我有这样的委托方法:managedObjectContext保存不会立即插入?
- (void)didFinishCreatingTrip:(Trip *)trip
{
NSLog(@"before");
NSError* error = nil;
if (![self.database.managedObjectContext save:&error]) {
NSLog(@"%@", error);
}
NSLog(@"after");
}
当调用该方法,INSERT SQL查询不会立即发生,但约10秒后(根据控制台日志)。这是预期的吗?我能做些什么来立即发生?问题是,当我太早杀死iPhone模拟器时,数据丢失了。
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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
你肯定当你认为它是被调用这个方法? 10秒是*疯狂*,我也不认为这种方法是异步的。在if块之前和之后放入一个日志,看看它们何时被调用。 – 2012-07-07 21:27:26
用日志编辑。它看起来非常异步。 – 2012-07-07 21:31:47
确实是... – 2012-07-07 21:35:22