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 <div class="subTitle">org.apache.log4j.db</div>
 <h2 title="Class CustomSQLDBReceiver" class="title">Class CustomSQLDBReceiver</h2>
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 <li>org.apache.log4j.db.CustomSQLDBReceiver</li>
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 <pre>public class <span class="typeNameLabel">CustomSQLDBReceiver</span>
 extends <a href="../../../../org/apache/log4j/plugins/Receiver.html" title="class in org.apache.log4j.plugins">Receiver</a>
 implements <a href="../../../../org/apache/log4j/plugins/Pauseable.html" title="interface in org.apache.log4j.plugins">Pauseable</a>, org.apache.log4j.xml.UnrecognizedElementHandler</pre>
 <div class="block">Converts log data stored in a database into LoggingEvents.
  <p>
  <b>NOTE:</b> This receiver cannot yet be created through Chainsaw's receiver panel.
  It must be created through an XML configuration file.
  <p>
  This receiver supports database configuration via ConnectionSource, in the
  org.apache.log4j.db package: DriverManagerConnectionSource,
  DataSourceConnectionSource, JNDIConnectionSource
  <p>
  This database receiver differs from DBReceiver in that this receiver relies
  on custom SQL to retrieve logging event data, where DBReceiver requires the
  use of a log4j-defined schema.
  <p>
  A 'refreshMillis' int parameter controls SQL execution. If 'refreshMillis' is
  zero (the default), the receiver will run only one time. If it is set to any
  other numeric value, the SQL will be executed on a recurring basis every
  'refreshMillis' milliseconds.
  <p>
  The receiver closes the connection and acquires a new connection on each
  execution of the SQL (use pooled connections if possible).
  <p>
  If the SQL will be executing on a recurring basis, specify the IDField param -
  the column name holding the unique identifier (int) representing the logging
  event.
  <p>
  As events are retrieved, the column represented by IDField is examined and
  the largest value is held and used by the next execution of the SQL statement
  to avoid retrieving previously processed events.
  <p>
  As an example, the IDField references a 'COUNTER' (int, auto-increment,
  unique) column. The first execution of the SQL statement returns 500 rows,
  with a final value in the COUNTER field of 500.
  <p>
  The SQL statement is manipulated prior to the next execution, adding ' WHERE
  COUNTER &gt; 500' to the statement to avoid retrieval of previously processed
  events.
  <p>
  The select statement must provide ALL fields which define a LoggingEvent.
  <p>
  The SQL statement MUST include the columns: LOGGER, TIMESTAMP, LEVEL, THREAD,
  MESSAGE, NDC, MDC, CLASS, METHOD, FILE, LINE, PROPERTIES, THROWABLE
  <p>
  Use ' AS ' in the SQL statement to alias the SQL's column names to match your
  database schema. (see example below).
  <p>
  Include all fields in the SQL statement, even if you don't have data for the
  field (specify an empty string as the value for columns which you don't have
  data).
  <p>
  The TIMESTAMP column must be a datetime.
  <p>
  Both a PROPERTIES column and an MDC column are supported. These fields
  represent Maps on the logging event, but require the use of string
  concatenation database functions to hold the (possibly multiple) name/value
  pairs in the column.
  <p>
  For example, to include both 'userid' and 'lastname' properties in the
  logging event (from either the PROPERTIES or MDC columns), the name/value
  pairs must be concatenated together by your database.
  <p>
  The resulting PROPERTIES or MDC column must have data in this format: {{name,
  value, name2, value2}}
  <p>
  The resulting PROPERTIES column would contain this text: {{userid, someone,
  lastname, mylastname}}
  <p>
  Here is an example of concatenating a PROPERTIES or MDC column using MySQL's
  concat function, where the 'application' and 'hostname' parameters were fixed
  text, but the 'log4jid' key's value is the value of the COUNTER column:
  <p>
  concat("{{application,databaselogs,hostname,mymachine,log4jid,", COUNTER,
  "}}") as PROPERTIES
  <p>
  log4jid is a special property that is used by Chainsaw to represent an 'ID'
  field. Specify this property to ensure you can map events in Chainsaw to
  events in the database if you need to go back and view events at a later time
  or save the events to XML for later analysis.
  <p>
  Here is a complete MySQL SQL statement which can be used to provide events to
  Chainsaw (note how in the example below, there is no column in logtable representing the throwable, so an
  empty string is passed in and an ALIAS is still defined):
  <p>
  select myloggercolumn as LOGGER, mytimestampcolumn as TIMESTAMP, mylevelcolumn as LEVEL, mythreadcolumn as
  THREAD, mymessagecolumn as MESSAGE, myndccolumn as NDC, mymdccolumn as MDC, myclasscolumn as CLASS, mymethodcolumn as
  METHOD, myfilecolumn as FILE, mylinecolumn as LINE,
  concat("{{application,databaselogs,hostname,mymachine, log4jid,",
  COUNTER,"}}") as PROPERTIES, "" as THROWABLE from logtable
  <p></div>
 <dl>
 <dt><span class="simpleTagLabel">Author:</span></dt>
 <dd>Scott Deboy &lt;sdeboy@apache.org&gt;
  <p></dd>
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 <th class="colFirst" scope="col">Modifier and Type</th>
 <th class="colLast" scope="col">Field and Description</th>
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 <tr class="altColor">
 <td class="colFirst"><code>protected <a href="http://docs.oracle.com/javase/6/docs/api/java/sql/Connection.html?is-external=true" title="class or interface in java.sql">Connection</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/db/CustomSQLDBReceiver.html#connection">connection</a></span></code>&nbsp;</td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>protected <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/db/CustomSQLDBReceiver.html#idField">idField</a></span></code>&nbsp;</td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>static <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/db/CustomSQLDBReceiver.html#LOG4J_ID_KEY">LOG4J_ID_KEY</a></span></code>&nbsp;</td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>protected <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/db/CustomSQLDBReceiver.html#sqlStatement">sqlStatement</a></span></code>&nbsp;</td>
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 <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/db/CustomSQLDBReceiver.html#CustomSQLDBReceiver--">CustomSQLDBReceiver</a></span>()</code>&nbsp;</td>
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 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/db/CustomSQLDBReceiver.html#activateOptions--">activateOptions</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i1" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/db/CustomSQLDBReceiver.html#close--">close</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i2" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/db/CustomSQLDBReceiver.html#finalize--">finalize</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i3" class="rowColor">
 <td class="colFirst"><code><a href="../../../../org/apache/log4j/db/ConnectionSource.html" title="interface in org.apache.log4j.db">ConnectionSource</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/db/CustomSQLDBReceiver.html#getConnectionSource--">getConnectionSource</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i4" class="altColor">
 <td class="colFirst"><code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/db/CustomSQLDBReceiver.html#getIDField--">getIDField</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i5" class="rowColor">
 <td class="colFirst"><code>int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/db/CustomSQLDBReceiver.html#getRefreshMillis--">getRefreshMillis</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i6" class="altColor">
 <td class="colFirst"><code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/db/CustomSQLDBReceiver.html#getSql--">getSql</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i7" class="rowColor">
 <td class="colFirst"><code>boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/db/CustomSQLDBReceiver.html#isPaused--">isPaused</a></span>()</code>
 <div class="block">Get paused state.</div>
 </td>
 </tr>
 <tr id="i8" class="altColor">
 <td class="colFirst"><code>boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/db/CustomSQLDBReceiver.html#parseUnrecognizedElement-org.w3c.dom.Element-java.util.Properties-">parseUnrecognizedElement</a></span>(<a href="http://docs.oracle.com/javase/6/docs/api/org/w3c/dom/Element.html?is-external=true" title="class or interface in org.w3c.dom">Element</a>&nbsp;element,
                         <a href="http://docs.oracle.com/javase/6/docs/api/java/util/Properties.html?is-external=true" title="class or interface in java.util">Properties</a>&nbsp;props)</code></td>
 </tr>
 <tr id="i9" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/db/CustomSQLDBReceiver.html#setConnectionSource-org.apache.log4j.db.ConnectionSource-">setConnectionSource</a></span>(<a href="../../../../org/apache/log4j/db/ConnectionSource.html" title="interface in org.apache.log4j.db">ConnectionSource</a>&nbsp;connectionSource)</code>&nbsp;</td>
 </tr>
 <tr id="i10" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/db/CustomSQLDBReceiver.html#setIDField-java.lang.String-">setIDField</a></span>(<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;id)</code>&nbsp;</td>
 </tr>
 <tr id="i11" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/db/CustomSQLDBReceiver.html#setPaused-boolean-">setPaused</a></span>(boolean&nbsp;p)</code>
 <div class="block">Set paused state.</div>
 </td>
 </tr>
 <tr id="i12" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/db/CustomSQLDBReceiver.html#setRefreshMillis-int-">setRefreshMillis</a></span>(int&nbsp;refreshMillis)</code>&nbsp;</td>
 </tr>
 <tr id="i13" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/db/CustomSQLDBReceiver.html#setSql-java.lang.String-">setSql</a></span>(<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;s)</code>&nbsp;</td>
 </tr>
 <tr id="i14" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/db/CustomSQLDBReceiver.html#shutdown--">shutdown</a></span>()</code>
 <div class="block">Call when the plugin should be stopped.</div>
 </td>
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