📄 otl4_ex426.htm
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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 426 (std::string and TEXTs, Sybase SQL Server)</title></head><body><center><h1>OTL 4.0, Example 426 (std::string and TEXTs, Sybase SQL Server)</h1></center><h2>Source Code</h2><pre>#include <iostream><br>#include <string><br>using namespace std;</pre><pre>#define OTL_ODBC_UNIX // Compile OTL 4.0/ODBC<br>#define OTL_STL // Enable STL compatibily mode<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> string f2; <br> db.<a href="otl3_connect_class.htm#set_max_long_size">set_max_long_size</a>(7000); // set maximum long string size for connect object<br><br> <a href="otl3_stream_class.htm">otl_stream</a> o(1, // buffer size has to be set to 1 for operations with LOBs<br> "insert into test_tab values(:f1<int>,:f2<<a href="otl3_bind_variables.htm#varchar_long">varchar_long</a>>)",<br> // SQL statement<br> db // connect object<br> );<br><br> for(int i=1;i<=20;++i){<br> f2.assign(5001,' '); <br> for(int j=0;j<5000;++j)<br> f2[j]='*';<br> f2[5000]='?';<br> o<<i<<f2;<br> }<br><br>}<br><br>void select()<br>{ <br> string f2;<br> db.<a href="otl3_connect_class.htm#set_max_long_size">set_max_long_size</a>(7000); // set maximum long string size for connect object<br><br> <a href="otl3_stream_class.htm">otl_stream</a> i(1, // buffer size needs to be set to 1 for operations with LOBs<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> float f1;<br><br> i<<8<<8;<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[0]<<f2[f2.length()-1]<<", len="<br> <<f2.length()<<endl;<br> }<br><br> i<<4<<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[0]<<f2[f2.length()-1]<<", len="<br> <<f2.length()<<endl;<br> }<br><br>}<br><br>int main()<br>{<br> <a href="otl3_connect_class.htm">otl_connect::otl_initialize</a>(); // initialize the database 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><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 text)"<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</h2><pre>f1=8, f2=*?, len=5001<br>f1=9, f2=*?, len=5001<br>f1=10, f2=*?, len=5001<br>f1=11, f2=*?, len=5001<br>f1=12, f2=*?, len=5001<br>f1=13, f2=*?, len=5001<br>f1=14, f2=*?, len=5001<br>f1=15, f2=*?, len=5001<br>f1=16, f2=*?, len=5001<br>f1=4, f2=*?, len=5001<br>f1=5, f2=*?, len=5001<br>f1=6, f2=*?, len=5001<br>f1=7, f2=*?, len=5001<br>f1=8, f2=*?, len=5001<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</a>.<script language="Javgmailpt"><!-- 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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