I have problem delete data microsoft access database with C# I use this method to add data to microsoft access database
public static int autoIncrement(string kalimatSql)
{
int lastIndex = -1;
dbCon.Open();
dbCmd.CommandText = kalimatSql;
dbCmd.ExecuteNonQuery();
dbCmd.CommandText = "Select @@Identity";
lastIndex = Convert.ToInt32(dbCmd.ExecuteScalar());
dbCon.Close();
return lastIndex;
}
I call that method with
myQuiz.id = Global.autoIncrement("INSERT INTO Quizzes (Name) VALUES ('" + myQuiz.name + "')");
Global.quizzes.Add(myQuiz);
I wonder how to delete data from database? if I add with that way?
So far I already try this way
public static int deleteData(string kalimatSQL)
{
int lastIndex = -1;
dbCon.Open();
dbCmd.CommandText = kalimatSQL;
dbCmd.ExecuteNonQuery();
dbCon.Close();
return lastIndex;
}
And I call delete method with this way
if ( listBoxQuizzes.SelectedIndex != -1) {
Global.deleteData("DELETE FROM Quizzes WHERE name=" +listBoxQuizzes.SelectedItem.ToString());
}
But give error result
"C# Syntax error (missing operator) in query expression 'name = quiz002' " can someone help me fix it?
You are missing single quotes around name value ( ''
)
It should be like this:
Global.deleteData("DELETE FROM Quizzes WHERE name = '" + listBoxQuizzes.SelectedItem.ToString() + "'");
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.