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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"><html><head> <title>OTL 4.0, Example 400 (Sybase SQL Server:otl_stream::describe_select() and result sets)</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 400<br>(Sybase SQL Server: otl_stream::describe_select() and result sets)</h1><p>This example demonstrates the <a href="otl3_stream_class.htm#describe_select">otl_stream::describe_select</a>()with a stored procedure call returning a result set.</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>#include <otlv4.h> // include the OTL 4.0 header file<br><br><a href="otl3_connect_class.htm">otl_connect</a> db; // connect object</pre><pre>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> "{call my_proc(:f1<int>)}", // SELECT statement via stored procedure<br> db, // connect object<br> <a href="otl3_stream_class.htm#implicit_select">otl_implicit_select</a> // implicit SELECT statement<br> ); <br> // create select stream<br> <br> <a href="otl3_stream_class.htm#otl_column_desc">otl_column_desc</a>* desc;<br> int desc_len;<br><br> i<<4; // Before the child SELECT statement can be described,<br> // the stored procedure needs to be executed.<br> // Forcing the execution of the stored procedure by entering its input <br> // patameter.<br><br> desc=i.<a href="otl3_stream_class.htm#describe_select">describe_select</a>(desc_len);<br><br> for(int n=0;n<desc_len;++n){<br> cout<<"========== COLUMN #"<<n+1<<" ==========="<<endl;<br> cout<<"name="<<desc[n].name<<endl;<br> cout<<"dbtype="<<desc[n].dbtype<<endl;<br> cout<<"<a href="otl3_stream_class.htm#otl_var_dbtype">otl_var_dbtype</a>="<<desc[n].otl_var_dbtype<<endl;<br> cout<<"dbsize="<<desc[n].dbsize<<endl;<br> cout<<"scale="<<desc[n].scale<<endl;<br> cout<<"prec="<<desc[n].prec<<endl;<br> cout<<"nullok="<<desc[n].nullok<<endl;<br> }<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> db.rlogon("scott/tigger@sybsql"); // connect to ODBC<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> otl_cursor::direct_exec(db,"drop procedure my_proc",0);<br> otl_cursor::direct_exec<br> (<br> db,<br> "CREATE PROCEDURE my_proc "<br> " @F1 int "<br> "AS "<br> "SELECT * FROM test_tab "<br> "WHERE f1>=@F1 AND f1<=@F1*2 "<br> ); // create stored procedure<br><br> insert(); // insert record 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.sqlstate<<endl; // print out SQLSTATE message<br> cerr<<p.var_info<<endl; // print out the variable that caused the error<br> }<br><br> db.logoff(); // disconnect from ODBC<br><br> return 0;<br><br>}<br></pre><h2>Output</h2><pre>========== COLUMN #1 ===========<br>name=f1<br>dbtype=4<br>otl_var_dbtype=4<br>dbsize=10<br>scale=0<br>prec=10<br>nullok=1<br>========== COLUMN #2 ===========<br>name=f2<br>dbtype=12<br>otl_var_dbtype=1<br>dbsize=60<br>scale=0<br>prec=60<br>nullok=1<br></pre><pre><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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