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| author | coreyg <coreyg@13f79535-47bb-0310-9956-ffa450edef68> | 2014-11-21 09:30:19 +0000 |
|---|---|---|
| committer | coreyg <coreyg@13f79535-47bb-0310-9956-ffa450edef68> | 2014-11-21 09:30:19 +0000 |
| commit | 200a40b332420f94992eb39a6d0ea1cf1490ffc4 (patch) | |
| tree | 1c76ef1d254c7bfc91128a313d319bd60da9d01e /site/trunk/site-publish/rdb-das-cpp-foreignkeyrepresentationandmanagement.html | |
| parent | 85f53ab6ab4f664d63774c94b672a875c9e52b8a (diff) | |
Adding tuscany's website to their svn repo for svnpubsub
git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@1640879 13f79535-47bb-0310-9956-ffa450edef68
Diffstat (limited to 'site/trunk/site-publish/rdb-das-cpp-foreignkeyrepresentationandmanagement.html')
| -rw-r--r-- | site/trunk/site-publish/rdb-das-cpp-foreignkeyrepresentationandmanagement.html | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/site/trunk/site-publish/rdb-das-cpp-foreignkeyrepresentationandmanagement.html b/site/trunk/site-publish/rdb-das-cpp-foreignkeyrepresentationandmanagement.html new file mode 100644 index 0000000000..dad32628f2 --- /dev/null +++ b/site/trunk/site-publish/rdb-das-cpp-foreignkeyrepresentationandmanagement.html @@ -0,0 +1,118 @@ + +<!-- + + Licensed to the Apache Software Foundation (ASF) under one or more + contributor license agreements. See the NOTICE file distributed with + this work for additional information regarding copyright ownership. + The ASF licenses this file to You under the Apache License, Version 2.0 + (the "License"); you may not use this file except in compliance with + the License. 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Consider two tables: DEPARTMENT and EMPLOYEE and assume the EMPLOYEE table has a FK column DEPT_ID that references a row in the DEPARTEMENT table.</P> + +<P>If you use the DAS to read a particular department and all of its related employees then you will end up with a DEPARTMENT DataObject that has a property named "EMPLOYEE" that is a reference to a list of related EMPLOYEE DataObjects. You can navigate directly to the employees via this property like this: department->getList("EMPLOYEE").</P> + +<P>As DEPARTMENT PK is stored on the DataObject, a reference to a EMPLOYEE DataObject does not need to store the DEPARTMENT FK, because the DEPARTMENT FK and DEPARTMENT PK should be the same according to <A href="http://en.wikipedia.org/wiki/Referential_integrity" class="external-link" rel="nofollow">Referential Integrity (RI)</A>. So, if a EMPLOYEE is removed from a DEPARTMENT to another, when DAS apply the changes back to the database, it needs only to get the PK value from the new DEPARTENT that references the EMPLOYEE and set it on its DEPARTMENT FK.</P> + </DIV> + </DIV> + </DIV> + <!-- pageContent macro end --> + + </TD> + </TR> + </TABLE> + + <!-- footer macro --> + <SCRIPT src="http://www.google-analytics.com/urchin.js" type="text/javascript"> + </SCRIPT> + <SCRIPT type="text/javascript"> + _uacct = "UA-1174707-5"; + urchinTracker(); + </SCRIPT> + + <A href="http://www.statcounter.com/" target="_blank"><IMG src="http://c26.statcounter.com/counter.php?sc_project=2619156&java=0&security=94bd7e7d&invisible=0" alt="website stats" border="0"></A> + + <DIV class="footer"> + Copyright � 2003-2012, The Apache Software Foundation </BR> + Apache Tuscany and the Apache Tuscany project logo are trademarks of The Apache Software Foundation. + </DIV> + <!-- footer macro end --> + + </BODY> +</HTML> |