org.camunda.bpm.engine.query
Interface Query<T extends Query<?,?>,U>

All Known Subinterfaces:

ActivityStatisticsQuery, AuthorizationQuery, CaseDefinitionQuery, CaseExecutionQuery, CaseInstanceQuery, DecisionDefinitionQuery, DeploymentQuery, DeploymentStatisticsQuery, EventSubscriptionQuery, ExecutionQuery, ExternalTaskQuery, FilterQuery, GroupQuery, HistoricActivityInstanceQuery, HistoricActivityStatisticsQuery, HistoricCaseActivityInstanceQuery, HistoricCaseInstanceQuery, HistoricDecisionInstanceQuery, HistoricDetailQuery, HistoricIncidentQuery, HistoricJobLogQuery, HistoricProcessInstanceQuery, HistoricTaskInstanceQuery, HistoricVariableInstanceQuery, IncidentQuery, JobDefinitionQuery, JobQuery, ProcessDefinitionQuery, ProcessDefinitionStatisticsQuery, ProcessInstanceQuery, TaskQuery, UserOperationLogQuery, UserQuery, VariableInstanceQuery

All Known Implementing Classes:

AbstractQuery, AbstractVariableQueryImpl, ActivityStatisticsQueryImpl, AuthorizationQueryImpl, CaseDefinitionQueryImpl, CaseExecutionQueryImpl, CaseInstanceQueryImpl, CaseSentryPartQueryImpl, DbGroupQueryImpl, DbUserQueryImpl, DecisionDefinitionQueryImpl, DeploymentQueryImpl, DeploymentStatisticsQueryImpl, EventSubscriptionQueryImpl, ExecutionQueryImpl, ExternalTaskQueryImpl, FilterQueryImpl, GroupQueryImpl, HistoricActivityInstanceQueryImpl, HistoricActivityStatisticsQueryImpl, HistoricCaseActivityInstanceQueryImpl, HistoricCaseInstanceQueryImpl, HistoricDecisionInstanceQueryImpl, HistoricDetailQueryImpl, HistoricIncidentQueryImpl, HistoricJobLogQueryImpl, HistoricProcessInstanceQueryImpl, HistoricTaskInstanceQueryImpl, HistoricVariableInstanceQueryImpl, IncidentQueryImpl, JobDefinitionQueryImpl, JobQueryImpl, ProcessDefinitionQueryImpl, ProcessDefinitionStatisticsQueryImpl, ProcessInstanceQueryImpl, TaskQueryImpl, UserOperationLogQueryImpl, UserQueryImpl, VariableInstanceQueryImpl

public interface Query<T extends Query<?,?>,U>

Describes basic methods for querying.

Author:

Frederik Heremans

Method Summary

T	asc() Order the results ascending on the given property as defined in this class (needs to come after a call to one of the orderByXxxx methods).
long	count() Executes the query and returns the number of results
T	desc() Order the results descending on the given property as defined in this class (needs to come after a call to one of the orderByXxxx methods).
List<U>	list() Executes the query and get a list of entities as the result.
List<U>	listPage(int firstResult, int maxResults) Executes the query and get a list of entities as the result.
U	singleResult() Executes the query and returns the resulting entity or null if no entity matches the query criteria.

Method Detail

asc

T asc()

Order the results ascending on the given property as defined in this class (needs to come after a call to one of the orderByXxxx methods).

desc

T desc()

Order the results descending on the given property as defined in this class (needs to come after a call to one of the orderByXxxx methods).

count

long count()

Executes the query and returns the number of results

singleResult

U singleResult()

Executes the query and returns the resulting entity or null if no entity matches the query criteria.

Throws:

ProcessEngineException - when the query results in more than one entities.

list

List<U> list()

Executes the query and get a list of entities as the result.

listPage

List<U> listPage(int firstResult,
                 int maxResults)

Executes the query and get a list of entities as the result.