Question

我正在使用此方法在表中插入一行：

            MySqlConnection connect = new MySqlConnection(connectionStringMySql);
            MySqlCommand cmd = new MySqlCommand();

            cmd.Connection = connect;
            cmd.Connection.Open();

            string commandLine = @"INSERT INTO Wanted (clientid,userid,startdate,enddate) VALUES" +
                "(@clientid, @userid, @startdate, @enddate);";
            cmd.CommandText = commandLine;

            cmd.Parameters.AddWithValue("@clientid", userId);
            cmd.Parameters.AddWithValue("@userid", "");
            cmd.Parameters.AddWithValue("@startdate", start);
            cmd.Parameters.AddWithValue("@enddate", end);

            cmd.ExecuteNonQuery();
            cmd.Connection.Close();

我还拥有Auto Increment的id列。我想知道是否有可能获得插入新行时创建的id。

Answer 1

您可以访问MySqlCommand LastInsertedId属性。

cmd.ExecuteNonQuery();
long id = cmd.LastInsertedId;

Answer 2

MySqlConnection connect = new MySqlConnection(connectionStringMySql);
MySqlCommand cmd = new MySqlCommand();

cmd.Connection = connect;
cmd.Connection.Open();

string commandLine = @"INSERT INTO Wanted (clientid,userid,startdate,enddate) "
    + "VALUES(@clientid, @userid, @startdate, @enddate);";
cmd.CommandText = commandLine;

cmd.Parameters.AddWithValue("@clientid", userId);
**cmd.Parameters["@clientid"].Direction = ParameterDirection.Output;**
cmd.Parameters.AddWithValue("@userid", "");
cmd.Parameters.AddWithValue("@startdate", start);
cmd.Parameters.AddWithValue("@enddate", end);

cmd.ExecuteNonQuery();
cmd.Connection.Close();

Answer 3

基本上你应该将它添加到CommandText的末尾：

SET @newPK = LAST_INSERT_ID();

并添加另一个ADO.NET参数“newPK”。执行命令后，它将包含新ID。

C＃使用自动增量获取插入ID

3 个答案: