Array Bind: nbr of updated rows?

Question

Hello,
when using array binding with UPDATE statements, how to look up the number of updated rows?
I couldn't find any parameter property such as ArrayBindAffectedRows.
Is it possible to use array bind with SQL statements which return values, e.g.:
UPDATE emp SET salary = salary + :increase
WHERE mgr = :mgrNo
RETURNING salary INTO :newSalary;
Hm, arrays :increase and :newSalary might have different lengths.
Thanks,
Armin

Answer 1

Ok this is genuinly tricky.
The only way I can think of to get this is to use FORALL and BULK COLLECT. This does an array-bound insert from PL/SQL. But you need to pass Associative Arrays from ODP.NET to PL/SQL to get this started.
Any other solution I could think of would require running some PL/SQL code for each update statement, for instance in a trigger. But avoiding the context switches from PL/SQL to SQL is a main reason to use array binding in the first place.
Here's a complete sample program:
I used inline PL/SQL for compactness, but you might want to save the block as a procedure.
using System;
using System.Data;
using Oracle.DataAccess.Client;
using Oracle.DataAccess.Types;
     public class Test
      static OracleConnection connect()
        string constr = "data source=oracle;user id=scott;password=tiger";
        OracleConnection con = new OracleConnection(constr);
        con.Open();
        return con;
    const string sql = @"
declare
  type NumTable is table of Number index by binary_integer;
  l_managers NumTable := :mgr;
  l_increase NumTable := :inc;
  l_newSals NumTable;
  l_records int;
begin
  forall idx in l_managers.first .. l_managers.last
    update emp
    SET
    sal = sal + l_increase(idx)
    WHERE mgr = l_managers(idx)
    RETURNING sal BULK COLLECT INTO l_newSals;
  :records_affected := l_newSals.count;
end;
    [STAThread]
    static void Main(string[] args)
      try
        using (OracleConnection con = connect())
          string cr = new String(new char[] {(char)13});
          OracleCommand cmd = new OracleCommand(sql.Replace(cr,""),con);
          OracleDecimal[] increases = new OracleDecimal[] {10,20,30};
          int[] managers = new int[] { 7698,7839,7782};
         OracleParameter pMgr = cmd.Parameters.Add("manager",
             OracleDbType.Int32,
             ParameterDirection.Input);
          pMgr.CollectionType = OracleCollectionType.PLSQLAssociativeArray;
          pMgr.Size = managers.Length;
          pMgr.Value = managers;
          OracleParameter pInc = cmd.Parameters.Add("increase",
             OracleDbType.Decimal,
             ParameterDirection.Input);
          pInc.CollectionType = OracleCollectionType.PLSQLAssociativeArray;
          pInc.Size = increases.Length;
          pInc.Value = increases;
          OracleParameter pRecs = cmd.Parameters.Add("records",
             OracleDbType.Int32 ,
             ParameterDirection.Output);
          pRecs.CollectionType = OracleCollectionType.None;
          cmd.ExecuteNonQuery();
          int recs = (int)pRecs.Value;
          Console.WriteLine("{0} records affected",recs );
      catch (Exception ex)
        Console.WriteLine(ex);
}