OTL 4.0, Example 348 (Simple Unicode Insert/Select and VARCHAR strings)

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

Source Code

#include <iostream>
using namespace std;

#include <stdio.h>
#define OTL_ODBC_ALTERNATE_RPC
#define OTL_ODBC_POSTGRESQL // Compile OTL 4.0/ODBC
#define OTL_UNICODE // Enable Unicode OTL for ODBC
#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<int>,:f2<char[5]>)", 
                 // SQL statement, char[5] means 5 2-byte
// Unicode charatcters including a null
// terminator
              db // connect object
             );

 unsigned short tmp[32]; // Null terminated Unicode character array.

 for(int i=1;i<=100;++i){
  o<<i;
tmp[0]=1111; // Unicode character (decimal code of 1111)
tmp[1]=2222; // Unicode character (decimal code of 2222)
 tmp[2]=3333; // Unicode chracater (decimal code of 3333)
tmp[3]=4444; // Unicode chracater (decimal code of 4444)
tmp[4]=0; // Unicode null terminator
  o<<(unsigned char*)tmp; 
   // 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>=:f11<int> "
" and f1<=:f12<int>*2",
                 // SELECT statement
              db // connect object
             ); 
   // create select stream
 
 int f1;
 unsigned short f2[32];

 i<<8<<8; // assigning :f11 = 8, f12 = 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=";
   for(int j=0;f2[j]!=0;++j)
     cout<<" "<<f2[j];
   cout<<endl;
 }

 i<<4<<4; // assigning :f11 = 4, :f12 = 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<<" "<<f2[j];
   cout<<endl;
 }

}

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

  db.rlogon("scott/tiger@postgresql2"); // connect to the database

  otl_cursor::direct_exec
   (
    db,
    "drop table test_tab",
    otl_exception::disabled // disable OTL exceptions
   ); // drop table
db.commit();
  otl_cursor::direct_exec
   (
    db,
    "create table test_tab(f1 int, f2 varchar(4))"
    );  // create table
db.commit();
  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

f1=8, f2= 1111 2222 3333 4444
f1=9, f2= 1111 2222 3333 4444
f1=10, f2= 1111 2222 3333 4444
f1=11, f2= 1111 2222 3333 4444
f1=12, f2= 1111 2222 3333 4444
f1=13, f2= 1111 2222 3333 4444
f1=14, f2= 1111 2222 3333 4444
f1=15, f2= 1111 2222 3333 4444
f1=16, f2= 1111 2222 3333 4444
f1=4, f2= 1111 2222 3333 4444
f1=5, f2= 1111 2222 3333 4444
f1=6, f2= 1111 2222 3333 4444
f1=7, f2= 1111 2222 3333 4444
f1=8, f2= 1111 2222 3333 4444



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Copyright © 1996-2017, Sergei Kuchin, email: skuchin@gmail.com, skuchin@gmail.com .

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