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public interface XQResultSequence
This interface represents a sequence of items obtained as a result of
evaluation XQuery expressions. The result sequence is tied to the
XQconnection
object on which the expression was evaluated.
This sequence can be obtained by performing an executeQuery
on the expression object. It represents a cursor-like interface.
The XQResultSequence
object is dependent on
the connection and the expression from which it was created and is only
valid for the duration of those objects. Thus, if any one of those objects is closed,
this XQResultSequence
object will be implicitly closed
and it can no longer be used. Similarly re-executing the expression
also implicitly closes the associated result sequences.
An XQJ driver is not required to provide finalizer methods for the connection and other objects. Hence it is strongly recommended that users call close method explicitly to free any resources. It is also recommended that they do so under a final block to ensure that the object is closed even when there are exceptions. Not closing this object implicitly or explicitly might result in serious memory leaks.
When the XQResultSequence
is closed any
XQResultItem
objects obtained from it
are also implicitly closed.
Example -
XQPreparedExpression expr = conn.prepareExpression("for $i .."); XQResultSequence result = expr.executeQuery(); // create the ItemTypes for string and integer XQItemType strType = conn.createAtomicType(XQItemType.XQBASETYPE_STRING); XQItemType intType = conn.createAtomicType(XQItemType.XQBASETYPE_INT); // posititioned before the first item while (result.next()) { XQItemType type = result.getItemType(); // If string, then get the string value out if (type.equals(strType)) String str = result.getAtomicValue(); else if (type.equals(intType)) // if it is an integer.. int intval = result.getInt(); ... } result.close(); // explicitly close the result sequence
Method Summary | |
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XQConnection |
getConnection()
Gets the XQuery connection associated with this result sequence |
Methods inherited from interface javax.xml.xquery.XQSequence |
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absolute, afterLast, beforeFirst, close, count, first, getItem, getPosition, getSequenceAsStream, getSequenceAsString, isAfterLast, isBeforeFirst, isClosed, isFirst, isLast, isOnItem, isScrollable, last, next, previous, relative, writeSequence, writeSequence, writeSequenceToResult, writeSequenceToSAX |
Methods inherited from interface javax.xml.xquery.XQItemAccessor |
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getAtomicValue, getBoolean, getByte, getDouble, getFloat, getInt, getItemAsStream, getItemAsString, getItemType, getLong, getNode, getNodeUri, getObject, getShort, instanceOf, writeItem, writeItem, writeItemToResult, writeItemToSAX |
Method Detail |
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XQConnection getConnection() throws XQException
XQException
- if the result sequence is in a closed state
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