# 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, 2007, Sergei Kuchin, email: skuchin@ispwest.com, skuchin@yahogmail
.

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