describes IDS v11 features for stored procedures and triggers.

1. Advance features in stored procedures and triggers. Keshava Murthy, Architect, Informix Software Session Number TIX-2258

3. Trigger Enhancements employee_tab Insert trigger Delete trigger Select triggers employee_tab Pre 11 server 11 server Single insert and delete triggers, and multiple update and select triggers on mutually exclusive columns Multiple insert, update, delete and select triggers without exclusivity rule. The multiple insert and delete triggers feature is new in Cheetah. Update triggers Insert triggers Delete triggers Update triggers Select triggers New Feature: Multiple Triggers New feature: No Exclusivity rule

12. New Functions and Expressions ASCII(character_expression) The ASCII function returns the decimal representation of the first character in a character string. ASCII(‘a’) returns: 97 ASCII(‘Hello World!’) returns: 72 ASCII ADD_MONTHS(date/datetime expression , integer ) Adds months to a date or datetime value or expression. The first argument is date or datetime expression and second is an integer. Return type is same as first argument. ADD_MONTHS('4/16/2004', 20) returns: 12/16/2005 ADD_MONTHS(CURRENT, 3) returns: 2007-09-19 10:04:11.00000 ADD_MONTHS()

13. New Functions and Expressions CEIL (numerical_expession) returns the DECIMAL(32) representation of the smallest integer that is greater than or equal to its single argument. FLOOR(numerical_expression) returns the DECIMAL(32) representation of the largest integer that is smaller than or equal to its single argument. CEIL(-54.232) returns -54 FLOOR(-54.232) returns -55 CEIL(54.232) returns 55 FLOOR(54.232) returns 54 CEIL FLOOR BITAND(num1, num2) – returns the bitwise ANDed value. BITOR(num1, num2) – returns the bitwise ORed value. BITXOR(num1, num2) – returns the bitwise XORed value. BITNOT(num1) – returns the bitwise ANDed value. BITANDNOT(num1, num2) – is a short form for BITAND(arg1, BITNOT(arg2)) Bitwise functions

14. New Functions and Expressions LAST_DAY(date or datetime expression) Returns last day of the month in the argument. SELECT TODAY AS today, CURRENT AS current, LAST_DAY(TODAY) AS last_from_today, LAST_DAY(CURRENT) AS last_from_current FROM systables WHERE tabid = 1; today 06/19/2007 current 2007-06-19 10:23:01.000 last_from_today 06/30/2007 last_from_current 2007-06-30 10:23:01.00000 LAST_DAY FORMAT_UNITS(number, precision, units) Helps formatting of numbers in kilobytes to peta bytes. Detailed explanation with examples is in IDS SQL Syntax guide. SELECT FORMAT_UNITS( SUM(chksize), 'P') size, FORMAT_UNITS( SUM(nfree), 'p') free FROM syschunks; size 117 MB free 8.05 MB FORMAT_UNITS

15. New Functions and Expressions MONTHS_BETWEEN(date/datetime expr, date/datetime expr) Returns the difference between two date or datetime expressions in decimal, based on 31day months. SELECT CURRENT, MONTHS_BETWEEN(TODAY, LAST_DAY(CURRENT)) FROM systables WHERE tabid = 1; (expression) (expression) 2007-06-19 10:51:57.000 -0.3694433243728 MONTHS_BETWEEN LTRIM(source_string, pad_string) Returns the source_string after removing specified leading pad characters from a string. LTRIM will remove leading blanks when you simply pass the source string. LTRIM(‘Hello Cheetah!’, ‘Hello ‘) returns: Cheetah! LTRIM

16. New Functions and Expressions TO_NUMBER(character or numeric expression) converts a number or a character expression representing a number value to a DECIMAL. TO_NUMBER NULLIF(arg1, arg2) Returns NULL if arg1 and arg2 are equal, else returns arg1. If both are NULL – they won’t be equal – but still returns NULL because arg1 is NULL. NULLIF Next_day(date or datetime expr, abbreviated day of the week) Returns the date or datetime for next day matching the second argument. EXECUTE FUNCTION NEXT_DAY(TODAY, 'Mon') returns: 06/25/2007 EXECUTE FUNCTION NEXT_DAY(CURRENT, 'Mon') returns: 2007-06-25 6:57:52.00000 NEXT_DAY

17. Enhancements to Functions Works same as POW() function. POWER Returns the same value as CURRENT DATETIME year to fraction(5) SYSDATE These two functions can now take date and datetime expressions. IDS Syntax guide explains this in detail. TRUNC ROUND TO_CHAR(numeric expression) In addition to exisiting functionality, in IDS v11.10, this function will convert a number into a charater string. TO_CHAR

20. Named Parameters Support for JDBC Here is the same code rewritten using named parameter notation: // Set parameters (named notation) cstmt.setInt(" cust_id ", 5739 ); Chapter 9. SQL Language 275 cstmt.setInt(" item_id ", 8294); cstmt.setString(" shipping_addr ", "345, University ave."); cstmt.setInt(" shipping_zip ", 94303); cstmt.setString(" billing_addr ","4100 Bohannon Dr."); cstmt.setInt(" billing_zip ", 94025); cstmt.setInt(" count ", 5); // Execute cstmt.execute();

26. Stored Procedure language(SPL) routines IDS Client IDS Client Informix routine manager Informix Dynamic Server Query processing and Optimizer C Language routines Java language routines

32. SQL Injection http://xkcd.com/327/ http://imgs.xkcd.com/comics/exploits_of_a_mom.png This work is licensed under a Creative Commons Attribution- NonCommercial 2.5 License . This means you're free to copy and share these comics (but not to sell them).