When a client sends a cursor request, a typical mainframe server application performs the tasks in Table 1-4.
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 type of request. Determine the type of client request: RPC, language, dynamic, or cursor. |
TDINFPGM |
4. Determine the type of cursor request. Retrieve CURSOR-COMMAND, CURSOR-ID, and COMMAND-OPTIONS. |
TDCURPRO |
5. Process the cursor request. Get the SQL statement, number of parameters, table name, and parameters format. Either receive input parameters or update columns. |
TDRCVSQL TDNUMPRM TDINFPRM TDRCVPRM |
6. Describe the rows. Describe the rows. Send rows. |
TDESCRIB TDSNDROW |
7. Send return information. Send acknowledgment, CURSOR-STATUS, CURSOR-INFO. |
TDCURPRO |
8. Send DONE. Send a DONE package. |
TDSNDDON |
9. Accept the next request. Accept the incoming request. |
TDGETREQ |
10. End the conversation. Send final DONE package. Free the TDPROC structure. Free the MVS storage. |
TDSNDDON TDFREE TDTERM |
