Package ubic.gemma.persistence.util

Class QueryUtils

java.lang.Object

ubic.gemma.persistence.util.QueryUtils

public class QueryUtils
extends Object

Utilities for Query.

Author:

poirigui

Field Summary

Fields

Modifier and Type	Field	Description
static int	MAX_PARAMETER_LIST_SIZE	Largest parameter list size for which optimizeParameterList(Collection) should be used.

Constructor Summary

Constructors

Constructor	Description
QueryUtils()

Method Summary

Modifier and Type	Method	Description
static <T extends Identifiable> List<List<T>>	batchIdentifiableParameterList(Collection<T> list, int batchSize)
static <T extends Comparable<T>> List<List<T>>	batchParameterList(Collection<T> list, int batchSize)	Partition a parameter list into a collection of batches of a given size.
static String	escapeLike(String s)
static <S extends Comparable<S>,T> List<T>	listByBatch(Query query, String batchParam, Collection<S> list, int batchSize)
static <S extends Comparable<S>,T> List<T>	listByBatch(Query query, String batchParam, Collection<S> list, int batchSize, int maxResults)	List the results of a query by a fixed batch size.
static <T extends Identifiable> Collection<T>	optimizeIdentifiableParameterList(Collection<T> list)	Optimize a collection of Identifiable entities.
static <T extends Comparable<T>> Collection<T>	optimizeParameterList(Collection<T> list)	Optimize a given parameter list by sorting, removing duplicates and padding to the next power of two.
static <S extends Comparable<S>,T> Stream<T>	streamByBatch(Query query, String batchParam, Collection<S> list, int batchSize)	Stream the results of a query by a fixed batch size.
static <S extends Comparable<S>,T> Stream<T>	streamByBatch(Query query, String batchParam, Collection<S> list, int batchSize, Class<T> clazz)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

MAX_PARAMETER_LIST_SIZE

public static final int MAX_PARAMETER_LIST_SIZE

Largest parameter list size for which optimizeParameterList(Collection) should be used. Past this size, no padding will be performed and a warning will be emitted.

See Also:

Constant Field Values

Constructor Detail

QueryUtils

public QueryUtils()

Method Detail

optimizeParameterList

public static <T extends Comparable<T>> Collection<T> optimizeParameterList(Collection<T> list)

Optimize a given parameter list by sorting, removing duplicates and padding to the next power of two.

This is a temporary solution until we update to Hibernate 5.2.18 which introduced hibernate.query.in_clause_parameter_padding. Read more about this topic.

optimizeIdentifiableParameterList

public static <T extends Identifiable> Collection<T> optimizeIdentifiableParameterList(Collection<T> list)

Optimize a collection of Identifiable entities.

See Also:

optimizeParameterList(Collection)

batchParameterList

public static <T extends Comparable<T>> List<List<T>> batchParameterList(Collection<T> list,
                                                                         int batchSize)

Partition a parameter list into a collection of batches of a given size.

It is recommended to use a power of two in case the same query is also prepared via optimizeParameterList(Collection). This will make it so that the execution plan can be reused.

batchIdentifiableParameterList

public static <T extends Identifiable> List<List<T>> batchIdentifiableParameterList(Collection<T> list,
                                                                                    int batchSize)

listByBatch

public static <S extends Comparable<S>,T> List<T> listByBatch(Query query,
                                                                    String batchParam,
                                                                    Collection<S> list,
                                                                    int batchSize)

See Also:

listByBatch(Query, String, Collection, int, int)

listByBatch

public static <S extends Comparable<S>,T> List<T> listByBatch(Query query,
                                                                    String batchParam,
                                                                    Collection<S> list,
                                                                    int batchSize,
                                                                    int maxResults)

List the results of a query by a fixed batch size.

Parameters:

query - the query

batchParam - a parameter of the query for batching

list - a collection of values for the batch parameters to retrieve

batchSize - the number of elements to fetch in each batch

maxResults - maximum number of results to return, or -1 to ignore

streamByBatch

public static <S extends Comparable<S>,T> Stream<T> streamByBatch(Query query,
                                                                        String batchParam,
                                                                        Collection<S> list,
                                                                        int batchSize,
                                                                        Class<T> clazz)

See Also:

streamByBatch(Query, String, Collection, int)

streamByBatch

public static <S extends Comparable<S>,T> Stream<T> streamByBatch(Query query,
                                                                        String batchParam,
                                                                        Collection<S> list,
                                                                        int batchSize)

Stream the results of a query by a fixed batch size.

See Also:

listByBatch(Query, String, Collection, int)

escapeLike

public static String escapeLike(String s)