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  <title>OTL 4.0, Example 237</title>
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<h1>OTL 4.0, Example 237 (OTL/ODBC, accessing the system data
dictionary via
ODBC functions, MS SQL Server)</h1>
</center>
This example demonstrates how to access the database system data
dictionary
via ODBC functions, OTL/ODBC, MS SQL Server. In theory, any ODBC driver
that implements the necessary ODBC functions can be used with OTL/ODBC.
<h2>Source Code</h2>
<pre>#include &lt;iostream&gt;<br>using namespace std;<br><br>#include &lt;stdio.h&gt;</pre>
<pre>#define <a href="otl3_compile.htm#OTL_ODBC_MSSQL_2008">OTL_ODBC_MSSQL_2008</a> // 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>#include &lt;otlv4.h&gt; // include the OTL 4.0 header file<br><br><a
 href="otl3_connect_class.htm">otl_connect</a> db; // connect object<br><br><br>void select()<br>{&nbsp;<br>&nbsp;<a
 href="otl3_stream_class.htm">otl_stream</a> s;<br><br>&nbsp;s.set_all_column_types(otl_all_num2str|otl_all_date2str);&nbsp;<br>&nbsp;&nbsp;&nbsp; // map all numeric and date/time output columns to strings for simplicity.<br><br>&nbsp;s.open(100, // buffer size<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "$SQLTables",<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // get a list of all tables in the current database<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; db // connect object<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; );&nbsp;<br><br>&nbsp;otl_column_desc* desc;<br>&nbsp;int desc_len;<br>&nbsp;desc=s.describe_select(desc_len);&nbsp;<br>&nbsp;&nbsp;&nbsp; // describe the structure of the output columns of the result set.<br><br>&nbsp;int rpc=0;<br>&nbsp;while(!s.eof()){<br>&nbsp;&nbsp; ++rpc;<br>&nbsp;&nbsp; char str[512];<br>&nbsp;&nbsp; cout&lt;&lt;"ROW#"&lt;&lt;rpc&lt;&lt;" ";<br>&nbsp;&nbsp; for(int col_num=0;col_num&lt;desc_len;++col_num){<br>&nbsp;&nbsp;&nbsp;&nbsp; s&gt;&gt;str;<br>&nbsp;&nbsp;&nbsp;&nbsp; if(s.is_null())<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; cout&lt;&lt;desc[col_num].name&lt;&lt;"=NULL ";<br>&nbsp;&nbsp;&nbsp;&nbsp; else<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; cout&lt;&lt;desc[col_num].name&lt;&lt;"="&lt;&lt;str&lt;&lt;" ";<br>&nbsp;&nbsp; }<br>&nbsp;&nbsp; cout&lt;&lt;endl;<br>&nbsp;}<br><br>}<br><br>int main()<br>{<br>&nbsp;<a
 href="otl3_connect_class.htm">otl_connect::otl_initialize</a>(); // initialize ODBC environment<br>&nbsp;try{<br><br>&nbsp; db.rlogon("scott/tiger@mssql2008"); // connect to ODBC<br><br>&nbsp; select(); // query the system data dictionary via ODBC functions.<br><br>&nbsp;}<br><br>&nbsp;catch(<a
 href="otl3_exception_class.htm">otl_exception</a>&amp; p){ // intercept OTL exceptions<br>&nbsp; cerr&lt;&lt;p.msg&lt;&lt;endl; // print out error message<br>&nbsp; cerr&lt;&lt;p.stm_text&lt;&lt;endl; // print out SQL that caused the error<br>&nbsp; cerr&lt;&lt;p.sqlstate&lt;&lt;endl; // print out SQLSTATE message<br>&nbsp; cerr&lt;&lt;p.var_info&lt;&lt;endl; // print out the variable that caused the error<br>&nbsp;}<br><br>&nbsp;db.logoff(); // disconnect from ODBC<br><br>&nbsp;return 0;<br><br>}</pre>
<h2>
Output</h2>
<pre>ROW#1 TABLE_CAT=DMS TABLE_SCHEM=dbo TABLE_NAME=syscolumns TABLE_TYPE=SYSTEM TABLE REMARKS=NULL&nbsp;<br>ROW#2 TABLE_CAT=DMS TABLE_SCHEM=dbo TABLE_NAME=syscomments TABLE_TYPE=SYSTEM TABLE REMARKS=NULL&nbsp;<br>ROW#3 TABLE_CAT=DMS TABLE_SCHEM=dbo TABLE_NAME=sysdepends TABLE_TYPE=SYSTEM TABLE REMARKS=NULL&nbsp;<br>ROW#4 TABLE_CAT=DMS TABLE_SCHEM=dbo TABLE_NAME=sysfilegroups TABLE_TYPE=SYSTEM TABLE REMARKS=NULL&nbsp;<br>ROW#5 TABLE_CAT=DMS TABLE_SCHEM=dbo TABLE_NAME=sysfiles TABLE_TYPE=SYSTEM TABLE REMARKS=NULL&nbsp;<br>ROW#6 TABLE_CAT=DMS TABLE_SCHEM=dbo TABLE_NAME=sysfiles1 TABLE_TYPE=SYSTEM TABLE REMARKS=NULL&nbsp;<br>ROW#7 TABLE_CAT=DMS TABLE_SCHEM=dbo TABLE_NAME=sysforeignkeys TABLE_TYPE=SYSTEM TABLE REMARKS=NULL&nbsp;<br>ROW#8 TABLE_CAT=DMS TABLE_SCHEM=dbo TABLE_NAME=sysfulltextcatalogs TABLE_TYPE=SYSTEM TABLE REMARKS=NULL&nbsp;<br>ROW#9 TABLE_CAT=DMS TABLE_SCHEM=dbo TABLE_NAME=sysfulltextnotify TABLE_TYPE=SYSTEM TABLE REMARKS=NULL&nbsp;<br>ROW#10 TABLE_CAT=DMS TABLE_SCHEM=dbo TABLE_NAME=sysindexes TABLE_TYPE=SYSTEM TABLE REMARKS=NULL&nbsp;<br>ROW#11 TABLE_CAT=DMS TABLE_SCHEM=dbo TABLE_NAME=sysindexkeys TABLE_TYPE=SYSTEM TABLE REMARKS=NULL&nbsp;<br>ROW#12 TABLE_CAT=DMS TABLE_SCHEM=dbo TABLE_NAME=sysmembers TABLE_TYPE=SYSTEM TABLE REMARKS=NULL&nbsp;<br>ROW#13 TABLE_CAT=DMS TABLE_SCHEM=dbo TABLE_NAME=sysobjects TABLE_TYPE=SYSTEM TABLE REMARKS=NULL&nbsp;<br>ROW#14 TABLE_CAT=DMS TABLE_SCHEM=dbo TABLE_NAME=syspermissions TABLE_TYPE=SYSTEM TABLE REMARKS=NULL&nbsp;<br>ROW#15 TABLE_CAT=DMS TABLE_SCHEM=dbo TABLE_NAME=sysproperties TABLE_TYPE=SYSTEM TABLE REMARKS=NULL&nbsp;<br>ROW#16 TABLE_CAT=DMS TABLE_SCHEM=dbo TABLE_NAME=sysprotects TABLE_TYPE=SYSTEM TABLE REMARKS=NULL&nbsp;<br>ROW#17 TABLE_CAT=DMS TABLE_SCHEM=dbo TABLE_NAME=sysreferences TABLE_TYPE=SYSTEM TABLE REMARKS=NULL&nbsp;<br>ROW#18 TABLE_CAT=DMS TABLE_SCHEM=dbo TABLE_NAME=systypes TABLE_TYPE=SYSTEM TABLE REMARKS=NULL&nbsp;<br>ROW#19 TABLE_CAT=DMS TABLE_SCHEM=dbo TABLE_NAME=sysusers TABLE_TYPE=SYSTEM TABLE REMARKS=NULL&nbsp;<br>ROW#20 TABLE_CAT=DMS TABLE_SCHEM=dbo TABLE_NAME=dtproperties TABLE_TYPE=TABLE REMARKS=NULL&nbsp;<br>ROW#21 TABLE_CAT=DMS TABLE_SCHEM=dbo TABLE_NAME=dual TABLE_TYPE=TABLE REMARKS=NULL&nbsp;<br>ROW#22 TABLE_CAT=DMS TABLE_SCHEM=dbo TABLE_NAME=t1 TABLE_TYPE=TABLE REMARKS=NULL&nbsp;<br>ROW#23 TABLE_CAT=DMS TABLE_SCHEM=dbo TABLE_NAME=t2 TABLE_TYPE=TABLE REMARKS=NULL&nbsp;<br>ROW#24 TABLE_CAT=DMS TABLE_SCHEM=dbo TABLE_NAME=test_tab TABLE_TYPE=TABLE REMARKS=NULL&nbsp;<br>ROW#25 TABLE_CAT=DMS TABLE_SCHEM=dbo TABLE_NAME=test_tab2 TABLE_TYPE=TABLE REMARKS=NULL&nbsp;<br>ROW#26 TABLE_CAT=DMS TABLE_SCHEM=dbo TABLE_NAME=sysconstraints TABLE_TYPE=VIEW REMARKS=NULL&nbsp;<br>ROW#27 TABLE_CAT=DMS TABLE_SCHEM=dbo TABLE_NAME=syssegments TABLE_TYPE=VIEW REMARKS=NULL&nbsp;<br>ROW#28 TABLE_CAT=DMS TABLE_SCHEM=dbo TABLE_NAME=vw1 TABLE_TYPE=VIEW REMARKS=NULL&nbsp;<br><br><hr
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<p>Copyright &copy; 1996, 2008, Sergei Kuchin, email: <a
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