# OTL 4.0, Example 198 (Unicode, VARCHAR2, and otl_refcur_stream)

# Example 198 (Unicode, VARCHAR2, and otl_refcur_stream)

## Source Code

    #include <iostream>
    using namespace std;

    #include <stdio.h>

    #define OTL_ORA9I // Compile OTL 4.0/OCI9i
    #define OTL_UNICODE // Enable Unicode OTL for OCI9i
    #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];
     unsigned short tmp2[32]; // Null terminated Unicode character array.

     for(int i=1;i<=100;++i){
      sprintf(tmp,"Name%d",i);
      unsigned short* c2=tmp2;
      char* c1=tmp;
    // Unicode's first 128 characters are ASCII (0..127), so
    // all is needed for converting ASCII into Unicode is as follows:
      while(*c1){
       *c2=(unsigned char)*c1;
       ++c1; ++c2;
      }
      *c2=0; // target Unicode string is null terminated,
             // only the null terminator is a two-byte character,
             // not one-byte
      o<<(float)i;
      o<<(unsigned char*)tmp2;
       // overloaded operator<<(const unsigned char*) in the case of Unicode
       // OTL accepts a pointer to a Unicode character array.
       // operator<<(const unsigned short*) wasn't overloaded
       // in order to avoid ambiguity in C++ type casting.
     }

    }

    void select()
    {
     otl_stream i(1, // buffer size
                  "begin "
                  " open :cur<refcur,out[50]> for "
         // :cur is a bind variable name, refcur -- its type,
         // out -- output parameter, 50 -- the buffer size when this
         // reference cursor will be attached to otl_refcur_stream
                  "  select * "
                  "  from test_tab "
                  "  where f1>=:f<int,in> and f1<=:f*2; "
                  "end;", // PL/SQL block returns a referenced cursor
                  db // connect object
                 );
       // create select stream with referenced cursor

      i.set_commit(0); // set stream "auto-commit" to OFF.

     float f1;
     unsigned short f2[32];

     otl_refcur_stream s; // reference cursor stream for reading rows.

     i<<8; // assigning :f = 8
     i>>s; // initializing the refrence cursor stream with the output
           // reference cursor.

     while(!s.eof()){ // while not end-of-data
      s>>f1;
      s>>(unsigned char*)f2;
        // overloaded operator>>(unsigned char*) in the case of Unicode
        // OTL accepts a pointer to a Unicode chracter array.
        // operator>>(unsigned short*) wasn't overloaded
        // in order to avoid ambiguity in C++ type casting.
      cout<<"f1="<<f1<<", f2=";
    // Unicode's first 128 characters are ASCII, so in order
    // to convert Unicode back to ASCII all is needed is
    // as follows:
       for(int j=0;f2[j]!=0;++j){
         cout<<(char)f2[j];
       }
       cout<<endl;
     }

     s.close(); // closing the reference cursor

     i<<4; // assigning :f = 4
     i>>s;

     while(!s.eof()){ // while not end-of-data
      s>>f1;
      s>>(unsigned char*)f2;
        // overloaded operator>>(unsigned char*) in the case of Unicode
        // OTL accepts a pointer to a Unicode chracter array.
        // operator>>(unsigned short*) wasn't overloaded
        // in order to avoid ambiguity in C++ type casting.
      cout<<"f1="<<f1<<", f2=";
    // Unicode's first 128 characters are ASCII, so in order
    // to convert Unicode back to ASCII all is needed is
    // as follows:
       for(int j=0;f2[j]!=0;++j){
         cout<<(char)f2[j];
       }
       cout<<endl;
     }

     // there is no need to explicitly calls s.close() since s's destructor
     // will take care of closing the stream
    }

    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

      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=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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