figsize=(17, 6)):
    y_score = clf.decision_function(X_test)

    # structures
    fpr = dict()
    tpr = dict()
    roc_auc = dict()

    # calculate dummies once
    y_test_dummies = pd.get_dummies(y_test, drop_first=False).values
    for i in range(n_classes):
        fpr[i], tpr[i], _ = roc_curve(y_test_dummies[:, i], y_score[:, i])
        roc_auc[i] = auc(fpr[i], tpr[i])

    # roc for each class
    fig, ax = plt.subplots(figsize=figsize)
    ax.plot([0, 1], [0, 1], 'k--')
    ax.set_xlim([0.0, 1.0])
    ax.set_ylim([0.0, 1.05])
    ax.set_xlabel('False …

嗨，我想要实现的是在 java spring jpa 存储库中将 SQL 本机查询结果映射到我的 DTO 中，我该如何正确执行此操作？我尝试了几个代码，但它不起作用，这是我尝试过的：

第一次尝试 ：

@Repository
public interface StockRepository extends RevisionRepository<Stock, Long, Integer>, JpaRepository<Stock, Long> {
    
   @Query(value = "SELECT stock_akhir.product_id AS productId, stock_akhir.product_code AS productCode, SUM(stock_akhir.qty) as stockAkhir "
        + "FROM book_stock stock_akhir "
        + "where warehouse_code = (:warehouseCode) "
        + "AND product_code IN (:productCodes) "
        + "GROUP BY product_id, product_code, warehouse_id, warehouse_code", nativeQuery = true)
   List<StockAkhirDto> findStockAkhirPerProductIn(@Param("warehouseCode") String warehouseCode, @Param("productCodes") Set<String> productCode);
}

执行该函数后，出现此错误：

没有找到能够从类型 [org.springframework.data.jpa.repository.query.AbstractJpaQuery$TupleConverter$TupleBackedMap] 转换为类型 [com.b2bwarehouse.Dto.RequestDto.StockDto.StockAkhirDto] 的转换器

第二次尝试：

@Repository
public interface …

我在Student和之间有一个 one2one 关系Address。我希望firstName和lastName字段Student被延迟加载。我也想懒惰的address领域。

这些是我的实体类：

@Entity
@Table(name = "students")
public class Student {

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

  @OneToOne(mappedBy = "student", cascade = CascadeType.ALL, fetch = FetchType.LAZY)
  @LazyToOne(LazyToOneOption.NO_PROXY)
  private Address address;

  @Basic(fetch = FetchType.LAZY)
  @Column(name = "first_name")
  private String firstName;

  @Basic(fetch = FetchType.LAZY)
  @Column(name = "last_name")
  private String lastName;

  // getters and setters
}

地址类：

@Entity
@Table(name = "addresses")
public class Address {

  @Id
  @GeneratedValue(strategy = GenerationType.IDENTITY) …

I'm following the Learn Spring 5 etc on udemy and I'm at the part where we test our application. Everything worked fine till now, i was able to connect to the postgreSQL database and all but now I'm stuck at this test failing since 2 days.

I don't understand what is causing the Test to fail. The application run but the test doesn't. Here it is the test class:

package com.ghevi.dao;

import com.ghevi.pma.ProjectManagementApplication;
import com.ghevi.pma.dao.ProjectRepository;
import com.ghevi.pma.entities.Project;
import org.junit.Test;
import …