Here is my first experience with DbProviderFactory.
This worked great with the SqlClient but when I changed it to the IBM client it failed. It opened the connection but never returned rows, and if you executed the code more than once I would get an error, SQL0519 Prepared statement S000001.
After spending almost a day on this I found out that it would execute if I removed the comment or if added
before the ExecuteReader.
In another part of the code, where I was doing inserts, the .Prepare caused the SqlClient to complain about not setting .Size for variable length fields.
As a first experience this has not been good or I have done something wrong. Has anyone else done this or used DbProviderFactory extensively and know the gotchas?
The point of all of this was to prove how easy it would be to switch from (DB2, Sql, MySQL, etc.) to (DB2, Sql, MySQL, etc.).
One other thing, that may or may not be related to DbProviderFactory. Columns define as 'Time' on DB2 and SQL have different data types when read with the reader.
Code:
'Dim dbf As Data.Common.DbProviderFactory = Data.Common.DbProviderFactories.GetFactory("IBM.Data.DB2.iSeries")
Dim dbf As Data.Common.DbProviderFactory = Data.Common.DbProviderFactories.GetFactory("System.Data.SqlClient")
Dim conn As Data.Common.DbConnection = dbf.CreateConnection
conn.ConnectionString = "theconnectionstring"
Dim sql As XElement =
<sql>
--- test
SELECT * FROM Tablename
</sql>
Dim cmnd As Data.Common.DbCommand = dbf.CreateCommand
cmnd.CommandType = CommandType.Text
cmnd.CommandText = sql.Value.ToString
conn.Open()
Dim rdr As System.Data.Common.DbDataReader = cmnd.ExecuteReader
If rdr.HasRows Then
Do While rdr.Read
'blah, blah
Loop
End If
rdr.Close()
conn.Close()
conn.Dispose()After spending almost a day on this I found out that it would execute if I removed the comment or if added
Code:
cmnd.Prepare()In another part of the code, where I was doing inserts, the .Prepare caused the SqlClient to complain about not setting .Size for variable length fields.
As a first experience this has not been good or I have done something wrong. Has anyone else done this or used DbProviderFactory extensively and know the gotchas?
The point of all of this was to prove how easy it would be to switch from (DB2, Sql, MySQL, etc.) to (DB2, Sql, MySQL, etc.).
One other thing, that may or may not be related to DbProviderFactory. Columns define as 'Time' on DB2 and SQL have different data types when read with the reader.