# OTL 4.0, Example 164 (otl_stream::clean(), cleaning the SELECT stream's error flags, Oracle 7/8/8i/9i)

# Example 164 (otl_stream::clean(), cleaning the SELECT stream's error flags, Oracle 7/8/8i/9i)

This example demonstrates the extended functionality of the otl_stream::clean() function.

## Source Code

##

    #include <iostream>
    #include <stdio.h>
    using namespace std;

    // Uncomment the line below when OCI7 is used with OTL
    // #define OTL_ORA7 // Compile OTL 4.0/OCI7
    #define OTL_ORA8I // Compile OTL 4.0/OCI
    // Uncomment the line below in case of Oracle 9i
    //#define OTL_ORA9I
    #include <otlv4.h> // include the OTL 4.0 header file

    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()
    {
     otl_stream i(50, // buffer size
                  "select * from test_tab where f1>=:f<char[40]> and f1<=:f*2",
                     // SELECT statement
                  db // connect object
                 );
       // create select stream

     float f1;
     char f2[31];

     try{
      cout<<"====> Starting a fetch sequence...."<<endl;
      i<<"xxx8"; // assigning :f = "xxx8", it's obviously
                 // invalid for a numeric column
        // 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;
      }
     }catch(otl_exception& p){
      cerr<<"===> A database exception is caught: "<<endl;
      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
      cerr<<"===> Cleaning up the stream's error flags"<<endl;
      i.clean();
     }

     cout<<"====> Starting another fetch sequence..."<<endl;
     i<<"4"; // assigning :f = 4
       // 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;
     }

    }

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

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

      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

      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 the database

     return 0;

    }

    Output
    ====> Starting a fetch sequence....
    ===> A database exception is caught:
    ORA-01722: invalid number

    select * from test_tab where f1>=:f           and f1<=:f*2

    ===> Cleaning up the stream's error flags
    ====> Starting another fetch sequence...
    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@gmail.com

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