OCCI, Timestamp and Updates

Question

Hello,
I need some help with using Timestamps in an update where clause.
I created a table author_ag as
Name Null? Type
TS TIMESTAMP(3)
AUTHOR_NAME VARCHAR2(25)
I wrote a test program where I first insert two rows into the table.
I update the TS field in both the rows.
For the first row, I update using the author_name field in the where clause.
For the second row, I use the TS field in the where clause.
Here is the code snippet:
Timestamp tsy1(env, 2003,12,13,10,11,12, 123*1000*1000);
Timestamp tsy2(env, 2004,12,13,10,11,12, 456*1000*1000);
Timestamp ts (env, 2009, 9, 9, 9, 9, 9, 321*1000*1000);
//Insert 2 rows.
try{
string insertStmt = "Insert into author_ag values (:p1, :p2)";
Statement* stmti= conn->createStatement(insertStmt);
stmti->setTimestamp(1,tsy1);
stmti->setString(2,"HELLO");
stmti->executeUpdate ();
stmti->setTimestamp(1,tsy2);
stmti->setString(2,"WORLD");
stmti->executeUpdate ();
conn->terminateStatement (stmti);
catch(SQLException & ex)
std::cout << "Caught an exception" << ex.getMessage() << endl;
// update using author_name
try
string sqlStmt1 =
"UPDATE author_ag SET ts = :x WHERE author_name = :y";
Statement* stmtu1 = conn->createStatement (sqlStmt1);
stmtu1->setTimestamp (1, ts);
stmtu1->setString (2, "HELLO");
stmtu1->executeUpdate ();
conn->terminateStatement (stmtu1);
catch(SQLException & ex)
std::cout << "Caught an exception 2" << ex.getMessage() << endl;
//update using timestamp
try
string sqlStmt2 =
"UPDATE author_ag SET ts = :x WHERE ts = :y";
Statement* stmtu2 = conn->createStatement (sqlStmt2);
stmtu2->setTimestamp (1, ts);
stmtu2->setTimestamp (2, tsy2);
stmtu2->executeUpdate ();
conn->terminateStatement (stmtu2);
catch(SQLException & ex)
std::cout << "Caught an exception 3" << ex.getMessage() << endl;
std::cout << "Everything ran fine?" << endl;
What I find is that the first update takes place, but the second update doesn't.
09-SEP-09 09.09.09.3 HELLO
13-DEC-04 10.11.12.4 WORLD <---------No Update
What am I missing?

Answer 1

Yes, I tried the test with TIMESTAMP WITH TIME ZONE and it works wonderfully.
However, I cannot change the column type from TIMESTAMP to TIMESTAMP WITH TIME ZONE.
I am using oracle 10.2.0.3.0 on linux.
Q1: What is the difference between the two types in terms of performance and storage?
Q2: Is this a known issue or use of TIMESTAMP an undesirable usage?