在Oracle SQL Developer中运行的SQL查询但是当我从我的JAVA程序运行查询时，它给出了Sql异常

Question

I am fetching some data using the following query

SELECT    
t.value_date,t.settlement_date,    
  (CASE WHEN NVL( t.settlement_date, '01-01-9999')='01-01-9999'
    THEN t.value_date
    ELSE t.settlement_date
  END) AS modified_value_date,    
  t.instrument_pk,    
  bct.base_ccy_pk,    
  i.contract_size,    
  lc.min_trading_unit AS min_trading_unit_lc,    
  bc.min_trading_unit AS min_trading_unit_bc    

FROM transaction t,    
  bc_transaction bct,    
  instrument i,    
  instrument lc,    
  instrument bc

WHERE t.status         = 'NORMAL'    
AND t.fund_pk          = 99436    
AND t.instrument_pk    = 235342    
AND t.instrument_pk    = i.instrument_pk    
AND t.local_ccy_pk     = lc.instrument_pk    
AND bct.transaction_pk = t.transaction_pk    
AND bct.base_ccy_pk    = bc.instrument_pk    
AND t.value_date      >= to_date('20121123000000','yyyymmddhh24miss')    
AND t.transaction_type = 'SECURITY_TRADE'    
ORDER BY modified_value_date,    
  t.processing_order,    
  t.txn_reference_no;

Problem is when im running the above query in Oracle SQL Developer it's giving the proper result. But when i am trying to run the query from my java program using PreparedStatement it is producing an exception like java.sql.SQLException: ORA-01843: not a valid month

My problem got solved when i replace the date in CASE bolck with

(CASE WHEN NVL(t.settlement_date,to_date('99990101000000','yyyymmddhh24miss'))=to_date('99990101000000','yyyymmddhh24miss') 
    THEN t.value_date 
    ELSE t.settlement_date 
  END) AS modified_value_date

Now My questions is

1. why there is such kind of discrepancy ?If the problem is with the to_date() then it should have given the same exception in SQL developer also.

2. The problem does not end here I saw when I m debugging my program from eclipse again the same query is running perfectly without to_date() in NVL block the I checked and found that my JDK is 1.5 but the JRE was 1.6.Then I changed my JRE to 1.5 and debug the same java program and found that it is producing the same exception ,for the same query without to_date() in NVL block, at the time of debugging.

   Now I m completely messed up why such kind of discrepancy between JRE 5 and JRE 6 ?

CAN ANYONE HELP ME?

Answer 1

It is not about JRE version but about your session settings. You have specified string and left Oracle session to implicitely convert to date using NLS setting (likely NLS_DATE_FORMAT).
Do yourself a favor - never leave hardcoded value to depend on external setting.
You can use DATE'9999-01-01' instead.