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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>Example 419 (otl_stream::clean(), cleaning the SELECT stream'serror flags, Sybase SQL Serveri)</title></head><body><center><h1>OTL 4.0, Example 419 (otl_stream::clean(), cleaning the SELECTstream'serror flags, Sybase SQL Server)</h1></center>This example demonstrates the extended functionality of the <a href="otl3_stream_class.htm#clean">otl_stream::clean()</a>function.<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> db; // connect object<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> db // connect object<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>}<br><br>void select()<br>{ <br> <a href="otl3_stream_class.htm">otl_stream</a> i(50, // buffer size<br> "select * from test_tab where f1>=convert(int,:f11<char[40]>) "<br> " and f1<=convert(int,:f12<char[40]>)*2",<br> // SELECT statement<br> db // connect object<br> ); <br> // create select stream<br> <br> float f1;<br> char f2[31];<br> <br> try{<br> cout<<"====> Starting a fetch sequence...."<<endl;<br> i<<"xxx8"<<"8"; // assigning :f11 = "xxx8", :f12 = "8", it's obviously <br> // invalid for a numeric column<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> }catch(otl_exception& p){<br> cerr<<"===> A database exception is caught: "<<endl;<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> cerr<<"===> Closing and reopening the stream"<<endl;<br> i.close();<br> i.open(50, // buffer size<br> "select * from test_tab where f1>=convert(int,:f11<char[40]>) "<br> " and f1<=convert(int,:f12<char[40]>)*2",<br> // SELECT statement<br> db // connect object<br> ); <br> }<br><br> cout<<"====> Starting another fetch sequence..."<<endl;<br> i<<"4"<<"4"; // assigning :f11 = 4, :f12 = 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 the environment<br> try{<br><br> db.rlogon("scott/tigger@sybsql"); // connect to the database<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 int, f2 varchar(30))"<br> ); // create table<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 the database<br><br> return 0;<br><br>}</pre><h2>Output<br></h2><pre>====> Starting a fetch sequence....<br>===> A database exception is caught: <br>[Sybase][ODBC Driver][Adaptive Server Enterprise]Syntax error during explicit conversion of CHAR value 'xxx8' to a INT field.<br><br>select * from test_tab where f1>=convert(int,? ) and f1<=convert(int,? )*2<br><br>===> Closing and reopening the stream<br>====> Starting another fetch sequence...<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><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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