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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"><html><head> <title>OTL 4.0, Example 584 (Simple Insert/Select with VARBINARY andotl_stream_read-iterator)</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 584 (Simple Insert/Select withVARBINARY and otl_stream_read_iterator)</h1><p>This example demonstrates simple INSERT and SELECT statements withthe VARBINARY datatype as well as constant SQL statements.</p><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>#define OTL_STREAM_READ_ITERATOR_ON<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>{ </pre><pre> <a href="otl3_long_string.htm">otl_long_string</a> f2(200); // define long string variable<br> <a href="otl3_stream_class.htm">otl_stream</a> o(10, // buffer size<br> "insert into test_tab values(:f1<int>,:f2<<a href="otl3_bind_variables.htm#raw">raw</a>[700]>)",<br> // SQL statement<br> db // connect object<br> );<br><br> for(int i=1;i<=20;++i){<br> for(int j=0;j<199;++j)<br> f2[j]='*';<br> f2[199]='?';<br> f2.<a href="otl3_long_string.htm#set_len">set_len</a>(200);<br> o<<i<<f2;<br> }<br><br>}<br><br>void select()<br>{ <br> <a href="otl3_long_string.htm">otl_long_string</a> f2(700); // define long string variable<br> <a href="otl3_stream_class.htm">otl_stream</a> i(10, // buffer size<br> "select * from test_tab where f1>=:f11<int> and f1<=:f12<int>*2",<br> // SELECT statement<br> db // connect object<br> ); <br> // create select stream<br> <br> int f1;<br> <a href="otl4_stream_read_iterator.htm">otl_stream_read_iterator</a><<a href="otl3_stream_class.htm">otl_stream</a>,<a href="otl3_exception_class.htm">otl_exception</a>,<a href="otl3_lob_stream.htm">otl_lob_stream</a>> rs;<br><br> i<<8<<8; // assigning :f11 = 8, :f12 = 8<br> rs.<a href="otl4_stream_read_iterator.htm#attach">attach</a>(i); // attach the iterator "rs" to the stream "i".<br> // SELECT automatically executes when all input variables are<br> // assigned. First portion of output rows is fetched to the buffer<br><br> while(rs.<a href="otl4_stream_read_iterator.htm#next_row">next_row</a>()){ // while not end-of-data<br> rs.<a href="otl4_stream_read_iterator.htm#get_functions">get</a>(1,f1);<br> rs.<a href="otl4/otl4_stream_read_iterator.htm#get_functions">get</a>(2,f2);<br> cout<<"f1="<<f1<<", f2="<<f2[0]<<f2[f2.<a href="otl3_long_string.htm#len">len</a>()-1]<<", len="<<f2.<a href="otl3_long_string.htm#len">len</a>()<<endl;<br> }<br><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(rs.<a href="otl4_stream_read_iterator.htm#next_row">next_row</a>()){ // while not end-of-data<br> rs.<a href="otl4_stream_read_iterator.htm#get_functions">get</a>(1,f1);<br> rs.<a href="otl4_stream_read_iterator.htm#get_functions">get</a>(2,f2);<br> cout<<"f1="<<f1<<", f2="<<f2[0]<<f2[f2.<a href="otl3_long_string.htm#len">len</a>()-1]<<", len="<<f2.<a href="otl3_long_string.htm#len">len</a>()<<endl;<br> }<br><br> rs.<a href="otl4_stream_read_iterator.htm#detach">detach</a>(); // detach the itertor from the stream<br><br>}<br><br>int main()<br>{<br> <a href="otl3_connect_class.htm">otl_connect::otl_initialize</a>(); // initialize the database API environment<br> try{<br><br> db.rlogon("scott/tigger@freetds_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 varbinary(255))"<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.sqlstate<<endl; // print out SQLSTATE <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>}<br></pre><h2>Output</h2><pre>f1=8, f2=*?, len=200<br>f1=9, f2=*?, len=200<br>f1=10, f2=*?, len=200<br>f1=11, f2=*?, len=200<br>f1=12, f2=*?, len=200<br>f1=13, f2=*?, len=200<br>f1=14, f2=*?, len=200<br>f1=15, f2=*?, len=200<br>f1=16, f2=*?, len=200<br>f1=4, f2=*?, len=200<br>f1=5, f2=*?, len=200<br>f1=6, f2=*?, len=200<br>f1=7, f2=*?, len=200<br>f1=8, f2=*?, len=200<br><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@yahogmail</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 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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