org.synyx.hades.dao.query
Class QueryUtils

java.lang.Object
  org.synyx.hades.dao.query.QueryUtils

public abstract class QueryUtils
extends java.lang.Object

Simple utility class to create JPA queries.

Author:

Oliver Gierke - gierke@synyx.de

Field Summary

static java.lang.String	COUNT_QUERY_STRING
static java.lang.String	DELETE_ALL_QUERY_STRING
static java.lang.String	READ_ALL_QUERY

Method Summary

static <T> javax.persistence.Query	applyAndBind(java.lang.String queryString, java.util.Collection<T> entities, javax.persistence.EntityManager entityManager) Creates a where-clause referencing the given entities and appends it to the given query string.
static java.lang.String	applySorting(java.lang.String query, Sort sort) Adds order by clause to the JPQL query.
static java.lang.String	applySorting(java.lang.String query, Sort sort, java.lang.String alias) Adds order by clause to the JPQL query.
static java.lang.String	createCountQueryFor(java.lang.String originalQuery) Creates a count projected query from the given orginal query.
static java.lang.String	detectAlias(java.lang.String query) Resolves the alias for the entity to be retrieved from the given JPA query.
static java.lang.String	getQueryString(java.lang.String template, java.lang.Class<?> clazz) Returns the query string for the given class.
static java.lang.String	getQueryString(java.lang.String template, java.lang.String clazzName) Returns the query string for the given class name.

Methods inherited from class java.lang.Object

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

Field Detail

COUNT_QUERY_STRING

public static final java.lang.String COUNT_QUERY_STRING

See Also:

Constant Field Values

DELETE_ALL_QUERY_STRING

public static final java.lang.String DELETE_ALL_QUERY_STRING

See Also:

Constant Field Values

READ_ALL_QUERY

public static final java.lang.String READ_ALL_QUERY

See Also:

Constant Field Values

Method Detail

getQueryString

public static java.lang.String getQueryString(java.lang.String template,
                                              java.lang.Class<?> clazz)

Returns the query string for the given class.

Returns:

getQueryString

public static java.lang.String getQueryString(java.lang.String template,
                                              java.lang.String clazzName)

Returns the query string for the given class name.

Parameters:

template -

clazzName -

Returns:

applySorting

public static java.lang.String applySorting(java.lang.String query,
                                            Sort sort)

Adds order by clause to the JPQL query. Uses the DEFAULT_ALIAS to bind the sorting property to.

Parameters:

query -

alias -

sort -

Returns:

applySorting

public static java.lang.String applySorting(java.lang.String query,
                                            Sort sort,
                                            java.lang.String alias)

Adds order by clause to the JPQL query.

Parameters:

query -

sort -

alias -

Returns:

detectAlias

public static java.lang.String detectAlias(java.lang.String query)

Resolves the alias for the entity to be retrieved from the given JPA query.

Parameters:

query -

Returns:

applyAndBind

public static <T> javax.persistence.Query applyAndBind(java.lang.String queryString,
                                                       java.util.Collection<T> entities,
                                                       javax.persistence.EntityManager entityManager)

Creates a where-clause referencing the given entities and appends it to the given query string. Binds the given entities to the query.

Type Parameters:

T -

Parameters:

queryString -

entities -

entityManager -

Returns:

createCountQueryFor

public static java.lang.String createCountQueryFor(java.lang.String originalQuery)

Creates a count projected query from the given orginal query.

Parameters:

originalQuery - must not be null or empty

Returns: