When should we use a PreparedStatement instead of a Statement?

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  1. Query is rewritten and compiled by the database server

    If you don’t use a prepared
    statement, the database server will
    have to parse, and compute an
    execution plan for the statement
    each time you run it. If you find
    that you’ll run the same statement
    multiple times (with different
    parameters) then its worth preparing
    the statement once and reusing that
    prepared statement. If you are
    querying the database adhoc then
    there is probably little benefit to
    this.

  2. Protected against SQL injection

    This is an advantage you almost
    always want hence a good reason to
    use a PreparedStatement everytime.
    Its a consequence of having to
    parameterize the query but it does
    make running it a lot safer. The
    only time I can think of that this
    would not be useful is if you were
    allowing adhoc database queries; You
    might simply use the Statement
    object if you were prototyping the
    application and its quicker for you,
    or if the query contains no
    parameters.

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