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<title>OTL 4.0, SAP DB, Example 2 (Implicit Select/Result Set returned by a stored procedure)</title>
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<h1>
OTL 4.0, SAP DB, Example 2 (<b>Implicit Select/Result Set returned by a
stored procedure</b>)</h1></center>
<h1>
SAP DB, Example 2 (<b>Implicit Select/Result Set returned by a stored procedure</b>)</h1>
This example demonstrates a SAP DB stored procedure call that returns a
result set.
<h2>
Source Code</h2>
<pre>#include <iostream.h>
#include <stdio.h>
#define OTL_ODBC // Compile OTL 4.0/ODBC
#include <otlv4.h>
<a href="otl3_connect_class.htm">otl_connect</a> db; // connect object
void insert()
// insert rows into table
{
<a href="otl3_stream_class.htm">otl_stream</a> 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
{
<a href="otl3_stream_class.htm">otl_stream</a> i(50, // buffer size
"{call my_proc(:f1<int,in>)}",
// implicit SELECT statement
db, // connect object
<a href="otl3_stream_class.htm#implicit_select">otl_implicit_select</a> // 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=sapdb"); // 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 DBPROC my_proc "
" (IN F1 INTEGER) "
" RETURNS CURSOR "
"AS "
"$CURSOR = 'F1_CURSOR'; "
"DECLARE :$CURSOR CURSOR FOR SELECT * FROM SCOTT.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;
}
</pre>
<h2>
Output</h2>
<pre> A=2, B=Test String1
<hr WIDTH="100%"></pre>
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