How to read a CLOB column in Oracle using OleDb ?

Posted by T.Falise on Stack Overflow See other posts from Stack Overflow or by T.Falise
Published on 2010-03-29T11:56:14Z Indexed on 2010/03/29 12:33 UTC
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Hi,

I have created a table on an Oracle 10g database with this structure :

create table myTable
(
id       number(32,0)      primary key,
myData   clob
)

I can insert rows in the table without any problem, but when I try to read data from the table using OleDb connection, I get an exception.

Here is the code I use :

using (OleDbConnection dbConnection = new OleDbConnection("ConnectionString"))
{
    dbConnection.Open();

    OleDbCommand dbCommand = dbConnection.CreateCommand();

    dbCommand.CommandText = "SELECT * FROM myTable WHERE id=?";
    dbCommand.Parameters.AddWithValue("ID", id);

    OleDbDataReader dbReader = dbCommand.ExecuteReader();
}

The exception details seems to point on an unsupported data type :

System.Data.OleDb.OleDbException: 
Unspecified error Oracle error occurred, but error message could not be retrieved from Oracle. 
Data type is not supported.

Does anyone know how I can read this data using the OleDb connection ?

PS : The driver used in this case is the Microsoft one.

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