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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"><HTML><HEAD> <TITLE>OTL 4.0, Example 47 (Auto-commit every SQL statement / commit-on-success mode in Oracle 8)</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 47 ("<B>Auto-commit every SQL statement/ commit-on-success" mode in Oracle 8</B>)</H1><H1><A NAME="example1"></A>Example 47 ("<B>Auto-commit every SQL statement/ commit-on-success" mode in Oracle 8</B>)</H1><P>This example demonstrates the traditional auto-commit mode that is usuallyset at the level of the database connection. In other words, when the modeis set, every execution of a SQL statement is followed by the automaticcommit. This auto-commit has nothing to do with the otl_stream auto-commit.</P><P>Oracle does not recommend to use this mode because "it is not flexible."Anyway, here goes the example:</P><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 for the first connection which will be // set to "auto-commit"<A HREF="otl3_connect_class.htm">otl_connect</A> db2; // connect object for the second connection which will be // used for selecting "auto-commited" rowsvoid insert()// insert rows into table{ // otl_nocommit_stream is more logical to use in this case because transactions// commit anyway. <A HREF="otl3_stream_class.htm#nocommit">otl_nocommit_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>=:f1<int> and f1<=:f2<int>*2", // SELECT statement db2 // connect object ); // create select stream float f1; char f2[31]; i<<8<<8; // assigning :f1 = 8, :f2 = 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<<4; // assigning :f1 = 4, :f2 = 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.<A HREF="otl3_connect_class.htm#rlogon">rlogon</A>("scott/tiger",1); // connect to Oracle in the auto-commit mode. db2.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 int, f2 varchar(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.logoff(); // disconnect from Oracle db2.logoff(); // disconnect from Oracle return 0;}</PRE><H2>Output</H2><PRE>f1=8, f2=Name8f1=9, f2=Name9f1=10, f2=Name10f1=11, f2=Name11f1=12, f2=Name12f1=13, f2=Name13f1=14, f2=Name14f1=15, f2=Name15f1=16, f2=Name16f1=4, f2=Name4f1=5, f2=Name5f1=6, f2=Name6f1=7, f2=Name7f1=8, f2=Name8<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 forany purpose is hereby granted without fee, provided that the above copyrightnotice appear in all copies. </I></P></BODY></HTML>⌨️ 快捷键说明
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