核心數據問題

我從iphone開始並且面臨核心數據問題。核心數據問題

我有一個模型收集幾個實體，如員工，項目，項目類型等在啓動時，我創建了我通過核心數據框架仍然存在幾個實體。沒問題。

的問題提出時，我想顯示的基礎用戶UIToolbar內選擇一個選項卡上的項目清單。我已經設置的參數顯示（-com.apple.CoreData.SQLDebug 1）發佈的每一個SQL請求，什麼是真正尷尬的是，在控制檯中顯示的查詢給我的時候，通過源碼而是從核心數據訪問在我身邊的分貝我的結果，不，0行返回...

任何人都遇到了類似的問題？

這裏是用於檢索的項目的列表的代碼：

NSArray* retVal = nil; 
NSError *error = nil; 

NSManagedObjectContext *moc = "context retrieved"; 
NSEntityDescription *entityDescription = [NSEntityDescription entityForName:@"Project" inManagedObjectContext:moc]; 
NSFetchRequest *request = [[[NSFetchRequest alloc] init] autorelease]; 
[request setEntity:entityDescription]; 
retVal = [moc executeFetchRequest:request error:&error]; 

NSLog(@"Project type: %@", [theProjType valueForKey:@"projectTypeName"]); 
NSLog(@"Employee number: %@", [theEmployee valueForKey:@"employeeNumber"]); 

NSPredicate *predicate = [NSPredicate predicateWithFormat: @"ANY myEmployees.employeeNumber = %d AND myProjectType.projectTypeName = %d", [theEmployee valueForKey:@"employeeNumber"], [theProjType valueForKey:@"projectTypeName"]]; 
[request setPredicate:predicate]; 
retVal = [moc executeFetchRequest:request error:&error];

此代碼生成此SQL請求（在源碼分貝啓動時返回結果）：

SELECT DISTINCT 0, t0.Z_PK, t0.Z_OPT, t0.ZPROJECTNUMBER, t0.ZISEDITABLE, t0.ZPROJECTNAME, t0.ZISDELETABLE, t0.ZPROJECTEND, t0.ZPROJECTID, t0.ZPROJECTSTART, t0.ZCUSTOMERORDERNR, t0.ZMYCUSTOMER, t0.ZMYCOSTCENTRE, t0.ZMYPROJECTTYPE, t0.ZMYTRAVELTIMES FROM ZPROJECT t0 JOIN Z_4MYPROJECTS t1 ON t0.Z_PK = t1.Z_10MYPROJECTS1 JOIN ZEMPLOYEE t2 ON t1.Z_4MYEMPLOYEES = t2.Z_PK JOIN ZPROJECTTYPE t3 ON t0.ZMYPROJECTTYPE = t3.Z_PK WHERE (t2.ZEMPLOYEENUMBER = ? AND t3.ZPROJECTTYPENAME = ?)

來源

2010-10-17 Valentin Jacquemin

這將有助於張貼在那裏你建立NSFetchedResultsController代碼並執行讀取。 – Nimrod 2010-10-17 19:20:03

感謝Nimrod的建議，我爲我的問題添加了一些代碼。 – 2010-10-17 19:42:27

NSPredicate *predicate = [NSPredicate predicateWithFormat: @"ANY myEmployees.employeeNumber = %d AND myProjectType.projectTypeName = %d", [theEmployee valueForKey:@"employeeNumber"], [theProjType valueForKey:@"projectTypeName"]];

你確定這是正確的嗎？ valueForKey：總是返回一個NSObject，但佔位符是％d。這應該會產生奇怪的行爲。嘗試％@代替

來源

2010-10-18 04:23:43

謝謝！我很難問一個問題，問題很簡單：S – 2010-10-18 05:21:24

核心數據問題

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