📄 otl4_ex555.htm
字号:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"><html><head> <title>OTL 4.0, Example 555 (STL-compliant OTL/ODBC stream iterators,Sybase SQL Server)</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 555 (STL-compliant OTL/ODBC streamiterators,Sybase SQL Server)</h1><p>This example demonstrates STL-compliant OTL/ODBC stream itertors,std::strings,and ANSI C++ typecasts. </p><h2>Source Code</h2><pre>#include <iostream><br>#include <vector><br>#include <iterator><br>#include <string></pre><pre>#define OTL_ODBC_UNIX // Compile OTL 4.0/ODBC<br>#define OTL_STL // Turn on STL features<br>#define OTL_ANSI_CPP // Turn on ANSI C++ typecasts<br>#include <otlv4.h> // include the OTL 4.0 header file<br><br>using namespace std;<br><br><a href="otl3_connect_class.htm">otl_connect</a> db; // connect object<br><br>// row container class<br>class row{<br>public:<br> int f1;<br> string f2;<br><br>// default constructor<br> row(){f1=0;}<br><br>// destructor<br> ~row(){}<br><br>// copy constructor<br> row(const row& arow)<br> {<br> f1=arow.f1;<br> f2=arow.f2;<br> }<br> <br>// assignment operator<br> row& operator=(const row& arow)<br> {<br> f1=arow.f1;<br> f2=arow.f2;<br> return *this;<br> }<br><br>};<br><br>// redefined operator>> for reading row& from otl_stream<br>otl_stream& operator>>(otl_stream& s, row& arow)<br>{<br> s>>arow.f1>>arow.f2;<br> return s;<br>}<br><br>// redefined operator<< for writing row& into otl_stream<br>otl_stream& operator<<(otl_stream& s, const row& arow)<br>{<br> s<<arow.f1<<arow.f2;<br> return s;<br>}<br><br>// redefined operator<< writing row& into ostream<br>ostream& operator<<(ostream& s, const row& arow)<br>{<br> s<<"f1="<<arow.f1<<", f2="<<arow.f2;<br> return s;<br>}<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<int>,:f2<char[31]>)", <br> // SQL statement<br> db // connect object<br> );<br><br> row r; // single row buffer<br> vector<row> vo; // vector of rows<br><br>// populate the vector<br> for(int i=1;i<=100;++i){<br> r.f1=i;<br> r.f2="NameXXX";<br> vo.push_back(r);<br> }<br><br> cout<<"vo.size="<<vo.size()<<endl;<br><br>// insert vector into table<br> copy(vo.begin(), <br> vo.end(), <br> <a href="otl3_output_iterator.htm">otl_output_iterator</a><row>(o)<br> );<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>=:f1<int> and f1<=:f11<int>*2",<br> // SELECT statement<br> db // connect object<br> ); <br> // create select stream<br> <br> vector<row> v; // vector of rows<br><br>// assigning :f1 = 8, :f11 = 8<br> i<<8<<8;<br><br>// SELECT automatically executes when all input variables are<br>// assigned. First portion of out rows is fetched to the buffer<br><br>// copy all rows to be fetched into the vector<br><br> copy(<a href="otl3_input_iterator.htm">otl_input_iterator</a><row,ptrdiff_t>(i), <br> <a href="otl3_input_iterator.htm">otl_input_iterator</a><row,ptrdiff_t>(),<br> back_inserter(v)); <br><br> cout<<"Size="<<v.size()<<endl;<br><br>// send the vector to cout<br> copy(v.begin(), v.end(), ostream_iterator<row>(cout, "\n"));<br><br>// clean up the vector<br> v.erase(v.begin(),v.end());<br><br> i<<4<<4; // assigning :f1 = 4, :f11 = 4<br> // SELECT automatically executes when all input variables are<br> // assigned. First portion of out rows is fetched to the buffer<br><br>// copy all rows to be fetched to the vector<br> copy(<a href="otl3_input_iterator.htm">otl_input_iterator</a><row,ptrdiff_t>(i), <br> <a href="otl3_input_iterator.htm">otl_input_iterator</a><row,ptrdiff_t>(),<br> back_inserter(v)); <br><br> cout<<"Size="<<v.size()<<endl;<br><br>// send the vector to cout<br> copy(v.begin(), v.end(), ostream_iterator<row>(cout, "\n"));<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@freetds_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><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 ODBC<br><br> return 0;<br><br>}<br></pre><h2>Output</h2><pre>vo.size=100<br>Size=9<br>f1=8, f2=NameXXX<br>f1=9, f2=NameXXX<br>f1=10, f2=NameXXX<br>f1=11, f2=NameXXX<br>f1=12, f2=NameXXX<br>f1=13, f2=NameXXX<br>f1=14, f2=NameXXX<br>f1=15, f2=NameXXX<br>f1=16, f2=NameXXX<br>Size=5<br>f1=4, f2=NameXXX<br>f1=5, f2=NameXXX<br>f1=6, f2=NameXXX<br>f1=7, f2=NameXXX<br>f1=8, f2=NameXXX<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@gmail.com</a>.<script language="JavaScript"><!-- hide from oldgmailsers 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
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -