ios fmdb從文件加載db

Question

我使用sqlite和fmdb包裝。我對負載DB代碼是這樣的：

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
NSString *docsPath = [paths objectAtIndex:0]; 
NSString *path = [docsPath stringByAppendingPathComponent:@"biscuit.sqlite"]; 
FMDatabase *db = [FMDatabase databaseWithPath:path]; 

我添加biscuit.sqlite到我的項目，但是這個代碼創建新的文件，而不是打開現有的。我怎樣才能加載這個文件？

Answer 1

如果你只是想從你的數據庫中讀取數據，嘗試使用下面的代碼：如果你需要讀/寫訪問

NSString *path = [[NSBundle mainBundle] pathForResource:@"biscuit" ofType:@"sqlite"]; 

，你有你的數據庫，首先複製到可寫的用戶文件夾。

NSFileManager *fileManager = [NSFileManager defaultManager]; 
NSError *error; 
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
NSString *documentsDir = [paths objectAtIndex:0]; 
NSString *dbPath = [documentsDir stringByAppendingPathComponent:@"biscuit.sqlite"]; 
BOOL success = [fileManager fileExistsAtPath:dbPath]; 
if (!success) { 

    NSString *defaultDBPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"biscuit.sqlite"]; 
    success = [fileManager copyItemAtPath:defaultDBPath toPath:dbPath error:&error]; 

    if (!success) { 
     NSLog(@"Failed to create writable DB. Error '%@'.", [error localizedDescription]); 
    } else { 
     NSLog(@"DB copied."); 
    } 
}else { 
    NSLog(@"DB exists, no need to copy."); 
}