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<title>OTL 4.0, Example 185 (Unicode, NVARCHAR2 and otl_refcur_stream)</title>
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<h1>OTL 4.0, Example 185 (Unicode, NVARCHAR2 and otl_refcur_stream)</h1>
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<h1>
Example 185 (Unicode, NVARCHAR2 and otl_refcur_stream)</h1>
<h2>
Source Code</h2>
<pre>#include <iostream><br>using namespace std;<br><br>#include <stdio.h></pre>
<pre>#define OTL_ORA8I // Compile OTL 4.0/OCI8i<br>#define <a
href="otl3_compile.htm#OTL_UNICODE">OTL_UNICODE</a> // Enable Unicode OTL for OCI8i<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> <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> unsigned short tmp2[32]; // Null terminated Unicode character array.<br><br> for(int i=1;i<=100;++i){<br> sprintf(tmp,"Name%d",i);<br> unsigned short* c2=tmp2;<br> char* c1=tmp;<br>// Unicode's first 128 characters are ASCII (0..127), so<br>// all is needed for converting ASCII into Unicode is as follows:<br> while(*c1){<br> *c2=(unsigned char)*c1;<br> ++c1; ++c2; <br> } <br> *c2=0; // target Unicode string is null terminated,<br> // only the null terminator is a two-byte character, <br> // not one-byte<br> o<<(float)i;<br> o<a
href="otl3_stream_class.htm#unicode_unsigned_char_write"><<</a>(unsigned char*)tmp2; <br> // overloaded operator<<(const unsigned char*) in the case of Unicode<br> // OTL accepts a pointer to a Unicode character array.<br> // operator<<(const unsigned short*) wasn't overloaded<br> // in order to avoid ambiguity in C++ type casting.<br> }<br><br>}<br><br>void select()<br>{ <br> <a
href="otl3_stream_class.htm">otl_stream</a> i(1, // buffer size<br> "begin "<br> " open <b>:cur<refcur,out[50]> </b>for "<br> // :cur is a bind variable name, refcur -- its type, <br> // out -- output parameter, 50 -- the buffer size when this<br> // reference cursor will be attached to <a
href="otl4_refcur_stream.htm">otl_refcur_stream<br></a> " select * "<br> " from test_tab "<br> " where f1>=:f<int,in> and f1<=:f*2; "<br> "end;", // PL/SQL block returns a referenced cursor<br> db // connect object<br> ); <br> // create select stream with referenced cursor<br><br> i.set_commit(0); // set stream "auto-commit" to OFF.<br> <br> float f1;<br> unsigned short f2[32];<br><br> <a
href="otl4_refcur_stream.htm">otl_refcur_stream</a> s; // reference cursor stream for reading rows.<br><br> i<<8; // assigning :f = 8<br> i<a
href="otl3_stream_class.htm#stream_read_refcur">>></a>s; // initializing the refrence cursor stream with the output <br> // reference cursor.<br><br> while(!s.eof()){ // while not end-of-data<br> s>>f1;<br> s<a
href="otl3_stream_class.htm#unicode_unsigned_read">>></a>(unsigned char*)f2;<br> // overloaded operator>>(unsigned char*) in the case of Unicode<br> // OTL accepts a pointer to a Unicode chracter array.<br> // operator>>(unsigned short*) wasn't overloaded <br> // in order to avoid ambiguity in C++ type casting.<br> cout<<"f1="<<f1<<", f2=";<br>// Unicode's first 128 characters are ASCII, so in order<br>// to convert Unicode back to ASCII all is needed is<br>// as follows:<br> for(int j=0;f2[j]!=0;++j){<br> cout<<(char)f2[j];<br> }<br> cout<<endl;<br> }<br><br> s.close(); // closing the reference cursor<br><br> i<<4; // assigning :f = 4<br> i>>s;<br><br> while(!s.eof()){ // while not end-of-data<br> s>>f1;<br> s<a
href="otl3_stream_class.htm#unicode_unsigned_read">>></a>(unsigned char*)f2;<br> // overloaded operator>>(unsigned char*) in the case of Unicode<br> // OTL accepts a pointer to a Unicode chracter array.<br> // operator>>(unsigned short*) wasn't overloaded <br> // in order to avoid ambiguity in C++ type casting.<br> cout<<"f1="<<f1<<", f2=";<br>// Unicode's first 128 characters are ASCII, so in order<br>// to convert Unicode back to ASCII all is needed is<br>// as follows:<br> for(int j=0;f2[j]!=0;++j){<br> cout<<(char)f2[j];<br> }<br> cout<<endl;<br> }<br><br> // there is no need to explicitly calls s.close() since s's destructor <br> // will take care of closing the stream<br>}<br><br>int main()<br>{<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 nvarchar2(60))"<br> ); // create table<br><br> db.<a
href="otl3_connect_class.htm#set_character_set">set_character_set</a>(SQLCS_NCHAR);<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>}</pre>
<h2>
Output</h2>
<pre>f1=8, f2=Name8<br>f1=9, f2=Name9<br>f1=10, f2=Name10<br>f1=11, f2=Name11<br>f1=12, f2=Name12<br>f1=13, f2=Name13<br>f1=14, f2=Name14<br>f1=15, f2=Name15<br>f1=16, f2=Name16<br>f1=4, f2=Name4<br>f1=5, f2=Name5<br>f1=6, f2=Name6<br>f1=7, f2=Name7<br>f1=8, f2=Name8<br><br><br><hr
width="100%"></pre>
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