访问核心数据模型/联系人数据库时出现间歇性错误

Question

我的 iOS 应用程序出现错误。令人沮丧的是，这是一个间歇性错误——我正在执行的任务连续运行 5 或 6 次，然后意外崩溃。错误日志表明打开 sqlite 数据库时出错 - 大概是我的应用程序中的核心数据模型。但是 Xcode 显示发生错误的行是访问 Apple 联系人数据库。所以我不清楚发生了什么。错误日志如下。任何人都可以解释下面的输出并对此有所了解吗？

    warning: Could not compile statement PRAGMA journal_mode = wal;: unable to open database file
error 14 creating properties table: unable to open database file
warning: Could not compile statement SELECT value FROM _SqliteDatabaseProperties WHERE key = ?;: unable to open database file
warning: Could not compile statement SELECT value FROM _SqliteDatabaseProperties WHERE key = ?;: unable to open database file
warning: Could not compile statement SELECT value FROM _SqliteDatabaseProperties WHERE key = ?;: unable to open database file
warning: Could not compile statement SELECT ROWID, First, Last, Middle, NULL, NULL, NULL, Organization, NULL, NULL, Kind, NULL, NULL, Nickname, Prefix, Suffix, FirstSort, LastSort, CreationDate, ModificationDate, CompositeNameFallback, NULL, StoreID, NULL, FirstSortSection, LastSortSection, FirstSortLanguageIndex, LastSortLanguageIndex, NULL, NULL, NULL, PersonLink, NULL, IsPreferredName FROM ABPerson;: unable to open database file
warning: Could not compile statement SELECT ROWID, First, Last, Middle, NULL, NULL, NULL, Organization, NULL, NULL, Kind, NULL, NULL, Nickname, Prefix, Suffix, FirstSort, LastSort, CreationDate, ModificationDate, CompositeNameFallback, NULL, StoreID, NULL, FirstSortSection, LastSortSection, FirstSortLanguageIndex, LastSortLanguageIndex, NULL, NULL, NULL, PersonLink, NULL, IsPreferredName FROM ABPerson;: unable to open database file
warning: Could not compile statement INSERT OR REPLACE INTO _SqliteDatabaseProperties VALUES (?, ?);: unable to open database file
warning: Could not compile statement SELECT value FROM _SqliteDatabaseProperties WHERE key = ?;: unable to open database file
warning: Could not compile statement INSERT OR REPLACE INTO _SqliteDatabaseProperties VALUES (?, ?);: unable to open database file
2012-03-29 11:43:13.813 iPT[10500:11303] Error loading /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.1.sdk/System/Library/DataClassMigrators/AccountMigrator.migrator/AccountMigrator:  dlopen(/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.1.sdk/System/Library/DataClassMigrators/AccountMigrator.migrator/AccountMigrator, 265): no suitable image found.  Did find:
    /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.1.sdk/System/Library/DataClassMigrators/AccountMigrator.migrator/AccountMigrator: open() failed with errno=24
2012-03-29 11:43:13.814 iPT[10500:11303] [+[AccountsManager _migrateAccountsIfNeeded]] Accounts migration failed
warning: Could not compile statement SELECT value FROM _SqliteDatabaseProperties WHERE key = ?;: unable to open database file
warning: Could not compile statement SELECT value FROM _SqliteDatabaseProperties WHERE key = ?;: unable to open database file
warning: Could not compile statement SELECT ROWID, First, Last, Middle, NULL, NULL, NULL, Organization, NULL, NULL, Kind, NULL, NULL, Nickname, Prefix, Suffix, FirstSort, LastSort, CreationDate, ModificationDate, CompositeNameFallback, NULL, StoreID, NULL, FirstSortSection, LastSortSection, FirstSortLanguageIndex, LastSortLanguageIndex, NULL, NULL, NULL, PersonLink, NULL, IsPreferredName FROM ABPerson WHERE ROWID = ?;: unable to open database file

崩溃发生时我正在执行的代码是……

Client *client = [mutableFetchResults objectAtIndex:loop];
            ABRecordID recordID = [client.addressBookID intValue];
            ABRecordRef person = ABAddressBookGetPersonWithRecordID (addressBook,recordID);
            NSString *clientFirstName = (NSString *)ABRecordCopyValue(person, kABPersonFirstNameProperty);
            NSString *clientLastName = (NSString *)ABRecordCopyValue(person, kABPersonLastNameProperty);
            NSString *clientCompositeName = [NSString stringWithFormat:@"%@ %@", clientFirstName, clientLastName];

Answer 1

我假设您正在以下列方式声明地址簿？

    ABAddressBookRef addressBook = ABAddressBookCreate();