objective-c - 将 100MB XML 文件导入 iOS 核心数据模型

Question

在我的应用中，我需要将一个 100MB 的 xml 文件导入核心数据模型。

到目前为止，我已经导入了一个 100KB 的 xml 文件并且一切正常。但是，不确定导入 100MB xml 需要多长时间。我会在今晚运行它，一会儿……你认为这种方法好吗？

谢谢

NSManagedObjectContext * context = [self managedObjectContext];

    // Delete all documents
    NSFetchRequest * fetch = [[[NSFetchRequest alloc] init] autorelease];
    [fetch setEntity:[NSEntityDescription entityForName:@"Document" inManagedObjectContext:context]];
    NSArray * result = [context executeFetchRequest:fetch error:nil];
    for (id basket in result)
        [context deleteObject:basket];



    //Insert documents
    TBXML * tbxml = [[TBXML tbxmlWithXMLFile:@"categ_small.xml"] retain];
    TBXMLElement * root = tbxml.rootXMLElement;
    TBXMLElement * doc = [TBXML childElementNamed:@"doc" parentElement:root];

    do {
        TBXMLElement * idDoc = [TBXML childElementNamed:@"id" parentElement:doc];
        TBXMLElement * titleDoc = [TBXML childElementNamed:@"title" parentElement:doc];
        TBXMLElement * descriptionDoc = [TBXML childElementNamed:@"description" parentElement:doc];
        TBXMLElement * time = [TBXML childElementNamed:@"time" parentElement:doc];
        TBXMLElement * tags = [TBXML childElementNamed:@"tags" parentElement:doc];
        TBXMLElement * geo = [TBXML childElementNamed:@"geo" parentElement:doc];
        TBXMLElement * event = [TBXML childElementNamed:@"event" parentElement:doc];
        TBXMLElement * user = [TBXML childElementNamed:@"user" parentElement:doc];
        TBXMLElement * categ = [TBXML childElementNamed:@"categ" parentElement:doc];

        NSManagedObject *newDocument = [NSEntityDescription
                                        insertNewObjectForEntityForName:@"Document"
                                        inManagedObjectContext:context];

        [newDocument setValue:[TBXML textForElement:idDoc] forKey:@"idDoc"];
        [newDocument setValue:[TBXML textForElement:titleDoc] forKey:@"titleDoc"];
        [newDocument setValue:[TBXML textForElement:descriptionDoc] forKey:@"descriptionDoc"];
        [newDocument setValue:[TBXML textForElement:time] forKey:@"time"];
        [newDocument setValue:[TBXML textForElement:tags] forKey:@"tags"];
        [newDocument setValue:[TBXML textForElement:geo] forKey:@"geo"];
        [newDocument setValue:[TBXML textForElement:event] forKey:@"event"];
        [newDocument setValue:[TBXML textForElement:user] forKey:@"user"];
        [newDocument setValue:[TBXML textForElement:categ] forKey:@"categ"];

    } while ((doc = doc->nextSibling));  

更新这是一次性操作，仅在模拟器中运行，不会与最终应用程序一起部署。

Answer 1

我会执行以下步骤:

• 用 ruby​​ 或 php 写一个转换器 XML->SQLite，或者如果你不是脚本语言的 friend ，那么看看 SQLite Manager，它是一个管理 SQLite 数据库的 Firefox 插件，它能够导入 XML。

• 按照本教程预填充核心数据以进行运输:How To Preload/Import Existing Data