获取mssqlserver与access数据库插入的当前行的id

//mssqlserver

 public static int GetInsertId(string sql)

    {

        try

        {

            SqlCommand cmd = new SqlCommand();

            using (SqlConnection conn = new SqlConnection(connectionString))

            {

                PrepareCommand(cmd, conn, sql, null);

                cmd.ExecuteNonQuery();

                PrepareCommand(cmd, conn, "Select @@Identity", null);

                int val = Convert.ToInt32(cmd.ExecuteScalar());

                return val;

            }

        }

        catch (Exception err)

        {

            throw err;

        }



    }



private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, string CmdText, SqlTransaction trans)

    {

        try

        {

            if (conn.State != ConnectionState.Open)

            {

                conn.Open();

            }

            cmd.Connection = conn;

            cmd.CommandText = CmdText;

            if (trans != null)

            {

                cmd.Transaction = trans;

            }

            cmd.CommandType = CommandType.Text;

        }

        catch (Exception err)

        {

            throw err;

        }

    }



//access

public static int GetInsertId(string sql)

    {

        try

        {

            OleDbCommand cmd = new OleDbCommand();

            using (OleDbConnection conn = new OleDbConnection(ConnectionString))

            {

                PrepareCommand(cmd, conn, sql, null);

                cmd.ExecuteNonQuery();

                PrepareCommand(cmd, conn, "Select @@Identity", null);

                int val =Convert.ToInt32( cmd.ExecuteScalar());

                return val;

            }

        }

        catch (Exception err)

        {

            throw err;

        }

    

    }



public static void PrepareCommand(OleDbCommand cmd, OleDbConnection conn, string CmdText, OleDbTransaction trans)

    {

        try

        {

            if (conn.State != ConnectionState.Open)

            {

                conn.Open();

            }

            cmd.Connection = conn;

            cmd.CommandText = CmdText;

            if (trans != null)

            {

                cmd.Transaction = trans;

            }

            cmd.CommandType = CommandType.Text;

        }

        catch (Exception err)

        {

            throw err;

        }

    }

//还有一种可以用通过插入后查询当前表的最大id的方法获取，但是如果数据并发量大可能回出现问题