ag/cpython-source-deps
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Import BSDDB 4.7.25 (as of svn r89086)

Browse Source
This commit is contained in:
Zachary Ware
2017-09-04 13:40:25 -05:00
parent 4b29e0458f
commit 8f590873d0
4781 changed files with 2241032 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

130
docs/collections/tutorial/removingredundantvalueclasses.html Normal file
View File

@@ -0,0 +1,130 @@
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>
Removing the Redundant Value Classes
</title>
<link rel="stylesheet" href="gettingStarted.css" type="text/css" />
<meta name="generator" content="DocBook XSL Stylesheets V1.62.4" />
<link rel="home" href="index.html" title="Berkeley DB Collections Tutorial" />
<link rel="up" href="SerializableEntity.html" title="Chapter 6. &#10;&#9;&#9;Using Serializable Entities&#10;&#9;" />
<link rel="previous" href="transientfieldsinbinding.html" title="&#10;&#9;&#9;Using Transient Fields in an Entity Binding&#10;&#9;" />
<link rel="next" href="Summary.html" title="Chapter 7. &#10;&#9;&#9;Summary&#10;&#9;" />
</head>
<body>
<div class="navheader">
<table width="100%" summary="Navigation header">
<tr>
<th colspan="3" align="center">
Removing the Redundant Value Classes
</th>
</tr>
<tr>
<td width="20%" align="left"><a accesskey="p" href="transientfieldsinbinding.html">Prev</a> </td>
<th width="60%" align="center">Chapter 6. 
Using Serializable Entities
</th>
<td width="20%" align="right"> <a accesskey="n" href="Summary.html">Next</a></td>
</tr>
</table>
<hr />
</div>
<div class="sect1" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h2 class="title" style="clear: both"><a id="removingredundantvalueclasses"></a>
Removing the Redundant Value Classes
</h2>
</div>
</div>
<div></div>
</div>
<p>
The <tt class="classname">PartData</tt>, <tt class="classname">SupplierData</tt> and <tt class="classname">ShipmentData</tt>
classes have been removed in this example, and the <tt class="classname">Part</tt>,
<tt class="classname">Supplier</tt> and <tt class="classname">Shipment</tt> entity classes are used in
their place.
</p>
<p>
The serial formats are created with the entity classes.
</p>
<a id="sentity_sampledatabase"></a>
<pre class="programlisting">public class SampleDatabase
{
...
public SampleDatabase(String homeDirectory)
throws DatabaseException, FileNotFoundException
{
...
secConfig.setKeyCreator(new SupplierByCityKeyCreator(javaCatalog,
<b class="userinput"><tt>Supplier</tt></b>.class));
...
secConfig.setKeyCreator(new ShipmentByPartKeyCreator(javaCatalog,
<b class="userinput"><tt>Shipment</tt></b>.class));
...
secConfig.setKeyCreator(new ShipmentBySupplierKeyCreator(javaCatalog,
<b class="userinput"><tt>Shipment</tt></b>.class));
...
}
} </pre>
<p>
The index key creator uses the entity class as well.
</p>
<a id="sentity_supplierbycitykeycreator"></a>
<pre class="programlisting">public class SampleDatabase
{
...
private static class SupplierByCityKeyCreator
extends TupleSerialKeyCreator
{
private SupplierByCityKeyCreator(ClassCatalog catalog,
Class valueClass)
{
super(catalog, valueClass);
}
public boolean createSecondaryKey(TupleInput primaryKeyInput,
Object valueInput,
TupleOutput indexKeyOutput)
{
<b class="userinput"><tt>Supplier</tt></b> supplier = (<b class="userinput"><tt>Supplier</tt></b>) valueInput;
String city = supplier.getCity();
if (city != null) {
indexKeyOutput.writeString(supplier.getCity());
return true;
} else {
return false;
}
}
}
} </pre>
</div>
<div class="navfooter">
<hr />
<table width="100%" summary="Navigation footer">
<tr>
<td width="40%" align="left"><a accesskey="p" href="transientfieldsinbinding.html">Prev</a> </td>
<td width="20%" align="center">
<a accesskey="u" href="SerializableEntity.html">Up</a>
</td>
<td width="40%" align="right"> <a accesskey="n" href="Summary.html">Next</a></td>
</tr>
<tr>
<td width="40%" align="left" valign="top">
Using Transient Fields in an Entity Binding
 </td>
<td width="20%" align="center">
<a accesskey="h" href="index.html">Home</a>
</td>
<td width="40%" align="right" valign="top"> Chapter 7. 
Summary
</td>
</tr>
</table>
</div>
</body>
</html>