📄 otl4_ex538.htm
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<title>OTL 4.0, Example 538 (Stream buffer size as int, simple
Insert/Select)</title>
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<h1 align="center">OTL 4.0, Example 538 (Stream buffer size as <span
style="font-style: italic;">int</span>, simple Insert/Select)</h1>
<p>This example demonstrates OTL stream's new <span
style="font-style: italic;">int</span> <a
href="otl3_stream_class.htm#buffer_size">buffer size</a> in a simple
INSERT, SELECT and constant SQL statements.</p>
<h2>Source Code</h2>
<pre>#include <iostream><br>using namespace std;<br><br>#include <stdio.h></pre>
<pre>#define OTL_ODBC_MSSQL_2005 // Compile OTL 4/ODBC, MS SQL 2005<br>#define <a
href="otl3_compile.htm#OTL_FREETDS_ODBC_WORKAROUNDS">OTL_FREETDS_ODBC_WORKAROUNDS</a> // Enable the FreeTDS / ODBC workarounds for MS SQL<br>//#define OTL_ODBC // Compile OTL 4/ODBC. Uncomment this when used with MS SQL 7.0/ 2000<br>//#define OTL_ODBC_UNIX // Compile OTL 4 / ODBC. Uncomment this when used in Linux / Unix<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(20000, // buffer size for SQL 2005 + SP1, <br> // buffer size can be set to 80000 for SQL 2000<br> "insert into test_tab values(:f1<int>,:f2<char[31]>)", <br> // SQL statement<br> db // connect object<br> );<br> char tmp[32];<br><br> for(int i=1;i<=100000;++i){<br> sprintf(tmp,"Name%d",i);<br> o<<i<<tmp;<br> }<br>}<br><br>void select()<br>{ <br> <a
href="otl3_stream_class.htm">otl_stream</a> i(50000, // buffer size<br> "select * from test_tab where f1>=:f11<int> and f1<=:f12<int>",<br> // SELECT statement<br> db // connect object<br> ); <br> // create select stream<br> <br> float f1;<br> char f2[31];<br><br> i<<80000<<80008;<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>>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 the database API environment<br> try{<br><br> db.rlogon("scott/tiger@freetds_mssql"); // 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 varchar(30))"<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>}<br></pre>
<h2>Output</h2>
<pre>f1=80000, f2=Name80000<br>f1=80001, f2=Name80001<br>f1=80002, f2=Name80002<br>f1=80003, f2=Name80003<br>f1=80004, f2=Name80004<br>f1=80005, f2=Name80005<br>f1=80006, f2=Name80006<br>f1=80007, f2=Name80007<br>f1=80008, f2=Name80008<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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