This example demonstrates the strict
numeric type checking on SELECT statements.
#include <iostream>
using namespace std;
#include <stdio.h>
// #define OTL_ODBC_UNIX // uncomment this line if UnixODBC is used
#define OTL_ODBC_ALTERNATE_RPC
#if !defined(_WIN32) && !defined(_WIN64)
#define OTL_ODBC
#else
#define OTL_ODBC_POSTGRESQL // required with PG ODBC on Windows
#endif
#define OTL_STRICT_NUMERIC_TYPE_CHECK_ON_SELECT
#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[31]>)",
// SQL statement
db // connect object
);
char tmp[32];
for(int i=1;i<=100;++i){
sprintf(tmp,"Name%d",i);
o<<i<<tmp;
}
}
void select()
{
otl_stream i(50, // buffer size
"select "
" f1, "
" f2 "
"from test_tab "
"where f1>=:f11<int> "
" and f1<=:f12<int>*2",
// SELECT statement
db // connect object
);
// create select stream
int f1_1;
float f1_2;
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_1>>f2;
cout<<"f1="<<f1_1<<", f2="<<f2<<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_2>>f2;
cout<<"f1="<<f1_2<<", f2="<<f2<<endl;
}
}
int main()
{
otl_connect::otl_initialize(); // initialize the database API environment
try{
db.rlogon("scott/tiger@postgresql"); // connect to the database API
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(30))"
); // create table
db.commit();
insert(); // insert records into table
select(); // select records from table
}
catch(otl_exception& p){ // intercept OTL exceptions
cerr<<p.code<<endl; // print out error code
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
32000
Incompatible data types in stream operation
select f1, f2 from test_tab where f1>=? and f1<=? *2
Column: 1<INT>, datatype in operator <</>>: FLOAT
Copyright © 1996-2024, Sergei Kuchin, email: skuchin@gmail.com, skuchin@gmail.com/a>.