OleDbCommand with Parameters

Hi,

I have application connected to MS Access DB using OleDB. When creating commands (Insert/Update/Select) I use OleDbParamater class to insert data into command. Examples :

Select ::

OleDbCommand select_cmd = new OleDbCommand("SELECT * FROM " + ObjectTable.TableName + " WHERE " +
ObjectTable.idObject + "=@." + ObjectTable.idObject + " AND " +
ObjectTable.idObjectUnder + "=@." + ObjectTable.idObjectUnder);

Update ::

OleDbCommand update_cmd = new OleDbCommand("Update " + ObjectTable.TableName + " SET " +
ObjectTable.idParent + "=@." + ObjectTable.idParent + " , " +
ObjectTable.idParentUnder + "=@." + ObjectTable.idParentUnder + " , " +
ObjectTable.License + "=@." + ObjectTable.License + " , " +
ObjectTable.Type + "=@." + ObjectTable.Type + " ," +
ObjectTable.Language + "=@." + ObjectTable.Language + " , " +
ObjectTable.Name + "=@." + ObjectTable.Name + " , " +
ObjectTable.Checksum + "=@." + ObjectTable.Checksum + " , " +
ObjectTable.VText + "=@." + ObjectTable.VText + " , " +
ObjectTable.VInt + "=@." + ObjectTable.VInt + " WHERE " +
ObjectTable.idObject + "=@." + ObjectTable.idObject + " AND " +
ObjectTable.idObjectUnder + "=@." + ObjectTable.idObjectUnder);

Parametes:: (Adding in separate method -> AddParameters(OleDbCommand command); )

command.Parameters.Add("@." + ObjectTable.idObject, OleDbType.BigInt).Value = this.IDUpper;
command.Parameters.Add("@." + ObjectTable.idObjectUnder, OleDbType.BigInt).Value = this.IDUnder;
command.Parameters.Add("@." + ObjectTable.Name, OleDbType.VarChar).Value = this.Name;
command.Parameters.Add("@." + ObjectTable.idParent, OleDbType.BigInt).Value = GetUpper(this.IDParent);
command.Parameters.Add("@." + ObjectTable.idParentUnder, OleDbType.BigInt).Value = GetUnder(this.IDParent);
command.Parameters.Add("@." + ObjectTable.License, OleDbType.BigInt).Value = this.License;
command.Parameters.Add("@." + ObjectTable.Language, OleDbType.BigInt).Value = this.Language;
command.Parameters.Add("@." + ObjectTable.Type, OleDbType.BigInt).Value = (int)this.Type;

command.Parameters.Add("@." + ObjectTable.VText, OleDbType.VarChar).Value = String.IsNullOrEmpty(this.VText) ? null : this.VText;
command.Parameters.Add("@." + ObjectTable.VInt, OleDbType.BigInt).Value = this.VInt;
command.Parameters.Add("@." + ObjectTable.Checksum, OleDbType.BigInt).Value = this.Checksum;

Question: Does the order of adding parameters to command matter? Because allways when the order of parameters added is diffrent from order in command text, I get weird Exceptions . I thought that the name matters, not the order, but it seems that system doesn't care about the parameter's name, it just picks next parameter in command.Parameters when putting values. How is it?Do you mean that if it could matter during the addition of the parameters ? It does not, as the .add method only puts the parameter in the collection.

HTH, Jens K. Suessmeyer.

http://www.sqlserver2005.de|||You know what? It does. And it is the only thing that matters (talking about OleDb) -> ORDER. Despite of using names (I could questionmarks instead of parameter's names). I've done this using Oracle DB and (of cource) namespace and everything worked fine, but OleDb looks to handle thing in it's own weird way. Example :

OleDbCommand selectCmd = new OleDbCommand( "Select * from Customers where CustomerName=@.name AND CustomerAge=@.age);

selectCmd.Parameters.Add("@.age", OleDbType.Integer).Value = 20;

selectCmd.Parameters.Add("@.name", OleDbType.VarChar).Value = "Michael";

this is NOT going to work !!! If the order of parameters added to command's parameters collection is diffrent from order of parameters used in command itself, it won't work.

OleDB Connection Class in Custom Task?

I have OLE DB Connections set up in my connection manager (Native OLE DB\Microsoft OLE DB Provider for SQL Server). I would like to reference and query these connections from a custom task, written in C#. I currently reference it as follows:

using System.Data.OleDb;

...................................

OleDbConnection connection = (OleDbConnection) connections["MyConnection"].AcquireConnection(null);

What may be obvious to some (though wasn't to me, as I am new at this), when I run the task, I get an error saying that I cannot make this cast. After perusing the boards, I understand that this is because I am not making a cast to the right connection type. Well, that is where I am lost. What connection type (and corresponding library) do I need to reference? I want to continue to use the "Native OLE DB..." connection.

Thanks!

The OleDb connection manager is for tasks and data flow components that use unmanaged OleDb API.
Since you want managed connection object, use ADO.NET connection manager, select the same provider (Native OLE DB\Microsoft OLE DB Provider for SQL Server).

|||Makes sense. I don't know much about connection managers, but this helps. I'll give it a shot. Thanks!