databaseutils.html

< 数据挖掘--实用机器学习技术及java实现> 一书结合数据挖掘和机器学习的知识,作者陈述了自动挖掘模式的基础理论,并且以java语言实现了具有代表性的各类数据挖掘方法.例如:class

<DL>
<DD>Get the value of DatabaseURL.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>Value of DatabaseURL.</DL>
</DD>
</DL>
<HR>

<A NAME="setDatabaseURL(java.lang.String)"><!-- --></A><H3>
setDatabaseURL</H3>
<PRE>
public void <B>setDatabaseURL</B>(java.lang.String&nbsp;newDatabaseURL)</PRE>
<DL>
<DD>Set the value of DatabaseURL.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>newDatabaseURL</CODE> - Value to assign to DatabaseURL.</DL>
</DD>
</DL>
<HR>

<A NAME="connectToDatabase()"><!-- --></A><H3>
connectToDatabase</H3>
<PRE>
public void <B>connectToDatabase</B>()
                       throws java.lang.Exception</PRE>
<DL>
<DD>Opens a connection to the database<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Throws:</B><DD><CODE>java.lang.Exception</CODE> - if an error occurs</DL>
</DD>
</DL>
<HR>

<A NAME="disconnectFromDatabase()"><!-- --></A><H3>
disconnectFromDatabase</H3>
<PRE>
public void <B>disconnectFromDatabase</B>()
                            throws java.lang.Exception</PRE>
<DL>
<DD>Closes the connection to the database.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Throws:</B><DD><CODE>java.lang.Exception</CODE> - if an error occurs</DL>
</DD>
</DL>
<HR>

<A NAME="isConnected()"><!-- --></A><H3>
isConnected</H3>
<PRE>
public boolean <B>isConnected</B>()</PRE>
<DL>
<DD>Returns true if a database connection is active.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>a value of type 'boolean'</DL>
</DD>
</DL>
<HR>

<A NAME="execute(java.lang.String)"><!-- --></A><H3>
execute</H3>
<PRE>
public boolean <B>execute</B>(java.lang.String&nbsp;query)
                throws java.sql.SQLException</PRE>
<DL>
<DD>Executes a SQL query.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>query</CODE> - the SQL query<DT><B>Returns:</B><DD>true if the query generated results<DT><B>Throws:</B><DD><CODE>java.sql.SQLException</CODE> - if an error occurs</DL>
</DD>
</DL>
<HR>

<A NAME="getResultSet()"><!-- --></A><H3>
getResultSet</H3>
<PRE>
public java.sql.ResultSet <B>getResultSet</B>()
                                throws java.sql.SQLException</PRE>
<DL>
<DD>Gets the results generated by a previous query.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the result set.<DT><B>Throws:</B><DD><CODE>java.sql.SQLException</CODE> - if an error occurs</DL>
</DD>
</DL>
<HR>

<A NAME="tableExists(java.lang.String)"><!-- --></A><H3>
tableExists</H3>
<PRE>
public boolean <B>tableExists</B>(java.lang.String&nbsp;tableName)
                    throws java.lang.Exception</PRE>
<DL>
<DD>Checks that a given table exists.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>tableName</CODE> - the name of the table to look for.<DT><B>Returns:</B><DD>true if the table exists.<DT><B>Throws:</B><DD><CODE>java.lang.Exception</CODE> - if an error occurs.</DL>
</DD>
</DL>
<HR>

<A NAME="isKeyInTable(java.lang.String, weka.experiment.ResultProducer, java.lang.Object[])"><!-- --></A><H3>
isKeyInTable</H3>
<PRE>
protected boolean <B>isKeyInTable</B>(java.lang.String&nbsp;tableName,
                               <A HREF="../../weka/experiment/ResultProducer.html">ResultProducer</A>&nbsp;rp,
                               java.lang.Object[]&nbsp;key)
                        throws java.lang.Exception</PRE>
<DL>
<DD>Executes a database query to see whether a result for the supplied key
 is already in the database.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>tableName</CODE> - the name of the table to search for the key in<DD><CODE>rp</CODE> - the ResultProducer who will generate the result if required<DD><CODE>key</CODE> - the key for the result<DT><B>Returns:</B><DD>true if the result with that key is in the database already<DT><B>Throws:</B><DD><CODE>java.lang.Exception</CODE> - if an error occurs</DL>
</DD>
</DL>
<HR>

<A NAME="getResultFromTable(java.lang.String, weka.experiment.ResultProducer, java.lang.Object[])"><!-- --></A><H3>
getResultFromTable</H3>
<PRE>
public java.lang.Object[] <B>getResultFromTable</B>(java.lang.String&nbsp;tableName,
                                             <A HREF="../../weka/experiment/ResultProducer.html">ResultProducer</A>&nbsp;rp,
                                             java.lang.Object[]&nbsp;key)
                                      throws java.lang.Exception</PRE>
<DL>
<DD>Executes a database query to extract a result for the supplied key
 from the database.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>tableName</CODE> - the name of the table where the result is stored<DD><CODE>rp</CODE> - the ResultProducer who will generate the result if required<DD><CODE>key</CODE> - the key for the result<DT><B>Returns:</B><DD>true if the result with that key is in the database already<DT><B>Throws:</B><DD><CODE>java.lang.Exception</CODE> - if an error occurs</DL>
</DD>
</DL>
<HR>

<A NAME="putResultInTable(java.lang.String, weka.experiment.ResultProducer, java.lang.Object[], java.lang.Object[])"><!-- --></A><H3>
putResultInTable</H3>
<PRE>
public void <B>putResultInTable</B>(java.lang.String&nbsp;tableName,
                             <A HREF="../../weka/experiment/ResultProducer.html">ResultProducer</A>&nbsp;rp,
                             java.lang.Object[]&nbsp;key,
                             java.lang.Object[]&nbsp;result)
                      throws java.lang.Exception</PRE>
<DL>
<DD>Executes a database query to insert a result for the supplied key
 into the database.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>tableName</CODE> - the name of the table where the result is stored<DD><CODE>rp</CODE> - the ResultProducer who will generate the result if required<DD><CODE>key</CODE> - the key for the result<DD><CODE>result</CODE> - the result to store<DT><B>Returns:</B><DD>true if the result with that key is in the database already<DT><B>Throws:</B><DD><CODE>java.lang.Exception</CODE> - if an error occurs</DL>
</DD>
</DL>
<HR>

<A NAME="experimentIndexExists()"><!-- --></A><H3>
experimentIndexExists</H3>
<PRE>
public boolean <B>experimentIndexExists</B>()
                              throws java.lang.Exception</PRE>
<DL>
<DD>Returns true if the experiment index exists.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>true if the index exists<DT><B>Throws:</B><DD><CODE>java.lang.Exception</CODE> - if an error occurs</DL>
</DD>
</DL>
<HR>

<A NAME="createExperimentIndex()"><!-- --></A><H3>
createExperimentIndex</H3>
<PRE>
public void <B>createExperimentIndex</B>()
                           throws java.lang.Exception</PRE>
<DL>
<DD>Attempts to create the experiment index table<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Throws:</B><DD><CODE>java.lang.Exception</CODE> - if an error occurs.</DL>
</DD>
</DL>
<HR>

<A NAME="createExperimentIndexEntry(weka.experiment.ResultProducer)"><!-- --></A><H3>
createExperimentIndexEntry</H3>
<PRE>
public java.lang.String <B>createExperimentIndexEntry</B>(<A HREF="../../weka/experiment/ResultProducer.html">ResultProducer</A>&nbsp;rp)
                                            throws java.lang.Exception</PRE>
<DL>
<DD>Attempts to insert a results entry for the table into the
 experiment index.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>rp</CODE> - the ResultProducer generating the results<DT><B>Returns:</B><DD>the name of the created results table<DT><B>Throws:</B><DD><CODE>java.lang.Exception</CODE> - if an error occurs.</DL>
</DD>
</DL>
<HR>

<A NAME="getResultsTableName(weka.experiment.ResultProducer)"><!-- --></A><H3>
getResultsTableName</H3>
<PRE>
public java.lang.String <B>getResultsTableName</B>(<A HREF="../../weka/experiment/ResultProducer.html">ResultProducer</A>&nbsp;rp)
                                     throws java.lang.Exception</PRE>
<DL>
<DD>Gets the name of the experiment table that stores results from a
 particular ResultProducer.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>rp</CODE> - the ResultProducer<DT><B>Returns:</B><DD>the name of the table where the results for this ResultProducer
 are stored, or null if there is no table for this ResultProducer.<DT><B>Throws:</B><DD><CODE>java.lang.Exception</CODE> - if an error occurs</DL>
</DD>
</DL>
<HR>

<A NAME="createResultsTable(weka.experiment.ResultProducer, java.lang.String)"><!-- --></A><H3>
createResultsTable</H3>
<PRE>
public java.lang.String <B>createResultsTable</B>(<A HREF="../../weka/experiment/ResultProducer.html">ResultProducer</A>&nbsp;rp,
                                           java.lang.String&nbsp;tableName)
                                    throws java.lang.Exception</PRE>
<DL>
<DD>Creates a results table for the supplied result producer.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>rp</CODE> - the ResultProducer generating the results<DD><CODE>tableName</CODE> - the name of the resultsTable<DT><B>Returns:</B><DD>the name of the created results table<DT><B>Throws:</B><DD><CODE>java.lang.Exception</CODE> - if an error occurs.</DL>
</DD>
</DL>
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