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<TITLE>OTL 4.0, Example 59 (Using OTL/OCI8 in Pro*C/C++ )</TITLE>
<META NAME="Author" CONTENT="Sergei Kuchin">
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<H1 ALIGN=CENTER>OTL 4.0, Example 59 (Using OTL/OCI8 in Pro*C/C++ environment)</H1>
<H1><A NAME="example1"></A>Example 59 (Using OTL/OCI8 in Pro*C/C++ environment)</H1>
<P>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.</P>
<H2>Source Code</H2>
<PRE>#include <iostream>
using namespace std;
#include <stdio.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h></PRE>
<PRE>#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
<FONT COLOR="#008000">EXEC SQL INCLUDE SQLCA</FONT>;
typedef char CSTR[256];
<FONT COLOR="#008000">EXEC SQL BEGIN DECLARE SECTION</FONT>;
<FONT COLOR="#008000">EXEC SQL TYPE CSTR IS STRING(256)</FONT>;
CSTR UserId;
<FONT COLOR="#008000">EXEC SQL END DECLARE SECTION</FONT>;
void sqlerror(void)
{
<FONT COLOR="#008000">EXEC SQL WHENEVER SQLERROR CONTINUE</FONT>;
fprintf(stderr,"\n%s\n",sqlca.sqlerrm.sqlerrmc);
<FONT COLOR="#008000">EXEC SQL ROLLBACK RELEASE</FONT>;
exit(1);
}
<FONT COLOR="#008000">EXEC SQL WHENEVER SQLERROR DO sqlerror()</FONT>;
<A HREF="otl3_connect_class.htm">otl_connect</A> db; // connect object
void insert()
// insert rows into table
{
<A HREF="otl3_stream_class.htm">otl_stream</A> 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()
{
<A HREF="otl3_stream_class.htm">otl_stream</A> 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");
<FONT COLOR="#008000">EXEC SQL CONNECT :UserId</FONT>; // connect to Oracle (primary connection)
</PRE>
<PRE>// 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;
}
<A HREF="otl3_connect_class.htm">otl_connect::otl_initialize</A>(); // initialize OCI environment
try{
db.<A HREF="otl3_connect_class.htm#attach8">rlogon</A>(envhp,svchp); // attach to the primary Pro*C/C++ connection
<A HREF="otl3_const_sql.htm">otl_cursor::direct_exec
</A> (
db,
"drop table test_tab",
otl_exception::disabled // disable OTL exceptions
); // drop table
<A HREF="otl3_const_sql.htm">otl_cursor::direct_exec
</A> (
db,
"create table test_tab(f1 number, f2 varchar2(30))"
); // create table
insert(); // insert records into table
select(); // select records from table
}
catch(<A HREF="otl3_exception_class.htm">otl_exception</A>& 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.<A HREF="otl3_connect_class.htm#logoff">logoff</A>(); // detach from the primary Pro*C/C++ connection
<FONT COLOR="#008000">EXEC SQL COMMIT RELEASE</FONT>;
return 0;
}
</PRE>
<H2>Output</H2>
<PRE>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
<HR WIDTH="100%"></PRE>
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<P>Copyright © 1996, 2008, Sergei Kuchin, email: <A HREF="mailto:skuchin@aceweb.com">skuchin@aceweb.com</A>,
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