📄 otl4_ex664.htm
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<title>OTL 4.0, Example 664 (XMLType as CLOB/otl_long_string on
SELECT, and varchar_long/otl_long_string on INSERT)</title>
<meta name="Author" content="Sergei Kuchin">
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<h1 align="center">OTL 4.0, Example 664 (XMLType as
CLOB/otl_long_string on SELECT, and as varchar_long/otl_long_string</h1>
<h1 align="center"> on INSERT)</h1>
<p>This example demonstrates simple INSERT and SELECT statements with
the XMLType datatype as well as constant SQL statements. XMLType
columns can be bound with varchar_long variables on
INSERT/UPDATE/DELETE, on
SELECT, XMLType needs to be converted into CLOB.<br>
</p>
<h2>Source Code</h2>
<pre>#include <iostream><br>using namespace std;<br><br>#include <stdio.h></pre>
<pre>#define OTL_ORA9I // Compile OTL 4.0/OCI9I<br>//#define OTL_ORA10G // Compile OTL 4.0/OCI10g<br>//#define OTL_ORA10G_R2 // Compile OTL 4.0/OCI10gR2<br>//#define OTL_ORA11G // Compile OTL 4.0/OCI11G<br>#define <a
href="otl3_compile.htm#OTL_ORA_UTF8">OTL_ORA_UTF8</a> // Enable UTF8 OTL for OCI9i<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> db.<a href="otl3_connect_class.htm#set_max_long_size">set_max_long_size</a>(80000); // set maximum long string size for connect object<br> <a
href="otl3_stream_class.htm">otl_stream</a> o(1, // buffer size needs to be set to 1 when varchar_long is used<br> "insert into test_tab values(:f1<int>,:f2<varchar_long>) ",<br> // SQL statement<br> db // connect object<br> );<br> char tmp[80001];<br><br> for(int i=1;i<=20;++i){<br> sprintf(tmp,"<TAG>MyXML%d</TAG>",i);<br> int len=(int)strlen(tmp);<br> <a
href="otl3_long_string.htm">otl_long_string</a> f2(tmp,len,len); // define long string variable<br> o<<i<<f2;<br> }<br><br>}<br><br>void select()<br>{ <br> <a
href="otl3_long_string.htm">otl_long_string</a> f2(80000); // define long string variable<br> db.<a
href="otl3_connect_class.htm#set_max_long_size">set_max_long_size</a>(80000); // set maximum long string size for connect object<br><br> <a
href="otl3_stream_class.htm">otl_stream</a> i(10, // buffer size. To read XML as CLOBs, it can be set to a size greater than 1<br> "select f1, to_clob(f2) "<br> "from test_tab "<br> "where f1>=:f11<int> "<br> " and f1<=:f12<int>*2",<br> // SELECT statement<br> db // connect object<br> ); <br> // create select stream<br> <br> int f1;<br><br> i<<8<<8; // assigning :f11 = 8, :f12 = 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="<<(char*)&f2[0]<<endl;<br> }<br><br>}<br><br>int main()<br>{<br> putenv(const_cast<char*>("NLS_LANG=.AL32UTF8")); // set your Oracle Client NLS_LANG <br> // if its default was set to something else<br> <a
href="otl3_connect_class.htm">otl_connect::otl_initialize</a>(); // initialize OCI environment<br> try{<br><br> db.rlogon("scott/tiger"); // connect to Oracle<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 number, f2 xmltype)"<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 Oracle<br><br> return 0;<br><br>}<br></pre>
<h2>Output</h2>
<pre>f1=8, f2=<TAG>MyXML8</TAG><br>f1=9, f2=<TAG>MyXML9</TAG><br>f1=10, f2=<TAG>MyXML10</TAG><br>f1=11, f2=<TAG>MyXML11</TAG><br>f1=12, f2=<TAG>MyXML12</TAG><br>f1=13, f2=<TAG>MyXML13</TAG><br>f1=14, f2=<TAG>MyXML14</TAG><br>f1=15, f2=<TAG>MyXML15</TAG><br>f1=16, f2=<TAG>MyXML16</TAG><br><hr
width="100%"></pre>
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<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>
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