📄 otl4_ex553.htm
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<title>OTL 4.0, Example 553 (Simple Insert/Select and
otl_stream::clean() function for OTL/ODBC and Sybase SQL Server)</title>
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<h1 align="center">OTL 4.0, Example 553 (Simple Insert/Select and
otl_stream::clean()
function for OTL /ODBC and Sybase SQL Server)</h1>
<p>This example demonstrates simple INSERT, SELECT and the use of the <a
href="otl3_stream_class.htm#clean">otl_stream::clean</a>()
function for OTL/ODBC and Sybase SQL Server..</p>
<h2>Source Code</h2>
<pre>#include <iostream><br>using namespace std;<br><br>#include <stdio.h></pre>
<pre>#define OTL_ODBC_UNIX // Compile OTL 4.0/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(10, // buffer size<br> "insert into test_tab values(:f1<int>,:f2<char[31]>)", <br> // SQL statement<br> db // connect object<br> );<br><br> o.<a
href="otl3_stream_class.htm#set_commit">set_commit</a>(0); // set stream's auto-commit to OFF.<br><br> try{<br> o<<1<<"Line1"; // Enter one row into the stream<br> o.<a
href="otl3_stream_class.htm#flush">flush</a>(); // flush the strem buffer, i.e. force<br> // the stream to execute<br> o<<1<<"Line1"; // Enter the same data into the stream<br> // and cause a "duplicate key" error.<br> o.<a
href="otl3_stream_class.htm#flush">flush</a>();<br> }catch(<a
href="otl3_exception_class.htm">otl_exception</a>& p){<br> if(p.code==2601){<br> // ... duplicate key ...<br> o.<a
href="otl3_stream_class.htm#clean">clean</a>(1); // clean up the stream's buffer<br> // and clean up the stream's internal<br> // error flag as well. By doing this, <br> // it's possible to recover from <br> // a database error without closing<br> // the stream. Remember, the number of <br> // situtation when it's possible is <br> // limited and the recover procedure should<br> // be carefully designed.<br> }else<br> throw; // re-throw the exception to the outer catch block.<br> }<br><br><br> o<<2<<"Line2"; // Enter one more row of data after<br> // recovering from the "duplicate key" <br> // error<br> o.flush();<br><br> db.<a
href="otl3_connect_class.htm#commit">commit</a>(); // commit transaction<br><br>}<br><br>void select()<br>{ <br> <a
href="otl3_stream_class.htm">otl_stream</a> i(10, // buffer size<br> "select * from test_tab",<br> // SELECT statement<br> db // connect object<br> ); <br> // create select stream<br> <br> int f1;<br> char f2[31];<br><br> while(!i.eof()){ // while not end-of-data<br> i>>f1>>f2;<br> cout<<"f1="<<f1<<", f2="<<f2<<endl;<br> }<br><br>}<br><br>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/tigger@freetds_sybsql"); // connect to the database<br>// It's recommended to use auto_commit_off() when OTL is used<br>// with FreeTDS/ODBC against Sybase in order to set the DB<br>// session's auto-commit to OFF. otl_connect::rlogon()'s auto-commit <br>// parameter has not effect. auto_commit_off() is a workaround, until<br>// a fix becomes available.<br> db.auto_commit_off();<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 varchar(30))"<br> ); // create table<br><br> <a
href="otl3_const_sql.htm">otl_cursor::direct_exec<br></a> (<br> db,<br> "create unique index ind001 on test_tab(f1)"<br> ); // create unique index <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.code<<endl; // print out error code<br> cerr<<p.sqlstate<<endl; // print out error SQLSTATE<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>}<br></pre>
<h2>Output</h2>
<pre>f1=1, f2=Line1<br>f1=2, f2=Line2<br><br><hr width="100%"></pre>
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<p>Copyright © 1996, 2008, Sergei Kuchin, email: <a
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<a href="mailto:skuchin@gmail.com">skuchin@gmail.com</a>.
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