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/*
* Program type: Embedded Dynamic SQL
*
* Description:
* This program adds several departments with small default
* budgets, using 'execute immediate' statement.
* Then, a prepared statement, which doubles budgets for
* departments with low budgets, is executed.
* The contents of this file are subject to the Interbase Public
* License Version 1.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy
* of the License at http://www.Inprise.com/IPL.html
*
* Software distributed under the License is distributed on an
* "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express
* or implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code was created by Inprise Corporation
* and its predecessors. Portions created by Inprise Corporation are
* Copyright (C) Inprise Corporation.
*
* All Rights Reserved.
* Contributor(s): ______________________________________.
*/
#include "example.h"
#include <stdlib.h>
#include <string.h>
#define MAXLEN 256
int get_line (char *line);
void clean_up (void);
static char *Dept_data[] =
{
"117", "Field Office: Hong Kong", "110",
"118", "Field Office: Australia", "110",
"119", "Field Office: New Zealand", "110",
0
};
int Dept_ptr = 0;
char Db_name[128];
EXEC SQL
SET DATABASE empdb = "employee.fdb" RUNTIME :Db_name;
int main(int argc, char** argv)
{
BASED_ON department.department dept_name;
BASED_ON department.dept_no dept_id;
char exec_str[MAXLEN], prep_str[MAXLEN];
if (argc > 1)
strcpy(Db_name, argv[1]);
else
strcpy(Db_name, "employee.fdb");
EXEC SQL
WHENEVER SQLERROR GO TO MainError;
EXEC SQL
CONNECT empdb;
clean_up();
EXEC SQL
SET TRANSACTION;
/*
* Prepare a statement, which may be executed more than once.
*/
strcpy(prep_str,
"UPDATE DEPARTMENT SET budget = budget * 2 WHERE budget < 100000");
EXEC SQL
PREPARE double_small_budget FROM :prep_str;
/*
* Add new departments, using 'execute immediate'.
* Build each 'insert' statement, using the supplied parameters.
* Since these statements will not be needed after they are executed,
* use 'execute immediate'.
*/
while (get_line(exec_str))
{
printf("\nExecuting statement:\n\t%s;\n", exec_str);
EXEC SQL
EXECUTE IMMEDIATE :exec_str;
}
EXEC SQL
COMMIT RETAIN;
/*
* Execute a previously prepared statement.
*/
printf("\nExecuting a prepared statement:\n\t%s;\n\n", prep_str);
EXEC SQL
EXECUTE double_small_budget;
EXEC SQL
COMMIT;
EXEC SQL
DISCONNECT empdb;
exit(0);
MainError:
EXEC SQL
WHENEVER SQLERROR CONTINUE;
isc_print_status(gds__status);
printf("SQLCODE=%d\n", SQLCODE);
EXEC SQL ROLLBACK;
exit(1);
}
/*
* Construct an 'insert' statement from the supplied parameters.
*/
int get_line(char* line)
{
if (Dept_data[Dept_ptr] == 0)
return 0;
if (Dept_data[Dept_ptr + 1] == 0)
return 0;
if (Dept_data[Dept_ptr + 2] == 0)
return 0;
sprintf(line, "INSERT INTO DEPARTMENT (dept_no, department, head_dept) \
VALUES ('%s', '%s', '%s')", Dept_data[Dept_ptr],
Dept_data[Dept_ptr + 1], Dept_data[Dept_ptr + 2]);
Dept_ptr += 3;
return(1);
}
/*
* Delete old data.
*/
void clean_up (void)
{
EXEC SQL WHENEVER SQLERROR GO TO CleanErr;
EXEC SQL SET TRANSACTION;
EXEC SQL EXECUTE IMMEDIATE
"DELETE FROM department WHERE dept_no IN ('117', '118', '119')";
EXEC SQL COMMIT;
return;
CleanErr:
isc_print_status(gds__status);
printf("SQLCODE=%d\n", SQLCODE);
exit(1);
}
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