当我使用 Eclipse 作为 IDE 时,我曾经使用 Hibernate Tools 对数据库进行逆向工程以获得我的实体,并带有注释。
我最近转向了 IntelliJ IDEA,我认为它是一个总体更好的 IDE,但不幸的是没有适用于它的 Hibernate Tools 端口,因此我无法像以前那样生成实体。我知道 IntelliJ IDEA 有自己的逆向工程工具(通过
Persistence->Generate Persistence Mapping->By Database Schema
访问的工具),但我发现它有点错误,有时会生成完全错误的实体。
我知道 Hibernate Tools 也可以从 Ant 使用。有没有办法从 Gradle 中使用它?
我成功地使用了 Gradle 中的 Hibernate Tools,很大程度上要归功于 这个问题。
事实证明(我不知道)Gradle 确实能够调用 Ant 任务,因此可以使用预先存在的 Hibernate Tools Ant 任务来对数据库进行逆向工程。
为此,需要有一个
hibernate.cfg.xml
文件,其中包含告诉 Ant 询问如何访问我们的数据库所需的配置。这是一个例子:
<?xml version = "1.0" encoding = "utf-8"?>
<!DOCTYPE hibernate-configuration SYSTEM
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.dialect">
org.hibernate.dialect.MySQLDialect
</property>
<property name="hibernate.connection.driver_class">
com.mysql.jdbc.Driver
</property>
<property name="hibernate.connection.url">
jdbc:mysql://localhost:3306/mydb
</property>
<property name="hibernate.connection.username">
username
</property>
<property name="hibernate.connection.password">
password
</property>
</session-factory>
</hibernate-configuration>
(IntelliJ 可能会抱怨这个文件,告诉它找不到驱动程序,但这没关系,因为它们将在执行过程中由 Gradle 提供)
此配置文件将由 Gradle 调用的 Ant 任务使用。我将其放入在项目根目录中创建的新
db
文件夹中。
需要将以下内容添加到
build.gradle
文件中:
configurations {
reverseMap
}
dependencies {
//...your other dependencies...
reverseMap 'org.hibernate:hibernate-core:4.0.1.Final'
reverseMap 'org.hibernate:hibernate-tools:4.0.1.Final'
reverseMap 'org.slf4j:slf4j-simple:1.7.5'
reverseMap 'mysql:mysql-connector-java:5.1.48'
}
project.ext {
hibernateDestDir = file("$projectDir/src/main/java")
}
task reverseMap {
outputs.dir hibernateDestDir
doLast {
hibernateDestDir.exists() || hibernateDestDir.mkdirs()
ant {
taskdef(
name: 'hibernatetool',
classname: 'org.hibernate.tool.ant.HibernateToolTask',
classpath: configurations.reverseMap.asPath
)
hibernatetool(destdir: hibernateDestDir) {
jdbcconfiguration(
configurationfile: "$projectDir/db/hibernate.cfg.xml",
packagename: "com.me.models"
)
hbm2java(
jdk5: true,
ejb3: true
)
}
}
}
}
此代码创建一个名为
reverseMap
的新配置,可用于声明 reverseMap
任务所需的依赖项(需要 hibernate-core
、hibernate-tools
和 log4j
,而驱动程序应该是所需的依赖项)对于您的 DBMS)。
reverseMap
代码调用Ant任务,基本上遵循官方指南。感兴趣的部分是hbm2java
,它是实际的出口商。其余代码基本上是 Ant 任务和配置的粘合代码。
Gradle 任务可以从命令行 (
./gradlew reverseMap
) 或 IntelliJ 调用。
您使用的 Java 版本是什么? Mine Gradle 8.10.1 在 Java 17 上尝试从 FireBird 数据库导出实体时出现以下错误:
org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':reverseMap'.
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.lambda$executeIfValid$1(ExecuteActionsTaskExecuter.java:130)
at org.gradle.internal.Try$Failure.ifSuccessfulOrElse(Try.java:293)
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeIfValid(ExecuteActionsTaskExecuter.java:128)
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:116)
at org.gradle.api.internal.tasks.execution.FinalizePropertiesTaskExecuter.execute(FinalizePropertiesTaskExecuter.java:46)
at org.gradle.api.internal.tasks.execution.ResolveTaskExecutionModeExecuter.execute(ResolveTaskExecutionModeExecuter.java:51)
at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:57)
at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:74)
at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:36)
at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.executeTask(EventFiringTaskExecuter.java:77)
at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:55)
at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:52)
at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:209)
at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:204)
at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:66)
at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:59)
at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:166)
at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:59)
at org.gradle.internal.operations.DefaultBuildOperationRunner.call(DefaultBuildOperationRunner.java:53)
at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter.execute(EventFiringTaskExecuter.java:52)
at org.gradle.execution.plan.LocalTaskNodeExecutor.execute(LocalTaskNodeExecutor.java:42)
at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:331)
at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:318)
at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.lambda$execute$0(DefaultTaskExecutionGraph.java:314)
at org.gradle.internal.operations.CurrentBuildOperationRef.with(CurrentBuildOperationRef.java:85)
at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:314)
at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:303)
at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.execute(DefaultPlanExecutor.java:459)
at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.run(DefaultPlanExecutor.java:376)
at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64)
at org.gradle.internal.concurrent.AbstractManagedExecutor$1.run(AbstractManagedExecutor.java:48)
引起::java.lang.NullPointerException:无法调用“java.util.Properties.put(Object, Object)”,因为“properties”为空