SQLRPGLE PDF

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Overview[ edit ] An RPG program once typically started off with File Specifications, listing all files being written to, read from or updated, followed by Data Definition Specifications containing program elements such as Data Structures and dimensional arrays, much like a "Working-Storage" section of a COBOL program. This is followed by Calculation Specifications, which contain the executable instructions. Output Specifications can follow which can be used to determine the layout of other files or reports.

In the early days of RPG, its major strength was known as the program cycle: every RPG program executes within an implied loop , which can apply the program to every record of a file.

The concept of level breaks and matching records is unique to the RPG II language, and was originally developed with card readers in mind. History[ edit ] RPG is one of the few languages created for punched card machines which are still in common use today, because it has evolved considerably over time.

It was originally developed by IBM in The name Report Program Generator was descriptive of the purpose of the language: generation of reports from data files, including matching record and sub-total reports. Both languages were intended to facilitate ease of transition for IBM tabulating machine Tab unit record equipment technicians to the then-new computers.

Tab machine technicians were accustomed to plugging wires into control panels to implement input, output, control and counter operations add, subtract, multiply, divide.

Tab machines programs were executed by impulses emitted in a machine cycle; hence, FARGO and RPG emulated the notion of the machine cycle with the program cycle. Until November , the free format applied exclusively to the calculation specifications. While editing can still be done via SEU, the simple green screen editor even though syntax checking is not supported for features introduced from IBM i V7R1 onward , a long progression of tools has been developed over time.

Eclipse, and therefore RDi, runs primarily on personal computers and other devices. Even with the changes, it retains a great deal of backward compatibility, so an RPG program written 37 years ago could run today with little or no modification. With the traditional F-Spec approach a developer had to identify a specific access path to a data set, now they can implement standard embedded SQL statements directly in the program. The new Power Systems also adopt more mainstream version numbers, substituting 6.

The latest release is now referred to as IBM i 7. The threadsafe aspects of the language are considered idiosyncratic by some as the compiler team has addressed threads by giving each thread its own static storage, rather than make the RPG run-time environment re-entrant.

This has been noted to muddle the distinction between a thread and a process making RPG IV threads a kind of hybrid between threads and processes. Please help improve it by removing promotional content and inappropriate external links , and by adding encyclopedic content written from a neutral point of view. The idea behind the new capability is to remove the necessity for all output from RPG programs to be forced into the limited data stream.

Instead, it can be passed to handlers, which can transform it in any way the handler wants. Note: The character in the data type column is the character that is encoded on the Definition Specification in the column designated for data type. To compare, in a language like C where definitions of variables are free-format and would use a keyword such as int to declare an integer variable, in RPG, a variable is defined with a fixed-format Definition Specification.

In the Definition Specification, denoted by a letter D in column 6 of a source line, the data type character would be encoded in column Also, if the data type character is omitted, that is, left blank, the default is A if no decimal positions are specified, P when decimal positions are specified for stand-along fields, and S ZONED when decimal positions are specified within a data structure. Data type.

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Example: SQL statements in RPG/400 programs

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Performances. Accès aux données en RPGLE natif ou en SQLRPGLE

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