This example demonstrates a simple INSERT, SELECT, constant SQL
statements, and otl_connect::operator<<, <<=, >>().
#include <iostream>
using namespace std;
#include <stdio.h>
#define OTL_ODBC_ENTERPRISEDB // Compile OTL 4.0/EnterpriseDB-ODBC
// Uncomment the #define below when used in Linux / Unix
//#define OTL_ODBC_UNIX
#include <otlv4.h> // include the OTL 4.0 header file
otl_connect db; // connect object
void insert()
// insert rows into table
{
otl_stream o;
o.setBufSize(50);
// Send a message (SQL statement) to the otl_connect object.
db<<="insert into test_tab values(:f1<int>,:f2<char[31]>)";
// Send a message (SQL statement) from the connect object
// to the otl_stream object.
db>>o;
// By and large, this is all syntactical sugar, but "some like it hot".
char tmp[32];
for(int i=1;i<=100;++i){
sprintf(tmp,"Name%d",i);
o<<i<<tmp;
}
}
void select()
{
otl_stream i;
i.setBufSize(50);
// Send a message (SQL statement) to the otl_connect object.
db<<="select * from test_tab where f1>=:f11<int> and f1<=:f12<int>*2";
// Send a message (SQL statement) from the connect object
// to the otl_stream object.
db>>i;
// By and large, this is all syntactical sugar, but "some like it hot".
int f1;
char f2[31];
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>>f2;
cout<<"f1="<<f1<<", f2="<<f2<<endl;
}
i<<4<<4; // 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>>f2;
cout<<"f1="<<f1<<", f2="<<f2<<endl;
}
}
int main()
{
otl_connect::otl_initialize(); // initialize the database API environment
try{
db<<"scott/tiger@edbsql"; // connect to the database
// Send SQL statements to the connect obejct for immediate execution.
// Ignore any exception for the first statement.
try{ db<<"drop table test_tab"; } catch(otl_exception&){}
db<<"create table test_tab(f1 int, f2 varchar(30))";
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;
}
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
Copyright © 1996-2024, Sergei Kuchin, email: skuchin@gmail.com, skuchin@gmail.com/A>.