1<?xml version="1.0" encoding="UTF-8" standalone="no"?> 2<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 3<html xmlns="http://www.w3.org/1999/xhtml"> 4 <head> 5 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> 6 <title>Exception Handling</title> 7 <link rel="stylesheet" href="gettingStarted.css" type="text/css" /> 8 <meta name="generator" content="DocBook XSL Stylesheets V1.62.4" /> 9 <link rel="home" href="index.html" title="Getting Started with Berkeley DB" /> 10 <link rel="up" href="introduction.html" title="Chapter 1. Introduction to Berkeley DB " /> 11 <link rel="previous" href="databaseLimits.html" title="Database Limits and Portability" /> 12 <link rel="next" href="returns.html" title="Error Returns" /> 13 </head> 14 <body> 15 <div class="navheader"> 16 <table width="100%" summary="Navigation header"> 17 <tr> 18 <th colspan="3" align="center">Exception Handling</th> 19 </tr> 20 <tr> 21 <td width="20%" align="left"><a accesskey="p" href="databaseLimits.html">Prev</a> </td> 22 <th width="60%" align="center">Chapter 1. Introduction to Berkeley DB </th> 23 <td width="20%" align="right"> <a accesskey="n" href="returns.html">Next</a></td> 24 </tr> 25 </table> 26 <hr /> 27 </div> 28 <div class="sect1" lang="en" xml:lang="en"> 29 <div class="titlepage"> 30 <div> 31 <div> 32 <h2 class="title" style="clear: both"><a id="coreExceptions"></a>Exception Handling</h2> 33 </div> 34 </div> 35 <div></div> 36 </div> 37 <p> 38 Before continuing, it is useful to spend a few moments on exception 39 handling in DB with the 40 <span>java</span>. 41 </p> 42 <p> 43 44 <span>Most</span> 45 DB methods throw 46 47 <tt class="classname">DatabaseException</tt> 48 in the event of a serious error. 49 50 51 <span> 52 So your DB code must either catch this exception or declare it 53 to be throwable. Be aware that <tt class="classname">DatabaseException</tt> extends 54 <tt class="classname">java.lang.Exception</tt>. For example: 55 </span> 56 </p> 57 <a id="java_intro1"></a> 58 <pre class="programlisting">import com.sleepycat.db.DatabaseException; 59 60 ... 61try 62{ 63 // DB and other code goes here 64} 65catch(DatabaseException e) 66{ 67 // DB error handling goes here 68} </pre> 69 <p> 70 You can obtain the DB error number for a 71 72 <tt class="classname">DatabaseException</tt> 73 by using 74 75 <span> 76 <tt class="methodname">DatabaseException.getErrno()</tt>. 77 You can also obtain any error message associated with that error 78 using <tt class="methodname">DatabaseException.getMessage()</tt>. 79 </span> 80 </p> 81 </div> 82 <div class="navfooter"> 83 <hr /> 84 <table width="100%" summary="Navigation footer"> 85 <tr> 86 <td width="40%" align="left"><a accesskey="p" href="databaseLimits.html">Prev</a> </td> 87 <td width="20%" align="center"> 88 <a accesskey="u" href="introduction.html">Up</a> 89 </td> 90 <td width="40%" align="right"> <a accesskey="n" href="returns.html">Next</a></td> 91 </tr> 92 <tr> 93 <td width="40%" align="left" valign="top">Database Limits and Portability </td> 94 <td width="20%" align="center"> 95 <a accesskey="h" href="index.html">Home</a> 96 </td> 97 <td width="40%" align="right" valign="top"> Error Returns</td> 98 </tr> 99 </table> 100 </div> 101 </body> 102</html> 103