By Bulusu Lakshman
Oracle Developer kinds options describes the strategies and methods had to construct Web-enabled functions with varieties. The ebook covers complicated issues in nice aspect, together with realizing and overcoming blunders dealing with boundaries in kinds, corresponding to error which can't be tracked via general FORM_SUCCESS or FORM_FAILURE, ordering through goods according to FK look-ups, acquiring question count number with no really executing a question, and appearing an specific server-side dedicate from kinds. The ebook additionally covers object-oriented equipment in varieties, and Intelligence in kinds. Code segments are supplied to assist builders enforce those ideas, therefore easing software improvement effort and time.
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Extra info for Oracle Developer Forms Techniques
Note that the technique described here works only for exact equality matches and without involving any other operators, such as >, <, and so on. For example, if the user enters > 1000 in the EMPNO item, an error occurs. Additional functionality for nonequality and LIKE matches should be coded explicitly in the Query procedure.
The WHERE condition has to be specified properly and should be contained as part of the INLINE query instead of the DEFAULT_WHERE for the block, especially when selecting mutually non-related column sets and joining on non foreign key columns. 5, also) rather than specifying EMP as the base table with DNAME as a foreign key look-up column. ) Here is an additional tip that will help as you work with base tables based on a FROM clause query: • A FROM clause query specified as a base table for a data block is executed as an inline view and facilitates faster execution.
Performing an Enter Query in the EMPLOYEE block and specifying a criteria like S% in the DEPT_NAME item followed by Execute Query would retrieve only those employees belonging to departments whose names start with uppercase S. Tip PRE-QUERY is fired even before the SELECT is constructed and is the best place to dynamically change the DEFAULT_WHERE and ORDER BY clauses. PRE-SELECT is fired after the SELECT is constructed and before it is issued for execution. LAST_QUERY holds this SELECT at this point in time.