org.datanucleus.store.rdbms.query

Class SQLQuery

java.lang.Object

org.datanucleus.store.query.Query

org.datanucleus.store.rdbms.query.SQLQuery

All Implemented Interfaces:

Serializable, org.datanucleus.ExecutionContextListener

public final class SQLQuery
extends org.datanucleus.store.query.Query

A Query using SQL. The majority of this has to be specified in the query filter itself. There are no variables/imports. Ordering/grouping is explicit in the query.

Results

Results from this type of query will be :-

• resultClass - each row of the ResultSet is converted into an instance of the result class
• candidateClass - each row of the ResultSet is converted into an instance of the candidate
• Object[] - when no candidate or result class specified
• Long - when the query is an INSERT/UPDATE/DELETE/MERGE

Parameters

Parameters to this type of query can be :-

• Positional : The SQL statement includes "?" and the parameters are positional starting at 1 (just like in JDBC).
• Numbered : The SQL statement includes "?1", "?2" etc (with numbers starting at 1) and the users input of parameters at execute is of the numbered parameters.
• Named : The SQL statement includes ":myParam1", ":myOtherParam" etc and the users input of parameters via "executeWithMap" includes values for all specified names.

See Also:

Serialized Form

Nested Class Summary

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

org.datanucleus.store.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 boolean	isCompiled State variable for the compilation state
protected org.datanucleus.metadata.QueryResultMetaData	resultMetaData MetaData defining the results of the query.
protected StatementMappingIndex[]	stmtMappings Mappings for the result 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_EXCLUDE_SUBCLASSES, EXTENSION_FLUSH_BEFORE_EXECUTION, EXTENSION_JDOQL_STRICT, EXTENSION_JPQL_STRICT, 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
SQLQuery(org.datanucleus.store.StoreManager storeMgr, org.datanucleus.ExecutionContext ec) Constructs a new query instance.
SQLQuery(org.datanucleus.store.StoreManager storeMgr, org.datanucleus.ExecutionContext ec, SQLQuery query) Constructor for a new query using the existing query as start point.
SQLQuery(org.datanucleus.store.StoreManager storeMgr, org.datanucleus.ExecutionContext ec, String queryString) Constructs a new query instance for the provided SQL query.

Method Summary

Modifier and Type	Method and Description
protected void	assertSupportsCancel() Method that will throw an UnsupportedOperationException if the query implementation doesn't support cancelling queries.
static boolean	columnNamesAreTheSame(DatastoreAdapter dba, String name1, String name2) Convenience method to compare two column names.
void	compileInternal(Map parameterValues) Verify the elements of the query and provide a hint to the query to prepare and optimize an execution plan.
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 remove any previous compilation of this Query.
boolean	equals(Object obj)
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	getLanguage()
protected ResultObjectFactory	getResultObjectFactoryForCandidateClass(ResultSet rs) Method to generate a ResultObjectFactory for converting rows of the provided ResultSet into instances of the candidate class.
int	hashCode()
protected boolean	isCompiled() Method to return if the query is compiled.
protected long	performDeletePersistentAll(Map parameters) Execute the query to delete persistent objects.
protected Object	performExecute(Map parameters) Execute the query and return the result.
protected Map	prepareForExecution(Map executeParameters) Method to process the input parameters preparing the statement and parameters for execution.
boolean	processesRangeInDatastoreQuery()
void	setCandidates(Collection pcs) Set the candidate Collection to query.
void	setCandidates(org.datanucleus.store.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(org.datanucleus.metadata.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.
protected boolean	supportsTimeout()

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

addExtension, addSubquery, applyImplicitParameterValueToCompilation, applyImplicitParameterValueToSubqueries, assertIsModifiable, assertIsOpen, cancel, cancel, cancelTaskObject, checkForMissingParameters, checkParameterTypesAgainstCompilation, checkUnusedParameters, close, closeAll, compile, deepFindSymbolForParameterInCompilation, deletePersistentAll, deletePersistentAll, deletePersistentAll, deregisterTask, execute, executeQuery, executionContextClosing, getBooleanExtensionProperty, getCandidateClass, getCandidateClassMetaData, getCandidateClassName, getCompilation, getDatastoreReadTimeoutMillis, getDatastoreWriteTimeoutMillis, getExecutionContext, getExplicitParametersDeclaration, getExplicitVariablesDeclaration, getExtension, getExtensions, getFetchPlan, getFilter, getFrom, getGrouping, getHaving, getIgnoreCache, getImplicitParameters, getImportsDeclaration, getInputParameters, getNativeQuery, getOrdering, getParameterMapForValues, getParsedImports, getQueryManager, getRange, getRangeFromIncl, getRangeFromInclParam, getRangeToExcl, getRangeToExclParam, getResult, getResultClass, getResultClassName, getResultDistinct, getSerializeRead, getStoreManager, getStringExtensionProperty, getSubqueryForVariable, getSupportedExtensions, getType, getUpdate, hasSubqueryForVariable, isSubclasses, isUnique, isUnmodifiable, prepareDatastore, registerTask, resolveClassDeclaration, setCacheResults, setCandidateClass, setCandidateClassName, setCompilation, setDatastoreReadTimeoutMillis, setDatastoreWriteTimeoutMillis, setExtensions, setFetchPlan, setFrom, setHaving, setIgnoreCache, setImplicitParameter, setImplicitParameter, setRange, setRange, setResultClassName, setResultDistinct, setSerializeRead, setType, setUnique, setUnmodifiable, setUpdate, 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 org.datanucleus.metadata.QueryResultMetaData resultMetaData

MetaData defining the results of the query.

isCompiled

protected transient boolean isCompiled

State variable for the compilation state

stmtMappings

protected transient StatementMappingIndex[] stmtMappings

Mappings for the result of the query.

Constructor Detail

SQLQuery

public SQLQuery(org.datanucleus.store.StoreManager storeMgr,
                org.datanucleus.ExecutionContext ec,
                SQLQuery query)

Constructor for a new query using the existing query as start point.

Parameters:

storeMgr - StoreManager for this query

ec - execution context

query - The existing query

SQLQuery

public SQLQuery(org.datanucleus.store.StoreManager storeMgr,
                org.datanucleus.ExecutionContext ec)

Constructs a new query instance.

Parameters:

storeMgr - StoreManager for this query

ec - execution context

SQLQuery

public SQLQuery(org.datanucleus.store.StoreManager storeMgr,
                org.datanucleus.ExecutionContext ec,
                String queryString)

Constructs a new query instance for the provided SQL query.

Parameters:

storeMgr - StoreManager for this query

ec - execution context

queryString - The SQL query string

Method Detail

getLanguage

public String getLanguage()

Overrides:

getLanguage in class org.datanucleus.store.query.Query

setCandidates

public void setCandidates(org.datanucleus.store.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 org.datanucleus.store.query.Query

Parameters:

pcs - the Candidate Extent.

Throws:

org.datanucleus.exceptions.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 org.datanucleus.store.query.Query

Parameters:

pcs - the Candidate collection.

Throws:

org.datanucleus.exceptions.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 org.datanucleus.store.query.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:

org.datanucleus.exceptions.NucleusUserException - Always thrown.

setResultMetaData

public void setResultMetaData(org.datanucleus.metadata.QueryResultMetaData qrmd)

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

Overrides:

setResultMetaData in class org.datanucleus.store.query.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 org.datanucleus.store.query.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:

org.datanucleus.exceptions.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 org.datanucleus.store.query.Query

Parameters:

subclasses - Whether to use subclasses

Throws:

org.datanucleus.exceptions.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 org.datanucleus.store.query.Query

Parameters:

filter - the query filter.

Throws:

org.datanucleus.exceptions.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 org.datanucleus.store.query.Query

Parameters:

variables - the variables separated by semicolons.

Throws:

org.datanucleus.exceptions.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 org.datanucleus.store.query.Query

Parameters:

parameters - the parameters separated by semicolons.

Throws:

org.datanucleus.exceptions.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 org.datanucleus.store.query.Query

Parameters:

imports - import statements separated by semicolons.

Throws:

org.datanucleus.exceptions.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 org.datanucleus.store.query.Query

Parameters:

grouping - the grouping specification.

Throws:

org.datanucleus.exceptions.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 org.datanucleus.store.query.Query

Parameters:

ordering - the ordering specification.

Throws:

org.datanucleus.exceptions.NucleusUserException - Always thrown.

performDeletePersistentAll

protected long performDeletePersistentAll(Map parameters)

Execute the query to delete persistent objects.

Overrides:

performDeletePersistentAll in class org.datanucleus.store.query.Query

Parameters:

parameters - the Map containing all of the parameters.

Returns:

the filtered QueryResult of the deleted objects.

shouldReturnSingleRow

protected boolean shouldReturnSingleRow()

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

Overrides:

shouldReturnSingleRow in class org.datanucleus.store.query.Query

Returns:

Whether it represents a unique row

processesRangeInDatastoreQuery

public boolean processesRangeInDatastoreQuery()

Overrides:

processesRangeInDatastoreQuery in class org.datanucleus.store.query.Query

equals

public boolean equals(Object obj)

Overrides:

equals in class org.datanucleus.store.query.Query

hashCode

public int hashCode()

Overrides:

hashCode in class org.datanucleus.store.query.Query

discardCompiled

protected void discardCompiled()

Utility to remove any previous compilation of this Query.

Overrides:

discardCompiled in class org.datanucleus.store.query.Query

isCompiled

protected boolean isCompiled()

Method to return if the query is compiled.

Overrides:

isCompiled in class org.datanucleus.store.query.Query

Returns:

Whether it is compiled

compileInternal

public void compileInternal(Map parameterValues)

Verify the elements of the query and provide a hint to the query to prepare and optimize an execution plan.

Specified by:

compileInternal in class org.datanucleus.store.query.Query

performExecute

protected Object performExecute(Map parameters)

Execute the query and return the result. For a SELECT query this will be the QueryResult. For an UPDATE/DELETE it will be the row count for the update statement.

Specified by:

performExecute in class org.datanucleus.store.query.Query

Parameters:

parameters - the Map containing all of the parameters (positional parameters) (not null)

Returns:

the result of the query

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 org.datanucleus.store.query.Query

Parameters:

parameters - the Object array with all of the parameters.

Returns:

The query results

executeWithMap

public Object executeWithMap(Map executeParameters)

Execute the query using the input Map of parameters.

Overrides:

executeWithMap in class org.datanucleus.store.query.Query

Parameters:

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

Returns:

The query results

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

assertSupportsCancel

protected void assertSupportsCancel()

Method that will throw an UnsupportedOperationException if the query implementation doesn't support cancelling queries.

Overrides:

assertSupportsCancel in class org.datanucleus.store.query.Query

supportsTimeout

protected boolean supportsTimeout()

Overrides:

supportsTimeout in class org.datanucleus.store.query.Query

getResultObjectFactoryForCandidateClass

protected ResultObjectFactory getResultObjectFactoryForCandidateClass(ResultSet rs)
                                                               throws SQLException

Method to generate a ResultObjectFactory for converting rows of the provided ResultSet into instances of the candidate class. Populates stmtMappings.

Parameters:

rs - The ResultSet

Returns:

The ResultObjectFactory

Throws:

SQLException - Thrown if an error occurs processing the ResultSet

columnNamesAreTheSame

public static boolean columnNamesAreTheSame(DatastoreAdapter dba,
                                            String name1,
                                            String name2)

Convenience method to compare two column names. Allows for case sensitivity issues, and for database added quoting.

Parameters:

dba - Datastore adapter

name1 - The first name (from the datastore)

name2 - The second name (from the user SQL statement)

Returns:

Whether they are the same