Binding picture box with column with oracle

Question

con = new OleDbConnection("provider=oraoledb.oracle.1;user id=scott;password=tiger");
daEmp = new OleDbDataAdapter("select * from emp", con);
daDept = new OleDbDataAdapter("select * from dept", con);
//----------------------------
ds = new DataSet();
//---------------------------------------
daEmp.Fill(ds, "emp");
dataGridView1.DataSource = ds.Tables["emp"];
//-------------------------------------------
daDept.Fill(ds, "dept");
cmbDname.DataSource = ds.Tables["dept"];
cmbDname.DisplayMember = "dname";
cmbDname.ValueMember = "deptno";
//-------------------------------------------------
pictureBox1.DataBindings.Add("Image", ds.Tables["emp"], "photo2", true, DataSourceUpdateMode.OnPropertyChanged);
txtEmpno.DataBindings.Add("text", ds.Tables["emp"], "empno");
txtEname.DataBindings.Add("text", ds.Tables["emp"], "ename");
txtSal.DataBindings.Add("text", ds.Tables["emp"], "sal");
cmbDname.DataBindings.Add("selectedvalue", ds.Tables["emp"], "deptno");
dtpHireDate.DataBindings.Add("text", ds.Tables["emp"], "hiredate");
txtJob.DataBindings.Add("text", ds.Tables["emp"], "job");
OleDbCommandBuilder cmb = new OleDbCommandBuilder(daEmp);
bmb = this.BindingContext[ds.Tables["emp"]];
}

Im using the above code to insert picture of employee but when i Try to save it using

bmb.EndCurrentEdit();
daEmp.Update(ds.Tables["emp"]);

Im getting an error Dynamic SQL generation for the UpdateCommand is not supported against a SelectCommand that does not return any key column information.

 

I have tried to change the data type in Oracle from blob to long raw but Im getting the same issue.

 

Could u plz let me know what is the error