📄 otl4_ex223.htm
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<title>OTL 4.0, Example 223 (std::string and TEXTs, MS SQL Server)</title>
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<h1>OTL 4.0, Example 223 (std::string and TEXTs, MS SQL Server)</h1>
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<h1>
Example 223 (std::string and TEXTs, MS SQL Server)</h1>
<h2>
Source Code</h2>
<pre>#include <iostream><br>#include <string><br>using namespace std;</pre>
<pre>#define <a href="otl3_compile.htm#OTL_ODBC_MSSQL_2005">OTL_ODBC_MSSQL_2005</a> // Compile OTL 4/ODBC, MS SQL 2005<br>//#define OTL_ODBC // Compile OTL 4/ODBC. Uncomment this when used with MS SQL 7.0/ 2000<br>#define OTL_STL // Enable STL compatibily mode<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>{</pre>
<pre> string f2; <br> db.<a
href="otl3_connect_class.htm#set_max_long_size">set_max_long_size</a>(70000); // set maximum long string size for connect object<br><br> <a
href="otl3_stream_class.htm">otl_stream</a> o(1, // buffer size has to be set to 1 for operations with LOBs<br> "insert into test_tab values(:f1<int>,:f2<<a
href="otl3_bind_variables.htm#varchar_long">varchar_long</a>>)",<br> // SQL statement<br> db // connect object<br> );<br><br> for(int i=1;i<=20;++i){<br> f2.assign(50001,' '); <br> for(int j=0;j<50000;++j)<br> f2[j]='*';<br> f2[50000]='?';<br> o<<i<<f2;<br> }<br><br>}<br><br>void select()<br>{ <br> string f2;<br> db.<a
href="otl3_connect_class.htm#set_max_long_size">set_max_long_size</a>(70000); // set maximum long string size for connect object<br><br> <a
href="otl3_stream_class.htm">otl_stream</a> i(1, // buffer size needs to be set to 1 for operations with LOBs<br> "select * from test_tab where f1>=:f11<int> and f1<=:f12<int>*2",<br> // SELECT statement<br> db // connect object<br> ); <br> // create select stream<br> <br> float f1;<br><br> i<<8<<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>>f2;<br> cout<<"f1="<<f1<<", f2="<<f2[0]<<f2[f2.length()-1]<<", len="<br> <<f2.length()<<endl;<br> }<br><br> i<<4<<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>>f2;<br> cout<<"f1="<<f1<<", f2="<<f2[0]<<f2[f2.length()-1]<<", len="<br> <<f2.length()<<endl;<br> }<br><br>}<br><br>int main()<br>{<br> <a
href="otl3_connect_class.htm">otl_connect::otl_initialize</a>(); // initialize the database environment<br> try{<br><br> db.rlogon("scott/tiger@mssql"); // connect to teh database<br><br> <a
href="otl3_const_sql.htm">otl_cursor::direct_exec<br></a> (<br> db,<br> "drop table test_tab",<br><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 text)"<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=*?, len=50001<br>f1=9, f2=*?, len=50001<br>f1=10, f2=*?, len=50001<br>f1=11, f2=*?, len=50001<br>f1=12, f2=*?, len=50001<br>f1=13, f2=*?, len=50001<br>f1=14, f2=*?, len=50001<br>f1=15, f2=*?, len=50001<br>f1=16, 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><br><hr
width="100%"></pre>
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