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apache / logging-chainsaw-site / 59eecba28b2da66d6231bfc90f0c8985837f2c95 / . / 2.1.0 / apidocs / org / apache / log4j / db / DBAppender.html
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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">org.apache.log4j.db</a></div>
<h2 title="Class DBAppender" class="title">Class DBAppender</h2>
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<li>org.apache.log4j.AppenderSkeleton</li>
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<li>org.apache.log4j.db.DBAppender</li>
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<dt>All Implemented Interfaces:</dt>
<dd><code>org.apache.log4j.Appender</code>, <code>org.apache.log4j.spi.OptionHandler</code>, <code>org.apache.log4j.xml.UnrecognizedElementHandler</code></dd>
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<hr>
<pre>public class <span class="typeNameLabel">DBAppender</span>
extends org.apache.log4j.AppenderSkeleton
implements org.apache.log4j.xml.UnrecognizedElementHandler</pre>
<div class="block">The DBAppender inserts loggin events into three database tables in a format
independent of the Java programming language. The three tables that
DBAppender inserts to must exists before DBAppender can be used. These tables
may be created with the help of SQL scripts found in the
<em>src/java/org/apache/log4j/db/dialect</em> directory. There is a
specific script for each of the most popular database systems. If the script
for your particular type of database system is missing, it should be quite
easy to write one, taking example on the already existing scripts. If you
send them to us, we will gladly include missing scripts in future releases.
<p>
<p>
If the JDBC driver you are using supports the
<a href="https://docs.oracle.com/javase/8/docs/api/java/sql/Statement.html?is-external=true#getGeneratedKeys()" title="class or interface in java.sql" class="externalLink"><code>Statement.getGeneratedKeys()</code></a>method introduced in JDBC 3.0
specification, then you are all set. Otherwise, there must be an
<a href="dialect/SQLDialect.html" title="interface in org.apache.log4j.db.dialect"><code>SQLDialect</code></a>appropriate for your database system. Currently, we have
dialects for PostgreSQL, MySQL, Oracle and MsSQL. As mentioed previously, an
SQLDialect is required only if the JDBC driver for your database system does
not support the <a href="https://docs.oracle.com/javase/8/docs/api/java/sql/Statement.html?is-external=true#getGeneratedKeys()" title="class or interface in java.sql" class="externalLink"><code>getGeneratedKeys</code></a>
method.
</p>
<p>
<table border="1" cellpadding="4">
<caption>supported dialects</caption>
<tr>
<th>RDBMS</th>
<th>supports <br><code>getGeneratedKeys()</code> method</th>
<th>specific <br>SQLDialect support</th>
<tr>
<tr>
<td>PostgreSQL</td>
<td align="center">NO</td>
<td>present and used</td>
<tr>
<tr>
<td>MySQL</td>
<td align="center">YES</td>
<td>present, but not actually needed or used</td>
<tr>
<tr>
<td>Oracle</td>
<td align="center">YES</td>
<td>present, but not actually needed or used</td>
<tr>
<tr>
<td>DB2</td>
<td align="center">YES</td>
<td>not present, and not needed or used</td>
<tr>
<tr>
<td>MsSQL</td>
<td align="center">YES</td>
<td>not present, and not needed or used</td>
<tr>
<tr>
<td>HSQL</td>
<td align="center">NO</td>
<td>present and used</td>
<tr>
<p>
</table>
<p>
<b>Performance: </b> Experiments show that writing a single event into the
database takes approximately 50 milliseconds, on a "standard" PC. If pooled
connections are used, this figure drops to under 10 milliseconds. Note that
most JDBC drivers already ship with connection pooling support.
</p>
<p>
<p>
<p>
<p>
<b>Configuration </b> DBAppender can be configured programmatically, or using
<code>JoranConfigurator</code>. Example
scripts can be found in the <em>tests/input/db</em> directory.</div>
<dl>
<dt><span class="simpleTagLabel">Author:</span></dt>
<dd>Ceki G&uuml;lc&uuml;, Ray DeCampo</dd>
</dl>
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<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E()">DBAppender</a></span>()</code></th>
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<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#activateOptions()">activateOptions</a></span>()</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>protected void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#append(org.apache.log4j.spi.LoggingEvent)">append</a></span>&#8203;(org.apache.log4j.spi.LoggingEvent&nbsp;event)</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#close()">close</a></span>()</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code><a href="ConnectionSource.html" title="interface in org.apache.log4j.db">ConnectionSource</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getConnectionSource()">getConnectionSource</a></span>()</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getLocationInfo()">getLocationInfo</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns value of the <b>LocationInfo </b> property which determines whether
caller's location info is written to the database.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#parseUnrecognizedElement(org.w3c.dom.Element,java.util.Properties)">parseUnrecognizedElement</a></span>&#8203;(<a href="https://docs.oracle.com/javase/8/docs/api/org/w3c/dom/Element.html?is-external=true" title="class or interface in org.w3c.dom" class="externalLink">Element</a>&nbsp;element,
<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Properties.html?is-external=true" title="class or interface in java.util" class="externalLink">Properties</a>&nbsp;props)</code></th>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#requiresLayout()">requiresLayout</a></span>()</code></th>
<td class="colLast">
<div class="block">Gets whether appender requires a layout.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#setConnectionSource(org.apache.log4j.db.ConnectionSource)">setConnectionSource</a></span>&#8203;(<a href="ConnectionSource.html" title="interface in org.apache.log4j.db">ConnectionSource</a>&nbsp;connectionSource)</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#setLocationInfo(boolean)">setLocationInfo</a></span>&#8203;(boolean&nbsp;locationInfo)</code></th>
<td class="colLast">
<div class="block">If true, the information written to the database will include caller's
location information.</div>
</td>
</tr>
</table>
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<h3>Methods inherited from class&nbsp;org.apache.log4j.AppenderSkeleton</h3>
<code>addFilter, clearFilters, doAppend, finalize, getErrorHandler, getFilter, getFirstFilter, getLayout, getName, getThreshold, isAsSevereAsThreshold, setErrorHandler, setLayout, setName, setThreshold</code></li>
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<h4>DBAppender</h4>
<pre>public&nbsp;DBAppender()</pre>
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<h4>activateOptions</h4>
<pre class="methodSignature">public&nbsp;void&nbsp;activateOptions()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>activateOptions</code>&nbsp;in interface&nbsp;<code>org.apache.log4j.spi.OptionHandler</code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code>activateOptions</code>&nbsp;in class&nbsp;<code>org.apache.log4j.AppenderSkeleton</code></dd>
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<h4>getConnectionSource</h4>
<pre class="methodSignature">public&nbsp;<a href="ConnectionSource.html" title="interface in org.apache.log4j.db">ConnectionSource</a>&nbsp;getConnectionSource()</pre>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Returns the connectionSource.</dd>
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<h4>setConnectionSource</h4>
<pre class="methodSignature">public&nbsp;void&nbsp;setConnectionSource&#8203;(<a href="ConnectionSource.html" title="interface in org.apache.log4j.db">ConnectionSource</a>&nbsp;connectionSource)</pre>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>connectionSource</code> - The connectionSource to set.</dd>
</dl>
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<a id="append(org.apache.log4j.spi.LoggingEvent)">
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<h4>append</h4>
<pre class="methodSignature">protected&nbsp;void&nbsp;append&#8203;(org.apache.log4j.spi.LoggingEvent&nbsp;event)</pre>
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>append</code>&nbsp;in class&nbsp;<code>org.apache.log4j.AppenderSkeleton</code></dd>
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<h4>close</h4>
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>close</code>&nbsp;in interface&nbsp;<code>org.apache.log4j.Appender</code></dd>
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<h4>getLocationInfo</h4>
<pre class="methodSignature">public&nbsp;boolean&nbsp;getLocationInfo()</pre>
<div class="block">Returns value of the <b>LocationInfo </b> property which determines whether
caller's location info is written to the database.</div>
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<h4>setLocationInfo</h4>
<pre class="methodSignature">public&nbsp;void&nbsp;setLocationInfo&#8203;(boolean&nbsp;locationInfo)</pre>
<div class="block">If true, the information written to the database will include caller's
location information. Due to performance concerns, by default no location
information is written to the database.</div>
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<pre class="methodSignature">public&nbsp;boolean&nbsp;requiresLayout()</pre>
<div class="block">Gets whether appender requires a layout.</div>
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>requiresLayout</code>&nbsp;in interface&nbsp;<code>org.apache.log4j.Appender</code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>false</dd>
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<pre class="methodSignature">public&nbsp;boolean&nbsp;parseUnrecognizedElement&#8203;(<a href="https://docs.oracle.com/javase/8/docs/api/org/w3c/dom/Element.html?is-external=true" title="class or interface in org.w3c.dom" class="externalLink">Element</a>&nbsp;element,
<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Properties.html?is-external=true" title="class or interface in java.util" class="externalLink">Properties</a>&nbsp;props)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang" class="externalLink">Exception</a></pre>
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>parseUnrecognizedElement</code>&nbsp;in interface&nbsp;<code>org.apache.log4j.xml.UnrecognizedElementHandler</code></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang" class="externalLink">Exception</a></code></dd>
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