This example demonstrates how to use OTL/OCI8 classes in the Pro*C/C++ environment (or in any other third-party library, based on OCI8). The assumption is that the primary connection is made in Pro*C/C++ and the OTL connect object gets attached to that primary connection.
#include <iostream> using namespace std; #include <stdio.h> #include <stdio.h> #include <string.h> #include <stdlib.h>
#define OTL_ORA8 // Compile OTL 4.0/OCI8
#define OTL_ORA8_PROC // Indicate that OTL/OCI8 is combined with Pro*C/C++
#include <otlv4.h> // include the OTL 4.0 header file
EXEC SQL INCLUDE SQLCA;
typedef char CSTR[256];
EXEC SQL BEGIN DECLARE SECTION;
EXEC SQL TYPE CSTR IS STRING(256);
CSTR UserId;
EXEC SQL END DECLARE SECTION;
void sqlerror(void)
{
EXEC SQL WHENEVER SQLERROR CONTINUE;
fprintf(stderr,"\n%s\n",sqlca.sqlerrm.sqlerrmc);
EXEC SQL ROLLBACK RELEASE;
exit(1);
}
EXEC SQL WHENEVER SQLERROR DO sqlerror();
otl_connect db; // connect object
void insert()
// insert rows into table
{
otl_stream o(50, // buffer size
"insert into test_tab values(:f1<float>,:f2<char[31]>)",
// SQL statement
db // connect object
);
char tmp[32];
for(int i=1;i<=100;++i){
sprintf(tmp,"Name%d",i);
o<<(float)i<<tmp;
}
}
void select()
{
otl_stream i(50, // buffer size
"select * from test_tab where f1>=:f<int> and f1<=:f*2",
// SELECT statement
db // connect object
);
// create select stream
float f1;
char f2[31];
i<<8; // assigning :f = 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; // assigning :f = 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<<endl;
}
}
int main()
{
OCIEnv* envhp; // OCI environment handle
OCISvcCtx* svchp; // OCI Service context handle
int retcode; // return code
strcpy(UserId,"scott/tiger");
EXEC SQL CONNECT :UserId; // connect to Oracle (primary connection)
// The basic assumption in this example is that the program is single-
// threaded and it makes only one database connection.
// For multi-threaded Pro*C/C++ applications as well as multi-
// connection applications, the format of the SQLEvGet and SQLSvcCtxGet
// functions will be different from the format, used below in the text
// of this program.
retcode=SQLEnvGet(0,&envhp); // get an OCI formatted environment handle
// from the primary connection
if(retcode!=SQL_SUCCESS){
cerr<<"Failed to get the environment handle!!!"<<endl;
return 1;
}
retcode=SQLSvcCtxGet(0,0,-1,&svchp); // get an OCI formatted service
// context handle from the
// primary connection
if(retcode!=SQL_SUCCESS){
cerr<<"Failed to get the service context handle!!!"<<endl;
return 1;
}
otl_connect::otl_initialize(); // initialize OCI environment
try{
db.rlogon(envhp,svchp); // attach to the primary Pro*C/C++ connection
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 varchar2(30))"
); // 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(); // detach from the primary Pro*C/C++ connection
EXEC SQL COMMIT RELEASE;
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.
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