org.hsqldb

Class ExpressionColumn

java.lang.Object

org.hsqldb.Expression

org.hsqldb.ExpressionColumn

All Implemented Interfaces:

java.lang.Cloneable

public class ExpressionColumn
extends Expression

Implementation of column, variable, parameter, etc. access operations.

Since:

1.9.0

Field Summary

Fields

Modifier and Type	Field and Description
static HashMappedList	diagnosticsList
static ExpressionColumn[]	emptyArray
static int	idx_more
static int	idx_number
static int	idx_row_count

Fields inherited from class org.hsqldb.Expression

BINARY, LEFT, RIGHT, TERNARY, UNARY

Method Summary

Modifier and Type	Method and Description
Expression	duplicate()
boolean	equals(Expression other) SIMPLE_COLUMN expressions can be of different Java types
ColumnSchema	getColumn()
byte	getNullability()
java.lang.String	getSQL() For use with CHECK constraints.
OrderedHashSet	getUnkeyedColumns(OrderedHashSet unresolvedSet)
java.lang.Object	getValue(Session session)
boolean	isIndexable(RangeVariable range)
boolean	isUnresolvedParam()
HsqlList	resolveColumnReferences(Session session, RangeGroup rangeGroup, int rangeCount, RangeGroup[] rangeGroups, HsqlList unresolvedSet, boolean acceptsSequences)
void	resolveTypes(Session session, Expression parent)

Methods inherited from class org.hsqldb.Expression

checkValidCheckConstraint, equals, getAggregatedValue, getCondition, getConstantValueNoCheck, getResult, getRowValue, getSubqueries, getTable, getType, hasCondition, hashCode, isCorrelated, isFalse, isTrue, materialise, resolveCheckOrGenExpression, resolveColumnReferences, setCollation, setCondition, testCondition, updateAggregatingValue

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, toString, wait, wait, wait

Field Detail

emptyArray

public static final ExpressionColumn[] emptyArray

diagnosticsList

public static final HashMappedList diagnosticsList

idx_number

public static final int idx_number

See Also:

Constant Field Values

idx_more

public static final int idx_more

See Also:

Constant Field Values

idx_row_count

public static final int idx_row_count

See Also:

Constant Field Values

Method Detail

getNullability

public byte getNullability()

getColumn

public ColumnSchema getColumn()

Overrides:

getColumn in class Expression

resolveColumnReferences

public HsqlList resolveColumnReferences(Session session,
                                        RangeGroup rangeGroup,
                                        int rangeCount,
                                        RangeGroup[] rangeGroups,
                                        HsqlList unresolvedSet,
                                        boolean acceptsSequences)

Overrides:

resolveColumnReferences in class Expression

resolveTypes

public void resolveTypes(Session session,
                         Expression parent)

Overrides:

resolveTypes in class Expression

getValue

public java.lang.Object getValue(Session session)

Overrides:

getValue in class Expression

getSQL

public java.lang.String getSQL()

Description copied from class: Expression

For use with CHECK constraints. Under development. Currently supports a subset of expressions and is suitable for CHECK search conditions that refer only to the inserted/updated row. For full DDL reporting of VIEW select queries and CHECK search conditions, future improvements here are dependent upon improvements to SELECT query parsing, so that it is performed in a number of passes. An early pass should result in the query turned into an Expression tree that contains the information in the original SQL without any alterations, and with tables and columns all resolved. This Expression can then be preserved for future use. Table and column names that are not user-defined aliases should be kept as the HsqlName structures so that table or column renaming is reflected in the precompiled query.

Overrides:

getSQL in class Expression

getUnkeyedColumns

public OrderedHashSet getUnkeyedColumns(OrderedHashSet unresolvedSet)

Overrides:

getUnkeyedColumns in class Expression

equals

public boolean equals(Expression other)

SIMPLE_COLUMN expressions can be of different Java types

Overrides:

equals in class Expression

isIndexable

public boolean isIndexable(RangeVariable range)

Overrides:

isIndexable in class Expression

isUnresolvedParam

public boolean isUnresolvedParam()

duplicate

public Expression duplicate()

Overrides:

duplicate in class Expression