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<title>OTL 4.0, Example 285 (Simple Unicode Insert/Select for both
VARCHAR2 and NVARCHAR2 at the same time)</title>
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<h1>OTL 4.0, Example 285 (Simple Unicode Insert/Select for both
VARCHAR2 and NVARCHAR2 at the same time)</h1>
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<h1>
Example 285 (Simple Unicode Insert/Select for both VARCHAR2 and
NVARCHAR2 at the same time)</h1>
This example demonstrates a simple Unicode INSERT, SELECT for both
VARCHAR and NVARCHAR2 at the same time.
<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 OTL_ORA9I // Compile OTL 4.0/OCI9i<br>//#define OTL_ORA10G // Compile OTL 4.0/OCI10g<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 "<br> "values(:f1<<a
href="otl3_bind_variables.htm#int">int</a>>,:f2<<a
href="otl3_bind_variables.htm#char">char</a>[31]>,:f3<<a
href="otl3_bind_variables.htm#nchar">nchar</a>[31]>)", <br> // SQL statement<br> db // connect object<br> );<br> char tmp[32];<br> unsigned short tmp2[31]; // 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<<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> o<a
href="otl3_stream_class.htm#unicode_unsigned_char_write"><<</a>(unsigned char*)tmp2; <br> }<br><br>}<br><br>void select()<br>{ <br> <a
href="otl3_stream_class.htm">otl_stream</a> i(50, // buffer size<br> "select "<br> " f1, f2, "<br> " f3 :#3<<a
href="otl3_bind_variables.htm#nchar">nchar</a>[31]> " <br> // override the default mapping of f3 (from char[]) <br> // to nchar[]<br> "from test_tab "<br> "where f1>=:f<int> "<br> " and f1<=:f*2",<br> // SELECT statement<br> db // connect object<br> ); <br> // create select stream<br> <br> int f1;<br> unsigned short f2[31];<br> unsigned short f3[31];<br><br> i<<4; // assigning :f = 4<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;<br> i<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> i<a
href="otl3_stream_class.htm#unicode_unsigned_read">>></a>(unsigned char*)f3;<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<<", f3=";<br> for(int j2=0;f3[j2]!=0;++j2){<br> cout<<(char)f2[j2];<br> }<br> cout<<endl;<br> }<br><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 varchar2(60), f3 nvarchar2(60))"<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>}</pre>
<h2>
Output</h2>
<pre>f1=4, f2=Name4, f3=Name4<br>f1=5, f2=Name5, f3=Name5<br>f1=6, f2=Name6, f3=Name6<br>f1=7, f2=Name7, f3=Name7<br>f1=8, f2=Name8, f3=Name8<br><br><hr
width="100%"></pre>
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