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<!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 415 (set_transaction_isolation_level, ODBC,Sybase SQL)</title></head><body><center><h1>OTL 4.0, Example 415 (set_transaction_isolation_level, ODBC, SybaseSQL)</h1></center>This example demonstrates the use of otl_connect::<a href="otl3_connect_class.htm#set_transaction_isolation_level">set_transaction_isolation_level</a>()for OTL/ODBC..<h2>Source Code</h2><pre>#include <iostream><br>using namespace std;<br><br>#include <stdio.h></pre><pre>#define OTL_ODBC_UNIX // Compile OTL 4.0/ODBC<br>#include <otlv4.h> // include the OTL 4.0 header file<br><br><a href="otl3_connect_class.htm">otl_connect</a> db1, db2, db3; // connect objects<br><br>void insert()<br>// insert rows into table<br>{ <br> <a href="otl3_stream_class.htm">otl_stream</a> o(50, // buffer size<br> "insert into test_tab values(:f1<float>,:f2<char[31]>)", <br> // SQL statement<br> db1 // connect object<br> );<br> o.set_commit(0); // set stream's auto-commit to OFF<br><br> char tmp[32];<br><br> for(int i=1;i<=100;++i){<br> sprintf(tmp,"Name%d",i);<br> o<<(float)i<<tmp;<br> }<br> o.set_flush();<br> // At this point, rows are posted but not yet committed to the database<br>}<br><br>void select(otl_connect& db)<br>{ <br> <a href="otl3_stream_class.htm">otl_stream</a> i(50, // buffer size<br> "select * from test_tab where f1>=:f<int> and f1<=:ff<int>*2",<br> // SELECT statement<br> db // connect object<br> ); <br> // create select stream<br> <br> float f1;<br> char f2[31];<br><br> i<<4<<4; // assigning :f = 4, :ff = 4<br> // SELECT automatically executes when all input variables are<br> // assigned. First portion of output rows is fetched to the buffer<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 ODBC environment<br> try{<br><br> db1.rlogon("scott/tigger@sybsql"); // connect to ODBC<br> db2.rlogon("scott/tigger@sybsql"); // connect to ODBC<br> db3.rlogon("scott/tigger@sybsql"); // connect to ODBC<br><br> db2.<a href="otl3_connect_class.htm#set_transaction_isolation_level">set_transaction_isolation_level</a>(otl_tran_read_uncommitted);<br> db3.<a href="otl3_connect_class.htm#set_transaction_isolation_level">set_transaction_isolation_level</a>(otl_tran_read_committed);<br><br> <a href="otl3_const_sql.htm">otl_cursor::direct_exec<br></a> (<br> db1,<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> db1,<br> "create table test_tab(f1 int not null, f2 varchar(30), primary key(f1))"<br> ); // create table<br><br> db1.commit(); // committing the DDLs to the database<br> <br> insert(); // insert records into table<br><br> cout<<"=======> Reading uncommitted data..."<<endl; <br> select(db2); // select records from table<br><br> db1.commit(); // committing the inserted rows to the database<br><br> cout<<"=======> Reading committed data..."<<endl; <br> select(db3); // 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.sqlstate<<endl; // print out SQLSTATE message<br> cerr<<p.var_info<<endl; // print out the variable that caused the error<br> }<br><br> db1.logoff(); // disconnect from ODBC<br> db2.logoff(); // disconnect from ODBC<br> db3.logoff(); // disconnect from ODBC<br><br><br> return 0;<br><br>}</pre><h2>Output</h2><pre>=======> Reading uncommitted data...<br>f1=4, f2=Name4<br>f1=5, f2=Name5<br>f1=6, f2=Name6<br>f1=7, f2=Name7<br>f1=8, f2=Name8<br>=======> Reading committed data...<br>f1=4, f2=Name4<br>f1=5, f2=Name5<br>f1=6, f2=Name6<br>f1=7, f2=Name7<br>f1=8, f2=Name8<br><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">GoHome</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<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></a>.</p><p><i>Permission to use, copy, modify and redistribute this documentforany purpose is hereby granted without fee, provided that the abovecopyrightnotice appear in all copies.</i></p></body></html>⌨️ 快捷键说明
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