blocks|key|99503|text|您需要首先将SQLite文件添加到Xcode项目中--最合适的位置是在“资源”文件夹中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|99504|然后，在应用程序委托代码文件中，在appDidFinishLaunching方法中，您需要首先检查是否已经创建了SQLite文件的可写副本--即:在iPhone文件系统的用户文档文件夹中创建了SQLite文件的副本。如果是，则什么也不做(否则会用默认的Xcode+SQLite副本覆盖它)|99505|如果没有，那么您可以在那里复制SQLite文件--以使其可写。|99506|请参阅下面的代码示例:这是从苹果的SQLite图书代码示例中获取的，在该示例中，从应用程序委托appDidFinishLaunching方法调用此方法。|99507|//+Creates+a+writable+copy+of+the+bundled+default+database+in+the+application+Documents+directory.
-+(void)createEditableCopyOfDatabaseIfNeeded+{
++++//+First,+test+for+existence.
++++BOOL+success;
++++NSFileManager+*fileManager+=+[NSFileManager+defaultManager];
++++NSError+*error;
++++NSArray+*paths+=+NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,+NSUserDomainMask,+YES);
++++NSString+*documentsDirectory+=+[paths+objectAtIndex:0];
++++NSString+*writableDBPath+=+[documentsDirectory+stringByAppendingPathComponent:@"bookdb.sql"];
++++success+=+[fileManager+fileExistsAtPath:writableDBPath];
++++if+(success)
++++++++return;
++++//+The+writable+database+does+not+exist,+so+copy+the+default+to+the+appropriate+location.
++++NSString+*defaultDBPath+=+[[[NSBundle+mainBundle]+resourcePath]+stringByAppendingPathComponent:@"bookdb.sql"];
++++success+=+[fileManager+copyItemAtPath:defaultDBPath+toPath:writableDBPath+error:&error];
++++if+(!success)+{
++++++++NSAssert1(0,+@"Failed+to+create+writable+database+file+with+message+'%25@'.",+[error+localizedDescription]);
++++}
}|code-block|syntax|javascript|99508|============|99509|以下是Swift+2.0%2B中的上述代码|99510|//+Creates+a+writable+copy+of+the+bundled+default+database+in+the+application+Documents+directory.
private+func+createEditableCopyOfDatabaseIfNeeded()+->+Void
{
++++//+First,+test+for+existence.
++++let+fileManager:+NSFileManager+=+NSFileManager.defaultManager();
++++let+paths:NSArray+=+NSSearchPathForDirectoriesInDomains(.DocumentDirectory,+.UserDomainMask,+true)
++++let+documentsDirectory:NSString+=+paths.objectAtIndex(0)+as!+NSString;
++++let+writableDBPath:String+=+documentsDirectory.stringByAppendingPathComponent("bookdb.sql");

++++if+(fileManager.fileExistsAtPath(writableDBPath)+==+true)
++++{
++++++++return
++++}
++++else+//+The+writable+database+does+not+exist,+so+copy+the+default+to+the+appropriate+location.
++++{
++++++++let+defaultDBPath+=+NSBundle.mainBundle().pathForResource("bookdb",+ofType:+"sql")!

++++++++do
++++++++{
++++++++++++try+fileManager.copyItemAtPath(defaultDBPath,+toPath:+writableDBPath)
++++++++}
++++++++catch+let+unknownError
++++++++{
++++++++++++print("Failed+to+create+writable+database+file+with+unknown+error:+\(unknownError)")
++++++++}
++++}
}|99511|entityMap^0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|X|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|Y|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|Z|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|10|8|@]|9|@]|A|$]]|$1|Q|3|R|5|J|7|11|8|@]|9|@]|A|$K|L]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

You need to add the SQLite file to your Xcode project first - the most appropriate place is in the resources folder.

Then in your application delegate code file, in the appDidFinishLaunching method, you need to first check if a writable copy of the the SQLite file has already been created - ie: a copy of the SQLite file has been created in the users document folder on the iPhone's file system. If yes, you don't do anything (else you would overwrite it with the default Xcode SQLite copy)

If no, then you copy the SQLite file there - to make it writable.

See the below code example to do this: this has been taken from Apple's SQLite books code sample where this method is called from the application delegates appDidFinishLaunching method.

<pre><code>// Creates a writable copy of the bundled default database in the application Documents directory.
- (void)createEditableCopyOfDatabaseIfNeeded {
 // First, test for existence.
 BOOL success;
 NSFileManager *fileManager = [NSFileManager defaultManager];
 NSError *error;
 NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
 NSString *documentsDirectory = [paths objectAtIndex:0];
 NSString *writableDBPath = [documentsDirectory stringByAppendingPathComponent:@"bookdb.sql"];
 success = [fileManager fileExistsAtPath:writableDBPath];
 if (success)
 return;
 // The writable database does not exist, so copy the default to the appropriate location.
 NSString *defaultDBPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"bookdb.sql"];
 success = [fileManager copyItemAtPath:defaultDBPath toPath:writableDBPath error:&amp;error];
 if (!success) {
 NSAssert1(0, @"Failed to create writable database file with message '%@'.", [error localizedDescription]);
 }
}
</code></pre>

============

Here's the above code in Swift 2.0+

<pre><code>// Creates a writable copy of the bundled default database in the application Documents directory.
private func createEditableCopyOfDatabaseIfNeeded() -&gt; Void
{
 // First, test for existence.
 let fileManager: NSFileManager = NSFileManager.defaultManager();
 let paths:NSArray = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
 let documentsDirectory:NSString = paths.objectAtIndex(0) as! NSString;
 let writableDBPath:String = documentsDirectory.stringByAppendingPathComponent("bookdb.sql");

 if (fileManager.fileExistsAtPath(writableDBPath) == true)
 {
 return
 }
 else // The writable database does not exist, so copy the default to the appropriate location.
 {
 let defaultDBPath = NSBundle.mainBundle().pathForResource("bookdb", ofType: "sql")!

 do
 {
 try fileManager.copyItemAtPath(defaultDBPath, toPath: writableDBPath)
 }
 catch let unknownError
 {
 print("Failed to create writable database file with unknown error: \(unknownError)")
 }
 }
}
</code></pre>

blocks|key|99529|text|如果您只是要查询数据，您应该能够将其保留在主包中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|99530|然而，这可能不是一个好做法。如果您将来要扩展您的应用程序以允许数据库的编写，那么您必须再次解决所有的问题.|99531|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

If you're just going to be querying for data, you should be able to leave it in the main bundle.

This, however, is probably not a good practice. If you were to extend your application in the future to allow for database writing, you'd have to figure everything out again...

When I initially create an SQLite database file with pre-inserted datasets for my application, I would have to place this file somewhere in my Xcode project so that it goes to my iPhone application. I guess "ressources" is the right place for that.

What are the basic "steps" for deployment of an SQLite database file in an iPhone application?

<ul>
<li>creating the database manually</li>
<li>adding the database file to the project (where?)</li>
</ul>

I'm currently reading the whole SQLite documentation, although that's not much iPhone related.

Where would you place your SQLite database file in an iPhone app?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

文章

问答

视频

学习中心

腾讯云实验室

直播

竞赛

腾讯云代码分析专区

腾讯iOA零信任安全管理系统专区

腾讯云架构师技术同盟交流圈

腾讯云数据库专区

腾讯云顾问专区

腾讯云原生专区

腾讯混元专区

腾讯云TCE专区

腾讯云Lighthouse专区

腾讯云HAI专区

腾讯云Edgeone专区

腾讯云存储专区

腾讯云智能专区

腾讯轻联专区 

腾讯云开发专区

TAPD专区

腾讯轻量云游戏服专区

腾讯云最具价值专家

腾讯云架构师技术同盟

腾讯云创作之星

腾讯云开发者先锋

腾讯云代码助手

云原生构建

TAPD 敏捷项目管理

Cloud Studio

SDK中心

API中心

命令行工具

涵盖代码开发、场景应用、自动测试全流程，助你从零构建专属AI助手

一站式MCP教程库，解锁AI应用新玩法

当我最初为我的应用程序创建一个带有预插入数据集的SQLite数据库文件时，我必须将这个文件放在我的Xcode项目中的某个地方，这样它就可以进入我的iPhone应用程序了。我想“资源”是正确的地方。在SQLite应用程序中部署iPhone数据库文件的基本“步骤”是什么？创建数据库的manuallyadding数据库文件到...

问你会把你的SQLite数据库文件放在iPhone应用程序中的哪里？
EN

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问你会把你的SQLite数据库文件放在iPhone应用程序中的哪里？EN