C# 我需要查询生成器c中的帮助-删除不起作用

我有一个c和ms access的小项目。我使用查询生成器在ms access中管理我的表

问题是，select查询工作正常，update查询工作正常，但delete不工作，并且没有错误消息

请帮忙

 public DataSet Update(DataSet ds)
        {
            using (cn)
            {
                OleDbDataAdapter adapter = new OleDbDataAdapter();
                string queryString = "SELECT [taskId],[resourceId] FROM [mytable]";
                cn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + _conStrName + ";User Id=admin;Password=;";
                OleDbConnection connection = new OleDbConnection(cn.ConnectionString);
                adapter.SelectCommand = new OleDbCommand(queryString, connection);
                adapter.SelectCommand.CommandText = queryString;

                OleDbCommandBuilder builder = new OleDbCommandBuilder(adapter);

                adapter.Update(ds.Tables["mytable";"]);

                return ds;
            }

使用：

---

如果您正在使用OleDb，请尝试以下操作：

    public static int DeleteStudentInfo(long studentNum)
    {
        var cmd = new OleDbCommand("DELETE FROM Students WHERE studentID = @studentId");
        cmd.Parameters.Add("@studentId", OleDbType.BigInt).Value = studentNum;
        return CallNonQuery(cmd);
    }

    private static int CallNonQuery(OleDbCommand query)
    {
        int rowsAffected;
        var conn = new OleDbConnection(ConfigSettingsManager.DBConnectionString);
        query.Connection = conn;
        try
        {
            conn.Open();
            rowsAffected = query.ExecuteNonQuery();
        }
        catch (Exception)
        {
            return -1;
        }
        finally
        {
            conn.Close();
        }
        return rowsAffected;
    }

---

将ConfigSettingsManager.DBConnectionString替换为您的连接字符串。

请发布不起作用的SQL代码。您尝试使用的代码示例会有所帮助，您希望人们如何诊断您的问题？公共数据集更新数据集ds{using cn{OleDbDataAdapter=新建OleDbDataAdapter；字符串queryString=从[mytable]中选择[taskId]，[resourceId]；cn.ConnectionString=Provider=Microsoft.Jet.OLEDB.4.0；数据源=+\u conStrName+；用户Id=admin；密码=；；OleDbConnection connection=new OleDbConnectioncn.ConnectionString；adapter.SelectCommand=new OleDbCommandqueryString，connection；我从这里获取了代码，无需修改写入删除…………因为我使用命令生成器

DELETE FROM Store_Information WHERE store_name = "Los Angeles"

    public static int DeleteStudentInfo(long studentNum)
    {
        var cmd = new OleDbCommand("DELETE FROM Students WHERE studentID = @studentId");
        cmd.Parameters.Add("@studentId", OleDbType.BigInt).Value = studentNum;
        return CallNonQuery(cmd);
    }

    private static int CallNonQuery(OleDbCommand query)
    {
        int rowsAffected;
        var conn = new OleDbConnection(ConfigSettingsManager.DBConnectionString);
        query.Connection = conn;
        try
        {
            conn.Open();
            rowsAffected = query.ExecuteNonQuery();
        }
        catch (Exception)
        {
            return -1;
        }
        finally
        {
            conn.Close();
        }
        return rowsAffected;
    }