#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 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;
}
protected:
char buf[70000];
};
ostream& operator<<(ostream& s,const user_defined_string& str)
{
s<<str.c_str();
return s;
}
// #define OTL_ORA8 // Compile OTL 4.0/OCI8
// #define OTL_ORA8I // Compile OTL 4.0/OCI8i
#define OTL_ORA9I // Compile OTL 4.0/OCI9i
#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
r>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>,empty_clob()) "
"returning f2 into :f2<clob>",
// 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 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 clob)"
); // 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;
}
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 © 1996-2023, Sergei Kuchin, email: skuchin@gmail.com, skuchin@gmail.com/a>.
Permission to use, copy, modify and redistribute this document for any purpose is hereby granted without fee, provided that the above copyright notice appear in all copies. THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.