Package org.hibernate

Interface ScrollableResults<R>

All Superinterfaces:

AutoCloseable, Closeable

All Known Subinterfaces:

ScrollableResultsImplementor<R>

All Known Implementing Classes:

AbstractScrollableResults, EmptyScrollableResults, FetchingScrollableResultsImpl, ScrollableResultsImpl

public interface ScrollableResults<R>
extends AutoCloseable, Closeable

A result iterator that allows moving around within the results by arbitrary increments. The Query / ScrollableResults pattern is very similar to the JDBC PreparedStatement/ ResultSet pattern and so the semantics of methods of this interface are similar to the similarly-named methods of ResultSet.

Contrary to JDBC, columns of results are numbered from zero.

See Also:

Query.scroll()

Method Summary

Modifier and Type	Method	Description
void	afterLast()	Go to a location just after the last result.
void	beforeFirst()	Go to a location just before first result.
void	close()	Release resources immediately.
boolean	first()	Go to the first result.
R	get()	Get the current row of results.
int	getRowNumber()	Get the current position in the results.
boolean	isFirst()	Is this the first result?
boolean	isLast()	Is this the last result?
boolean	last()	Go to the last result.
boolean	next()	Advance to the next result.
boolean	position(int position)	Moves the result cursor to the specified position.
boolean	previous()	Retreat to the previous result.
boolean	scroll(int positions)	Scroll the specified number of positions from the current position.
void	setFetchSize(int fetchSize)	Gives the JDBC driver a hint as to the number of rows that should be fetched from the database when more rows are needed.
boolean	setRowNumber(int rowNumber)	Set the current position in the result set.

Method Detail

get

R get()

Get the current row of results.

Returns:

The array of results

close

void close()

Release resources immediately.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

next

boolean next()

Advance to the next result.

Returns:

true if there is another result

previous

boolean previous()

Retreat to the previous result.

Returns:

true if there is a previous result

scroll

boolean scroll(int positions)

Scroll the specified number of positions from the current position.

Parameters:

positions - a positive (forward) or negative (backward) number of rows

Returns:

true if there is a result at the new location

position

boolean position(int position)

Moves the result cursor to the specified position.

Returns:

true if there is a result at the new location

last

boolean last()

Go to the last result.

Returns:

true if there are any results

first

boolean first()

Go to the first result.

Returns:

true if there are any results

beforeFirst

void beforeFirst()

Go to a location just before first result.

This is the location of the cursor on a newly returned scrollable result.

afterLast

void afterLast()

Go to a location just after the last result.

isFirst

boolean isFirst()

Is this the first result?

Returns:

true if this is the first row of results, otherwise false

isLast

boolean isLast()

Is this the last result?

Returns:

true if this is the last row of results.

getRowNumber

int getRowNumber()

Get the current position in the results.

The first position is number 0 (unlike JDBC).

Returns:

The current position number, numbered from 0; -1 indicates that there is no current row

setRowNumber

boolean setRowNumber(int rowNumber)

Set the current position in the result set.

Can be numbered from the first result (positive number) or backward from the last result (negative number).

Parameters:

rowNumber - the row number. A positive number indicates a value numbered from the first row; a negative number indicates a value numbered from the last row.

Returns:

true if there is a row at that row number

setFetchSize

void setFetchSize(int fetchSize)

Gives the JDBC driver a hint as to the number of rows that should be fetched from the database when more rows are needed. If 0, the JDBC driver's default setting will be used.

Since:

6.1.2

See Also:

ResultSet.setFetchSize(int), JdbcSettings.STATEMENT_FETCH_SIZE