別找我的數據庫資源

Question

我在我的項目稱爲mydb.sqlite一個數據庫，我用：

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

得到的路徑和IR回報databasePath --> null我在「複製包資源」檢查和它出現在這裏。我想我錯過了什麼。

Answer 1

問題是我在一個NSObject中調用了 [[NSBundle mainBundle] pathForResource:@"mydb" ofType:@"sqlite"]; 。這就是爲什麼它可以找到數據庫。現在我把它叫做ControlView

Answer 2

-(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; 
} 

調用此檢查，並在的applicationDidFinishLaunching在AppDelegate中

創建功能

希望它會幫助你。