试图将 VARCHAR () FOR BIT DATA '（未显示二进制数据值）' 缩小到长度 255答案

【问题标题】：trying to shrink VARCHAR () FOR BIT DATA '(Binary data value not displayed)' to length 255试图将 VARCHAR () FOR BIT DATA '（未显示二进制数据值）' 缩小到长度 255
【发布时间】：2013-02-11 15:08:14
【问题描述】：

我有一个Market 实体

@Entity
public class Market extends MutableEntity {

    @Column(nullable = false)
    private String name;
    @Column
    private String description;
    @Embedded
    private Version marketVersion; // snipped

和Version实体作为

@Embeddable
public class Version {
    private double versionNumber;
    private VersionType versionType;
    private DateTime publishedOn;
    private DateTime retiredOn;
    private double parentVersionNumber; //snipped

当我尝试测试以下内容时，它失败了

   @Test
    public void testCloneMarket() {
        final String name = "testCloneMarket";
        final String description = "testCloneMarket";
        final Market existingMarket = new MarketManager(crudService).addMarket(name, description);

        // publish market
        existingMarket.getMarketVersion().setPublishedOn(new DateTime()); // fails here


        assertNotNull(existingMarket);
    }

我认为错误是

testCloneMarket(com.myorg.project.versioning.business.MarketManagerTest)  Time elapsed: 4.11 sec  <<< ERROR!
javax.persistence.RollbackException: Error while committing the transaction
    at org.hibernate.ejb.TransactionImpl.commit(TransactionImpl.java:90)
    at com.myorg.toolkit.commons.persistence_testing.rules.JpaRule.commitOrRollbackTransaction(JpaRule.java:220)
    at com.myorg.toolkit.commons.persistence_testing.rules.JpaRule.changeTransaction(JpaRule.java:155)
    at com.myorg.project.versioning.business.MarketManagerTest.testCloneMarket(MarketManagerTest.java:63)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
    at org.junit.rules.ExternalResource$1.evaluate(ExternalResource.java:48)
    at org.junit.rules.RunRules.evaluate(RunRules.java:20)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
    at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:252)
    at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:141)
    at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:112)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:189)
    at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:165)
    at org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:85)
    at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:115)
    at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:75)
Caused by: javax.persistence.PersistenceException: org.hibernate.exception.DataException: A truncation error was encountered trying to shrink VARCHAR () FOR BIT DATA '(Binary data value not displayed)' to length 255.

我正在使用derby 进行内存测试。为什么会发生这种情况？解决方法是什么？

谢谢

【问题讨论】：

您可以发布您在数据库中加载的.sql 吗？
@Vakimshaar，我在哪里可以找到它？我是新手，请告诉我

标签： java hibernate jakarta-ee jpa derby

【解决方案1】：

我找不到setPublishedOn的来源。

只试一试！！

DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
Date date = new Date();
existingMarket.getMarketVersion().setPublishedOn(dateFormat.format(date));

【讨论】：

【解决方案2】：

尚不清楚哪一列出现截断错误。

您可以尝试通过完全展开异常链从异常链中获取更多信息：see this advice。

或者，如果您可以找到您的 derby.log 文件，并且可以使用 -Dderby.language.logStatementText=true 运行您的应用程序，您应该能够看到更多详细信息。

Derby 数据类型 VARCHAR FOR BIT DATA 支持指定长度，最大为 32,672 字节。没有默认长度，因此 256 字节长度必须是您在应用程序或用于实现持久层的框架之一中设置的值。

如果您能确定持久层在何处生成表架构，您应该能够覆盖它并为 VARCHAR FOR BIT DATA 列选择不同的长度。

【讨论】：