#include <iostream>
using namespace std;
#include <string.h>
class user_defined_string{
public:
user_defined_string(void)
{
buf[0]=0;
}
user_defined_string(const char* s)
{
strcpy(buf,s);
}
user_defined_string(const user_defined_string& s)
{
strcpy(buf,s.buf);
}
~user_defined_string(){}
user_defined_string& operator=(const char* s)
{
strcpy(buf,s);
return *this;
}
void assign(int size,char filler)
{
for(int i=0;i<size;++i)
buf[i]=filler;
buf[size]=0;
}
void assign(char* temp_buf,int len)
{
for(int i=0;i<len;++i)
buf[i]=temp_buf[i];
buf[len]=0;
}
char& operator[](int ndx)
{
return buf[ndx];
}
int length(void) const
{
return (int)strlen(buf);
}
user_defined_string& operator=(const user_defined_string& s)
{
strcpy(buf,s.buf);
return *this;
}
const char* c_str(void) const
{
return buf;
}
user_defined_string& operator+=(const user_defined_string& s)
{
strcat(buf,s.buf);
return *this;
}
protected:
char buf[70000];
};
ostream& operator<<(ostream& s,const user_defined_string& str)
{
s<<str.c_str();
return s;
}
// Compile OTL 4.0/ODBC in Windows. Informix CLI uses the
// regular ODBC header files in Windows
#define OTL_ODBC
// Uncomment the #defines below in Linux / Unix
//#define OTL_ODBC_UNIX
//#define OTL_INFORMIX_CLI
#define OTL_USER_DEFINED_STRING_CLASS_ON
#define USER_DEFINED_STRING_CLASS user_defined_string
#include <otlv4.h> // include the OTL 4.0 header file
otl_connect db; // connect object
void insert()
// insert rows into table
{
user_defined_string f2;
db.set_max_long_size(70000); // set maximum long string size for connect object
otl_stream o(1, // buffer size has to be set to 1 for operations with LOBs
"insert into test_tab values(:f1<int>,:f2<varchar_long>)",
// SQL statement
db // connect object
);
for(int i=1;i<=20;++i){
f2.assign(50001,' ');
for(int j=0;j<50000;++j)
f2[j]='*';
f2[50000]='?';
f2[50001]=0;
o<<i<<f2;
}
}
void select()
{
user_defined_string f2;
db.set_max_long_size(70000); // set maximum long string size for connect object
otl_stream i(1, // buffer size needs to be set to 1 for operations with LOBs
"select * from test_tab where f1>=:f11<int> and f1<=:f12<int>*2",
// SELECT statement
db // connect object
);
// create select stream
float f1;
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[0]<<f2[f2.length()-1]<<", len="
<<f2.length()<<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>>f2;
cout<<"f1="<<f1<<", f2="<<f2[0]<<f2[f2.length()-1]<<", len="
<<f2.length()<<endl;
}
}
int main()
{
otl_connect::otl_initialize(); // initialize Informix environment
try{
db.rlogon("informix/tigger@informixsql"); // connect to Informix
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 int, f2 text)"
); // 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 Informix
return 0;
}
f1=8, f2=*?, len=50001
f1=9, f2=*?, len=50001
f1=10, f2=*?, len=50001
f1=11, f2=*?, len=50001
f1=12, f2=*?, len=50001
f1=13, f2=*?, len=50001
f1=14, f2=*?, len=50001
f1=15, f2=*?, len=50001
f1=16, f2=*?, len=50001
f1=4, f2=*?, len=50001
f1=5, f2=*?, len=50001
f1=6, f2=*?, len=50001
f1=7, f2=*?, len=50001
f1=8, f2=*?, len=50001
Copyright © 1996-2024, Sergei Kuchin, email: skuchin@gmail.com, skuchin@gmail.com/a>.