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<title>OTL 4.0, Example 271 (Simple Unicode Insert/Select and
NVARCHAR strings)</title>
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<h1>OTL 4.0, Example 271 (Simple Unicode Insert/Select and NVARCHAR
strings)</h1>
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<h1>
Example 271 (Simple Unicode Insert/Select and NVARCHAR strings)</h1>
This example demonstrates a simple Unicode INSERT, SELECT and constant
SQL statements.<br>
<h2>Source Code</h2>
<pre>#include <iostream><br>using namespace std;<br><br>#include <stdio.h></pre>
<pre>#define OTL_ODBC_MSSQL_2008 // Compile OTL 4/ODBC, MS SQL 2008<br>//#define OTL_ODBC // Compile OTL 4/ODBC. Uncomment this when used with MS SQL 7.0/ 2000<br>#define <a
href="otl3_compile.htm#OTL_UNICODE">OTL_UNICODE</a> // Enable Unicode OTL for ODBC<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<int>,:f2<char[5]>)", <br> // SQL statement, char[5] means 5 2-byte <br> // Unicode charatcters including a null<br> // terminator<br> db // connect object<br> );<br><br> unsigned short tmp[32]; // Null terminated Unicode character array.<br><br> for(int i=1;i<=100;++i){<br> o<<i;<br> tmp[0]=1111; // Unicode character (decimal code of 1111)<br> tmp[1]=2222; // Unicode character (decimal code of 2222)<br> tmp[2]=3333; // Unicode chracater (decimal code of 3333)<br> tmp[3]=4444; // Unicode chracater (decimal code of 4444)<br> tmp[4]=0; // Unicode null terminator <br> o<a
href="otl3_stream_class.htm#unicode_unsigned_char_write"><<</a>(unsigned char*)tmp; <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(50, // buffer size<br> "select * 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> unsigned short f2[32];<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;<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> cout<<"f1="<<f1<<", f2=";<br> for(int j=0;f2[j]!=0;++j)<br> cout<<" "<<f2[j];<br> cout<<endl;<br> }<br><br> i<<4<<4; // assigning :f11 = 4, :f12 = 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>>(unsigned char*)f2;<br> cout<<"f1="<<f1<<", f2=";<br> for(int j=0;f2[j]!=0;++j)<br> cout<<" "<<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 the database API environment<br> try{<br><br> db.rlogon("scott/tiger@mssql2008"); // connect to the database<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 nvarchar(4))"<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 the database<br><br> return 0;<br><br>}</pre>
<h2>
Output</h2>
<pre>f1=8, f2= 1111 2222 3333 4444<br>f1=9, f2= 1111 2222 3333 4444<br>f1=10, f2= 1111 2222 3333 4444<br>f1=11, f2= 1111 2222 3333 4444<br>f1=12, f2= 1111 2222 3333 4444<br>f1=13, f2= 1111 2222 3333 4444<br>f1=14, f2= 1111 2222 3333 4444<br>f1=15, f2= 1111 2222 3333 4444<br>f1=16, f2= 1111 2222 3333 4444<br>f1=4, f2= 1111 2222 3333 4444<br>f1=5, f2= 1111 2222 3333 4444<br>f1=6, f2= 1111 2222 3333 4444<br>f1=7, f2= 1111 2222 3333 4444<br>f1=8, f2= 1111 2222 3333 4444<br><br><br><hr
width="100%"></pre>
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