# OTL 4.0, Example 66 (Simple Insert/Select and otl_stream::clean() function for Oracle 8/8i)

# Example 66 (Simple Insert/Select and otl_stream::clean() function for Oracle 8/8i)

This example demonstrates simple INSERT, SELECT and the use of the otl_stream::clean() function for Oracle 8/8i.

## Source Code

    #include <iostream>
    using namespace std;

    #include <stdio.h>

    #define OTL_ORA8 // Compile OTL 4.0/OCI8
    #include <otlv4.h> // include the OTL 4.0 header file

    otl_connect db; // connect object

    void insert()
    // insert rows into table
    {
     otl_stream o(10, // buffer size
                  "insert into test_tab values(:f1<int>,:f2<char[31]>)",
                     // SQL statement
                  db // connect object
                 );

     o.set_commit(0); // set stream's auto-commit to OFF.

     try{
      o<<1<<"Line1"; // Enter one row into the stream
      o.flush(); // flush the strem buffer, i.e. force
                 // the stream to execute
      o<<1<<"Line1"; // Enter the same data into the stream
                     // and cause a "duplicate key" error.
      o.flush();
     }catch(otl_exception& p){
      if(p.code==1){
       // ORA-0001: ... duplicate key ...
       o.clean(1); // clean up the stream's buffer
                   // and clean up thestream's internal
                   // error flag as well. By doing this,
                   // it's possible to recover from
                   // a database error without closing
                   // the stream. Remember, the number of
                   // situtation when it's possible is
                   // limited and the recover procedure should
                   // be carefully designed.
      }else
       throw; // re-throw the exception to the outer catch block.
     }

     o<<2<<"Line2"; // Enter one more row of data after
                    // recovering from the "duplicate key"
                    // error
     o.flush();

     db.commit(); // commit transaction

    }

    void select()
    {
     otl_stream i(10, // buffer size
                  "select * from test_tab",
                     // SELECT statement
                  db // connect object
                 );
       // create select stream

     int f1;
     char f2[31];

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

    }

    int main()
    {
     otl_connect::otl_initialize(); // initialize OCI environment
     try{

      db.rlogon("scott/tiger"); // connect to Oracle

      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 number, f2 varchar2(30))"
        );  // create table

      otl_cursor::direct_exec
       (
        db,
        "create unique index ind001 on test_tab(f1)"
        );  // create unique index

      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.stm_text<<endl; // print out SQL that caused the error
      cerr<<p.var_info<<endl; // print out the variable that caused the error
     }

     db.logoff(); // disconnect from Oracle

     return 0;

    }

## Output

    f1=1, f2=Line1
    f1=2, f2=Line2

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Copyright © 1996, 2007, Sergei Kuchin, email: skuchin@ispwest.com, skuchin@gmail.com.

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