When a client sends a dynamic request, a typical mainframe server application performs the tasks in Table 1-5.
Task |
Function |
|---|---|
1. Prepare for incoming requests. Initialize the Gateway-Library environment. Specify the type of IMS TM transaction (used with IMS TM transactions only). |
TDINIT TDSETPT |
2. Accept the incoming request. Accept the incoming request. |
TDACCEPT |
3. Determine the event type. Determine the type of client request: RPC, language, dynamic, or cursor. |
TDINFRPC |
4. Determine the type of dynamic operation. This can be a dynamic prepare request, dynamic execute request, dynamic execute immediate request, request for input or output parameter descriptions, or deallocate request. |
TDYNAMIC |
5. Process dynamic operation. Get the statement (for prepare). Get the statement ID (for all dynamic requests). |
TDYNAMIC |
6. Handle the incoming parameters. Determine number of parameters (for execute). Retrieve number of parameters (for execute). Retrieve input parameters (for execute). |
TDNUMPRM TDINFPRM TDRCVPRM |
7. Describe the data. Describe input/output parameters, or rows to be returned. |
TDSNDROW |
8. Return data to the client. Send result rows for execute or execute immediate. Send an acknowledge request. Send a done package. |
TDYNAMIC TDSNDDON |
9. Get the next request type. Accept the incoming request. |
TDGETREQ |
10. End the conversation. Send final DONE package. Free the TDPROC structure. Free the MVS storage. |
TDSNDDON TDFREE TDTERM |
