Question

我正在尝试使用C＃执行以下Mysql查询。

我尝试了两种方法。

方法1

"INSERT INTO gpsRecent
                    (set_date, set_time, type, asset_id, asset_name, asset_type, gps_lat, gps_lon,             
                     gps_knots, gps_mph, gps_kph, gps_heading, gps_alert, gps_time, set_timestamp, 
                     gps_poll, ign_indicate, batt_charge, batt_level, client_id, group_id,       
                     message_read) 
                    VALUES(" + gps_setDate + ", " + gps_setTime + ", " + gps_type + ", " +   
                    gps_assetId + ", " + gps_assetName + ", " + gps_assetType + ", "
                    + gps_lat + ", " + gps_lon + ", " + gps_knots + ", " + gps_mph + ", " + gps_kph 
                    + ", " + gps_heading + ", " + Convert.ToBoolean(gps_alert) + ", " + Convert.ToString(gps_time) + ", " + gps_setTimestamp + ", " 
                             + Convert.ToBoolean(gps_poll) + ", " + Convert.ToBoolean(gps_ignIndicate) + ", " + Convert.ToBoolean(gps_battCharge) + ", " 
                             + Convert.ToInt16(gps_battLevel) + ", " + gps_clientId + ", " + gps_groupId + ", " + gps_messRead + @")
                    ON DUPLICATE KEY 
                    UPDATE  
                    set_date = VALUES(set_date), set_time = VALUES(set_time), type = VALUES(type), asset_id = VALUES(asset_id), asset_name = VALUES(asset_name), 
                    asset_type = VALUES(asset_type), gps_lat = VALUES(gps_lat), gps_lon = VALUES(gps_lon), gps_knots = VALUES(gps_knots), gps_mph = VALUES(gps_mph), 
                    gps_kph = VALUES(gps_kph), gps_heading = VALUES(gps_heading), gps_alert = VALUES(gps_alert), gps_time = VALUES(gps_time), set_timestamp = VALUES(set_timestamp), 
                    gps_poll = VALUES(gps_poll), ign_indicate = VALUES(ign_indicate), batt_charge = VALUES(batt_charge), batt_level = VALUES(batt_level), client_id = VALUES(client_id),
                    group_id = VALUES(group_id), message_read = VALUES(message_read)
                    WHERE asset_id = '" + gps_assetId + "' AND client_id = '" + gps_clientId + "';";

方法2

      "INSERT INTO gpsRecent
                (set_date, set_time, type, asset_id, asset_name, asset_type, gps_lat, gps_lon, gps_knots, gps_mph, gps_kph, gps_heading, 
                gps_alert, gps_time, set_timestamp, gps_poll, ign_indicate, batt_charge, batt_level, client_id, group_id, message_read) 
                VALUES(@set_date, @set_time, @type, @asset_id, @asset_name, @asset_type, @gps_lat, @gps_lon, @gps_knots, @gps_mph, @gps_kph, @gps_heading, 
                @gps_alert, @gps_time, @set_timestamp, @gps_poll, @ign_indicate, @batt_charge, @batt_level, @client_id, @group_id, @message_read)
                ON DUPLICATE KEY 
                UPDATE  
                set_date = VALUES(set_date), set_time = VALUES(set_time), type = VALUES(type), asset_id = VALUES(asset_id), asset_name = VALUES(asset_name), 
                asset_type = VALUES(asset_type), gps_lat = VALUES(gps_lat), gps_lon = VALUES(gps_lon), gps_knots = VALUES(gps_knots), gps_mph = VALUES(gps_mph), 
                gps_kph = VALUES(gps_kph), gps_heading = VALUES(gps_heading), gps_alert = VALUES(gps_alert), gps_time = VALUES(gps_time), set_timestamp = VALUES(set_timestamp), 
                gps_poll = VALUES(gps_poll), ign_indicate = VALUES(ign_indicate), batt_charge = VALUES(batt_charge), batt_level = VALUES(batt_level), client_id = VALUES(client_id),
                group_id = VALUES(group_id), message_read = VALUES(message_read)
                WHERE asset_id = '" + gps_assetId + "' AND client_id = '" + gps_clientId + "';";

         MySqlCommand comm_gpsRecent = new MySqlCommand(Entry_gpsRecent, Con_gpsRecent);
        //comm_gpsRecent.Prepare();  
        //inserting each element from GPS split message into its repective table and column in the Track24 database
        comm_gpsRecent.Parameters.AddWithValue("@set_date", gps_setDate);
        comm_gpsRecent.Parameters.AddWithValue("@set_time", gps_setTime);
        comm_gpsRecent.Parameters.AddWithValue("@type", gps_type);
        comm_gpsRecent.Parameters.AddWithValue("@asset_id", gps_assetId);
        comm_gpsRecent.Parameters.AddWithValue("@asset_name", gps_assetName);
        comm_gpsRecent.Parameters.AddWithValue("@asset_type", gps_assetType);
        comm_gpsRecent.Parameters.AddWithValue("@gps_lat", gps_lat);
        comm_gpsRecent.Parameters.AddWithValue("@gps_lon", gps_lon);
        comm_gpsRecent.Parameters.AddWithValue("@gps_knots", gps_knots);
        comm_gpsRecent.Parameters.AddWithValue("?@gps_mph", gps_mph);
        comm_gpsRecent.Parameters.AddWithValue("@gps_kph", gps_kph);
        comm_gpsRecent.Parameters.AddWithValue("@gps_heading", gps_heading);
        comm_gpsRecent.Parameters.AddWithValue("@gps_alert", Convert.ToBoolean(gps_alert));
        comm_gpsRecent.Parameters.AddWithValue("@gps_time", Convert.ToString(gps_time));
        comm_gpsRecent.Parameters.AddWithValue("@set_timestamp", gps_setTimestamp);
        comm_gpsRecent.Parameters.AddWithValue("@gps_poll", Convert.ToBoolean(gps_poll));
        comm_gpsRecent.Parameters.AddWithValue("@ign_indicate", Convert.ToBoolean(gps_ignIndicate));
        comm_gpsRecent.Parameters.AddWithValue("@batt_charge", Convert.ToBoolean(gps_battCharge));
        comm_gpsRecent.Parameters.AddWithValue("@batt_level", Convert.ToInt16(gps_battLevel));
        comm_gpsRecent.Parameters.AddWithValue("@client_id", gps_clientId);
        comm_gpsRecent.Parameters.AddWithValue("@group_id", gps_groupId);
        comm_gpsRecent.Parameters.AddWithValue("@message_read", gps_messRead);

comm_gpsRecent.ExecuteNonQuery（）; //执行上面的INSERT查询将数据放入gpsRecent

但是当我尝试执行它时，我收到一条错误，指出MySql语法不正确。

有人可以告诉我我做错了什么。

Answer 1

这可能是因为最后的“WHERE”声明。作为MySQL规范，在ON DUPLICATE KEY UPDATE中没有这样的东西。在DUPLICATE KEY上，您可以无条件地定义复制的每一行的内容。

Answer 2

MySQL不允许将WHERE子句与INSERT... ON DUPLICATE KEY... UPDATE一起使用。

This question解决了同样的问题，提供的解决方案是使用IF()。检查this link（也在该问题的接受答案中指定），了解有关如何使用IF()包含您需要指定的条件的详细信息。

Mysql On Duplicate Key Update Query Error

2 个答案: