sqlite3第一次很好地運行INSERT和UPDATE查詢，但是第二次返回錯誤

Question

以下代碼（來自為每個新視圖創建的數據庫對象）：

-(void)update:(NSString *)queryText{
    NSLog(queryText);
    char *errorMsg;

    if (sqlite3_prepare_v2(database, [queryText UTF8String], -1, &statement, nil) == SQLITE_OK) {
    } else {
        NSLog(@"HMM, COULDNT RUN QUERY: %s\n", sqlite3_errmsg(database));  
    }
    if (sqlite3_step(statement) != SQLITE_DONE){
        NSAssert1(0, @"Error updating table: %s", errorMsg); 
    }
    sqlite3_finalize(statement);
    NSLog(@"Update saved");
}
-(void)insert_answer:(int)obj_id question_type:(NSString *)question_type score:(int)score{
    char *errorMsg;
    char *update = "INSERT INTO Answers (obj_id, question_type, score, date) VALUES (?, ?, ?, DATE())";
    //sqlite3_stmt *stmt;
    if (sqlite3_prepare_v2(database, update, -1, &statement, nil) == SQLITE_OK) { 
        sqlite3_bind_int(statement, 1, obj_id);
        sqlite3_bind_text(statement, 2, [question_type UTF8String], -1, NULL);
        sqlite3_bind_int(statement, 3, score);
    } 
    if (sqlite3_step(statement) != SQLITE_DONE){
        NSAssert1(0, @"Error inserting: %s", errorMsg); 
    }
    sqlite3_finalize(statement);
    NSLog(@"Answer saved");
}

由我的應用從以下代碼調用：

    [db insert_answer:[[dict_question objectForKey:@"JISDec"] intValue] question_type:@"kanji_meaning" score:arc4random() % 100];
    //
    //update EF, Next_question, n here
    //
    [db update:[NSString stringWithFormat:@"UPDATE Kanji SET EF = %d WHERE Kanji = '%@'", [[dict_question objectForKey:@"EF"] intValue] + 2, [dict_question objectForKey:@"question"]]];
    [db update:[NSString stringWithFormat:@"UPDATE Kanji SET Next_Question = %d WHERE Kanji = '%@'", 1, [dict_question objectForKey:@"question"]]];
    [db update:[NSString stringWithFormat:@"UPDATE Kanji SET n = %d WHERE Kanji = '%@'", [[dict_question objectForKey:@"n"] intValue] + 1, [dict_question objectForKey:@"question"]]];

並在我的應用程序中第一次回答問題時運行良好，但是下次（加載新視圖后）會返回斷言錯誤並崩潰。

有誰知道為什么？？？ 我在另一個應用程序中具有幾乎完全相同的代碼，並且沒有問題。

非常感謝。

編輯：添加堆棧：

2010-03-08 03:01:12.107 Kanji[33864:207] *** Assertion failure in -[databaseConnection update:], /Volumes/Xcode/Kanji/Classes/../databaseConnection.m:58
2010-03-08 03:01:12.108 Kanji[33864:207] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Error updating table: (null)'
2010-03-08 03:01:12.109 Kanji Training with Watanabe Sensei[33864:207] Stack: (
    30135387,
    2561586441,
    30219323,
    814852,
    37730,
    18074,
    2757637,
    3165006,
    3173743,
    3168955,
    2862559,
    2770888,
    2797665,
    37424473,
    29920128,
    29916232,
    37418517,
    37418714,
    2801583
)

Answer 1

如果您顯示“斷言錯誤”以及可能顯示堆棧跟蹤以查看實際調用失敗的信息，將很有幫助。

另外，請注意，即使您正在檢查錯誤，也不能正確執行。 即使發生錯誤，您也將繼續執行sqlite函數。 那是災難的秘訣。