org.h2.expression

Class TableFunction

java.lang.Object

org.h2.expression.Expression

org.h2.expression.Function

org.h2.expression.TableFunction

All Implemented Interfaces:

FunctionCall

public class TableFunction
extends Function

Implementation of the functions TABLE(..) and TABLE_DISTINCT(..).

Field Summary

Fields inherited from class org.h2.expression.Function

ABS, ACOS, args, ARRAY_GET, ARRAY_LENGTH, ASCII, ASIN, ATAN, ATAN2, AUTOCOMMIT, BIT_LENGTH, BITAND, BITOR, BITXOR, CANCEL_SESSION, CASE, CASEWHEN, CAST, CEILING, CHAR, CHAR_LENGTH, COALESCE, COMPRESS, CONCAT, CONVERT, COS, COSH, COT, CSVREAD, CSVWRITE, CURDATE, CURRENT_DATE, CURRENT_TIME, CURRENT_TIMESTAMP, CURRENT_USER, CURRVAL, CURTIME, DATABASE, DATABASE_PATH, DATE_ADD, DATE_DIFF, DAY_NAME, DAY_OF_MONTH, DAY_OF_WEEK, DAY_OF_YEAR, DECRYPT, DEGREES, DIFFERENCE, ENCRYPT, EXP, EXPAND, EXTRACT, FILE_READ, FLOOR, FORMATDATETIME, GREATEST, HASH, HEXTORAW, HOUR, IDENTITY, IFNULL, INSERT, INSTR, ISO_DAY_OF_WEEK, ISO_WEEK, ISO_YEAR, LCASE, LEAST, LEFT, LENGTH, LINK_SCHEMA, LOCATE, LOCK_MODE, LOCK_TIMEOUT, LOG, LOG10, LOWER, LPAD, LTRIM, MEMORY_FREE, MEMORY_USED, MINUTE, MOD, MONTH, MONTH_NAME, NEXTVAL, NOW, NULLIF, NVL2, OCTET_LENGTH, PARSEDATETIME, PI, POSITION, POWER, QUARTER, RADIANS, RAND, RANDOM_UUID, RAWTOHEX, READONLY, REGEXP_REPLACE, REPEAT, REPLACE, RIGHT, ROUND, ROUNDMAGIC, ROW_NUMBER, RPAD, RTRIM, SCHEMA, SCOPE_IDENTITY, SECOND, SECURE_RAND, SESSION_ID, SET, SIGN, SIN, SINH, SOUNDEX, SPACE, SQRT, STRINGDECODE, STRINGENCODE, STRINGTOUTF8, SUBSTR, SUBSTRING, TABLE, TABLE_DISTINCT, TAN, TANH, TRANSACTION_ID, TRIM, TRUNCATE, TRUNCATE_VALUE, UCASE, UPPER, USER, UTF8TOSTRING, WEEK, XMLATTR, XMLCDATA, XMLCOMMENT, XMLNODE, XMLSTARTDOC, XMLTEXT, YEAR, ZERO

Method Summary

Methods

Modifier and Type	Method and Description
protected void	checkParameterCount(int len) Check if the parameter count is correct.
Expression[]	getExpressionColumns(Session session) If this expression consists of column expressions it should return them.
String	getName() Get the name of the function.
long	getRowCount()
String	getSQL() Get the SQL statement of this expression.
Value	getValue(Session session) Return the resulting value for the current row.
ValueResultSet	getValueForColumnList(Session session, Expression[] nullArgs) Get an empty result set with the column names set.
void	setColumns(ArrayList<Column> columns)

Methods inherited from class org.h2.expression.Function

doneWithParameters, getArgs, getCost, getDisplaySize, getFunction, getFunctionType, getParameterCount, getPrecision, getScale, getType, isDatePart, isDeterministic, isEverything, isFast, mapColumns, optimize, setDataType, setEvaluatable, setParameter, updateAggregate

Methods inherited from class org.h2.expression.Expression

addFilterConditions, createIndexConditions, getAlias, getBooleanValue, getColumnName, getExpressionColumns, getNonAliasExpression, getNotIfPossible, getNullable, getSchemaName, getTableAlias, getTableName, isAutoIncrement, isConstant, isValueSet, isWildcard, toString

Methods inherited from class java.lang.Object

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

Method Detail

getValue

public Value getValue(Session session)

Description copied from class: Expression

Return the resulting value for the current row.

Overrides:

getValue in class Function

Parameters:

session - the session

Returns:

the result

checkParameterCount

protected void checkParameterCount(int len)

Description copied from class: Function

Check if the parameter count is correct.

Overrides:

checkParameterCount in class Function

Parameters:

len - the number of parameters set

getSQL

public String getSQL()

Description copied from class: Expression

Get the SQL statement of this expression. This may not always be the original SQL statement, specially after optimization.

Specified by:

getSQL in interface FunctionCall

Overrides:

getSQL in class Function

Returns:

the SQL statement

getName

public String getName()

Description copied from interface: FunctionCall

Get the name of the function.

Specified by:

getName in interface FunctionCall

Overrides:

getName in class Function

Returns:

the name

getValueForColumnList

public ValueResultSet getValueForColumnList(Session session,
                                   Expression[] nullArgs)

Description copied from interface: FunctionCall

Get an empty result set with the column names set.

Specified by:

getValueForColumnList in interface FunctionCall

Overrides:

getValueForColumnList in class Function

Parameters:

session - the session

nullArgs - the argument list (some arguments may be null)

Returns:

the empty result set

setColumns

public void setColumns(ArrayList<Column> columns)

getRowCount

public long getRowCount()

getExpressionColumns

public Expression[] getExpressionColumns(Session session)

Description copied from class: Expression

If this expression consists of column expressions it should return them.

Overrides:

getExpressionColumns in class Expression

Parameters:

session - the session

Returns:

array of expression columns if applicable, null otherwise