instancequery.html

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<A NAME="InstanceQuery()"><!-- --></A><H3>
InstanceQuery</H3>
<PRE>
public <B>InstanceQuery</B>()
              throws java.lang.Exception</PRE>
<DL>
<DD>Sets up the database drivers
<P>

<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE> - if an error occurs</DL>

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<B>Method Detail</B></FONT></TD>
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<A NAME="listOptions()"><!-- --></A><H3>
listOptions</H3>
<PRE>
public java.util.Enumeration <B>listOptions</B>()</PRE>
<DL>
<DD>Returns an enumeration describing the available options <p>
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../weka/core/OptionHandler.html#listOptions()">listOptions</A></CODE> in interface <CODE><A HREF="../../weka/core/OptionHandler.html" title="interface in weka.core">OptionHandler</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>an enumeration of all available options.</DL>
</DD>
</DL>
<HR>

<A NAME="setOptions(java.lang.String[])"><!-- --></A><H3>
setOptions</H3>
<PRE>
public void <B>setOptions</B>(java.lang.String[]&nbsp;options)
                throws java.lang.Exception</PRE>
<DL>
<DD>Parses a given list of options.

 Valid options are:<p>
 
 -S <br>
 Return a set of sparse instances rather than normal instances.<p>
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../weka/core/OptionHandler.html#setOptions(java.lang.String[])">setOptions</A></CODE> in interface <CODE><A HREF="../../weka/core/OptionHandler.html" title="interface in weka.core">OptionHandler</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>options</CODE> - the list of options as an array of strings
<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE> - if an option is not supported</DL>
</DD>
</DL>
<HR>

<A NAME="queryTipText()"><!-- --></A><H3>
queryTipText</H3>
<PRE>
public java.lang.String <B>queryTipText</B>()</PRE>
<DL>
<DD>Returns the tip text for this property
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>tip text for this property suitable for
 displaying in the explorer/experimenter gui</DL>
</DD>
</DL>
<HR>

<A NAME="setQuery(java.lang.String)"><!-- --></A><H3>
setQuery</H3>
<PRE>
public void <B>setQuery</B>(java.lang.String&nbsp;q)</PRE>
<DL>
<DD>Set the query to execute against the database
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>q</CODE> - the query to execute</DL>
</DD>
</DL>
<HR>

<A NAME="getQuery()"><!-- --></A><H3>
getQuery</H3>
<PRE>
public java.lang.String <B>getQuery</B>()</PRE>
<DL>
<DD>Get the query to execute against the database
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the query</DL>
</DD>
</DL>
<HR>

<A NAME="sparseDataTipText()"><!-- --></A><H3>
sparseDataTipText</H3>
<PRE>
public java.lang.String <B>sparseDataTipText</B>()</PRE>
<DL>
<DD>Returns the tip text for this property
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>tip text for this property suitable for
 displaying in the explorer/experimenter gui</DL>
</DD>
</DL>
<HR>

<A NAME="setSparseData(boolean)"><!-- --></A><H3>
setSparseData</H3>
<PRE>
public void <B>setSparseData</B>(boolean&nbsp;s)</PRE>
<DL>
<DD>Sets whether data should be encoded as sparse instances
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>s</CODE> - true if data should be encoded as a set of sparse instances</DL>
</DD>
</DL>
<HR>

<A NAME="getSparseData()"><!-- --></A><H3>
getSparseData</H3>
<PRE>
public boolean <B>getSparseData</B>()</PRE>
<DL>
<DD>Gets whether data is to be returned as a set of sparse instances
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>true if data is to be encoded as sparse instances</DL>
</DD>
</DL>
<HR>

<A NAME="getOptions()"><!-- --></A><H3>
getOptions</H3>
<PRE>
public java.lang.String[] <B>getOptions</B>()</PRE>
<DL>
<DD>Gets the current settings of InstanceQuery
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../weka/core/OptionHandler.html#getOptions()">getOptions</A></CODE> in interface <CODE><A HREF="../../weka/core/OptionHandler.html" title="interface in weka.core">OptionHandler</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>an array of strings suitable for passing to setOptions()</DL>
</DD>
</DL>
<HR>

<A NAME="retrieveInstances()"><!-- --></A><H3>
retrieveInstances</H3>
<PRE>
public <A HREF="../../weka/core/Instances.html" title="class in weka.core">Instances</A> <B>retrieveInstances</B>()
                            throws java.lang.Exception</PRE>
<DL>
<DD>Makes a database query using the query set through the -Q option 
 to convert a table into a set of instances
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the instances contained in the result of the query
<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE> - if an error occurs</DL>
</DD>
</DL>
<HR>

<A NAME="retrieveInstances(java.lang.String)"><!-- --></A><H3>
retrieveInstances</H3>
<PRE>
public <A HREF="../../weka/core/Instances.html" title="class in weka.core">Instances</A> <B>retrieveInstances</B>(java.lang.String&nbsp;query)
                            throws java.lang.Exception</PRE>
<DL>
<DD>Makes a database query to convert a table into a set of instances
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>query</CODE> - the query to convert to instances
<DT><B>Returns:</B><DD>the instances contained in the result of the query
<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE> - if an error occurs</DL>
</DD>
</DL>
<HR>

<A NAME="main(java.lang.String[])"><!-- --></A><H3>
main</H3>
<PRE>
public static void <B>main</B>(java.lang.String[]&nbsp;args)</PRE>
<DL>
<DD>Test the class from the command line. The instance
 query should be specified with -Q sql_query
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>args</CODE> - contains options for the instance query</DL>
</DD>
</DL>
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