Objective c FMB数据库已锁定
因此,我创建了一个存储一些数据的应用程序。但是,每次调用我编写的delete函数,然后调用另一个函数后,我都会收到一个错误,说Objective c FMB数据库已锁定,objective-c,fmdb,Objective C,Fmdb,因此,我创建了一个存储一些数据的应用程序。但是,每次调用我编写的delete函数,然后调用另一个函数后,我都会收到一个错误,说数据库已锁定 这就是功能: + (void)deleteRestaurants:(NSString *)number { FMDatabase *database = [sDatabase openUp]; [database open]; FMResultSet *rs = [database executeQuery:[NSString s
数据库已锁定
这就是功能:
+ (void)deleteRestaurants:(NSString *)number {
FMDatabase *database = [sDatabase openUp];
[database open];
FMResultSet *rs = [database executeQuery:[NSString stringWithFormat:@"SELECT * FROM restaurants WHERE id='%@'", number]];
if ([rs next]) {
NSString *cloudKit = [rs stringForColumn:@"CloudKit"];
NSLog(@"CloudKit is %@", cloudKit);
CKRecordID *recordID = [[CKRecordID alloc] initWithRecordName:cloudKit];
NSLog(@"recordID is %@", recordID);
[[CKContainer defaultContainer].privateCloudDatabase deleteRecordWithID:recordID completionHandler:^(CKRecordID *recordID, NSError *error) {
NSLog(@"%@", error);
}];
}
NSString *query = [NSString stringWithFormat:@"delete from restaurants where id='%@'", number];
[database executeUpdate:query];
}
我做错了什么?或者我该如何解决/预防这一问题?罗布·马约尔是对的。你需要[接近]。看起来是这样的:
FMResultSet *rs = [database executeQuery:[NSString stringWithFormat:@"SELECT * FROM restaurants WHERE id='%@'", number]];
if ([rs next]) {
NSString *cloudKit = [rs stringForColumn:@"CloudKit"];
NSLog(@"CloudKit is %@", cloudKit);
CKRecordID *recordID = [[CKRecordID alloc] initWithRecordName:cloudKit];
NSLog(@"recordID is %@", recordID);
[[CKContainer defaultContainer].privateCloudDatabase deleteRecordWithID:recordID completionHandler:^(CKRecordID *recordID, NSError *error) {
NSLog(@"%@", error);
}];
}
[rs close];
user4992124我将为您提供删除数据的示例代码。请自定义有关您的编码的代码
- (IBAction)actionDelete:(id)sender
{
NSArray *dirPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docDir = [dirPaths objectAtIndex:0];
NSString *databasePath = [docDir stringByAppendingPathComponent:@"yourDBName.sqlite"];
FMDatabase *database = [FMDatabase databaseWithPath:databasePath];
[database open];
[database executeUpdate:@"delete from phone where id = ?",number];
UIAlertView *alert =[[UIAlertView alloc]initWithTitle:@"Sample SQLite" message:@"Deleted Successfully" delegate:Nil cancelButtonTitle:@"OK"otherButtonTitles: nil];
[alert show];
[database close];
}
在执行delete语句之前,请尝试
[rs close]
。