我正在尝试使用Objective-c在Xcode中创建SQLite数据库,但我在创建表时遇到问题。我相信我的插入功能是正确的,但是当我尝试运行它时,出现以下错误:在Objective-C中创建SQLite数据库时出错Error
2016-09-20 09:39:31.612测试[58546:5169036]无法准备语句: :用户
我的代码在这里。如果知道我可能做错了,请告诉我。谢谢!
[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];
}
}
}
对不起有任何混淆,只是为了澄清这是我创建数据库的代码。我相信这就是问题所在,因为它表示当试图运行我的插入时不会创建表“用户”。 – dgelinas21
你在哪里运行?在模拟器上?尝试做一个干净的生成和卸载应用程序并再次运行? 2.如果问题仍然存在,请尝试在更新之前运行select查询以查看是否存在表名称? –