📄 otl3_ex232.htm
字号:
<!DOCTYPE html PUBLIC "-//w3c//dtd html 4.0 transitional//en">
<html>
<head>
<meta http-equiv="Content-Type"
content="text/html; charset=iso-8859-1">
<meta name="Author" content="Sergei Kuchin">
<meta name="GENERATOR"
content="Mozilla/4.77 [en] (Win95; U) [Netscape]">
<meta name="KeyWords"
content="OTL, Oracle, ODBC, DB2, CLI, database API, C++, Template Library">
<title>OTL 4.0, Example 232 (otl_stream::flush() and duplicate rows,
Oracle 8,8i,9i)</title>
</head>
<body>
<center>
<h1>OTL 4.0, Example 232 (otl_stream::flush() and duplicate rows,
Oracle 8,8i,9i)</h1>
</center>
<h1>
Example 232 (otl_stream::flush() and duplicate rows, Oracle 8,8i,9i)</h1>
This example demonstrates a simple INSERT, SELECT and the use of the <a
href="otl3_stream_class.htm#flush">otl_stream::flush</a>()
function with two parameters for Oracle 8/8i/9i.
<h2>Source Code</h2>
<pre>#include <iostream><br>using namespace std;<br><br>#include <stdio.h></pre>
<pre>//#define OTL_ORA8I // Compile OTL 4.0/OCI8<br>#define OTL_ORA8I // Compile OTL 4.0/OCI8i<br>// #define OTL_ORA9I // Compile OTL 4.0/OCI9i<br>#include <otlv4.h> // include the OTL 4.0 header file<br><br><a
href="otl3_connect_class.htm">otl_connect</a> db; // connect object<br><br>void insert()<br>// insert rows into table<br>{ <br> <a
href="otl3_stream_class.htm">otl_stream</a> o(10, // make the buffer size larger than the actual <br> // row set to inserted, so that the stream will not<br> // flush the buffer automatically<br> "insert into test_tab values(:f1<int>,:f2<char[31]>)", <br> // SQL statement<br> db // connect object<br> );<br><br> o.<a
href="otl3_stream_class.htm#set_commit">set_commit</a>(0); // set stream's auto-commit to OFF.<br><br> long total_rpc=0; // total "rows processed count"<br> long rpc=0; // rows successfully processed in one flush() call<br> int iters=0; // number of rows to be bypassed<br><br> try{<br> o<<1<<"Line1"; // Enter one row into the stream<br> o<<1<<"Line1"; // Enter the same data into the stream<br> // and cause a "duplicate key" error.<br> o<<2<<"Line2"; // Enter one row into the stream<br> o<<3<<"Line3"; // Enter one row into the stream<br> o<<4<<"Line4"; // Enter one row into the stream<br> o<<4<<"Line4"; // Enter the same data into the stream<br> // and cause a "duplicate key" error.<br> o.<a
href="otl3_stream_class.htm#flush">flush</a>();<br> }catch(<a
href="otl3_exception_class.htm">otl_exception</a>& p){<br> if(p.code==1){<br> // ORA-0001: ...duplicate key...<br> ++iters;<br> rpc=o.<a
href="otl3_stream_class.htm#get_rpc">get_rpc</a>();<br> total_rpc=rpc;<br> do{<br> try{<br> cout<<"TOTAL_RPC="<<total_rpc<<", RPC="<<rpc<<endl;<br> o.<a
href="otl3_stream_class.htm#flush">flush</a>(total_rpc+iters, // bypass the duplicate row and start<br> // with the rows after that<br> true // force buffer flushing regardless<br> );<br> rpc=0;<br> }catch(otl_exception& p2){<br> if(p2.code==1){<br> // ORA-0001: ... duplicate key ...<br> ++iters;<br> rpc=o.<a
href="otl3_stream_class.htm#get_rpc">get_rpc</a>();<br> total_rpc+=rpc;<br> }else<br> throw;<br> }<br> }while(rpc>0);<br> }else<br> throw; // re-throw the exception to the outer catch block.<br> }<br><br> db.<a
href="otl3_connect_class.htm#commit">commit</a>(); // commit transaction<br><br>}<br><br>void select()<br>{ <br> <a
href="otl3_stream_class.htm">otl_stream</a> i(10, // buffer size<br> "select * from test_tab",<br> // SELECT statement<br> db // connect object<br> ); <br> // create select stream<br> <br> int f1;<br> char f2[31];<br><br> while(!i.eof()){ // while not end-of-data<br> i>>f1>>f2;<br> cout<<"f1="<<f1<<", f2="<<f2<<endl;<br> }<br><br>}<br><br>int main()<br>{<br> <a
href="otl3_connect_class.htm">otl_connect::otl_initialize</a>(); // initialize OCI environment<br> try{<br><br> db.rlogon("scott/tiger"); // connect to Oracle<br><br> <a
href="otl3_const_sql.htm">otl_cursor::direct_exec<br></a> (<br> db,<br> "drop table test_tab",<br> otl_exception::disabled // disable OTL exceptions<br> ); // drop table<br><br> <a
href="otl3_const_sql.htm">otl_cursor::direct_exec<br></a> (<br> db,<br> "create table test_tab(f1 number, f2 varchar2(30))"<br> ); // create table<br><br> <a
href="otl3_const_sql.htm">otl_cursor::direct_exec<br></a> (<br> db,<br> "create unique index ind001 on test_tab(f1)"<br> ); // create unique index <br><br> insert(); // insert records into table<br> select(); // select records from table<br><br> }<br><br> catch(<a
href="otl3_exception_class.htm">otl_exception</a>& p){ // intercept OTL exceptions<br> cerr<<p.msg<<endl; // print out error message<br> cerr<<p.stm_text<<endl; // print out SQL that caused the error<br> cerr<<p.var_info<<endl; // print out the variable that caused the error<br> }<br><br> db.logoff(); // disconnect from Oracle<br><br> return 0;<br><br>}</pre>
<h2>
Output</h2>
<pre>TOTAL_RPC=1, RPC=1<br>TOTAL_RPC=4, RPC=3<br>f1=1, f2=Line1<br>f1=2, f2=Line2<br>f1=3, f2=Line3<br>f1=4, f2=Line4<br><br><br><hr
width="100%"></pre>
<center><a href="otl3_examples.htm">Examples</a> <a href="otl3.htm">Contents</a><a
href="home.htm">Go
Home</a></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 old browsers
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 + -