OTL 4.0, Example 25 (Implicit Select/Result Set returned by a stored procedure)

Example 25 (Implicit Select/Result Set returned by a stored procedure)

This example demonstrates a stored procedure call.

Source Code

#include <iostream>
using namespace std;

#include <stdio.h>
#define OTL_ODBC // Compile OTL 4.0/ODBC
#include <otlv4.h>

otl_connect db; // connect object

void insert()
// insert rows into table
{
otl_stream o(50, // buffer size
"insert into test_tab values(:f1<float>,:f2<char[31]>)",
// SQL statement
db // connect object
);
char tmp[32];

for(int i=1;i<=100;++i){
sprintf(tmp,"Name%d",i);
o<<(float)i<<tmp;
}
}

void select(void)
// fetching result set returned by a stored procedure
{
otl_stream i(50, // buffer size
"{call my_proc(:f1<int,in>)}",
// implicit SELECT statement
db, // connect object
otl_implicit_select // implicit SELECT statement
);
// create select stream

int f1;
char f2[31];

i<<8; // assigning :f1 = 8
// SELECT automatically executes when all input variables are
// assigned. First portion of output rows is fetched to the buffer

while(!i.eof()){ // while not end-of-data
i>>f1>>f2;
cout<<"f1="<<f1<<", f2="<<f2<<endl;
}

i<<4; // assigning :f1 = 4
// SELECT automatically re-executes when all input variables are
// assigned. First portion of out rows is fetched to the buffer

while(!i.eof()){ // while not end-of-data
i>>f1>>f2;
cout<<"f1="<<f1<<", f2="<<f2<<endl;
}

}

int main()
{
otl_connect::otl_initialize(); // initialize ODBC environment
try{
db.rlogon("uid=scott;pwd=tiger;dsn=mssql"); // connect to ODBC
otl_cursor::direct_exec
(
db,
"drop table test_tab",
otl_exception::disabled // disable OTL exceptions
); // drop table

otl_cursor::direct_exec
(
db,
"create table test_tab(f1 int, f2 varchar(30))"
); // create table

otl_cursor::direct_exec
(
db,
"DROP PROCEDURE my_proc",
0 // ignore any errors
); // drop stored procedure

otl_cursor::direct_exec
(
db,
"CREATE PROCEDURE my_proc "
" @F1 int "
"AS "
"SELECT * FROM test_tab "
"WHERE f1>=@F1 AND f1<=@F1*2 "
); // create stored procedure


insert(); // insert records into table
select(); // select records from table


}
catch(otl_exception& p){ // intercept OTL exceptions
cerr<<p.msg<<endl; // print out error message
cerr<<p.code<<endl; // print out error code
cerr<<p.var_info<<endl; // print out the variable that caused the error
cerr<<p.sqlstate<<endl; // print out SQLSTATE message
cerr<<p.stm_text<<endl; // print out SQL that caused the error
}
db.logoff(); // disconnect from the data source
return 0;
}


Output

f1=8, f2=Name8
f1=9, f2=Name9
f1=10, f2=Name10
f1=11, f2=Name11
f1=12, f2=Name12
f1=13, f2=Name13
f1=14, f2=Name14
f1=15, f2=Name15
f1=16, f2=Name16
f1=4, f2=Name4
f1=5, f2=Name5
f1=6, f2=Name6
f1=7, f2=Name7
f1=8, f2=Name8


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Copyright © 1996-2017, Sergei Kuchin, email: skuchin@gmail.com, skuchin@gmail.com .

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