问题描述 -
- 保存没有嵌入实体的聚合根工作正常
- 保存聚合另一个实体（一对一包含关系）的聚合根时会出现问题
- 当我看到正确的准备好的语句时，Spring Data JDBC 似乎表现正确（插入根实体，获取生成的键，然后插入聚合实体）
- 在我看来，问题出现在 GenerateKeyHold 类中，该类正在接收带有一个条目“[{GENERATED_KEYS=null}]”的“keyList”
- 该代码针对空列表进行测试，但不针对空 GENERATED_KEYS
- 数据库驱动程序正确插入了行，但是代码尝试检索生成的 id 但它为空，因此出现强制转换异常
- 我包括示例代码（实体、脚本创建）和堆栈跟踪
- 请注意，我在使用内存 H2 数据库时没有观察到这个问题
- 我正在使用 spring-boot-starter-data-jdbc:jar:2.1.3.RELEASE ，它正在拉动 spring-data-jdbc:jar:1.0.5.RELEASE
如果您能帮助我找出导致此类问题的原因，我将不胜感激；我做了很多研究，但没有人报告这样的问题（由于 ROWID 到数字转换的 Oracle DB 除外）
实体
// EntityA owns an instance of EntityB
@Data
static class EntityA {
@Id Long id;
String field1;
EntityB entityB;
}
@Data
static class EntityB {
String field2;
}
SQL Server 创建脚本
DROP TABLE IF EXISTS entity_a;
GO;
DROP TABLE IF EXISTS entity_b;
GO;
CREATE TABLE entity_a (
id BIGINT IDENTITY PRIMARY KEY,
field1 VARCHAR(100)
);
GO;
CREATE TABLE entity_b (
entity_a BIGINT UNIQUE NOT NULL,
field2 VARCHAR(100)
);
GO;
例外
2019-03-20 17:45:35,482 DEBUG o.s.j.c.JdbcTemplate [update:891] [main] - Executing SQL update and returning generated keys
2019-03-20 17:45:35,486 DEBUG o.s.j.c.JdbcTemplate [execute:609] [main] - Executing prepared SQL statement [INSERT INTO entity_a (field1) VALUES (?)]
2019-03-20 17:45:35,590 DEBUG o.s.j.c.JdbcTemplate [update:891] [main] - Executing SQL update and returning generated keys
2019-03-20 17:45:35,595 DEBUG o.s.j.c.JdbcTemplate [execute:609] [main] - Executing prepared SQL statement [INSERT INTO entity_b (field2, entity_a) VALUES (?, ?)]
2019-03-20 17:45:35,621 ERROR c.m.s.c.l.LogUtil [error:74] [main] - org.springframework.data.relational.core.conversion.DbActionExecutionException: Failed to execute DbAction.Insert(entity=EntityB [field2=data2], propertyPath=EntityB, dependingOn=DbAction.InsertRoot(entity=EntityA [id=6, field1=data1, entityB=EntityB [field2=data2]], generatedId=6), additionalValues={}, generatedId=null)
at org.springframework.data.relational.core.conversion.DbAction.executeWith(DbAction.java:57)
at org.springframework.data.relational.core.conversion.AggregateChange.lambda$executeWith$0(AggregateChange.java:73)
at java.util.ArrayList.forEach(ArrayList.java:1249)
at org.springframework.data.relational.core.conversion.AggregateChange.executeWith(AggregateChange.java:71)
at org.springframework.data.jdbc.core.JdbcAggregateTemplate.save(JdbcAggregateTemplate.java:104)
at org.springframework.data.jdbc.repository.support.SimpleJdbcRepository.save(SimpleJdbcRepository.java:45)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.data.repository.core.support.RepositoryComposition$RepositoryFragments.invoke(RepositoryComposition.java:359)
at org.springframework.data.repository.core.support.RepositoryComposition.invoke(RepositoryComposition.java:200)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$ImplementationMethodExecutionInterceptor.invoke(RepositoryFactorySupport.java:644)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:608)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.lambda$invoke$3(RepositoryFactorySupport.java:595)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:595)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:59)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:294)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:98)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:139)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:93)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.data.repository.core.support.SurroundingTransactionDetectorMethodInterceptor.invoke(SurroundingTransactionDetectorMethodInterceptor.java:61)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212)
at com.mapr.sky.subscriptions.repository.db.tests.persistence.basic.$Proxy72.save(Unknown Source)
at com.mapr.sky.subscriptions.repository.db.tests.persistence.basic.BasicRepoTest.crudTest(BasicRepoTest.java:42)
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:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
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:325)
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$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
.
.
Caused by: org.springframework.dao.DataRetrievalFailureException: The generated key is not of a supported numeric type. Unable to cast [null] to [java.lang.Number]
at org.springframework.jdbc.support.GeneratedKeyHolder.getKey(GeneratedKeyHolder.java:79)
at org.springframework.data.jdbc.core.DefaultDataAccessStrategy.getIdFromHolder(DefaultDataAccessStrategy.java:323)
at org.springframework.data.jdbc.core.DefaultDataAccessStrategy.insert(DefaultDataAccessStrategy.java:111)
at org.springframework.data.jdbc.core.DefaultJdbcInterpreter.interpret(DefaultJdbcInterpreter.java:61)
at org.springframework.data.relational.core.conversion.DbAction$Insert.doExecuteWith(DbAction.java:86)
at org.springframework.data.relational.core.conversion.DbAction.executeWith(DbAction.java:55)