📄 otl3_ex60.htm
字号:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
<HTML>
<HEAD>
<TITLE>OTL 4.0, Example 60 (Using OTL/OCI8: server_attach/detach and session_begin/end)</TITLE>
<META NAME="Author" CONTENT="Sergei Kuchin">
<META NAME="GENERATOR" CONTENT="Mozilla/3.03Gold (Win95; I) [Netscape]">
<META NAME="KeyWords" CONTENT="OTL, Oracle, ODBC, DB2, CLI, database API, C++, Template Library">
</HEAD>
<BODY>
<H1 ALIGN=CENTER>OTL 4.0, Example 60 (Using OTL/OCI8: server_attach/detach
and session_begin/end)</H1>
<H1>Example 60 (Using OTL/OCI8: server_attach/detach and session_begin/end)</H1>
<P>This example demonstrates how to use the following new functions of
the <A HREF="otl3_connect_class.htm">otl_connect</A> class for OTL/OCI8:</P>
<UL>
<LI><A HREF="otl3_connect_class.htm#server_attach">server_attach</A>()</LI>
<LI><A HREF="otl3_connect_class.htm#server_detach">server_detach</A>()</LI>
<LI><A HREF="otl3_connect_class.htm#session_begin">session_begin</A>()</LI>
<LI><A HREF="otl3_connect_class.htm#session_end">session_end</A>()</LI>
</UL>
<H2>Source Code</H2>
<PRE>#include <iostream>
using namespace std;
#include <stdio.h></PRE>
<PRE>#define OTL_ORA8 // Compile OTL 4.0/OCI8
#include <otlv4.h> // include the OTL 4.0 header file
<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<<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()
{
<A HREF="otl3_connect_class.htm">otl_connect::otl_initialize</A>(); // initialize OCI environment
try{
db.rlogon("scott/tiger"); // connect to Oracle
<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
db.<A HREF="otl3_connect_class.htm#logoff">logoff</A>(); // disconnect from Oracle
db.<A HREF="otl3_connect_class.htm#server_attach">server_attach</A>(); // attach to the local Oracle server
// In order to connect to a remote server,
// a TNS alias needs to be specified
for(int i=1;i<=100;++i){
cout<<"Session begin ==> "<<i<<endl;
db.<A HREF="otl3_connect_class.htm#session_begin">session_begin</A>("scott","tiger");
// begin session; this function is much faster
// than rlogon() and should be used (see the Oracle
// manuals for more detail) in high-speed processing
// systems, possibly with thousands of users.
// this technique can be used instead of traditional
// connection pooling.
select(); // select records from table
cout<<"Session end ==> "<<i<<endl;
db.<A HREF="otl3_connect_class.htm#session_end">session_end</A>(); // end session
}
db.<A HREF="otl3_connect_class.htm#server_detach">server_detach</A>(); // detach from the Oracle server
}
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>(); // make sure that the program gets disconnected from Oracle
return 0;
}
</PRE>
<H2>Output<BR>
</H2>
<PRE>Repeated groups of the following lines:
</PRE>
<PRE>Session begin ==> XXX
f1=4, f2=Name4
f1=5, f2=Name5
f1=6, f2=Name6
f1=7, f2=Name7
f1=8, f2=Name8
Session end ==> XXX
<HR WIDTH="100%"></PRE>
<CENTER><P><A HREF="otl3_examples.htm">Examples</A> <A HREF="otl3.htm">Contents</A>
<A HREF="home.htm">Go Home</A> </P></CENTER>
<P>Copyright © 1996, 2008, Sergei Kuchin, email: <A HREF="mailto:skuchin@aceweb.com">skuchin@aceweb.com</A>,
<A HREF="mailto:skuchin@gmail.com">skuchin@gmail.com</A> <SCRIPT Language="JavaScript"><!-- hide from oldgmailsers
var modDate = new Date(document.lastModified)
document.write("<i> Last Updated:</i> " + (modDate.getMonth()+1) + "/" +
modDate.getDate() + "/" + "0"+(modDate.getYear())%100+".");
//-->
</SCRIPT>.</P>
<P><I>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. </I></P>
</BODY>
</HTML>
⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -