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<title>OTL 4.0, Example 240</title>
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<h1> OTL 4.0, Example 239 (OTL/ODBC, accessing the system data
dictionary via ODBC functions, MS SQL Server)</h1>
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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 <iostream><br>#include <stdio.h><br>using namespace std;<br><br>#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 <otlv4.h> // include the OTL 4.0 header file<br><pre><br><a
href="otl3_connect_class.htm">otl_connect</a> db; // connect object<br><br><br>void select()<br>{ <br> <a
href="otl3_stream_class.htm">otl_stream</a> s;<br><br> s.set_all_column_types(otl_all_num2str|otl_all_date2str); <br> // map all numeric and date/time output columns to strings for simplicity.<br><br> s.open(100, // buffer size<br> "<tt>$SQLColumns $1:'dms' $2:'dbo' $3:'test_tab'</tt>",<br> // get a list of all columns of table <br> // "test_tab" that belongs to schema "dbo", <br> // catalog "DMS"<br> db // connect object<br> ); <br><br> otl_column_desc* desc;<br> int desc_len;<br> desc=s.describe_select(desc_len); <br> // describe the structure of the output columns of the result set.<br><br> int rpc=0;<br> while(!s.eof()){<br> ++rpc;<br> char str[512];<br> cout<<"ROW#"<<rpc<<" ";<br> for(int col_num=0;col_num<desc_len;++col_num){<br> s>>str;<br> if(s.is_null())<br> cout<<desc[col_num].name<<"=NULL ";<br> else<br> cout<<desc[col_num].name<<"="<<str<<" ";<br> }<br> cout<<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/tiger@mssql2008"); // connect to ODBC<br><br> select(); // query the system data dictionary via ODBC functions.<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>ROW#1 TABLE_CAT=dms TABLE_SCHEM=dbo TABLE_NAME=test_tab COLUMN_NAME=f1 DATA_TYPE=4 TYPE_NAME=int COLUMN_SIZE=10 BUFFER_LENGTH=4 DECIMAL_DIGITS=0 NUM_PREC_RADIX=10 NULLABLE=1 REMARKS=NULL COLUMN_DEF=NULL SQL_DATA_TYPE=4 SQL_DATETIME_SUB=NULL CHAR_OCTET_LENGTH=NULL ORDINAL_POSITION=1 IS_NULLABLE=YES SS_DATA_TYPE=38 <br>ROW#2 TABLE_CAT=dms TABLE_SCHEM=dbo TABLE_NAME=test_tab COLUMN_NAME=f2 DATA_TYPE=12 TYPE_NAME=varchar COLUMN_SIZE=30 BUFFER_LENGTH=30 DECIMAL_DIGITS=NULL NUM_PREC_RADIX=NULL NULLABLE=1 REMARKS=NULL COLUMN_DEF=NULL SQL_DATA_TYPE=12 SQL_DATETIME_SUB=NULL CHAR_OCTET_LENGTH=30 ORDINAL_POSITION=2 IS_NULLABLE=YES SS_DATA_TYPE=39 <br><br><hr
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