我正在嘗試使用Objective-c在Xcode中創建SQLite數據庫,但我在創建表時遇到問題。我相信我的插入功能是正確的,但是當我嘗試運行它時,出現以下錯誤:在Objective-C中創建SQLite數據庫時出錯Error
2016-09-20 09:39:31.612測試[58546:5169036]無法準備語句: :用戶
我的代碼在這裏。如果知道我可能做錯了,請告訴我。謝謝!
[super viewDidLoad];
//do any addtional setup after view load, typically from nib
NSString *docsDir;
NSArray *dirPaths;
//gets the directory
dirPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
docsDir = dirPaths[0];
//Build path to keep database
_databasePath = [[NSString alloc] initWithString:[docsDir stringByAppendingPathComponent:@"Users.db"]];
NSFileManager *filemgr = [NSFileManager defaultManager];
if([filemgr fileExistsAtPath:_databasePath] == NO) {
const char *dbPath = [_databasePath UTF8String];
if(sqlite3_open(dbPath, &_DB) == SQLITE_OK) {
char *errorMessage;
const char *sqlStatement = "CREATE TABLLE IF NOT EXIST Users (Username TEXT PRIMARY KEY, PASSWORD TEXT, EMAIL TEXT, null PHONE TEXT, null WINS INTEGER, null LOSSES INTEGER, null BALANCE DECIMAL INTEGER";
if(sqlite3_exec(_DB, sqlStatement, NULL, NULL, &errorMessage) != SQLITE_OK) {
//below creates a popup success message if necessary
UIAlertController * alert= [UIAlertController
alertControllerWithTitle:@"Success"
message:@"Table created"
preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction* ok = [UIAlertAction
actionWithTitle:@"OK"
style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action)
{
[alert dismissViewControllerAnimated:YES completion:nil];
}];
[alert addAction:ok];
[self presentViewController:alert animated:YES completion:nil];
}
sqlite3_close(_DB);
}
else {
//below creates a popup error message if necessary
UIAlertController * alert= [UIAlertController
alertControllerWithTitle:@"Error"
message:@"Unable to create table"
preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction* ok = [UIAlertAction
actionWithTitle:@"OK"
style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action)
{
[alert dismissViewControllerAnimated:YES completion:nil];
}];
[alert addAction:ok];
[self presentViewController:alert animated:YES completion:nil];
}
}
}
對不起有任何混淆,只是爲了澄清這是我創建數據庫的代碼。我相信這就是問題所在,因爲它表示當試圖運行我的插入時不會創建表「用戶」。 – dgelinas21
你在哪裏運行?在模擬器上?嘗試做一個乾淨的生成和卸載應用程序並再次運行? 2.如果問題仍然存在,請嘗試在更新之前運行select查詢以查看是否存在表名稱? –