A statement is not refreshed as if Statement Caching was enabled

Question

Here is the c# code:
OracleConnection conn = null;
OracleCommand cmd;
OracleDataReader reader = null;
string tname;
conn = new OracleConnection("Data Source=ora10gen;User ID=scott;Password=tiger;");
conn.Open();
cmd = conn.CreateCommand();
cmd.CommandText = "drop table testblob";
cmd.ExecuteNonQuery();
cmd.CommandText = "create table testblob (idfld integer not null, col_bin clob)";
cmd.ExecuteNonQuery();
cmd.CommandText = "insert into testblob(idfld,col_bin) values(1,empty_clob())";
cmd.ExecuteNonQuery();
cmd.CommandText = "select col_bin, rowid from testblob";
reader = cmd.ExecuteReader();
reader.Read();
//I get the type name is "clob"
tname = reader.GetDataTypeName(0);
reader.Close();
//now I recreate the table and change column cob_bin type to blob
cmd.CommandText = "drop table testblob";
cmd.ExecuteNonQuery();
cmd.CommandText = "create table testblob (idfld integer not null, col_bin blob null)";
cmd.ExecuteNonQuery();
cmd.CommandText = "insert into testblob(idfld,col_bin) values(1,empty_blob())";
cmd.ExecuteNonQuery();
cmd.CommandText = "select col_bin, rowid from testblob";
reader = cmd.ExecuteReader();
reader.Read();
//after read(), I get an exception "ORA-00932: inconsistent datatypes: expected CLOB got BLOB"
tname = reader.GetDataTypeName(0);
reader.Close();
//seems data type of col_bin is not refreshed in client.

Answer 1

See the response to the following forum item:
Oracle returning incorrect schema information ?
Matthew Solnit Mar 19, 2005 1:28 AM by: IT Panther »
If this is important to you there is some workaround code listed in previous item but this may not work in the future.....