📄 otl4_ex326.htm
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<title>OTL 4.0, Example 326 (otl_long_string container and a LONG
BYTE column)</title>
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<h1>OTL 4.0, Example 326 (otl_long_string container and a LONG BYTE
column)</h1>
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<h1>
Example 326 (otl_long_string container and a LONG VARCHAR column)</h1>
This example demonstrates simple INSERT/SELECT with otl_long_string
container
and a LONG BYTE column.
<h2>Source Code</h2>
<pre>#include <iostream><br>using namespace std;<br><br>#include <stdio.h></pre>
<pre>#define <a href="otl3_compile.htm#OTL_ODBC">OTL_ODBC</a> // Compile OTL 4.0/ODBC<br>// #define OTL_ODBC_UNIX // uncomment this line if UnixODBC is used<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(void)<br>// insert rows into table<br>{ <br><br> <a
href="otl3_long_string.htm">otl_long_string</a> f2(7000); // define long string variable<br> db.<a
href="otl3_connect_class.htm#set_max_long_size">set_max_long_size</a>(7000); // set maximum long string size for connect object<br><br> <a
href="otl3_stream_class.htm">otl_stream</a> o(1, // buffer size needs to be set to 1<br> "insert into test_tab values(:f1<int>,:f2<<a
href="otl3_bind_variables.htm#varchar_long">varchar_long</a>>)", <br> // INSERT statement<br> db // connect object<br> );<br><br><br> for(int i=1;i<=10;++i){<br> for(int j=0;j<5000;++j)<br> f2[j]='*';<br> f2[5000]='?';<br> f2.<a
href="otl3_long_string.htm#set_len">set_len</a>(5001);<br> o<<i<<f2;<br> }<br>}<br><br>void select(void)<br>{ <br> otl_long_string f2(7000); // define long string variable<br> db.set_max_long_size(7000); // set maximum long string size for connect object<br><br> otl_stream i(1, // buffer size needs to be set to 1 in case of TEXT columns<br> "select * from test_tab",<br> // SELECT statement<br> db // connect object<br> ); <br> // create select stream<br> <br> int f1;<br><br><br> while(!i.eof()){ // while not end-of-data<br> i>>f1>>f2;<br> cout<<"f1="<<f1<<", f2="<<f2[0]<<f2[f2.len()-1]<<", len="<<f2.len()<<endl;<br> }<br><br>}</pre>
<pre>int main()<br>{<br> <a href="otl3_connect_class.htm">otl_connect::otl_initialize</a>(); // initialize ODBC environment<br> try{<br><br> db.rlogon("scott/tiger@sapdbsql");<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 long varchar)"<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.sqlstate<<endl; // print out SQLSTATE message<br> cerr<<p.var_info<<endl; // print out the variable that caused the error<br> }<br><br> db.logoff(); // disconnect from ODBC<br><br> return 0;<br><br>}</pre>
<h2>
Output</h2>
<pre>f1=1, f2=*?, len=50001<br>f1=2, f2=*?, len=50001<br>f1=3, f2=*?, len=50001<br>f1=4, f2=*?, len=50001<br>f1=5, f2=*?, len=50001<br>f1=6, f2=*?, len=50001<br>f1=7, f2=*?, len=50001<br>f1=8, f2=*?, len=50001<br>f1=9, f2=*?, len=50001<br>f1=10, f2=*?, len=50001<br><br><hr
width="100%"></pre>
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