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With features like Record Structure and subroutines it allows a user to get data from a database and manipulate it by storing it in a temporary structure; execute a particular section of the code, if required using a subroutine. Complete for CCL (Cerner Command Language) is provided by Cerner Corporation.
Just as the 3GL offered greater power to the programmer, so too did the 4GL open up the development environment to a wider population. The early input scheme for the 4GL supported entry of data within the 72-character limit of the punched card (8 bytes used for sequencing) where a card's tag would identify the type or function.
The LIST command is somewhat analogous to the SQL SELECT statement, but incorporates formatting, totaling, and other elements helpful for tailoring output to a business requirement. The SELECT statement, in contrast, is essentially a data query tool: its results would be processed or formatted as required using other mechanisms.
In SQL operations work on a set of records, in the ABL, the operation is applied to a record at a time - much like using a cursor in SQL. Record-based processing provides a clean and reliable locking mechanism which allows the developer to EXECUTIVE-LOCK, SHARE-LOCK or NO-LOCK a record when accessed by the application.
Invented in 1980, Cyberquery is a declarative "4GL" fourth-generation programming language. Its early design was slightly influenced by RAMIS and other data access and analysis languages such as the query language on GE time sharing systems. Cyberquery automates the process of accessing files or tables and reading records or rows.
Informix-4GL is a 4GL programming language developed by Informix during the mid-1980s. [ 1 ] [ 2 ] [ 3 ] At the time of its initial release in 1986, supported platforms included Microsoft Xenix (on IBM PC AT ), DEC Ultrix (running on Microvax II , VAX-11/750 , VAX-11/785 , VAX 8600 ), Altos 2086 , AT&T 3B2 , AT&T 3B5, AT&T 3B20 and AT&T Unix PC .
In the early 1990s, a new PC-based tool for developing LINC specifications was released, the LINC Development Assistant (LDA). LDA was written in a mixture of Smalltalk and C++ rather than the LINC 4GL (the latter of which was not intended to run on a personal computer). From version 17, it was intended that all development be done with LDA.
RAMIS ("Random Access Management Information System") is a fourth-generation programming language (4GL) capable of creating and maintaining databases consisting of named files containing both numeric and alphabetic fields and subsequently producing detailed simple or complex reports using a very simple English like language.