org.hsqldb

Class FunctionSQL

java.lang.Object

org.hsqldb.Expression

org.hsqldb.FunctionSQL

All Implemented Interfaces:

java.lang.Cloneable

Direct Known Subclasses:

FunctionCustom

public class FunctionSQL
extends Expression

Implementation of SQL standard function calls

Since:

1.9.0

Field Summary

Fields inherited from class org.hsqldb.Expression

BINARY, LEFT, RIGHT, TERNARY, UNARY

Method Summary

Modifier and Type	Method and Description
java.lang.String	describe(Session session, int blanks) Returns a String representation of this object.
boolean	equals(Expression other)
Expression	getFunctionExpression()
java.lang.String	getSQL() For use with CHECK constraints.
java.lang.Object	getValue(Session session) Evaluates and returns this Function in the context of the session.
int	hashCode()
boolean	isDeterministic()
boolean	isValueFunction()
static FunctionSQL	newSQLFunction(java.lang.String token, ParserDQL.CompileContext context)
void	resolveTypes(Session session, Expression parent)
void	setArguments(Expression[] newNodes)

Methods inherited from class org.hsqldb.Expression

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

Methods inherited from class java.lang.Object

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

Method Detail

newSQLFunction

public static FunctionSQL newSQLFunction(java.lang.String token,
                                         ParserDQL.CompileContext context)

setArguments

public void setArguments(Expression[] newNodes)

getFunctionExpression

public Expression getFunctionExpression()

getValue

public java.lang.Object getValue(Session session)

Evaluates and returns this Function in the context of the session.

Overrides:

getValue in class Expression

resolveTypes

public void resolveTypes(Session session,
                         Expression parent)

Overrides:

resolveTypes 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

equals

public boolean equals(Expression other)

Overrides:

equals in class Expression

hashCode

public int hashCode()

Overrides:

hashCode in class Expression

describe

public java.lang.String describe(Session session,
                                 int blanks)

Returns a String representation of this object.

isDeterministic

public boolean isDeterministic()

isValueFunction

public boolean isValueFunction()