OTL 4.0, Example 174 (Simple Unicode Insert/Select)

Example 174 (Simple Unicode Insert/Select)

This example demonstrates a simple Unicode INSERT, SELECT and constant SQL statements.

Source Code

#include <iostream>
using namespace std;

#include <stdio.h>

#define OTL_ORA8I // Compile OTL 4.0/OCI8i
#define OTL_UNICODE // Enable Unicode OTL for OCI8i
#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(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;
 unsigned short f2[32];

 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;
  i>>(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;
 }

 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>>(unsigned char*)f2;
  cout<<"f1="<<f1<<", f2=";
   for(int j=0;f2[j]!=0;++j){
     cout<<(char)f2[j];
   }
   cout<<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(60))"
    );  // 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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