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<title>OTL 4.0, Example 674 (XML as varchar_long/wstring on SELECT,
and varchar_long/wstring on INSERT)</title>
<meta name="Author" content="Sergei Kuchin">
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<h1 align="center">OTL 4.0, Example 674 (XML as
varchar_long/wstring on
SELECT, and varchar_long/wstring on INSERT)</h1>
<p>This example demonstrates simple INSERT and SELECT statements with
the XML datatype as well as constant SQL statements. XMLType
columns can be bound with varchar_long variables on
INSERT/UPDATE/DELETE. On
SELECT, XML gets bound to varchar_long by default.<br>
</p>
<h2>Source Code</h2>
<pre>#include <iostream><br>#include <string><br>using namespace std;<br><br>#include <stdio.h><br>#define <a
href="otl3_compile.htm#OTL_ODBC_MSSQL_2005">OTL_DB2_CLI</a> // Compile OTL 4/DB2 CLI<br>#define <a
href="otl3_compile.htm#OTL_UNICODE">OTL_UNICODE</a> // Enable Unicode OTL for ODBC<br><br>#if defined(__GNUC__)<br><br>namespace std{<br> typedef unsigned short unicode_char;<br> typedef basic_string<unicode_char> unicode_string;<br>}<br><br>#define <a
href="otl3_compile.htm#OTL_UNICODE_CHAR_TYPE">OTL_UNICODE_CHAR_TYPE</a> unicode_char<br>#define <a
href="otl3_compile.htm#OTL_UNICODE_STRING_TYPE">OTL_UNICODE_STRING_TYPE</a> unicode_string<br><br>#else<br><br>#define <a
href="otl3_compile.htm#OTL_UNICODE_CHAR_TYPE">OTL_UNICODE_CHAR_TYPE</a> wchar_t<br>#define <a
href="otl3_compile.htm#OTL_UNICODE_STRING_TYPE">OTL_UNICODE_STRING_TYPE</a> wstring<br>#endif<br><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>{ <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> <a
href="otl3_stream_class.htm">otl_stream</a> o(10, // buffer size<br> "insert into test_tab values(:f1<int>,:f2<varchar_long>) ",<br> // SQL statement<br> db // connect object<br> );<br>OTL_UNICODE_CHAR_TYPE tmp[80001]; // Null terminated Unicode character array.<br><br> for(int i=1;i<=20;++i){<br> tmp[0]='<';<br> tmp[1]='T';<br> tmp[2]='A';<br> tmp[3]='G';<br> tmp[4]='>';<br> tmp[5]=1111; // Unicode character (decimal code of 1111) <br> tmp[6]=2222; // Unicode character (decimal code of 2222)<br> tmp[7]=3333; // Unicode character (decimal code of 3333) <br> tmp[8]=4444; // Unicode character (decimal code of 4444) <br> tmp[9]='<';<br> tmp[10]='/';<br> tmp[11]='T';<br> tmp[12]='A';<br> tmp[13]='G';<br> tmp[14]='>';<br> tmp[15]=0;<br> OTL_UNICODE_STRING_TYPE tmp_str(tmp);<br> o<<i<<tmp_str;<br> }<br><br>}<br><br>void select()<br>{ <br> OTL_UNICODE_STRING_TYPE f2;<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<br> "select f1, 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=";<br> for(size_t j=0;j<f2.length();++j)<br> if(f2[j]<128)<br> cout<<(char)f2[j];<br> else<br> cout<<(int)f2[j]<<" ";<br> cout<<endl;<br> }<br><br>}<br><br>int main()<br>{<br> <a
href="otl3_connect_class.htm">otl_connect::otl_initialize</a>(); // initialize DB2 CLI environment<br> try{<br><br> db.rlogon("scott/tiger@db2sql"); // connect to DB2<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 xml)"<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 MS SQL<br><br> return 0;<br><br>}<br></pre>
<h2>Output</h2>
<pre>f1=8, f2=65279 <?xml version="1.0" encoding="UTF-16" ?><TAG>1111 2222 3333 4444 </TAG><br>f1=9, f2=65279 <?xml version="1.0" encoding="UTF-16" ?><TAG>1111 2222 3333 4444 </TAG><br>f1=10, f2=65279 <?xml version="1.0" encoding="UTF-16" ?><TAG>1111 2222 3333 4444 </TAG<br>f1=11, f2=65279 <?xml version="1.0" encoding="UTF-16" ?><TAG>1111 2222 3333 4444 </TAG<br>f1=12, f2=65279 <?xml version="1.0" encoding="UTF-16" ?><TAG>1111 2222 3333 4444 </TAG<br>f1=13, f2=65279 <?xml version="1.0" encoding="UTF-16" ?><TAG>1111 2222 3333 4444 </TAG<br>f1=14, f2=65279 <?xml version="1.0" encoding="UTF-16" ?><TAG>1111 2222 3333 4444 </TAG<br>f1=15, f2=65279 <?xml version="1.0" encoding="UTF-16" ?><TAG>1111 2222 3333 4444 </TAG<br>f1=16, f2=65279 <?xml version="1.0" encoding="UTF-16" ?><TAG>1111 2222 3333 4444 </TAG<br><hr
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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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