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

177
docs/collections/tutorial/transientfieldsinbinding.html Normal file
View File

@@ -0,0 +1,177 @@
<?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>
Using Transient Fields in an Entity Binding
</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="SerializableEntity.html" title="Chapter 6. &#10;&#9;&#9;Using Serializable Entities&#10;&#9;" />
<link rel="next" href="removingredundantvalueclasses.html" title="&#10;&#9;&#9;Removing the Redundant Value Classes&#10;&#9;" />
</head>
<body>
<div class="navheader">
<table width="100%" summary="Navigation header">
<tr>
<th colspan="3" align="center">
Using Transient Fields in an Entity Binding
</th>
</tr>
<tr>
<td width="20%" align="left"><a accesskey="p" href="SerializableEntity.html">Prev</a> </td>
<th width="60%" align="center">Chapter 6. 
Using Serializable Entities
</th>
<td width="20%" align="right"> <a accesskey="n" href="removingredundantvalueclasses.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="transientfieldsinbinding"></a>
Using Transient Fields in an Entity Binding
</h2>
</div>
</div>
<div></div>
</div>
<p>
The entity bindings from the prior example have been changed in
this example to use the entity object both as a value object and an
entity object.
</p>
<p>
Before, the <tt class="methodname">entryToObject()</tt> method combined the
deserialized value object with the key fields to create a new
entity object. Now, this method uses the deserialized object
directly as an entity, and initializes its key using the fields
read from the key tuple.
</p>
<p>
Before, the <tt class="methodname">objectToData()</tt> method constructed a new value
object using information in the entity. Now it simply returns the
entity. Nothing needs to be changed in the entity, since the
transient key fields won't be serialized.
</p>
<a id="sentity_partbinding"></a>
<pre class="programlisting">import com.sleepycat.bind.serial.ClassCatalog;
...
public class SampleViews
{
...
private static class PartBinding extends TupleSerialBinding
{
private PartBinding(ClassCatalog classCatalog, Class dataClass)
{
super(classCatalog, dataClass);
}
public Object entryToObject(TupleInput keyInput, Object dataInput)
{
String number = keyInput.readString();
<b class="userinput"><tt> Part part = (Part) dataInput;
part.setKey(number);
return part;</tt></b>
}
public void objectToKey(Object object, TupleOutput output)
{
Part part = (Part) object;
output.writeString(part.getNumber());
}
public Object objectToData(Object object)
{
<b class="userinput"><tt> return object;</tt></b>
}
}
private static class SupplierBinding extends TupleSerialBinding
{
private SupplierBinding(ClassCatalog classCatalog, Class dataClass)
{
super(classCatalog, dataClass);
}
public Object entryToObject(TupleInput keyInput, Object dataInput)
{
String number = keyInput.readString();
<b class="userinput"><tt> Supplier supplier = (Supplier) dataInput;
supplier.setKey(number);
return supplier;</tt></b>
}
public void objectToKey(Object object, TupleOutput output)
{
Supplier supplier = (Supplier) object;
output.writeString(supplier.getNumber());
}
public Object objectToData(Object object)
{
<b class="userinput"><tt> return object;</tt></b>
}
}
private static class ShipmentBinding extends TupleSerialBinding
{
private ShipmentBinding(ClassCatalog classCatalog, Class dataClass)
{
super(classCatalog, dataClass);
}
public Object entryToObject(TupleInput keyInput, Object dataInput)
{
String partNumber = keyInput.readString();
String supplierNumber = keyInput.readString();
<b class="userinput"><tt> Shipment shipment = (Shipment) dataInput;
shipment.setKey(partNumber, supplierNumber);
return shipment;</tt></b>
}
public void objectToKey(Object object, TupleOutput output)
{
Shipment shipment = (Shipment) object;
output.writeString(shipment.getPartNumber());
output.writeString(shipment.getSupplierNumber());
}
public Object objectToData(Object object)
{
<b class="userinput"><tt> return object;</tt></b>
}
}
} </pre>
</div>
<div class="navfooter">
<hr />
<table width="100%" summary="Navigation footer">
<tr>
<td width="40%" align="left"><a accesskey="p" href="SerializableEntity.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="removingredundantvalueclasses.html">Next</a></td>
</tr>
<tr>
<td width="40%" align="left" valign="top">Chapter 6. 
Using Serializable Entities
 </td>
<td width="20%" align="center">
<a accesskey="h" href="index.html">Home</a>
</td>
<td width="40%" align="right" valign="top"> 
Removing the Redundant Value Classes
</td>
</tr>
</table>
</div>
</body>
</html>