Question

我的项目中有一个名为mydb.sqlite的数据库，我用过：

databasePath = [[NSBundle mainBundle] pathForResource:@"mydb" ofType:@"sqlite"];

获取路径并且ir返回databasePath --> null我检查了我的“Copy Bundle Resources”，它出现在这里。我想我错过了什么。

Answer 1

-(void)checkAndCreateDatabase
{ 
    //Check if the SQL database has already been saved to the users phone, if not then copy it over
   BOOL success;

    //Create a FileManager object, we will use this to check the status
//of the database and to copy it over if required
   NSFileManager *fileManager = [NSFileManager defaultManager];

//Check if the database has already been created in the users filesystem
   success = [fileManager fileExistsAtPath:[self databasePath]];

   NSLog(@"databasePath = %@",databasePath);

   NSLog(@"Success = %d",success);

// If the database already exists then return without doing anything
   if(success) return;

// If not then proceed to copy the database from the application to the users filesystem

// Get the path to the database in the application package
   NSString *databasePathFromApp = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:databaseName];

// Copy the database from the package to the users filesystem
   [fileManager copyItemAtPath:databasePathFromApp toPath:databaseName error:nil];

}


-(NSString *)databasePath
{
   NSString *docsDir;
   NSArray *dirPaths;

   // Get the documents directory
   dirPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

   docsDir = [dirPaths objectAtIndex:0];

   // Build the path to the database file
   NSString *databasePath = [[NSString alloc] initWithString: [docsDir stringByAppendingPathComponent:@"YouDatabaseName.sqlite"]];

   return databasePath;
}

调用此检查并在AppDelegate中的applicationDidFinishLaunching中创建函数

希望它会对你有所帮助。

Answer 2

问题是我在打电话 [[NSBundle mainBundle] pathForResource:@"mydb" ofType:@"sqlite"]; 在NSObject中。这就是它可以找到数据库的原因。现在我在ControlView中调用它

找不到我的数据库资源

2 个答案: