I'm trying to convert :
command.Parameters.Add (new SqliteParameter (DbType.Int32) { Value = id });
To a normal SqlParameter :
command.Parameters.Add(new SqlParameter(DbType.Int32) { Value = id });
I've managed to convert every line now besides this one, I'm getting these errors :
Error 3 Argument 1: cannot convert from 'System.Data.DbType' to 'object[]'
Error 2 The best overloaded method match for 'System.Data.SqlClient.SqlParameter.SqlParameter(object[])' has some invalid arguments
Full function code :
public User GetUser(int id)
{
var u = new User();
lock (locker)
{
connection = new SqlConnection("Data Source=" + path + ";Initial Catalog=DB;User ID=sa;Password=***********th");
connection.Open();
using (var command = connection.CreateCommand())
{
command.CommandText = "Select * from tblUsers WHERE UserID = ?";
command.Parameters.Add(new SqlParameter(DbType.Int32) { Value = id });
var r = command.ExecuteReader();
while (r.Read())
{
u = FromReader(r);
break;
}
}
connection.Close();
}
return u;
}
I think you are looking something this;
command.Parameters.Add(new SqlParameter("@YourParameterName", SqlDbType.Int32).Value = id;
After edit your question;
You can use AddWithValue
method. Add(String, Object)
method is obsolete. like;
command.CommandText = "Select * from tblUsers WHERE UserID = @id";
command.Parameters.AddWithValue("@id", id);
If you use SQL Server as a database, you should named your parameter add it to AddWithValue
with the same name.
When you use OleDbCommand
, order of parameter is important. Because as MSDN
says:
The OLE DB .NET Provider does not support named parameters for passing parameters to an SQL statement or a stored procedure called by an OleDbCommand when CommandType is set to Text. In this case, the question mark (?) placeholder must be used. For example:
SELECT * FROM Customers WHERE CustomerID = ?
Therefore, the order in which OleDbParameter objects are added to the OleDbParameterCollection must directly correspond to the position of the question mark placeholder for the parameter in the command text.
来源:https://stackoverflow.com/questions/20870628/right-syntax-of-sqlparameter