📄 otl3_ex08.htm
字号:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"><HTML><HEAD> <TITLE>OTL 4.0, Example 8 (otl_stream::describe_select() with a referenved cursor)</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 8<BR>(otl_stream::describe_select() with a referenced cursor)</H1><H1><A NAME="example1"></A>Example 8 (otl_stream::describe_select() witha referenced cursor)</H1><P>This example demonstrates the <A HREF="otl3_stream_class.htm#describe_select">otl_stream::describe_select</A>()with a referenced cursor..</P><H2>Source Code</H2><PRE>#include <iostream>using namespace std;#include <stdio.h></PRE><PRE>#define OTL_ORA7 // Compile OTL 4.0/OCI7#include <otlv4.h> // include the OTL 4.0 header file<A HREF="otl3_connect_class.htm">otl_connect</A> db; // connect object</PRE><PRE>void insert()// insert rows into table{ <A HREF="otl3_stream_class.htm">otl_stream</A> o(50, // buffer size "insert into test_tab values(:f1<float>,:f2<char[31]>)", // SQL statement db // connect object ); char tmp[32]; for(int i=1;i<=100;++i){ sprintf(tmp,"Name%d",i); o<<(float)i<<tmp; }}void select(){ <A HREF="otl3_stream_class.htm">otl_stream</A> i(50, // buffer size "begin " " open <B>:cur1</B> for " " select * from test_tab " " where f1>=:f<int> and f1<=:f*2; " "end;", // SELECT statement via referenced cursor db, // connect object ":cur1" // referenced cursor placeholder name ); // create select stream <A HREF="otl3_stream_class.htm#otl_column_desc">otl_column_desc</A>* desc; int desc_len; i<<4; // Before the child SELECT statement can be described, // the PL/SQL master block needs to be executed. // Forcing the execution of the blcok by entering its input // patameter. desc=i.<A HREF="otl3_stream_class.htm#describe_select">describe_select</A>(desc_len); for(int n=0;n<desc_len;++n){ cout<<"========== COLUMN #"<<n+1<<" ==========="<<endl; cout<<"name="<<desc[n].name<<endl; cout<<"dbtype="<<desc[n].dbtype<<endl; cout<<"<A HREF="otl3_stream_class.htm#otl_var_dbtype">otl_var_dbtype</A>="<<desc[n].otl_var_dbtype<<endl; cout<<"dbsize="<<desc[n].dbsize<<endl; cout<<"scale="<<desc[n].scale<<endl; cout<<"prec="<<desc[n].prec<<endl; cout<<"nullok="<<desc[n].nullok<<endl; } }int main(){ <A HREF="otl3_connect_class.htm">otl_connect::otl_initialize</A>(); // initialize OCI environment try{ db.rlogon("scott/tiger"); // connect to Oracle <A HREF="otl3_const_sql.htm">otl_cursor::direct_exec</A> ( db, "drop table test_tab", otl_exception::disabled // disable OTL exceptions ); // drop table <A HREF="otl3_const_sql.htm">otl_cursor::direct_exec</A> ( db, "create table test_tab(f1 number, f2 varchar2(30))" ); // create table insert(); // insert record into table select(); // select records from table } catch(<A HREF="otl3_exception_class.htm">otl_exception</A>& p){ // intercept OTL exceptions cerr<<p.msg<<endl; // print out error message cerr<<p.stm_text<<endl; // print out SQL that caused the error cerr<<p.var_info<<endl; // print out the variable that caused the error } db.logoff(); // disconnect from Oracle return 0;}</PRE><H2>Output</H2><PRE>========== COLUMN #1 ===========name=F1dbtype=2otl_var_dbtype=2dbsize=22scale=0prec=0nullok=1========== COLUMN #2 ===========name=F2dbtype=1otl_var_dbtype=1dbsize=30scale=0prec=0nullok=1<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 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 document forany purpose is hereby granted without fee, provided that the above copyrightnotice appear in all copies. </I></P><script type="text/javascript">var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));</script><script type="text/javascript">var pageTracker = _gat._getTracker("UA-5456201-1");pageTracker._trackPageview();</script></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 + -