org.datanucleus.store.query

Class AbstractSQLQuery

java.lang.Object

org.datanucleus.store.query.Query

org.datanucleus.store.query.AbstractSQLQuery

All Implemented Interfaces:

Serializable, ExecutionContextListener

public abstract class AbstractSQLQuery
extends Query

Base definition of a query using SQL. Based around the JDO definition of an SQL query where you typically set the SQL query filter and have parameters set-able but not much else.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.datanucleus.store.query.Query

Query.SubqueryDefinition

Field Summary

Fields

Modifier and Type	Field and Description
protected String	compiledSQL The actual SQL issued at execution time.
protected String	inputSQL The statement that the user specified to the Query.
protected QueryResultMetaData	resultMetaData MetaData defining the results of the query.

Fields inherited from class org.datanucleus.store.query.Query

BULK_DELETE, BULK_UPDATE, candidateClass, candidateClassName, clr, compilation, ec, explicitParameters, explicitVariables, EXTENSION_CHECK_UNUSED_PARAMETERS, EXTENSION_CLOSE_RESULTS_AT_EC_CLOSE, EXTENSION_COMPILATION_CACHED, EXTENSION_EVALUATE_IN_MEMORY, EXTENSION_FLUSH_BEFORE_EXECUTION, EXTENSION_LOAD_RESULTS_AT_COMMIT, EXTENSION_MULTITHREAD, EXTENSION_RESULT_CACHE_TYPE, EXTENSION_RESULT_SIZE_METHOD, EXTENSION_RESULTS_CACHED, EXTENSION_USE_FETCH_PLAN, extensions, filter, from, fromInclNo, fromInclParam, grouping, having, ignoreCache, implicitParameters, imports, inputParameters, ordering, OTHER, parameterNames, parsedImports, queryResults, range, result, resultClass, resultClassName, resultDistinct, SELECT, storeMgr, subclasses, subqueries, tasks, toExclNo, toExclParam, type, unique, unmodifiable, update

Constructor Summary

Constructors

Constructor and Description
AbstractSQLQuery(StoreManager storeMgr, ExecutionContext ec, AbstractSQLQuery query) Constructs a new query instance from the existing query.
AbstractSQLQuery(StoreManager storeMgr, ExecutionContext ec, String sqlText) Constructs a new query instance having the same criteria as the given query.

Method Summary

Modifier and Type	Method and Description
void	declareExplicitParameters(String parameters) Declare the explicit parameters to be used in the query.
void	declareExplicitVariables(String variables) Declare the unbound variables to be used in the query.
void	declareImports(String imports) Set the import statements to be used to identify the fully qualified name of variables or parameters.
protected void	discardCompiled() Utility to discard any compiled query.
Object	executeWithArray(Object[] parameters) Execute the query and return the filtered List.
Object	executeWithMap(Map executeParameters) Execute the query using the input Map of parameters.
String	getInputSQL() Accessor for the user-input SQL query.
String	getLanguage() Accessor for the query language.
protected long	performDeletePersistentAll(Map parameters) Execute the query to delete persistent objects.
protected Map	prepareForExecution(Map executeParameters) Method to process the input parameters preparing the statement and parameters for execution.
void	setCandidates(Collection pcs) Set the candidate Collection to query.
void	setCandidates(Extent pcs) Set the candidate Extent to query.
void	setFilter(String filter) Set the filter for the query.
void	setGrouping(String grouping) Set the grouping specification for the result Collection.
void	setOrdering(String ordering) Set the ordering specification for the result Collection.
void	setRange(int fromIncl, int toExcl) Set the range of the results.
void	setResult(String result) Set the result for the results.
void	setResultClass(Class result_cls) Set the result class for the results.
void	setResultMetaData(QueryResultMetaData qrmd) Method to set the MetaData defining the result.
void	setSubclasses(boolean subclasses) Method to set whether to use subclasses.
protected boolean	shouldReturnSingleRow() Convenience method to return whether the query should return a single row.

Methods inherited from class org.datanucleus.store.query.Query

addExtension, addSubquery, applyImplicitParameterValueToCompilation, applyImplicitParameterValueToSubqueries, assertIsModifiable, assertIsOpen, assertSupportsCancel, cancel, cancel, cancelTaskObject, checkForMissingParameters, checkParameterTypesAgainstCompilation, checkUnusedParameters, close, closeAll, compile, compileInternal, deepFindSymbolForParameterInCompilation, deletePersistentAll, deletePersistentAll, deletePersistentAll, deregisterTask, equals, execute, executeQuery, executionContextClosing, getBooleanExtensionProperty, getCandidateClass, getCandidateClassMetaData, getCandidateClassName, getCompilation, getDatastoreReadTimeoutMillis, getDatastoreWriteTimeoutMillis, getExecutionContext, getExplicitParameters, getExplicitVariables, getExtension, getExtensions, getFetchPlan, getFilter, getFrom, getGrouping, getHaving, getIgnoreCache, getImplicitParameters, getImports, getInputParameters, getNativeQuery, getOrdering, getParameterMapForValues, getParsedImports, getQueryManager, getRange, getRangeFromIncl, getRangeFromInclParam, getRangeToExcl, getRangeToExclParam, getResult, getResultClass, getResultClassName, getResultDistinct, getSerializeRead, getStoreManager, getStringExtensionProperty, getSubqueryForVariable, getSupportedExtensions, getType, getUpdate, hashCode, hasSubqueryForVariable, isCompiled, isSubclasses, isUnique, isUnmodifiable, performExecute, prepareDatastore, processesRangeInDatastoreQuery, registerTask, resolveClassDeclaration, setCacheResults, setCandidateClass, setCandidateClassName, setCompilation, setDatastoreReadTimeoutMillis, setDatastoreWriteTimeoutMillis, setExtensions, setFetchPlan, setFrom, setHaving, setIgnoreCache, setImplicitParameter, setImplicitParameter, setRange, setRange, setResultClassName, setResultDistinct, setSerializeRead, setType, setUnique, setUnmodifiable, setUpdate, supportsTimeout, useCaching, useFetchPlan, useResultsCaching

Methods inherited from class java.lang.Object

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

Field Detail

inputSQL

protected final transient String inputSQL

The statement that the user specified to the Query.

compiledSQL

protected transient String compiledSQL

The actual SQL issued at execution time.

resultMetaData

protected QueryResultMetaData resultMetaData

MetaData defining the results of the query.

Constructor Detail

AbstractSQLQuery

public AbstractSQLQuery(StoreManager storeMgr,
                        ExecutionContext ec,
                        AbstractSQLQuery query)

Constructs a new query instance from the existing query.

Parameters:

storeMgr - StoreManager for this query

ec - ExecutionContext

query - Existing query

AbstractSQLQuery

public AbstractSQLQuery(StoreManager storeMgr,
                        ExecutionContext ec,
                        String sqlText)

Constructs a new query instance having the same criteria as the given query.

Parameters:

storeMgr - StoreManager for this query

ec - The ExecutionContext

sqlText - The SQL query string

Method Detail

getLanguage

public String getLanguage()

Description copied from class: Query

Accessor for the query language.

Overrides:

getLanguage in class Query

Returns:

Query language

discardCompiled

protected void discardCompiled()

Utility to discard any compiled query.

Overrides:

discardCompiled in class Query

See Also:

Query.discardCompiled()

getInputSQL

public String getInputSQL()

Accessor for the user-input SQL query.

Returns:

User-input SQL

setCandidates

public void setCandidates(Extent pcs)

Set the candidate Extent to query. This implementation always throws a NucleusUserException since this concept doesn't apply to SQL queries.

Specified by:

setCandidates in class Query

Parameters:

pcs - the Candidate Extent.

Throws:

NucleusUserException - Always thrown since method not applicable

setCandidates

public void setCandidates(Collection pcs)

Set the candidate Collection to query. This implementation always throws a NucleusUserException since this concept doesn't apply to SQL queries.

Specified by:

setCandidates in class Query

Parameters:

pcs - the Candidate collection.

Throws:

NucleusUserException - Always thrown since method not applicable

setResult

public void setResult(String result)

Set the result for the results. The application might want to get results from a query that are not instances of the candidate class. The results might be fields of persistent instances, instances of classes other than the candidate class, or aggregates of fields. This implementation always throws a NucleusUserException since this concept doesn't apply to SQL queries.

Overrides:

setResult in class Query

Parameters:

result - The result parameter consists of the optional keyword distinct followed by a commaseparated list of named result expressions or a result class specification.

Throws:

NucleusUserException - Always thrown.

setResultMetaData

public void setResultMetaData(QueryResultMetaData qrmd)

Method to set the MetaData defining the result. Setting this will unset the resultClass.

Overrides:

setResultMetaData in class Query

Parameters:

qrmd - Query Result MetaData

setResultClass

public void setResultClass(Class result_cls)

Set the result class for the results. Setting this will unset the resultMetaData.

Overrides:

setResultClass in class Query

Parameters:

result_cls - The result class

setRange

public void setRange(int fromIncl,
                     int toExcl)

Set the range of the results. Not applicable for SQL. This implementation always throws a NucleusUserException since this concept doesn't apply to SQL queries.

Parameters:

fromIncl - From element no (inclusive) to return

toExcl - To element no (exclusive) to return

Throws:

NucleusUserException - Always thrown.

setSubclasses

public void setSubclasses(boolean subclasses)

Method to set whether to use subclasses. Not applicable for SQL. This implementation always throws a NucleusUserException since this concept doesn't apply to SQL queries.

Overrides:

setSubclasses in class Query

Parameters:

subclasses - Whether to use subclasses

Throws:

NucleusUserException - Always thrown.

setFilter

public void setFilter(String filter)

Set the filter for the query. Not applicable for SQL. This implementation always throws a NucleusUserException since this concept doesn't apply to SQL queries.

Overrides:

setFilter in class Query

Parameters:

filter - the query filter.

Throws:

NucleusUserException - Always thrown since method not applicable

declareExplicitVariables

public void declareExplicitVariables(String variables)

Declare the unbound variables to be used in the query. This implementation always throws a NucleusUserException since this concept doesn't apply to SQL queries.

Overrides:

declareExplicitVariables in class Query

Parameters:

variables - the variables separated by semicolons.

Throws:

NucleusUserException - Always thrown since method not applicable

declareExplicitParameters

public void declareExplicitParameters(String parameters)

Declare the explicit parameters to be used in the query. This implementation always throws a NucleusUserException since this concept doesn't apply to SQL queries.

Overrides:

declareExplicitParameters in class Query

Parameters:

parameters - the parameters separated by semicolons.

Throws:

NucleusUserException - Always thrown.

declareImports

public void declareImports(String imports)

Set the import statements to be used to identify the fully qualified name of variables or parameters. This implementation always throws a NucleusUserException since this concept doesn't apply to SQL queries.

Overrides:

declareImports in class Query

Parameters:

imports - import statements separated by semicolons.

Throws:

NucleusUserException - Always thrown.

setGrouping

public void setGrouping(String grouping)

Set the grouping specification for the result Collection. This implementation always throws a NucleusUserException since this concept doesn't apply to SQL queries.

Overrides:

setGrouping in class Query

Parameters:

grouping - the grouping specification.

Throws:

NucleusUserException - Always thrown.

setOrdering

public void setOrdering(String ordering)

Set the ordering specification for the result Collection. This implementation always throws a NucleusUserException since this concept doesn't apply to SQL queries.

Overrides:

setOrdering in class Query

Parameters:

ordering - the ordering specification.

Throws:

NucleusUserException - Always thrown.

performDeletePersistentAll

protected long performDeletePersistentAll(Map parameters)

Execute the query to delete persistent objects.

Overrides:

performDeletePersistentAll in class Query

Parameters:

parameters - the Map containing all of the parameters.

Returns:

the filtered QueryResult of the deleted objects.

executeWithArray

public Object executeWithArray(Object[] parameters)

Execute the query and return the filtered List. Override the method in Query since we want the parameter names to be Integer based here.

Overrides:

executeWithArray in class Query

Parameters:

parameters - the Object array with all of the parameters.

Returns:

The query results

See Also:

Query.executeQuery(Map parameters)

executeWithMap

public Object executeWithMap(Map executeParameters)

Execute the query using the input Map of parameters.

Overrides:

executeWithMap in class Query

Parameters:

executeParameters - the Map of the parameters passed in to execute().

Returns:

The query results

See Also:

Query.executeQuery(Map parameters)

prepareForExecution

protected Map prepareForExecution(Map executeParameters)

Method to process the input parameters preparing the statement and parameters for execution. The parameters returned are ready for execution. Compiles the query, and updates the "compiledSQL" and "parameterNames". Supports positional parameters, numbered parameters (?1, ?2), and named parameters (:p1, :p3). If using named parameters then the keys of the Map must align to the names in the SQL. If using numbered/positional parameters then the keys of the Map must be Integer and align with the parameter numbers/positions.

Parameters:

executeParameters - The input parameters map

Returns:

Map of parameters for execution

shouldReturnSingleRow

protected boolean shouldReturnSingleRow()

Convenience method to return whether the query should return a single row.

Overrides:

shouldReturnSingleRow in class Query

Returns:

Whether it represents a unique row