[英]C# delete database ms.access
I have problem delete data microsoft access database with C# I use this method to add data to microsoft access database 我有问题删除数据微软访问数据库与C#我使用此方法将数据添加到微软访问数据库
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 我用这个方法称呼
myQuiz.id = Global.autoIncrement("INSERT INTO Quizzes (Name) VALUES ('" + myQuiz.name + "')");
Global.quizzes.Add(myQuiz);
I wonder how to delete data from database? 我想知道如何从数据库中删除数据? if I add with that way? 如果我这样添加?
So far I already try this way 到目前为止,我已经尝试过这种方式
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 我用这种方式调用delete方法
if ( listBoxQuizzes.SelectedIndex != -1) {
Global.deleteData("DELETE FROM Quizzes WHERE name=" +listBoxQuizzes.SelectedItem.ToString());
}
But give error result 但是给出错误结果
"C# Syntax error (missing operator) in query expression 'name = quiz002' " can someone help me fix it? “查询表达式'name = quiz002'中的C#语法错误(缺少运算符)”有人可以帮我修复它吗?
You are missing single quotes around name value ( ''
) 您缺少名称值( ''
)周围的单引号
It should be like this: 它应该是这样的:
Global.deleteData("DELETE FROM Quizzes WHERE name = '" + listBoxQuizzes.SelectedItem.ToString() + "'");
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