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Oracle&reg; OLAP Java API Reference 11g Release 2 (11.2) E10794-01 Beta Draft
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<H2>

oracle.olapi.data.cursor
 
Interface Cursor</H2>
<DL>
<DT>All Known Subinterfaces: <DD><A HREF="../../../../oracle/olapi/data/cursor/CompoundCursor.html" title="interface in oracle.olapi.data.cursor">CompoundCursor</A>, <A HREF="../../../../oracle/olapi/data/cursor/ValueCursor.html" title="interface in oracle.olapi.data.cursor">ValueCursor</A></DD>
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<DT><PRE>public interface Cursor</DL>
</PRE>

An interface for objects that provide access to the result set of a query.
 A query is represented by a <code>Source</code>.
 A <code>Cursor</code> communicates the query to Oracle OLAP and fetches
 the resulting data.

At any time, one element of a <code>Cursor</code> is in the current position
 of the <code>Cursor</code>.
 The <code>getPosition</code> method returns the current position and the
 <code>setPosition</code> and <code>next</code> methods change the current position.
 The extent of a <code>Cursor</code> is the total number of positions of the
 <code>Cursor</code>.

An <code>Source</code> is associated with a <code>Transaction</code>.
 A <code>Source</code> is active in the <code>Transaction</code> with which it
 is associated or in a descendent of that <code>Transaction</code>.
 Before an application can create a <code>Cursor</code> for a <code>Source</code>, 
 the current <code>Transaction</code> must be the one with which the
 <code>Source</code> is associated or it must be a descendent of that
 <code>Transaction</code>.
 For more information on transactions, see the 
 <A HREF="../../../../oracle/olapi/transaction/TransactionProvider.html" title="interface in oracle.olapi.transaction"><CODE>TransactionProvider</CODE></A> 
 interface.

An application creates a <code>Cursor</code> for a <code>Source</code> 
 by calling the <CODE>createCursor</CODE> method of a <code>CursorManager</code>.
 The following example demonstrates creating a <code>Cursor</code> for a 
 <CODE>Source</CODE> named <CODE>query</CODE>.

<pre>
 CursorManager cursorManager = dataProvider.createCursorManager(query);
 Cursor cursor = cursorManager.createCursor();</pre>

An application can create more than one <code>Cursor</code> from the same
 <code>CursorManager</code>.
 It would do this if, for example, it wanted to display different views
 of the same data.

The <code>Cursor</code> interface has two subinterfaces:
 <code>CompoundCursor</code> and <code>ValueCursor</code>.
 The type of <code>Cursor</code> returned by the <code>createCursor</code>
 method is determined by the structure of the <code>Source</code> for the
 <code>Cursor</code>.
 If the <code>Source</code> for the <code>Cursor</code> has no outputs,
 then the <code>Cursor</code> has only one set of values and the
 <code>createCursor</code> method returns a <code>ValueCursor</code>,
 the elements of which have the values specified by the
 <code>Source</code>.
 If the <code>Source</code> has one or more outputs, then the
 <code>createCursor</code> method returns a <code>CompoundCursor</code>.

A <code>CompoundCursor</code> has two or more child <code>Cursor</code> objects.
 The children are the base <code>ValueCursor</code> for the
 <code>CompoundCursor</code> and a <CODE>Cursor</CODE> object for each output
 of the <CODE>Source</CODE>.
 If the output of the <code>Source</code> is a <code>Source</code> that
 itself has one or more outputs, then the child <code>Cursor</code> for that
 output is another <code>CompoundCursor</code>.
 If the output is a <code>Source</code> that has no outputs, then the child
 <code>Cursor</code> is a <code>ValueCursor</code>.
 Each position of a <code>CompoundCursor</code> specifies a position for each of
 the <code>ValueCursor</code> objects in the tree of the descendents of the
 <code>CompoundCursor</code>.

An application can affect the behavior of a <CODE>Cursor</CODE> by 
 creating a <code>CursorSpecification</code>, which implements the 
 <CODE>CursorInfoSpecification</CODE> interface.
 An application creates a <CODE>CursorInfoSpecification</CODE> with the
 <CODE>createCursorInfoSpecification</CODE> method of a <CODE>DataProvider</CODE>.
 With a <code>CursorSpecification</code>, an application can specify whether
 Oracle OLAP calculates the extent of a <code>Cursor</code> or the starting 
 and ending positions of the current value of a child <code>Cursor</code> in 
 the parent <code>Cursor</code>.
 If a <CODE>CursorSpecification</CODE> specifies those calculations, then
 the application can retrieve information with the <code>getExtent</code>,
 <code>getParentStart</code>, or <code>getParentEnd</code> methods.
 By subtracting the starting position of the current value of a child in
 the parent from the ending position of the value and adding one, you can
 calculate the range of positions, or span, of the value of the child
 <code>Cursor</code>.

The extent of a child <code>ValueCursor</code> in a parent 
 <code>CompoundCursor</code> is the number of positions the 
 <code>ValueCursor</code> has for the set of values specified by the other 
 <code>ValueCursor</code> descendents.
 For example, if a <code>Source</code> defines the result set for a measure, which
 has only one value for any set of values of the dimensions of the measure, then the
 <code>ValueCursor</code> that has the values of the measure has only one position
 for any one set of output values. The extent of that <code>ValueCursor</code> is,
 therefore, always 1.

The fetch size of a <code>Cursor</code> specifies the number of elements of
 the <code>Cursor</code> that Oracle OLAP sends to the client application
 during a single fetch from the data store.
 If the <code>CursorSpecification</code> for the <code>Cursor</code> is set
 to specify the default fetch size, you can retrieve the fetch size by calling
 the <code>getFetchSize</code> method.
 You can change the fetch size by calling the <code>setFetchSize</code>
 method.

Some <code>Source</code> objects cannot have a <code>Cursor</code>.
 You cannot retrieve results with a <code>Cursor</code> for a
 <code>Source</code> if one of the following is true:
 <ul>
 <li>The <code>Source</code> has an input.
 <li>The <code>Source</code> has no elements or the <code>Source</code> has an input
 that has no elements.
 <li>The query is not computationally possible; for example, the query
 involves an infinite recursion.
 <li>The result set is infinite; for example, the <code>Source</code>
 represents all integers.
 </ul>

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<CODE>static&nbsp;int</CODE></TD>
<TD><CODE><A HREF="../../../../oracle/olapi/data/cursor/Cursor.html#FETCH_SIZE_NOT_SPECIFIED">FETCH_SIZE_NOT_SPECIFIED</A></CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A constant value returned by the <code>getDefaultFetchSize</code> method
 of a <code>CursorSpecification</code> object if the default fetch size is
 not specified by the <code>CursorSpecification</code>.</TD>
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<CODE>&nbsp;long</CODE></TD>
<TD><CODE><A HREF="../../../../oracle/olapi/data/cursor/Cursor.html#getExtent()">getExtent</A>()</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Gets the total number of positions of the <code>Cursor</code> if the
 <code>CursorSpecification</code> associated with the <code>Cursor</code> is 
 set to calculate the extent.</TD>
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<CODE>&nbsp;int</CODE></TD>
<TD><CODE><A HREF="../../../../oracle/olapi/data/cursor/Cursor.html#getFetchSize()">getFetchSize</A>()</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Gets the fetch size for the <code>Cursor</code> if the
 <code>CursorSpecification</code> for the <code>Cursor</code> is set
 to specify the fetch size.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
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<CODE>&nbsp;long</CODE></TD>
<TD><CODE><A HREF="../../../../oracle/olapi/data/cursor/Cursor.html#getParentEnd()">getParentEnd</A>()</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Gets the position in the parent <code>Cursor</code> at which
 the current element of the child <code>Cursor</code> ends if the
 <code>CursorSpecification</code> for the <code>Cursor</code> is set
 to calculate the ending position.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<CODE>&nbsp;long</CODE></TD>
<TD><CODE><A HREF="../../../../oracle/olapi/data/cursor/Cursor.html#getParentStart()">getParentStart</A>()</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Gets the position in the parent <code>Cursor</code> at which
 the current element of the child <code>Cursor</code> begins if the
 <code>CursorSpecification</code> for the <code>Cursor</code> is set to
 calculate the beginning position.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<CODE>&nbsp;long</CODE></TD>
<TD><CODE><A HREF="../../../../oracle/olapi/data/cursor/Cursor.html#getPosition()">getPosition</A>()</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Gets the current position of the <code>Cursor</code>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%">
<CODE>&nbsp;<A HREF="../../../../oracle/olapi/data/cursor/SourceIdentifier.html" title="interface in oracle.olapi.data.cursor">SourceIdentifier</A></CODE></TD>
<TD><CODE><A HREF="../../../../oracle/olapi/data/cursor/Cursor.html#getSource()">getSource</A>()</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Gets the <code>SourceIdentifier</code> for the <code>Cursor</code>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%">
<CODE>&nbsp;boolean</CODE></TD>
<TD><CODE><A HREF="../../../../oracle/olapi/data/cursor/Cursor.html#next()">next</A>()</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Advances the position of the <code>Cursor</code> to the next element
 if the current position is not the last position of the <code>Cursor</code>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%">
<CODE>&nbsp;void</CODE></TD>
<TD><CODE><A HREF="../../../../oracle/olapi/data/cursor/Cursor.html#setFetchSize(int)">setFetchSize</A>(int&nbsp;fetchSize)</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Specifies the fetch size for the <code>Cursor</code>
 if the <code>CursorSpecification</code> for the <code>Cursor</code>
 is set to specify the fetch size.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%">
<CODE>&nbsp;void</CODE></TD>
<TD><CODE><A HREF="../../../../oracle/olapi/data/cursor/Cursor.html#setPosition(long)">setPosition</A>(long&nbsp;position)</CODE>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Specifies a position to set as the current position of the <code>Cursor</code>.</TD>
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<A NAME="FETCH_SIZE_NOT_SPECIFIED"></A><H3>
FETCH_SIZE_NOT_SPECIFIED</H3>
<PRE>
static final int FETCH_SIZE_NOT_SPECIFIED</PRE>
<DL>
<DD>A constant value returned by the <code>getDefaultFetchSize</code> method
 of a <code>CursorSpecification</code> object if the default fetch size is
 not specified by the <code>CursorSpecification</code>.

<DL>
<DT>See Also:<DD><A HREF="../../../../constant-values.html#oracle.olapi.data.cursor.Cursor.FETCH_SIZE_NOT_SPECIFIED">Constant Field Values</A></DL>
</DL>

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<A NAME="getSource()"></A><H3>
getSource</H3>
<PRE>
<A HREF="../../../../oracle/olapi/data/cursor/SourceIdentifier.html" title="interface in oracle.olapi.data.cursor">SourceIdentifier</A> getSource()</PRE>
<DL>
<DD>Gets the <code>SourceIdentifier</code> for the <code>Cursor</code>.

<DD><DL>

<DT>Returns:<DD>The <code>SourceIdentifier</code> for the <code>Cursor</code>.</DL>
</DD>
</DL>
<HR>

<A NAME="getPosition()"></A><H3>
getPosition</H3>
<PRE>
long getPosition()</PRE>
<DL>
<DD>Gets the current position of the <code>Cursor</code>.

<DD><DL>

<DT>Returns:<DD>The current position of the <code>Cursor</code>.</DL>
</DD>
</DL>
<HR>

<A NAME="setPosition(long)"></A><H3>
setPosition</H3>
<PRE>
void setPosition(long&nbsp;position)
 throws <A HREF="../../../../oracle/olapi/data/cursor/PositionOutOfBoundsException.html" title="class in oracle.olapi.data.cursor">PositionOutOfBoundsException</A></PRE>
<DL>
<DD>Specifies a position to set as the current position of the <code>Cursor</code>.

<DD><DL>
<DT>Parameters:<DD><CODE>position</CODE> - The position to set as the current position of the
 <code>Cursor</code>.
<DT>Throws:
<DD><CODE><A HREF="../../../../oracle/olapi/data/cursor/PositionOutOfBoundsException.html" title="class in oracle.olapi.data.cursor">PositionOutOfBoundsException</A></CODE> - Indicates that the specified position
 is not valid.</DL>
</DD>
</DL>
<HR>

<A NAME="next()"></A><H3>
next</H3>
<PRE>
boolean next()</PRE>
<DL>
<DD>Advances the position of the <code>Cursor</code> to the next element
 if the current position is not the last position of the <code>Cursor</code>.

<DD><DL>

<DT>Returns:<DD><code>true</code> when the method successfully advances the
 position of the <code>Cursor</code> and <code>false</code> when it
 does not.</DL>
</DD>
</DL>
<HR>

<A NAME="getExtent()"></A><H3>
getExtent</H3>
<PRE>
long getExtent()
 throws <A HREF="../../../../oracle/olapi/data/cursor/NotSpecifiedException.html" title="class in oracle.olapi.data.cursor">NotSpecifiedException</A></PRE>
<DL>
<DD>Gets the total number of positions of the <code>Cursor</code> if the
 <code>CursorSpecification</code> associated with the <code>Cursor</code> is 
 set to calculate the extent. 
 The extent of a <code>ValueCursor</code> that is a descendent in a 
 <code>CompoundCursor</code> is determined by the values of the other outputs.

<DD><DL>

<DT>Returns:<DD>The total number of positions of the <code>Cursor</code>.
<DT>Throws:
<DD><CODE><A HREF="../../../../oracle/olapi/data/cursor/NotSpecifiedException.html" title="class in oracle.olapi.data.cursor">NotSpecifiedException</A></CODE> - Indicates that the <CODE>CursorSpecification</CODE>
 does not specify calculating the extent.</DL>
</DD>
</DL>
<HR>

<A NAME="getParentStart()"></A><H3>
getParentStart</H3>
<PRE>
long getParentStart()
 throws <A HREF="../../../../oracle/olapi/data/cursor/NotSpecifiedException.html" title="class in oracle.olapi.data.cursor">NotSpecifiedException</A></PRE>
<DL>
<DD>Gets the position in the parent <code>Cursor</code> at which
 the current element of the child <code>Cursor</code> begins if the
 <code>CursorSpecification</code> for the <code>Cursor</code> is set to
 calculate the beginning position.

<DD><DL>

<DT>Returns:<DD>The position in the parent <code>Cursor</code> at which the
 current element of the child <code>Cursor</code> begins.
<DT>Throws:
<DD><CODE><A HREF="../../../../oracle/olapi/data/cursor/NotSpecifiedException.html" title="class in oracle.olapi.data.cursor">NotSpecifiedException</A></CODE> - Indicates that the <CODE>CursorSpecification</CODE>
 does not specify calculating the beginning position.</DL>
</DD>
</DL>
<HR>

<A NAME="getParentEnd()"></A><H3>
getParentEnd</H3>
<PRE>
long getParentEnd()
 throws <A HREF="../../../../oracle/olapi/data/cursor/NotSpecifiedException.html" title="class in oracle.olapi.data.cursor">NotSpecifiedException</A></PRE>
<DL>
<DD>Gets the position in the parent <code>Cursor</code> at which
 the current element of the child <code>Cursor</code> ends if the
 <code>CursorSpecification</code> for the <code>Cursor</code> is set
 to calculate the ending position.

<DD><DL>

<DT>Returns:<DD>The position in the parent <code>Cursor</code> at which the
 current element of the child <code>Cursor</code> ends.
<DT>Throws:
<DD><CODE><A HREF="../../../../oracle/olapi/data/cursor/NotSpecifiedException.html" title="class in oracle.olapi.data.cursor">NotSpecifiedException</A></CODE> - Indicates that the <CODE>CursorSpecification</CODE>
 does not specify calculating the ending position.</DL>
</DD>
</DL>
<HR>

<A NAME="getFetchSize()"></A><H3>
getFetchSize</H3>
<PRE>
int getFetchSize()
 throws <A HREF="../../../../oracle/olapi/data/cursor/NotSpecifiedException.html" title="class in oracle.olapi.data.cursor">NotSpecifiedException</A></PRE>
<DL>
<DD>Gets the fetch size for the <code>Cursor</code> if the
 <code>CursorSpecification</code> for the <code>Cursor</code> is set
 to specify the fetch size.

<DD><DL>

<DT>Returns:<DD>The fetch size specified for the <code>Cursor</code>.
<DT>Throws:
<DD><CODE><A HREF="../../../../oracle/olapi/data/cursor/NotSpecifiedException.html" title="class in oracle.olapi.data.cursor">NotSpecifiedException</A></CODE></DL>
</DD>
</DL>
<HR>

<A NAME="setFetchSize(int)"></A><H3>
setFetchSize</H3>
<PRE>
void setFetchSize(int&nbsp;fetchSize)
 throws <A HREF="../../../../oracle/olapi/data/cursor/NotSpecifiedException.html" title="class in oracle.olapi.data.cursor">NotSpecifiedException</A></PRE>
<DL>
<DD>Specifies the fetch size for the <code>Cursor</code>
 if the <code>CursorSpecification</code> for the <code>Cursor</code>
 is set to specify the fetch size.

<DD><DL>
<DT>Parameters:<DD><CODE>fetchSize</CODE> - The fetch size to specify for the <code>Cursor</code>.
<DT>Throws:
<DD><CODE><A HREF="../../../../oracle/olapi/data/cursor/NotSpecifiedException.html" title="class in oracle.olapi.data.cursor">NotSpecifiedException</A></CODE> - Indicates that the <CODE>CursorSpecification</CODE>
 does not specify setting a fetch size.</DL>
</DD>
</DL>

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