从大型数据库中读取

时间：2018-01-18 12:36:48

标签： java android database sqlite android-sqlite

我正在编写一个应用程序，我需要从数据库加载和读取。此数据库大约900MB。当我将它复制到我的app目录中的\assets\databases时，android studio上会弹出一个java堆空间错误。我用org.gradle.jvmargs=-Xmx4608m增加了堆空间。我也试过在网上找到的其他解决方案，但我的问题陷入困境。我也知道apk文件应该有多大限制。这可能导致java堆空间错误，因为我的数据库很大，可以作为apk的一部分加载。

有什么替代方案？如何在没有将数据库物理保存在.apk文件中的情况下从Android应用程序中读取数据库。

这是构建错误的堆栈跟踪

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:packageDebug'.
> Java heap space

* Try:
Run with --info or --debug option to get more log output.

* Exception is:
org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':app:packageDebug'.
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:100)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:70)
    at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:63)
    at org.gradle.api.internal.tasks.execution.ResolveTaskOutputCachingStateExecuter.execute(ResolveTaskOutputCachingStateExecuter.java:54)
    at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:58)
    at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:88)
    at org.gradle.api.internal.tasks.execution.ResolveTaskArtifactStateTaskExecuter.execute(ResolveTaskArtifactStateTaskExecuter.java:52)
    at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:52)
    at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:54)
    at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.java:43)
    at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:34)
    at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker$1.run(DefaultTaskGraphExecuter.java:248)
    at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:336)
    at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:328)
    at org.gradle.internal.progress.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:197)
    at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:107)
    at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:241)
    at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:230)
    at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.processTask(DefaultTaskPlanExecutor.java:124)
    at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.access$200(DefaultTaskPlanExecutor.java:80)
    at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker$1.execute(DefaultTaskPlanExecutor.java:105)
    at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker$1.execute(DefaultTaskPlanExecutor.java:99)
    at org.gradle.execution.taskgraph.DefaultTaskExecutionPlan.execute(DefaultTaskExecutionPlan.java:625)
    at org.gradle.execution.taskgraph.DefaultTaskExecutionPlan.executeWithTask(DefaultTaskExecutionPlan.java:580)
    at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.run(DefaultTaskPlanExecutor.java:99)
    at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:63)
    at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:46)
    at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:55)
Caused by: org.gradle.tooling.BuildException: Java heap space
    at com.android.build.gradle.internal.scope.OutputScope.lambda$parallelForEachOutput$10(OutputScope.java:241)
    at com.android.build.gradle.internal.scope.OutputScope.parallelForEachOutput(OutputScope.java:236)
    at com.android.build.gradle.internal.scope.OutputScope.parallelForEachOutput(OutputScope.java:197)
    at com.android.build.gradle.internal.scope.OutputScope.parallelForEachOutput(OutputScope.java:181)
    at com.android.build.gradle.tasks.PackageAndroidArtifact.doFullTaskAction(PackageAndroidArtifact.java:471)
    at com.android.build.gradle.internal.tasks.IncrementalTask.taskAction(IncrementalTask.java:109)
    at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:73)
    at org.gradle.api.internal.project.taskfactory.DefaultTaskClassInfoStore$IncrementalTaskAction.doExecute(DefaultTaskClassInfoStore.java:173)
    at org.gradle.api.internal.project.taskfactory.DefaultTaskClassInfoStore$StandardTaskAction.execute(DefaultTaskClassInfoStore.java:134)
    at org.gradle.api.internal.project.taskfactory.DefaultTaskClassInfoStore$StandardTaskAction.execute(DefaultTaskClassInfoStore.java:121)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$1.run(ExecuteActionsTaskExecuter.java:122)
    at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:336)
    at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:328)
    at org.gradle.internal.progress.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:197)
    at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:107)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:111)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:92)
    ... 27 more
Caused by: java.lang.OutOfMemoryError: Java heap space
    at com.google.common.io.ByteStreams.toByteArray(ByteStreams.java:165)
    at com.android.apkzlib.zip.StoredEntry.read(StoredEntry.java:346)
    at com.android.apkzlib.sign.SigningExtension.onZipEntryOutput(SigningExtension.java:256)
    at com.android.apkzlib.sign.SigningExtension.access$400(SigningExtension.java:55)
    at com.android.apkzlib.sign.SigningExtension$1.lambda$added$0(SigningExtension.java:164)
    at com.android.apkzlib.sign.SigningExtension$1$$Lambda$378/1751952517.run(Unknown Source)
    at com.android.apkzlib.zip.ZFile.notify(ZFile.java:2099)
    at com.android.apkzlib.zip.ZFile.addToEntries(ZFile.java:1746)
    at com.android.apkzlib.zip.ZFile.processAllReadyEntries(ZFile.java:1687)
    at com.android.apkzlib.zip.ZFile.processAllReadyEntriesWithWait(ZFile.java:1708)
    at com.android.apkzlib.zip.ZFile.hasPendingChangesWithWait(ZFile.java:2517)
    at com.android.apkzlib.zfile.ApkZFileCreator.hasPendingChangesWithWait(ApkZFileCreator.java:180)
    at com.android.builder.internal.packaging.IncrementalPackager.hasPendingChangesWithWait(IncrementalPackager.java:319)
    at com.android.build.gradle.tasks.PackageAndroidArtifact.doTask(PackageAndroidArtifact.java:694)
    at com.android.build.gradle.tasks.PackageAndroidArtifact.splitFullAction(PackageAndroidArtifact.java:522)
    at com.android.build.gradle.tasks.PackageAndroidArtifact$$Lambda$327/1788085017.processSplit(Unknown Source)
    at com.android.build.gradle.internal.scope.OutputScope.lambda$parallelForEachOutput$6(OutputScope.java:186)
    at com.android.build.gradle.internal.scope.OutputScope$$Lambda$328/436614112.processSplit(Unknown Source)
    at com.android.build.gradle.internal.scope.OutputScope.lambda$parallelForEachOutput$7(OutputScope.java:203)
    at com.android.build.gradle.internal.scope.OutputScope$$Lambda$329/792075765.processSplit(Unknown Source)
    at com.android.build.gradle.internal.scope.OutputScope.lambda$null$8(OutputScope.java:225)
    at com.android.build.gradle.internal.scope.OutputScope$$Lambda$331/1881111235.call(Unknown Source)
    at com.android.ide.common.internal.WaitableExecutor.waitForAllTasks(WaitableExecutor.java:215)
    at com.android.build.gradle.internal.scope.OutputScope.parallelForEachOutput(OutputScope.java:235)
    at com.android.build.gradle.internal.scope.OutputScope.parallelForEachOutput(OutputScope.java:197)
        at     com.android.build.gradle.internal.scope.OutputScope.parallelForEachOutput(Output    Scope.java:181)


    * Get more help at https://help.gradle.org

     BUILD FAILED in 3m 24s

2 个答案:

答案 0 :(得分：1)

使用rest api？要认真对待每个设备上都有这么大的数据库，想象你想要更新应用程序 - 用户应该每次重新下载整个应用程序。

如果您需要在设备上安装大型数据库，您应该拥有可以在应用程序启动时下载和执行的SQL脚本。这可以解决更新问题。但无论如何你应该有一些网络服务。

答案 1 :(得分：0)

由于我主要同意之前的回答，我可以建议基于用户体验的混合方法：

  • 您需要在使用的微调器，过滤器和其他小部件上显示的任何数据，并且需要超快速响应才能拥有应用内数据库。
  • 搜索/过滤功能显示的任何数据或具有大量数据的数据应由外部实体（外部bd连接，web_service等）提供。您必须知道以任何形式实现Web数据库服务器的方法。我的建议MySql，但至少需要托管。

拥有一个大型数据库会有很多＆＃34;墙壁＆＃34;可执行的实现，但需要付出很多努力。

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