#include <iostream> #include <string> using namespace std;
#define OTL_ORA7 // Compile OTL 4.0/OCI7
#define OTL_STL // Enable STL compatibily mode
#include <otlv4.h> // include the OTL 4.0 header file
otl_connect db; // connect object
void insert()
// insert rows into table
{
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]='?';
o<<i<<f2;
}
}
void select()
{
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>=:f<int> and f1<=:f*2",
// SELECT statement
db // connect object
);
// create select stream
float f1;
i<<8; // assigning :f = 8
// SELECT automatically executes when all input variables are
// assigned. First portion of output rows is fetched to the buffer
for(auto& it : i){ // while not end-of-data
if (
OTL 4.0, Example 220 (std::string and LONGs, Oracle 7)
OTL 4.0, Example 220 (std::string and LONGs, Oracle 7)
Example 220 (std::string and LONGs, Oracle 7)
Source Code
#include <iostream>
#include <string>
using namespace std;
#define OTL_ORA7 // Compile OTL 4.0/OCI7
#define OTL_STL // Enable STL compatibily mode
#include <otlv4.h> // include the OTL 4.0 header file
otl_connect db; // connect object
void insert()
// insert rows into table
{
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]='?';
o<<i<<f2;
}
}
void select()
{
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>=:f<int> and f1<=:f*2",
// SELECT statement
db // connect object
);
// create select stream
float f1;
i<<8; // assigning :f = 8
// SELECT automatically executes when all input variables are
// assigned. First portion of output rows is fetched to the buffer
for(auto& it : i){ // while not end-of-data
i>>f1>>f2;
cout<<"f1="<<f1<<", f2="<<f2[0]<<f2[f2.length()-1]<<", len="
<<f2.length()<<endl;
}
i<<4; // assigning :f = 4
// SELECT automatically executes when all input variables are
// assigned. First portion of output rows is fetched to the buffer
for(auto& it : i){ // 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 long)"
); // 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;
}
Output
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
Examples ContentsGo
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Copyright © 1996-2025, Sergei Kuchin, email: skuchin@gmail.com,
skuchin@gmail.com.
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.
.Value -match '^[a-zA-Z_][a-zA-Z0-9_]*>>f1>>f2;
cout<<"f1="<<f1<<", f2="<<f2[0]<<f2[f2.length()-1]<<", len="
<<f2.length()<<endl;
}
i<<4; // assigning :f = 4
// SELECT automatically executes when all input variables are
// assigned. First portion of output rows is fetched to the buffer
for(auto& it : i){ // 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 long)"
); // 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 © 1996-2025, Sergei Kuchin, email: skuchin@gmail.com, skuchin@gmail.com.
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.