Two records getting inserted with the same timestamp...

Question

          hi all,
          I am trying to submit a form . Now whenever I click submit before I insert any
          data sent in that form I make a check (SELECT stmt. to see if that record can
          be inserted ...few business validations..) and if the check is successful I then
          proceed for the necessary insert into a table the Primary key for which is a running
          Oracle sequence.
          But if I click on the Submit button twice in close succession I have observed
          may be 1 in 1000 attempts I am able to submit two records with the same time stamp
          for the date of insertion . We are using Oracle 8 with weblogic 5.1. And I don't
          think ORACLE's date precision is beyond seconds.
          So any suggestion ..what is the best way to handle such things : one can be
          to place the same business validation check just before the ending brace of the
          method , or secondly sucmit the form thru javascript and don't submit it twice
          even if the user clicks the submit button twice... any suggestion which u can
          give .. are welcome.
          thnx in advance
          sajan
          

Answer 1

Is the pkey a timestamp or an Oracle sequence? The latter will always work,
          since no two requests to a sequence can get the same value (rollover
          excluded). If you must use timestamp, then you must auto-retry the insert
          if the first attempt fails. Oracle does have higher precision than seconds,
          but I can remember the exact precision ... I am pretty sure it works out to
          at least two or three digits though.
          Peace,
          Cameron Purdy
          Tangosol, Inc.
          http://www.tangosol.com
          Tangosol Server: Enabling enterprise application customization
          "Sajan Parihar" <[email protected]> wrote in message
          news:[email protected]...
          >
          > hi all,
          > I am trying to submit a form . Now whenever I click submit before I
          insert any
          > data sent in that form I make a check (SELECT stmt. to see if that record
          can
          > be inserted ...few business validations..) and if the check is successful
          I then
          > proceed for the necessary insert into a table the Primary key for which is
          a running
          > Oracle sequence.
          > But if I click on the Submit button twice in close succession I have
          observed
          > may be 1 in 1000 attempts I am able to submit two records with the same
          time stamp
          > for the date of insertion . We are using Oracle 8 with weblogic 5.1. And I
          don't
          > think ORACLE's date precision is beyond seconds.
          > So any suggestion ..what is the best way to handle such things : one
          can be
          > to place the same business validation check just before the ending brace
          of the
          > method , or secondly sucmit the form thru javascript and don't submit it
          twice
          > even if the user clicks the submit button twice... any suggestion which u
          can
          > give .. are welcome.
          >
          > thnx in advance
          > sajan