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/***************************************************************************
my_result.c - description
---------------------
begin : Wed Sep 8 2001
copyright : (C) MySQL AB 1995-2002, www.mysql.com
author : venu ( venu@mysql.com )
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
/***************************************************************************
* *
* This is a basic sample to demonstrate how to get the resultset *
* using MySQL ODBC 3.51 driver *
* *
***************************************************************************/
#include "my_utility.h" /* MyODBC 3.51 sample utility header */
/********************************************************
* result set demo *
*********************************************************/
void my_resultset(SQLHDBC hdbc, SQLHSTMT hstmt)
{
SQLRETURN rc;
SQLUINTEGER nRowCount=0, pcColDef;
SQLCHAR szColName[MAX_NAME_LEN];
SQLCHAR szData[MAX_COLUMNS][MAX_ROW_DATA_LEN]={0};
SQLSMALLINT nIndex,ncol,pfSqlType, pcbScale, pfNullable;
printf("\nmy_resultset:\n");
/* drop table 'myodbc3_demo_result' if it already exists */
rc = SQLExecDirect(hstmt,"DROP TABLE if exists myodbc3_demo_result",SQL_NTS);
mystmt(hstmt,rc);
/* commit the transaction */
rc = SQLEndTran(SQL_HANDLE_DBC, hdbc, SQL_COMMIT);
mycon(hdbc,rc);
/* create the table 'myodbc3_demo_result' */
rc = SQLExecDirect(hstmt,"CREATE TABLE myodbc3_demo_result(\
id int primary key auto_increment,\
name varchar(20))",SQL_NTS);
mystmt(hstmt,rc);
rc = SQLEndTran(SQL_HANDLE_DBC, hdbc, SQL_COMMIT);
mycon(hdbc,rc);
/* insert 2 rows of data */
rc = SQLExecDirect(hstmt,"INSERT INTO myodbc3_demo_result values(\
1,'MySQL')",SQL_NTS);
mystmt(hstmt,rc);
rc = SQLExecDirect(hstmt,"INSERT INTO myodbc3_demo_result values(\
2,'MyODBC')",SQL_NTS);
mystmt(hstmt,rc);
/* commit the transaction */
rc = SQLEndTran(SQL_HANDLE_DBC, hdbc, SQL_COMMIT);
mycon(hdbc,rc);
/* update second row */
rc = SQLExecDirect(hstmt,"UPDATE myodbc3_demo_result set name=\
'MyODBC 3.51' where id=2",SQL_NTS);
mystmt(hstmt,rc);
/* commit the transaction */
rc = SQLEndTran(SQL_HANDLE_DBC, hdbc, SQL_COMMIT);
mycon(hdbc,rc);
/* now fetch back..*/
rc = SQLExecDirect(hstmt,"SELECT * from myodbc3_demo_result",SQL_NTS);
mystmt(hstmt,rc);
/* get total number of columns from the resultset */
rc = SQLNumResultCols(hstmt,&ncol);
mystmt(hstmt,rc);
printf(" total columns in resultset:%d\n\n",ncol);
/* print the column names and do the row bind */
for(nIndex = 1; nIndex <= ncol; nIndex++)
{
rc = SQLDescribeCol(hstmt,nIndex,szColName, MAX_NAME_LEN+1, NULL,
&pfSqlType,&pcColDef,&pcbScale,&pfNullable);
mystmt(hstmt,rc);
printf(" %s\t",szColName);
rc = SQLBindCol(hstmt,nIndex, SQL_C_CHAR, szData[nIndex-1],
MAX_ROW_DATA_LEN+1,NULL);
mystmt(hstmt,rc);
}
printf("\n--------------------\n");
/* now fetch row by row */
rc = SQLFetch(hstmt);
while(rc == SQL_SUCCESS || rc == SQL_SUCCESS_WITH_INFO)
{
nRowCount++;
for(nIndex=0; nIndex< ncol; nIndex++)
printf(" %s\t",szData[nIndex]);
printf("\n");
rc = SQLFetch(hstmt);
}
SQLFreeStmt(hstmt,SQL_UNBIND);
printf("\n total rows fetched:%d\n",nRowCount);
/* free the statement row bind resources */
rc = SQLFreeStmt(hstmt, SQL_UNBIND);
mystmt(hstmt,rc);
/* free the statement cursor */
rc = SQLFreeStmt(hstmt, SQL_CLOSE);
mystmt(hstmt,rc);
printf(" success!!\n");
}
/********************************************************
* main routine *
*********************************************************/
int main(int argc, char *argv[])
{
SQLHENV henv;
SQLHDBC hdbc;
SQLHSTMT hstmt;
SQLINTEGER narg;
/*
* show the usage string when the user asks for this
*/
printf("***********************************************\n");
printf("usage: my_result [DSN] [UID] [PWD] \n");
printf("***********************************************\n");
/*
* if connection string supplied through arguments, overrite
* the default one..
*/
for(narg = 1; narg < argc; narg++)
{
if ( narg == 1 )
mydsn = argv[1];
else if ( narg == 2 )
myuid = argv[2];
else if ( narg == 3 )
mypwd = argv[3];
}
/*
* connect to MySQL server
*/
myconnect(&henv,&hdbc,&hstmt);
/*
* simple resultset demo
*/
my_resultset(hdbc, hstmt);
/*
* disconnect from the server, by freeing all resources
*/
mydisconnect(&henv,&hdbc,&hstmt);
return(0);
}
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