我想將3段數據添加到SQLite3數據庫。在教程的幫助下,我快到了。以下是我的代碼。從Xcode內向SQLite3數據庫添加數據
我收到了我期望從NSLogs
得到的結果。我發現數據庫沒有問題,我編譯聲明發送到數據庫沒有問題,但當應用程序到達sqlite3_prepare_v2(database, sqlstatement, -1, &compliedstatement, NULL)==SQLITE_OK
我期待數據被添加到DB
,但它不是,我也期待顯示一個UIAlertView
以告訴用戶ERROR OS SUCCESS。我希望你能看到我沒有的東西。
- (IBAction)addData:(id)sender {
NSString *n = [[NSString alloc] initWithString:[name text]];
NSString *a = [[NSString alloc] initWithString:[age text]];
NSString *c = [[NSString alloc] initWithString:[color text]];
NSLog(@"%@ - %@ - %@",n,a,c);
[self insertDataName:n Age:a Color:c];
}
這個NSLog
如預期的那樣返回文本屬性。
- (IBAction)hide:(id)sender {
[name resignFirstResponder];
[age resignFirstResponder];
[color resignFirstResponder];
}
- (void)viewDidLoad
{
[super viewDidLoad];
DBName = @"mydatabase.sqlite";
NSArray *documentsPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDir = [documentsPaths objectAtIndex:0];
DBPath = [documentsDir stringByAppendingPathComponent:DBName];
}
-(void)checkAndCreateDB {
BOOL Success;
NSFileManager *fileManager = [NSFileManager defaultManager];
Success = [fileManager fileExistsAtPath:DBPath];
if(Success) {
NSLog(@"DB Found");
return;
}
NSLog(@"DB Not Found");
NSString *databasePathFromApp = [[[NSBundle mainBundle]resourcePath]stringByAppendingPathComponent:DBName];
[fileManager copyItemAtPath:databasePathFromApp toPath:DBPath error:nil];
}
這NSLog
回報
-(void)insertData Name:(NSString*)n Age:(NSString*)a Color:(NSString*)c {
[self checkAndCreateDB];
sqlite3 *database;
if (sqlite3_open([DBPath UTF8String],&database)==SQLITE_OK) {
NSString *statement;
sqlite3_stmt *compliedstatement;
statement = [[NSString alloc] initWithFormat:@"insert into table1 values ('%@', '%@', '%@')",n,a,c];
const char *sqlstatement = [statement UTF8String];
NSLog(@"%@",statement);
if (sqlite3_prepare_v2(database, sqlstatement, -1, &compliedstatement, NULL)==SQLITE_OK) {
if (SQLITE_DONE!=sqlite3_step(compliedstatement)) {
NSAssert1(0, @"Error by inserting '%s'", sqlite3_errmsg(database));
UIAlertView *AlertOK = [[UIAlertView alloc] initWithTitle:@"Error!" message:@"Error by inserting" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[AlertOK show];
}
else {
UIAlertView *AlertOK = [[UIAlertView alloc] initWithTitle:@"Success!" message:@"Data successfully inserted" delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil];
[AlertOK show];
}
}
sqlite3_finalize(compliedstatement);
}
sqlite3_close(database);
}
而最後NSLog
上面顯示insert into table1 values ('n', 'a', 'c')
爲我所期望的。
插入時出現錯誤,我無法弄清楚。
僅供參考數據庫是使用SQLiteManager創建的。 SS下面:
你能更具體的到底發生了什麼?你的陳述已經準備好,但是你面對的是什麼樣的錯誤?這是(SQLITE_DONE!= sqlite3_step(compliedstatement))執行?那麼發生了什麼? – Byte 2012-01-27 20:28:47
我得到了'UIAlertView'成功,但是當我在SQLiteManager中打開我的數據庫並從'table1'中選擇*時,有0個條目。 – 2012-01-28 00:08:36