QueryDSL：比较数组

Question

我在比较 QueryDSL 数组时遇到问题。问题是 QueryDSL 中缺少字节数组的比较，因为 ArrayPath 扩展了 SimpleExpression，它只有 eq、ne、in、isNull 等方法......

使用 Kotlin、Hibernate 5.2、QueryDSL 4.1.4、MySQL 5.7

拥有 Hibernate ebmeddable 对象 IpAddress

@Embeddable
class IpAddress(
        var ipAddressBinary: ByteArray
) 

在 DB 中映射到类型 VARBINARY(4)（对于 IPv4 地址，未来计划支持 IPv6）。我将 IP 地址以二进制形式存储在那里，以便在范围内搜索。

我想在我的嵌入式对象上创建 kotlin 扩展函数来支持 goe 和 loe 函数

到目前为止，我想出了这个：

fun ArrayPath<ByteArray, Byte>.goe(ipBytes: ByteArray): BooleanExpression {
  return Expressions.booleanOperation(Ops.GOE, ConstantImpl.create(ipBytes))
}

fun QIpAddress.goe(ipAddressStr: String): BooleanExpression {
  val ipBytes = MapperUtils.IPv4.normalizedToBytes(ipAddressStr)
  return this.ipAddressBinary.goe(ipBytes)
}

但调用

query.where(QBlackListRecord.blackListRecord.startAddress.goe(someByteArrayRepresentingIpAddress))

导致异常：

 [exec-10]java.lang.IndexOutOfBoundsException: index (1) must be less than size (1)
at com.google.common.base.Preconditions.checkElementIndex(Preconditions.java:310)
at com.google.common.base.Preconditions.checkElementIndex(Preconditions.java:292)
at com.google.common.collect.SingletonImmutableList.get(SingletonImmutableList.java:45)
at com.querydsl.core.types.Template$ByIndex.convert(Template.java:190)
at com.querydsl.core.support.SerializerBase.visitOperation(SerializerBase.java:256)
at com.querydsl.jpa.JPQLSerializer.visitOperation(JPQLSerializer.java:426)
at com.querydsl.core.support.SerializerBase.visit(SerializerBase.java:231)
at com.querydsl.core.support.SerializerBase.visit(SerializerBase.java:31)
at com.querydsl.core.types.OperationImpl.accept(OperationImpl.java:83)
at com.querydsl.core.support.SerializerBase.handle(SerializerBase.java:92)
at com.querydsl.core.support.SerializerBase.visitOperation(SerializerBase.java:267)
at com.querydsl.jpa.JPQLSerializer.visitOperation(JPQLSerializer.java:437)
at com.querydsl.core.support.SerializerBase.visit(SerializerBase.java:231)
at com.querydsl.core.support.SerializerBase.visit(SerializerBase.java:31)
at com.querydsl.core.types.OperationImpl.accept(OperationImpl.java:83)
at com.querydsl.core.support.SerializerBase.handle(SerializerBase.java:92)
at com.querydsl.jpa.JPQLSerializer.serialize(JPQLSerializer.java:220)
at com.querydsl.jpa.JPAQueryBase.serialize(JPAQueryBase.java:60)
at com.querydsl.jpa.JPAQueryBase.serialize(JPAQueryBase.java:50)
at com.querydsl.jpa.impl.AbstractJPAQuery.createQuery(AbstractJPAQuery.java:98)
at com.querydsl.jpa.impl.AbstractJPAQuery.createQuery(AbstractJPAQuery.java:94)
at com.querydsl.jpa.impl.AbstractJPAQuery.fetch(AbstractJPAQuery.java:201)
at org.springframework.data.jpa.repository.support.QuerydslJpaRepository.findAll(QuerydslJpaRepository.java:164)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.data.repository.core.support.RepositoryComposition$RepositoryFragments.invoke(RepositoryComposition.java:377)
at org.springframework.data.repository.core.support.RepositoryComposition.invoke(RepositoryComposition.java:200)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$ImplementationMethodExecutionInterceptor.invoke(RepositoryFactorySupport.java:629)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:593)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:578)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:59)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:294)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:98)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:139)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:135)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
at org.springframework.data.repository.core.support.SurroundingTransactionDetectorMethodInterceptor.invoke(SurroundingTransactionDetectorMethodInterceptor.java:61)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
at org.springframework.data.repository.core.support.MethodInvocationValidator.invoke(MethodInvocationValidator.java:99)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212)
at com.sun.proxy.$Proxy144.findAll(Unknown Source)

我不确定我对此事的处理是否正确。有没有其他方法可以比较 QueryDSL 中的字节数组，它使用简单的比较运算符生成简单的 SQL？

我只需要生成这样的 SQL

select *
from black_list_record
where start_ip_address_binary >= @binary_value

或者像这样

select *
from black_list_record
where start_ip_address_binary >= inet6_aton('10.20.0.1')

Answer 1

错误是由函数引起的

fun ArrayPath<ByteArray, Byte>.goe(ipBytes: ByteArray): BooleanExpression {
  return Expressions.booleanOperation(Ops.GOE, ConstantImpl.create(ipBytes))
}

应该是这样的

fun ArrayPath<ByteArray, Byte>.goe(ipBytes: ByteArray): BooleanExpression {
  return Expressions.booleanOperation(Ops.GOE, this, ConstantImpl.create(ipBytes))
}

我没有为需要两个参数的操作 GOE 传递“this”参数，因为它的模板是 {0} >= {1}。就是这样……

如果您不使用 Kotlin 而使用 Java，则可以使用 QueryDSL 内置方法委托 - http://www.querydsl.com/static/querydsl/4.2.1/reference/html_single/#d0e2474