# OTL 4.0, Example 58 (Using OTL/OCI7 in Pro*C/C++ environment)

# Example 58 (Using OTL/OCI7 in Pro*C/C++ environment)

This example demonstrates how to use OTL/OCI7 classes in the Pro*C/C++ legacy environment (or in any other third-party library, based on OCI7). The assumption is that the primary connection is made in Pro*C/C++ and the OTL connect object gets attached to that primary connection.

## Source Code

    #include <iostream>
    using namespace std;

    #include <stdio.h>
    #include <stdio.h>
    #include <string.h>
    #include <stdlib.h>

    #define OTL_ORA7 // Compile OTL 4.0/OCI7
    #include <otlv4.h> // include the OTL 4.0 header file

    EXEC SQL INCLUDE SQLCA;
    typedef char CSTR[256];

    EXEC SQL BEGIN DECLARE SECTION;
      EXEC SQL TYPE CSTR IS STRING(256);
      CSTR UserId;
    EXEC SQL END DECLARE SECTION;

    void sqlerror(void)
    {
     EXEC SQL WHENEVER SQLERROR CONTINUE;
     fprintf(stderr,"\n%s\n",sqlca.sqlerrm.sqlerrmc);
     EXEC SQL ROLLBACK RELEASE;
     exit(1);
    }
    EXEC SQL WHENEVER SQLERROR DO sqlerror();

    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<int> and f1<=:f*2",
                     // SELECT statement
                  db // connect object
                 );
       // create select stream

     float f1;
     char f2[31];

     i<<8; // assigning :f = 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 :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()
    {

     Lda_Def lda; // OCI7's LDA structure

     strcpy(UserId,"scott/tiger");
     EXEC SQL CONNECT :UserId; // connect to Oracle (primary connection)
     sqllda(&lda); // get an OCI7 formatted lda from the Pro*C/C++
                   // primary connection

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

      db.rlogon(&lda); // attach to the primary Pro*C/C++ connection

      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

      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(); // detach from the primary Pro*C/C++ connection

     EXEC SQL COMMIT RELEASE;

     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@gmail.com.

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