Question

我有一个MySQL的插入查询：

mySqlCommand = mySqlConnect.CreateCommand();
mySqlCommand.CommandText = "INSERT INTO MajorEquipment(EquipmentType, PACId, EquipmentNumber, EquipmentDsc) "
    + "SELECT @EquipmentType, (SELECT PACId FROM PlantAreaCodes WHERE AreaCode = @Location), @EquipmentNumber, @EquipmentDsc "
    + "FROM DUAL WHERE NOT EXISTS (SELECT * FROM MajorEquipment "
    + "WHERE EquipmentNumber = @EquipmentNumber;";

mySqlCommand.Parameters.Add("@EquipmentNumber", MySqlDbType.VarChar);
mySqlCommand.Parameters.Add("@Location", MySqlDbType.VarChar);
mySqlCommand.Parameters.Add("@EquipmentType", MySqlDbType.VarChar);
mySqlCommand.Parameters.Add("@EquipDsc", MySqlDbType.VarChar);

mySqlCommand.Parameters["@EquipmentNumber"].Value = MeModel.EquipmentNumber; //string
mySqlCommand.Parameters["@Location"].Value = MeModel.Location;               //string
mySqlCommand.Parameters["@EquipmentType"].Value = MeModel.EquipmentType;     //string
mySqlCommand.Parameters["@EquipDsc"].Value = MeModel.Notes;                  //string

mySqlCommand.ExecuteNonQuery(); // error

每当我尝试在这里执行时，我都会

命令执行期间遇到致命错误。

并没有进一步的解释。但是如果我执行完全相同的查询，甚至几乎直接将其剪切并粘贴到MySQL中，它就会顺利执行。发生了什么事？

MySQL＆＃34;命令执行期间遇到的致命错误＆＃34;用c＃查询

0 个答案: