org.apache.cassandra.cql3.statements

Class SelectStatement

java.lang.Object

org.apache.cassandra.cql3.statements.SelectStatement

All Implemented Interfaces:

CQLStatement

public class SelectStatement
extends java.lang.Object
implements CQLStatement

Encapsulates a completely parsed SELECT query, including the target column family, expression, result count, and ordering clause. A number of public methods here are only used internally. However, many of these are made accessible for the benefit of custom QueryHandler implementations, so before reducing their accessibility due consideration should be given.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	SelectStatement.Parameters
static class	SelectStatement.RawStatement

Field Summary

Fields

Modifier and Type	Field and Description
CFMetaData	cfm
SelectStatement.Parameters	parameters

Constructor Summary

Constructors

Constructor and Description
SelectStatement(CFMetaData cfm, int boundTerms, SelectStatement.Parameters parameters, Selection selection, Term limit)

Method Summary

Modifier and Type	Method and Description
void	checkAccess(ClientState state) Perform any access verification necessary for the statement.
java.lang.String	columnFamily()
ResultMessage.Rows	execute(QueryState state, QueryOptions options) Execute the statement and return the resulting result or null if there is no result.
ResultMessage.Rows	executeInternal(QueryState state, QueryOptions options) Variante of execute used for internal query against the system tables, and thus only query the local node.
int	getBoundTerms() May be used by custom QueryHandler implementations
AbstractBounds<RowPosition>	getKeyBounds(QueryOptions options) May be used by custom QueryHandler implementations
int	getLimit(QueryOptions options) May be used by custom QueryHandler implementations
Pageable	getPageableCommand(QueryOptions options)
ResultSet.Metadata	getResultMetadata()
Selection	getSelection() May be used by custom QueryHandler implementations
java.util.List<IndexExpression>	getValidatedIndexExpressions(QueryOptions options) May be used by custom QueryHandler implementations
boolean	hasClusteringColumnsRestriction() May be used by custom QueryHandler implementations
boolean	hasPartitionKeyRestriction() May be used by custom QueryHandler implementations
java.lang.String	keyspace()
ResultSet	process(java.util.List<Row> rows)
ResultMessage.Rows	processResults(java.util.List<Row> rows, QueryOptions options, int limit, long now)
void	validate(ClientState state) Perform additional validation required by the statment.

Methods inherited from class java.lang.Object

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

Field Detail

cfm

public final CFMetaData cfm

parameters

public final SelectStatement.Parameters parameters

Constructor Detail

SelectStatement

public SelectStatement(CFMetaData cfm,
                       int boundTerms,
                       SelectStatement.Parameters parameters,
                       Selection selection,
                       Term limit)

Method Detail

getResultMetadata

public ResultSet.Metadata getResultMetadata()

getBoundTerms

public int getBoundTerms()

May be used by custom QueryHandler implementations

Specified by:

getBoundTerms in interface CQLStatement

getSelection

public Selection getSelection()

May be used by custom QueryHandler implementations

checkAccess

public void checkAccess(ClientState state)
                 throws InvalidRequestException,
                        UnauthorizedException

Description copied from interface: CQLStatement

Perform any access verification necessary for the statement.

Specified by:

checkAccess in interface CQLStatement

Parameters:

state - the current client state

Throws:

InvalidRequestException

UnauthorizedException

validate

public void validate(ClientState state)
              throws InvalidRequestException

Description copied from interface: CQLStatement

Perform additional validation required by the statment. To be overriden by subclasses if needed.

Specified by:

validate in interface CQLStatement

Parameters:

state - the current client state

Throws:

InvalidRequestException

execute

public ResultMessage.Rows execute(QueryState state,
                                  QueryOptions options)
                           throws RequestExecutionException,
                                  RequestValidationException

Description copied from interface: CQLStatement

Execute the statement and return the resulting result or null if there is no result.

Specified by:

execute in interface CQLStatement

Parameters:

state - the current query state

options - options for this query (consistency, variables, pageSize, ...)

Throws:

RequestExecutionException

RequestValidationException

getPageableCommand

public Pageable getPageableCommand(QueryOptions options)
                            throws RequestValidationException

Throws:

RequestValidationException

processResults

public ResultMessage.Rows processResults(java.util.List<Row> rows,
                                         QueryOptions options,
                                         int limit,
                                         long now)
                                  throws RequestValidationException

Throws:

RequestValidationException

executeInternal

public ResultMessage.Rows executeInternal(QueryState state,
                                          QueryOptions options)
                                   throws RequestExecutionException,
                                          RequestValidationException

Description copied from interface: CQLStatement

Variante of execute used for internal query against the system tables, and thus only query the local node.

Specified by:

executeInternal in interface CQLStatement

Parameters:

state - the current query state

Throws:

RequestExecutionException

RequestValidationException

process

public ResultSet process(java.util.List<Row> rows)
                  throws InvalidRequestException

Throws:

InvalidRequestException

keyspace

public java.lang.String keyspace()

columnFamily

public java.lang.String columnFamily()

getKeyBounds

public AbstractBounds<RowPosition> getKeyBounds(QueryOptions options)
                                         throws InvalidRequestException

May be used by custom QueryHandler implementations

Throws:

InvalidRequestException

getLimit

public int getLimit(QueryOptions options)
             throws InvalidRequestException

May be used by custom QueryHandler implementations

Throws:

InvalidRequestException

getValidatedIndexExpressions

public java.util.List<IndexExpression> getValidatedIndexExpressions(QueryOptions options)
                                                             throws InvalidRequestException

May be used by custom QueryHandler implementations

Throws:

InvalidRequestException

hasClusteringColumnsRestriction

public boolean hasClusteringColumnsRestriction()

May be used by custom QueryHandler implementations

hasPartitionKeyRestriction

public boolean hasPartitionKeyRestriction()

May be used by custom QueryHandler implementations