Package org.h2.expression.function.table

Class JavaTableFunction

java.lang.Object

org.h2.expression.function.table.TableFunction

org.h2.expression.function.table.JavaTableFunction

All Implemented Interfaces:

ExpressionWithVariableParameters, NamedExpression, HasSQL

public final class JavaTableFunction
extends TableFunction

This class wraps a user-defined function.

Field Summary

Fields

Modifier and Type	Field	Description
private FunctionAlias	functionAlias
private FunctionAlias.JavaMethod	javaMethod

Fields inherited from class org.h2.expression.function.table.TableFunction

args

Fields inherited from interface org.h2.util.HasSQL

ADD_PLAN_INFORMATION, DEFAULT_SQL_FLAGS, NO_CASTS, QUOTE_ONLY_WHEN_REQUIRED, REPLACE_LOBS_FOR_TRACE, TRACE_SQL_FLAGS

Constructor Summary

Constructors

Constructor	Description
JavaTableFunction(FunctionAlias functionAlias, Expression[] args)

Method Summary

Modifier and Type	Method	Description
java.lang.String	getName()	Get the name.
java.lang.StringBuilder	getSQL(java.lang.StringBuilder builder, int sqlFlags)	Appends the SQL statement of this object to the specified builder.
ResultInterface	getValue(SessionLocal session)	Get a result with.
ResultInterface	getValueTemplate(SessionLocal session)	Get an empty result with the column names set.
boolean	isDeterministic()	Whether the function always returns the same result for the same parameters.
void	optimize(SessionLocal session)	Try to optimize this table function

Methods inherited from class org.h2.expression.function.table.TableFunction

addParameter, doneWithParameters

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.h2.util.HasSQL

getSQL, getTraceSQL

Field Detail

functionAlias

private final FunctionAlias functionAlias

javaMethod

private final FunctionAlias.JavaMethod javaMethod

Constructor Detail

JavaTableFunction

public JavaTableFunction(FunctionAlias functionAlias,
                         Expression[] args)

Method Detail

getValue

public ResultInterface getValue(SessionLocal session)

Description copied from class: TableFunction

Get a result with.

Specified by:

getValue in class TableFunction

Parameters:

session - the session

Returns:

the result

getValueTemplate

public ResultInterface getValueTemplate(SessionLocal session)

Description copied from class: TableFunction

Get an empty result with the column names set.

Specified by:

getValueTemplate in class TableFunction

Parameters:

session - the session

Returns:

the empty result

optimize

public void optimize(SessionLocal session)

Description copied from class: TableFunction

Try to optimize this table function

Overrides:

optimize in class TableFunction

Parameters:

session - the session

getSQL

public java.lang.StringBuilder getSQL(java.lang.StringBuilder builder,
                                      int sqlFlags)

Description copied from interface: HasSQL

Appends the SQL statement of this object to the specified builder.

Specified by:

getSQL in interface HasSQL

Overrides:

getSQL in class TableFunction

Parameters:

builder - string builder

sqlFlags - formatting flags

Returns:

the specified string builder

getName

public java.lang.String getName()

Description copied from interface: NamedExpression

Get the name.

Returns:

the name in uppercase

isDeterministic

public boolean isDeterministic()

Description copied from class: TableFunction

Whether the function always returns the same result for the same parameters.

Specified by:

isDeterministic in class TableFunction

Returns:

true if it does