By John Sadd
This publication is a accomplished travel of the entire crucial parts of the development 4GL. The growth 4GL continues to be by means of some distance the main robust and complete language for constructing severe enterprise functions. mixed with the growth RDBMS(tm) database and the opposite parts of the development OpenEdge(tm) product relations, the development 4GL can help you in construction and deploying your functions in ways in which are matched through no different setting at the present time. by the point you entire this e-book, you'll be powerfuble to construct completely sleek functions that make the most of many of the language's gains. and you'll use the language to construct strong company program good judgment, not only the toy demonstration home windows you discover in different language tutorials. development is no longer a toy. it is a device for severe builders who've severe enterprise difficulties to unravel. This e-book is written for 2 other forms of audiences. the 1st team contains current development builders who may need created functions in past releases of the product, whilst a number of the extra fresh extensions to the language weren't but on hand. while you're already skilled within the 4GL, you will discover many of the fabric, in particular within the first couple of chapters, customary. be at liberty to skim via these sections quick, yet you shouldn't bypass even the 1st chapters altogether to prevent lacking anything-there are alterations and improvements to the language at each point. the second one viewers for this publication contains humans thoroughly new to growth. For these of you during this moment team, you'll want to take the time to benefit adequate in regards to the language to appreciate many of the many methods it could assist you on your improvement paintings. you most likely have to have a historical past in another programming language to trap directly to growth speedy, as the fabric may well come at you quickly and livid. regardless of its many remarkable and exact positive factors, the development 4GL is essentially a procedural programming language with lots of the related constructs universal to just about all such languages.
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Extra resources for OpenEdge Development: Progress 4GL Handbook
2–16 Defining an IF-THEN-ELSE decision point Using built-In 4GL functions To complete this latest change to the procedure, you need to define the statement that checks whether the ShipDate is Unknown, and then picks out the month from the date, using the cMonthList variable you defined just above, and converts it to one of the three-letter abbreviations in the list. Here is the whole statement: IF ShipDate NE ? THEN DISPLAY ENTRY(MONTH(ShipDate), cMonthList) LABEL "Month". Now take a closer look at the elements in the DISPLAY statement.
2–11 Using Basic 4GL Constructs Table 2–3: Common format symbols This format character . . (2 of 2) Represents . . + A sign for a positive or negative number. It is displayed as + for a positive number, and as – for a negative number. – A sign for a negative number. It is displayed as a – for a negative number. For a positive number it is suppressed if it is to the left of the decimal point in the format, and replaced by a blank if it is to the right of the decimal point. You can insert other characters as you wish into formats, and they are displayed as literal values.
The procedure itself is the main block of the procedure. There are a number of ways to define other blocks within the main procedure block. The FOR EACH statement and its matching END statement are one example of a nested block, in this case one that iterates through a set of database records and executes all the code in between for each record in the set. There are other block statements you can use for different purposes. Some of them are also iterating, and cause the block to be executed multiple times.