/****************************************************************************
** (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: dbuse.sqc
**
** SAMPLE: How to use a database
**
** SQL STATEMENTS USED:
** CREATE TABLE
** DROP TABLE
** DELETE
** PREPARE
** EXECUTE
** EXECUTE IMMEDIATE
** COMPOUND SQL (EMBEDDED)
**
**
*****************************************************************************
**
** For more information on the sample programs, see the README file.
**
** For information on developing embedded SQL applications see the Developing Embedded SQL Applications 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 <string.h>
#include <sqlenv.h>
#include <sqlutil.h>
#include "utilemb.h"
int StaticStmtInvoke(void);
int StaticStmtWithHostVarsInvoke(void);
int DynamicStmtEXECUTE_IMMEDIATE(void);
int DynamicStmtEXECUTE(void);
int DynamicStmtWithMarkersEXECUTEusingHostVars(void);
int DynamicStmtWithMarkersEXECUTEusingSQLDA(void);
int CompoundStmtInvoke(void);
int main(int argc, char *argv[])
{
int rc = 0;
char dbAlias[SQL_ALIAS_SZ + 1];
char user[USERID_SZ + 1];
char pswd[PSWD_SZ + 1];
/* check the command line arguments */
rc = CmdLineArgsCheck1(argc, argv, dbAlias, user, pswd);
if (rc != 0)
{
return rc;
}
printf("\nTHIS SAMPLE SHOWS HOW TO USE A DATABASE.\n");
/* connect to the database */
rc = DbConn(dbAlias, user, pswd);
if (rc != 0)
{
return rc;
}
rc = StaticStmtInvoke();
rc = StaticStmtWithHostVarsInvoke();
rc = DynamicStmtEXECUTE_IMMEDIATE();
rc = DynamicStmtEXECUTE();
rc = DynamicStmtWithMarkersEXECUTEusingHostVars();
rc = DynamicStmtWithMarkersEXECUTEusingSQLDA();
rc = CompoundStmtInvoke();
/* disconnect from the database */
rc = DbDisconn(dbAlias);
if (rc != 0)
{
return rc;
}
return 0;
} /* end main */
int StaticStmtInvoke(void)
{
struct sqlca sqlca;
printf("\n-----------------------------------------------------------");
printf("\nUSE THE SQL STATEMENTS:\n");
printf(" CREATE TABLE\n");
printf(" DROP TABLE\n");
printf("TO SHOW HOW TO USE STATIC SQL STATEMENTS.\n");
/* create a table */
printf("\n Execute the statement\n");
printf(" CREATE TABLE table1(col1 INTEGER)\n");
EXEC SQL CREATE TABLE table1(col1 INTEGER);
EMB_SQL_CHECK("CREATE TABLE -- Invoke");
/* commit the transaction */
printf(" Execute COMMIT.\n");
EXEC SQL COMMIT;
EMB_SQL_CHECK("CREATE TABLE -- Commit");
/* drop a table */
printf("\n Execute the statement\n");
printf(" DROP TABLE table1\n");
EXEC SQL DROP TABLE table1;
EMB_SQL_CHECK("DROP TABLE -- Invoke");
/* commit the transaction */
printf(" Execute COMMIT.\n");
EXEC SQL COMMIT;
EMB_SQL_CHECK("DROP TABLE -- Commit");
return 0;
} /* StaticStmtInvoke */
int StaticStmtWithHostVarsInvoke(void)
{
struct sqlca sqlca;
EXEC SQL BEGIN DECLARE SECTION;
short hostVar1;
char hostVar2[20];
EXEC SQL END DECLARE SECTION;
printf("\n-----------------------------------------------------------");
printf("\nUSE THE SQL STATEMENTS:\n");
printf(" DELETE\n");
printf(" ROLLBACK\n");
printf("TO SHOW HOW TO USE HOST VARIABLES.\n");
/* execute a statement with host variables */
printf("\n Execute\n");
printf(" DELETE FROM org\n");
printf(" WHERE deptnumb = :hostVar1 AND\n");
printf(" division = :hostVar2\n");
printf(" for\n");
printf(" hostVar1 = 15\n");
printf(" hostVar2 = 'Eastern'\n");
hostVar1 = 15;
strcpy(hostVar2, "Eastern");
EXEC SQL DELETE FROM org
WHERE deptnumb = :hostVar1 AND
division = :hostVar2;
EMB_SQL_CHECK("Delete with host variables -- Execute");
/* rollback the transaction */
printf("\n Rollback the transaction.\n");
EXEC SQL ROLLBACK;
EMB_SQL_CHECK("Transaction -- Rollback");
return 0;
} /* StaticStmtWithHostVarsInvoke */
int DynamicStmtEXECUTE_IMMEDIATE(void)
{
struct sqlca sqlca;
EXEC SQL BEGIN DECLARE SECTION;
char stmt1[50];
char stmt2[50];
EXEC SQL END DECLARE SECTION;
printf("\n-----------------------------------------------------------");
printf("\nUSE THE SQL STATEMENT:\n");
printf(" EXECUTE IMMEDIATE\n");
printf("TO SHOW HOW TO USE SQL STATEMENTS WITH 'EXECUTE IMMEDIATE'.\n");
/* create a table */
strcpy(stmt1, "CREATE TABLE table1(col1 INTEGER)");
printf("\n Execute the statement\n");
printf(" EXECUTE IMMEDIATE :stmt1\n");
printf(" for\n");
printf(" stmt1 = %s\n", stmt1);
EXEC SQL EXECUTE IMMEDIATE :stmt1;
EMB_SQL_CHECK("Stmt1 -- EXECUTE IMMEDIATE");
/* drop a table */
strcpy(stmt2, "DROP TABLE table1");
printf("\n Execute the statement\n");
printf(" EXECUTE IMMEDIATE :stmt2\n");
printf(" for\n");
printf(" stmt2 = %s\n", stmt2);
EXEC SQL EXECUTE IMMEDIATE :stmt2;
EMB_SQL_CHECK("Stmt2 -- EXECUTE IMMEDIATE");
return 0;
} /* DynamicStmtEXECUTE_IMMEDIATE */
int DynamicStmtEXECUTE(void)
{
struct sqlca sqlca;
EXEC SQL BEGIN DECLARE SECTION;
char hostVarStmt[50];
EXEC SQL END DECLARE SECTION;
printf("\n-----------------------------------------------------------");
printf("\nUSE THE SQL STATEMENTS:\n");
printf(" PREPARE\n");
printf(" EXECUTE\n");
printf("TO SHOW HOW TO USE SQL STATEMENTS WITH 'EXECUTE'.\n");
/* prepare the statement */
strcpy(hostVarStmt, "DELETE FROM org WHERE deptnumb = 15");
printf("\n Execute the statement\n");
printf(" PREPARE Stmt FROM :hostVarStmt\n");
printf(" for\n");
printf(" hostVarStmt = %s\n", hostVarStmt);
EXEC SQL PREPARE Stmt FROM :hostVarStmt;
EMB_SQL_CHECK("Stmt -- Prepare");
/* execute the statement */
printf("\n Execute the statement\n");
printf(" EXECUTE Stmt\n");
EXEC SQL EXECUTE Stmt;
EMB_SQL_CHECK("Stmt -- Execute");
/* ROLLBACK the transaction */
printf("\n Rollback the transaction.\n");
EXEC SQL ROLLBACK;
EMB_SQL_CHECK("Transaction -- Rollback");
return 0;
} /* DynamicStmtEXECUTE */
int DynamicStmtWithMarkersEXECUTEusingHostVars(void)
{
struct sqlca sqlca;
EXEC SQL BEGIN DECLARE SECTION;
char hostVarStmt1[50];
short hostVarDeptnumb;
EXEC SQL END DECLARE SECTION;
printf("\n-----------------------------------------------------------");
printf("\nUSE THE SQL STATEMENTS:\n");
printf(" PREPARE\n");
printf(" EXECUTE\n");
printf("TO SHOW SQL STATEMENTS WITH 'EXECUTE'" );
printf(" AND HOST VARIABLES.\n");
/* prepare the statement */
strcpy(hostVarStmt1, "DELETE FROM org WHERE deptnumb = :dept");
printf("\n Execute the statement\n");
printf(" PREPARE Stmt1 FROM :hostVarStmt1\n");
printf(" for\n");
printf(" hostVarStmt1 = %s\n", hostVarStmt1);
EXEC SQL PREPARE Stmt1 FROM :hostVarStmt1;
EMB_SQL_CHECK("Stmt1 -- Prepare");
/* execute the statement for hostVarDeptnumb = 15 */
hostVarDeptnumb = 15;
printf("\n Execute the statement\n");
printf(" EXECUTE Stmt1 USING :hostVarDeptnumb\n");
printf(" for\n");
printf(" hostVarDeptnumb = %d\n", hostVarDeptnumb);
EXEC SQL EXECUTE Stmt1 USING :hostVarDeptnumb;
EMB_SQL_CHECK("Stmt1 -- Execute with Host Variables 1");
/* execute the statement for hostVarDeptnumb = 84 */
hostVarDeptnumb = 84;
printf("\n Execute the statement\n");
printf(" EXECUTE Stmt1 USING :hostVarDeptnumb\n");
printf(" for\n");
printf(" hostVarDeptnumb = %d\n", hostVarDeptnumb);
EXEC SQL EXECUTE Stmt1 USING :hostVarDeptnumb;
EMB_SQL_CHECK("Stmt1 -- Execute with Host Variables 2");
/* rollback the transaction */
printf("\n Rollback the transaction.\n");
EXEC SQL ROLLBACK;
EMB_SQL_CHECK("Transaction -- Rollback");
return 0;
} /* DynamicStmtWithMarkersEXECUTEusingHostVars */
int DynamicStmtWithMarkersEXECUTEusingSQLDA(void)
{
struct sqlca sqlca;
struct sqlda *pSqlda;
short deptnumb = 0;
short deptnumbInd = 0;
EXEC SQL BEGIN DECLARE SECTION;
char hostVarStmt2[50];
EXEC SQL END DECLARE SECTION;
printf("\n-----------------------------------------------------------");
printf("\nUSE THE SQL STATEMENTS:\n");
printf(" PREPARE\n");
printf(" EXECUTE USING DESCRIPTOR\n");
printf("TO SHOW SQL STATEMENTS WITH 'EXECUTE' AND THE SQLDA.\n");
/* prepare the statement */
strcpy(hostVarStmt2, "DELETE FROM org WHERE deptnumb = :dept");
printf("\n Execute the statement\n");
printf(" PREPARE Stmt2 FROM :hostVarStmt2\n");
printf(" for\n");
printf(" hostVarStmt2 = DELETE FROM org WHERE deptnumb = :dept\n");
EXEC SQL PREPARE Stmt2 FROM :hostVarStmt2;
EMB_SQL_CHECK("Stmt2 -- Prepare");
/* initialize sqlda */
printf("\n Initialize the SQLDA structure.\n");
pSqlda = (struct sqlda *)malloc(SQLDASIZE(1)); /* one marker */
strncpy(pSqlda->sqldaid, "SQLDA ", sizeof(pSqlda->sqldaid));
pSqlda->sqldabc = (sqlint32)SQLDASIZE(1);
pSqlda->sqln = 1; /* one marker */
pSqlda->sqld = 1;
pSqlda->sqlvar[0].sqltype = SQL_TYP_NSMALL;
pSqlda->sqlvar[0].sqllen = sizeof(short);
pSqlda->sqlvar[0].sqldata = (char *)&deptnumb;
pSqlda->sqlvar[0].sqlind = (short *)&deptnumbInd;
/* execute the statement for deptnumb=15 */
deptnumb = 15;
printf("\n Execute the statement\n");
printf(" EXECUTE THE STATEMENT Stmt2 USING DESCRIPTOR :*pSqlda\n");
printf(" for\n");
printf(" deptnumb = %d\n", deptnumb);
EXEC SQL EXECUTE Stmt2 USING DESCRIPTOR :*pSqlda;
EMB_SQL_CHECK("Stmt2 -- Execute with SQLDA");
/* execute the statement for deptnumb=84 */
deptnumb = 84;
printf("\n Execute the statement\n");
printf(" EXECUTE THE STATEMENT Stmt2 USING DESCRIPTOR :*pSqlda\n");
printf(" for\n");
printf(" deptnumb = %d\n", deptnumb);
EXEC SQL EXECUTE Stmt2 USING DESCRIPTOR :*pSqlda;
EMB_SQL_CHECK("Stmt2 -- Execute with SQLDA");
/* ROLLBACK the transaction */
printf("\n Rollback the transaction.\n");
EXEC SQL ROLLBACK;
EMB_SQL_CHECK("Transaction -- Rollback");
/* memory allocated -- free */
free(pSqlda);
return 0;
} /* DynamicStmtWithMarkersEXECUTEusingSQLDA */
int CompoundStmtInvoke(void)
{
struct sqlca sqlca;
EXEC SQL BEGIN DECLARE SECTION;
char subStmt1[200];
char subStmt2[200];
char subStmt3[200];
EXEC SQL END DECLARE SECTION;
printf("\n-----------------------------------------------------------");
printf("\nUSE THE SQL STATEMENTS:\n");
printf(" CREATE TABLE\n");
printf(" PREPARE\n");
printf(" COMPOUND SQL (EMBEDDED)\n");
printf(" EXECUTE\n");
printf(" DROP TABLE\n");
printf("TO SHOW COMPOUND SQL STATEMENTS.\n");
/* create the table awards */
printf("\n Execute the statement\n");
printf(" CREATE TABLE awards(id INTEGER, award CHAR(12)\n");
EXEC SQL CREATE TABLE awards(id INTEGER, award CHAR(12));
EMB_SQL_CHECK("awards TABLE -- Create");
/* prepare the substatements */
strcpy(subStmt1, "INSERT INTO awards(id, award) ");
strcat(subStmt1, " SELECT id, 'Sales Merit' ");
strcat(subStmt1, " FROM staff ");
strcat(subStmt1, " WHERE job = 'Sales' AND (comm/100 > years)");
printf("\n Prepare the substatement1\n");
printf(" INSERT INTO awards(id, award)\n");
printf(" SELECT id, 'Sales Merit'\n");
printf(" FROM staff\n");
printf(" WHERE job = 'Sales' AND (comm/100 > years)\n");
EXEC SQL PREPARE SubStmt1 FROM :subStmt1;
EMB_SQL_CHECK("Substatement1 -- Prepare");
strcpy(subStmt2, "INSERT INTO awards(id, award) ");
strcat(subStmt2, " SELECT id, 'Clerk Merit' ");
strcat(subStmt2, " FROM staff ");
strcat(subStmt2, " WHERE job = 'Clerk' AND (comm/50 > years)");
printf("\n Prepare the substatement2\n");
printf(" INSERT INTO awards(id, award)\n");
printf(" SELECT id, 'Clerk Merit'\n");
printf(" FROM staff\n");
printf(" WHERE job = 'Clerk' AND (comm/50 > years)\n");
EXEC SQL PREPARE SubStmt2 FROM :subStmt2;
EMB_SQL_CHECK("Substatement2 -- Prepare");
strcpy(subStmt3, "INSERT INTO awards(id, award) ");
strcat(subStmt3, " SELECT id, 'Best' concat job ");
strcat(subStmt3, " FROM staff ");
strcat(subStmt3, " WHERE comm = (SELECT max(comm) ");
strcat(subStmt3, " FROM staff ");
strcat(subStmt3, " WHERE job = 'Clerk')");
printf("\n Prepare the substatement3\n");
printf(" INSERT INTO awards(id, award)\n");
printf(" SELECT id, 'Best' concat job\n");
printf(" FROM staff\n");
printf(" WHERE comm = (SELECT max(comm)\n");
printf(" FROM staff\n");
printf(" WHERE job = 'Clerk')\n");
EXEC SQL PREPARE SubStmt3 FROM :subStmt3;
EMB_SQL_CHECK("Substatement3 -- Prepare");
/* execute the embedded compound statement */
printf("\n Execute the statement\n");
printf(" BEGIN COMPOUND NOT ATOMIC STATIC\n");
printf(" EXECUTE SubStmt1;\n");
printf(" EXECUTE SubStmt2;\n");
printf(" EXECUTE SubStmt3;\n");
printf(" COMMIT;\n");
printf(" END COMPOUND;\n");
EXEC SQL BEGIN COMPOUND NOT ATOMIC STATIC
EXECUTE SubStmt1;
EXECUTE SubStmt2;
EXECUTE SubStmt3;
COMMIT;
END COMPOUND;
EMB_SQL_CHECK("Compound -- Invoke");
/* drop the table awards */
printf("\n Execute the statement\n");
printf(" DROP TABLE awards\n");
EXEC SQL DROP TABLE awards;
EMB_SQL_CHECK("awards TABLE -- Drop");
return 0;
} /* CompoundStmtInvoke */