我有這樣的委託方法:managedObjectContext保存不會立即插入?
- (void)didFinishCreatingTrip:(Trip *)trip
{
NSLog(@"before");
NSError* error = nil;
if (![self.database.managedObjectContext save:&error]) {
NSLog(@"%@", error);
}
NSLog(@"after");
}
當調用該方法,INSERT SQL查詢不會立即發生,但約10秒後(根據控制檯日誌)。這是預期的嗎?我能做些什麼來立即發生?問題是,當我太早殺死iPhone模擬器時,數據丟失了。
登錄:
2012-07-07 23:29:41.702 tripmoney[57542:fb03] before
2012-07-07 23:29:41.703 tripmoney[57542:fb03] after
2012-07-07 23:29:54.948 tripmoney[57542:11407] CoreData: sql: BEGIN EXCLUSIVE
2012-07-07 23:29:54.949 tripmoney[57542:11407] CoreData: sql: SELECT Z_MAX FROM Z_PRIMARYKEY WHERE Z_ENT = ?
2012-07-07 23:29:54.950 tripmoney[57542:11407] CoreData: sql: UPDATE Z_PRIMARYKEY SET Z_MAX = ? WHERE Z_ENT = ? AND Z_MAX = ?
2012-07-07 23:29:54.951 tripmoney[57542:11407] CoreData: sql: COMMIT
2012-07-07 23:29:54.953 tripmoney[57542:11407] CoreData: sql: BEGIN EXCLUSIVE
2012-07-07 23:29:54.954 tripmoney[57542:11407] CoreData: sql: INSERT INTO ZTRIP(Z_PK, Z_ENT, Z_OPT, ZNAME) VALUES(?, ?, ?, ?)
2012-07-07 23:29:54.955 tripmoney[57542:11407] CoreData: sql: COMMIT
2012-07-07 23:29:54.956 tripmoney[57542:11407] CoreData: sql: pragma page_count
2012-07-07 23:29:54.957 tripmoney[57542:11407] CoreData: annotation: sql execution time: 0.0006s
2012-07-07 23:29:54.957 tripmoney[57542:11407] CoreData: sql: pragma freelist_count
2012-07-07 23:29:54.958 tripmoney[57542:11407] CoreData: annotation: sql execution time: 0.0006s
你肯定當你認爲它是被調用這個方法? 10秒是*瘋狂*,我也不認爲這種方法是異步的。在if塊之前和之後放入一個日誌,看看它們何時被調用。 – 2012-07-07 21:27:26
用日誌編輯。它看起來非常異步。 – 2012-07-07 21:31:47
確實是... – 2012-07-07 21:35:22