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There are two predominant easy methods to entry IBM's assistance management programs. which you can write software classes that inform IMS what to do, or you can use present application programs that inform IMS what to do. This chapter explains the way to do each of those things.
This chapter is from the booklet
In a huge feel, getting access to IMS potential telling IMS to perform be just right for you.
which you could write utility classes that inform IMS what to do.
which you can use current software classes that tell IMS what to do.
These application classes can run in various environments. They tell IMS what to do by means of calling a few regular IMS features through normal APIs: DL/I and JDBC. 
in this Chapter:
"accessing IMS from application classes"
"accessing IMS from other items" on web page 22
connected analyzing: For assistance about writing IMS software courses, see part IV, "IMS utility building," on page 215.
software courses that at once use the DL/I interface achieve this via issuing DL/I calls. utility classes that use the JDBC interface achieve this via issuing ordinary SQL (structured question language) calls.
gaining access to IMS by using DL/I Calls
DL/I is a typical interface to IMS capabilities that has been in region since IMS's inception. many of the IMS application classes that have been written over the years are still providing the provider for which they had been designed. As company wants have advanced, these application courses have either developed or have become a base for brand spanking new application programs to satisfy the new business needs. in many situations, the application programs that run cutting-edge organizations don't seem to be individual programs, however are a few layers of software programs that work together to put in force the companies' assistance know-how (IT) infrastructure.
as an instance how IMS enterprise application programs have evolved, determine 3-1 on page 19 indicates an easy, hypothetical IMS utility program that accesses a checking account database through DL/I. expect that this software software turned into written two decades in the past, changed into written in COBOL, and become designed to support IBM 3270 (non-programmable) terminals. there are many such software programs that nevertheless run as at first written and supply this kind of assist for the banking industry.
figure 3-1 illustration of an easy application That Accesses an IMS Database via DL/I
determine three-1 illustrates the following processing fashions:
average processing mannequin: The objects on the left aspect of determine 3-1 characterize the natural processing model that includes here add-ons:
- DL/I: The interface to the IMS modules that entry and manipulate the records in IMS databases.
- Checking account application software: This application performs basic operations on checking account balances (reminiscent of queries and updates) and issues DL/I calls that cause IMS to truly question and replace the checking account records that resides within the IMS checking account database.
- Message format carrier (MFS): A provider provided with IMS TM that separates the terminal gadget characteristics from the application application. For greater suggestions, see "Message layout provider" on page 182.
- z/OS communication Server: A communications equipment that is part of the z/OS operating device. In figure three-1, IMS is speaking with the virtual Telecommunications access components (VTAM®) characteristic within the z/OS communication Server. 
- Communications Controller: a tool (hardware and software) that is a component of the telecommunications network.
- 3270-class terminal: earlier than personal computers (PCs) had been invented, these terminals provided access to the mainframe computer&8212;a bank teller could use this type of terminal. In widespread, these forms of terminals were replaced with PCs that run 3270-emulation application classes.
up to date typical processing model: figure three-1 on web page 19 also indicates how right here layers of application courses and protocols have been delivered to the fashioned software software to enable net-primarily based very own banking:
- OTMA: Open Transaction supervisor entry (OTMA) is an open interface to IMS TM. For greater counsel, see "Open Transaction manager entry" on web page 179.
- IMS join: IMS join is an not obligatory IMS TM network component that provides excessive-performance communications for IMS between one or more TCP/IP valued clientele (corresponding to WebSphere utility Server for z/OS) and one or more IMS techniques. For greater information, see "IMS connect" on page 187.
- WebSphere application Server for z/OS: A finished, refined, Java 2 commercial enterprise edition (J2EE) and web services know-how-primarily based software platform mainly designed to leverage the traits of carrier inherent in the z/OS operating gadget. For more advice about how IMS helps WebSphere utility Server for z/OS, see "WebSphere application Server for z/OS functions" on web page 317. - figure three-1 on page 19 includes the IMS resource Adapter, which is delivered with the IMS connect feature and IBM WebSphere Studio application Developer Integration edition.
- enterprise JavaBean: A person-written, object-oriented, disbursed, commercial enterprise-stage software.
- net Browser: a consumer software that initiates requests to a web server and displays the suggestions that the server returns. The web browser is the exact conclusion-consumer interface with which financial institution clients can manipulate their checking accounts.
having access to IMS the use of JDBC
The IMS Java characteristic provides IMS's implementation of the JDBC API. software programs that use the JDBC interface to access IMS difficulty SQL calls and could run on a non-z/OS platform.
The IMS Java feature allows you to write Java utility courses that access IMS databases and IMS message queues from numerous places:
Any ambiance that helps the JDBC API
IBM WebSphere utility Server for z/OS
WebSphere application Server working on a non-z/OS platform
IBM customer tips handle system (CICS) Transaction Server for z/OS
IBM DB2 regular Database for z/OS saved procedures
For more assistance about writing Java functions for IMS, see Chapter 18, "application Programming in Java" on web page 311.
determine 3-2 illustrates an business JavaBean (EJB) that can function work on the IMS checking account database. note that in figure three-2, IMS does not require an utility software to situation DL/I calls.
figure 3-2 example of an EJB That Accesses an IMS Database during the JDBC Interface
figure 3-2 comprises here components:
DRA: The database resource adapter (DRA) is the bridge between ODBA and IMS.
ODBA: Open Database entry (ODBA) is the IMS callable interface for access to IMS DB.
IMS JDBC resource adapter: The IMS JDBC resource adapter that's deployed on the z/OS platform. The IMS JDBC resource adapter is delivered with the IMS Java feature.
IMS Java EJB: one in every of two IMS Java-offered EJBs is the host-facet part that helps communication with and passes transaction counsel to the IMS JDBC useful resource adapter. These EJBs act as listeners for far off requests.
WebSphere application Server for z/OS.
IIOP: information superhighway Inter-ORB Protocol (IIOP) is the protocol that may also be used between WebSphere software Server for z/OS and WebSphere application Server operating on one other platform. IIOP allows the servers to alternate facts. data is securely transferred across the information superhighway using the SSL (cozy Sockets Layer) protocol.
IMS distributed JDBC useful resource adapter: The useful resource adapter that's deployed on the non-z/OS platform, which carries a sort-three JDBC driver and is delivered with the IMS Java characteristic.
EJB: The EJB business application that carries your company common sense and is deployed on WebSphere software Server.
WebSphere application Server: WebSphere utility Server on which the client software runs.
non-z/OS platform: The working system that hosts WebSphere software Server.
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