- Free As400 Tutorial For Beginners Pdf Files Free
- As400 Tutorial Pdf
- Free As400 Tutorial For Beginners Pdf Files Pdf
- As400 Tutorial For Beginners Pdf
- Free As400 Training For Beginners
How to start with AS400 development? It is the most asked question by any newbie who doesn’t know what is programming or what is AS400. Don’t worry, it is so easy with lots of documentation available from IBM for each and every commands. But before going there, we need to do something to have our own environment for development or research. The below pointers will help you to start with AS400 development.
Free As400 Tutorial For Beginners Pdf Files Free
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First, we need to create our own library, Source PFs to start programming by creating members.
This is just a beginning for AS400 development. You can go through all basic topics under AS400 Basics category to get more understanding and can start your journey in AS400. Parallels desktop for mac app store edition.
Before going further, get your free IBM latest version of the server for Development, testing, etc.Below link will help you on the same.
How to Get Free Remote Access to IBM Power Systems for Development?
After getting the free IBM server, then it’s up to you to use it effectively. Below sections will help you to organize your AS400 tasks.
First command to issue
- Login with your registered credentials.
- You can issue the command, STRPDM in the IBM i Series command line. Below options will be listed,
- Work with libraries (WRKLIBPDM to access this directly)
- This provides all the library present in the system.
- You can get the list of objects/members present in that specific library.
- Work with objects (WRKOBJPDM to access this directly)
- This will list you all the objects in a specific library.
- Work with members (WRKMBRPDM to access this directly)
- This will list you all the members of a specific library.
- You will spend most of your time with the members and this will be your default command once you log in to your system.
- This will list you all the members of a specific library.
- Work with libraries (WRKLIBPDM to access this directly)
If any IBM command is not working in command line, then take F4 on the same and issue correct expected parameters.
AS400 Libraries
- Libraries provide a method for organizing objects.
- All libraries that we create are stored in QSYS library.
- We cannot create a library within a library. The only exception is IBM supplied QSYS which holds all the other libraries in it.
- Members/Objects are not stored in a library. They are just arranged under a library so that they can be easily referred.
- That is, while creating any member or object, it will be created with the library name. Just relate this to an index. So, if we access a library, we can see all the objects/members present under it.
- A library is similar to a directory or a folder in the conventional file system like WINDOWS.
- Some commonly used system supplied libraries are QGPL, QTEMP.
- Use CRTLIB command to create your library.
- CRTLIB LIB($SAKTHI) TYPE(*TEST) TEXT(‘Sakthi”s test library’)
- Here, TYPE can be
- *PROD – You will have restricted authority over these objects. Like, file updating while debugging, etc.
- *TEST – You will have most of the authority over the objects in it.
- Here, TYPE can be
So, personal libraries, you can create with TYPE as *TEST.
Library list
- A library list is an ordered list of libraries with associated objects.
- These libraries are searched one by one until an object is found with the specified object name and type (If the object name is qualified by preceding it with a library, the system searches for the object only in that specified library).
- Library list is consists of,
- System Libraries,
- Product Libraries,
- Current Library (If you have given any current library explicitly. Else, it will be QGPL and will not be listed in the usual library list),
- User Libraries.
- For example, consider the below library list,
Here,
- If you are trying to access an object (DBU FILE(ORDHDR)) which is present under DEVDTA library, then the system will first check the current library SAKTHI. If it is not present there, then it will check in the next library in the list. Then it will search in DEVDTA and will access it.
- If you are prefixing the library while trying to access the object under DEVDTA (DBU FILE(SAKTHI/ORDHDR)), then the system directly looks into that library and access the mentioned object.
- If you prefix the library list to the object you are trying to access, then irrespective of the libraries presence in the library list, you will still able to access it.
Source physical file
- After creating a library, we need to create source physical file to store the source code required to create objects like RPGLE, CL program, DDS file, etc.
- That is, under source PFs, we will be creating members and each member will be having the actual code for creating any objects or programs/files, etc.
- There can be any number of members under a source PF if we have specified Maximum members (MAXMBRS), the default valuewhile creating it.
- It is better to create a source PFs for each type (like CL, DDS, RPGLE, etc) so that it will be easy to organize or search the source.
- Use CRTSRCPF to create your source PF
- CRTSRCPF FILE($SAKTHI/QRPGLESRC) RCDLEN(112) TEXT(‘sakthi”s test source’)
- Default RCDLEN will be 92. If you create a source PF with this default length and try to copy a source from a Source PF of 112 RCDLEN, then the comments will be truncated to 92 lengths. So, it is better to create it with 112 RCDLEN itself.
Members
- Take F6 in your library/source PF to create a member of any type.
- You will be manipulating this member to create an object of your need.
- The member name is unique under a Source PF. If you try to create another member in the same name, then the previous source will be opened in the editor.
- If you are trying to create the same member with another source type, then the existing source type will be converted to the new one.
- You can have same member name under a library with different Source PFs.
- This is how the members will be stored,
- $SAKTHI/QRPGLESRC CHKHOLIDY. Where $SAKTHI is the library, QRPGLESRC is the Source PF and CHKHOLIDY is the member.
- So, you can have a member like this also, $SAKTHI/QCLLESRC CHKHOLIDY.
- But the object names should be unique under the library for each type.
- That is, for the type *PGM, there can be only one CHKHOLIDY object.
- If you are trying to create a CL and RPG in the same name under the same library, then only one will exist.
- The recent one will replace the older object. But for the type *FILE, you can create an object in the same name. That can coexist.
- But the object names should be unique under the library for each type.
- This is how the members will be stored,
Useful points
- All system libraries will start with “Q” or “#”
- While creating our personal library, it is better to start with any character other than “Q” or “#” to avoid confusion.
- We can give some meaningful name for everything.
- For example,
- LIBPROD for production library, LIBQA for QA library, LIBDEV for development library, $SAKTHI for a personal library.
- QRPGLESRC for RPGLE Source PF, QCLLESRC for CL Source PF, QDDSSRC for DDS Source PF, etc.
- For member names also, you can follow the similar naming convention that should give you a hint of what is inside. That is, ‘ChkHolidy’ for a program to check if the date passed lies on a holiday.
- For example,
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Free As400 Tutorial For Beginners Pdf Files Pdf
COBOL stands for Common Business Oriented Language.The US Department of Defense, in a conference, formed CODASYL (Conference on Data Systems Language) to develop a language for business data processing needs which is now known as COBOL.
As400 Tutorial For Beginners Pdf
COBOL is used for writing application programs and we cannot use it to write system software. The applications like those in defense domain, insurance domain, etc. which require huge data processing make extensive use of COBOL.
This tutorial is designed for software programmers who would like to learn the basics of COBOL. It provides enough understanding on COBOL programming language from where you can take yourself to a higher level of expertise.
Free As400 Training For Beginners
Before proceeding with this tutorial, you should have a basic understanding of computer programming terminologies and JCL. A basic understanding of any of the programming languages will help you understand the concepts of COBOL programming and move fast on the learning track.