/**************************************************************************** ** (c) Copyright IBM Corp. 2007 All rights reserved. ** ** The following sample of source code ("Sample") is owned by International ** Business Machines Corporation or one of its subsidiaries ("IBM") and is ** copyrighted and licensed, not sold. You may use, copy, modify, and ** distribute the Sample in any form without payment to IBM, for the purpose of ** assisting you in the development of your applications. ** ** The Sample code is provided to you on an "AS IS" basis, without warranty of ** any kind. IBM HEREBY EXPRESSLY DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR ** IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF ** MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Some jurisdictions do ** not allow for the exclusion or limitation of implied warranties, so the above ** limitations or exclusions may not apply to you. IBM shall not be liable for ** any damages you suffer as a result of using, copying, modifying or ** distributing the Sample, even if IBM has been advised of the possibility of ** such damages. ***************************************************************************** ** ** SOURCE FILE NAME: loop.sqc ** ** SAMPLE: To call the LOOP_UNTIL_SPACE SQL procedure ** ** There are two parts to this program: ** 1. the loop executable (placed on the client) ** 2. the LOOP_UNTIL_SPACE SQL procedure (created on the ** server with the loop.db2 CLP script) ** ** loop calls the LOOP_UNTIL_SPACE SQL procedure by preparing ** and executing a dynamic CALL statement: ** ** sprintf(stmt, "CALL %s (?)", procname); ** EXEC SQL prepare st from :stmt; ** EXEC SQL execute st INTO :count:countind; ** ** When the CALL with Host Variable is used, ** the precompiler allocates and initializes an internal one ** variable SQLDA for both input and output. ** ** The LOOP_UNTIL_SPACE procedure counts the number of FETCH ** operations performed in a LOOP statement until the cursor ** retrieves a row with a space (' ') value for column "midinit". ** The loop statement causes the flow of control to exit ** the loop and complete the stored procedure. ** ** The counter value is assigned to the counter OUT parameter ** that is returned to the loop client. The loop client ** then prints the counter value. ** ** SQL STATEMENTS USED: ** CONNECT ** CALL ** ** ***************************************************************************** ** ** For more information on the sample programs, see the README file. ** ** For information on creating SQL procedures and developing C applications, ** see the Developing SQL and External Routines book. ** ** For information on using SQL statements, see the SQL Reference. ** ** For the latest information on programming, building, and running DB2 ** applications, visit the DB2 Information Center: ** http://publib.boulder.ibm.com/infocenter/db2luw/v9r7/index.jsp ****************************************************************************/ #include <stdio.h> #include <stdlib.h> #include <sql.h> #include <sqlda.h> #include <sqlca.h> #include <string.h> #include "utilemb.h" int main(int argc, char *argv[]) { EXEC SQL BEGIN DECLARE SECTION; char database[9]; char userid[9]; char passwd[19]; /* Declare a Local Variable for Holding the Procedure's Name */ char procname[254] = "LOOP_UNTIL_SPACE"; /* Declare a statement string to call the procedure dynamically */ char stmt[1200]; /* Declare Local Variables for Passing Data to SQL Procedure */ sqlint32 count = 0; sqlint16 countind = 0; EXEC SQL END DECLARE SECTION; /* Declare the output SQLDA */ struct sqlda *inout_sqlda = (struct sqlda *) malloc(SQLDASIZE(1)); /* Declare the SQLCA */ struct sqlca sqlca; char eBuffer[1024]; /* error message buffer */ if (argc != 4) { printf ("\nUSAGE: loop remote_database userid passwd\n\n"); return 1; } strcpy (database, argv[1]); strcpy (userid, argv[2]); strcpy (passwd, argv[3]); /* Connect to Remote Database */ printf("CONNECT TO Remote Database.\n"); EXEC SQL CONNECT TO :database USER :userid USING :passwd; EMB_SQL_CHECK("CONNECT TO RSAMPLE"); /********************************************************\ * Call the Remote Procedure via CALL with Host Variables * \********************************************************/ printf("Use CALL with Host Variables to invoke the Server Procedure " "named %s\n", procname); countind = -1; /* count has no input, so set to null */ sprintf(stmt, "CALL %s (?)", procname); EXEC SQL prepare st from :stmt; EMB_SQL_CHECK("PREPATE CALL STATEMENT"); EXEC SQL execute st INTO :count:countind; EMB_SQL_CHECK("EXECUTE CALL STATEMENT"); /********************************************************\ * Display the # of times the LOOP statement iterated * \********************************************************/ printf("\nLOOP statement iterated %d times before column midinit = \' \'\n", count); /* COMMIT or ROLLBACK the transaction */ if (SQLCODE == 0) { /* Rollback the changes to the database */ EXEC SQL ROLLBACK; printf("Server Procedure Complete.\n"); } else { /* print the error message, roll back the transaction and return */ sqlaintp (eBuffer, 1024, 80, &sqlca); printf("\n%s\n", eBuffer); EXEC SQL ROLLBACK; printf("Server Procedure Transaction Rolled Back.\n\n"); return 1; } /* Free allocated memory */ free( inout_sqlda ); /* Disconnect from Remote Database */ EXEC SQL CONNECT RESET; EMB_SQL_CHECK("CONNECT RESET"); return 0; } /* end of program : loop.sqc */