Package org.apache.ignite.internal.processors.query.h2.sql

Class GridSqlSelect

java.lang.Object

org.apache.ignite.internal.processors.query.h2.sql.GridSqlStatement

org.apache.ignite.internal.processors.query.h2.sql.GridSqlQuery

org.apache.ignite.internal.processors.query.h2.sql.GridSqlSelect

All Implemented Interfaces:

GridSqlAst

public class GridSqlSelect
extends GridSqlQuery

Plain SELECT query.

Field Summary

Fields

Modifier and Type	Field	Description
static int	FROM_CHILD
static int	WHERE_CHILD

Fields inherited from class org.apache.ignite.internal.processors.query.h2.sql.GridSqlQuery

LIMIT_CHILD, OFFSET_CHILD, sort

Fields inherited from class org.apache.ignite.internal.processors.query.h2.sql.GridSqlStatement

limit

Constructor Summary

Constructors

Constructor	Description
GridSqlSelect()

Method Summary

Modifier and Type	Method	Description
GridSqlSelect	addColumn(GridSqlAst expression, boolean visible)
int	allColumns()
boolean	canBeLazy()	Used only for SELECT based on UPDATE.
void	canBeLazy(boolean canBeLazy)
<E extends GridSqlAst> E	child(int childIdx)	Get child by index.
<E extends GridSqlAst> void	child(int childIdx, E child)	Set child.
static int	childIndexForColumn(int colIdx)
GridSqlSelect	clearColumns()	Clears select expressions list.
void	collectFromAliases(Set<GridSqlAlias> aliases)	Collect aliases from FROM part.
protected GridSqlAst	column(int col)
List<GridSqlAst>	columns(boolean visibleOnly)
boolean	distinct()
void	distinct(boolean distinct)
GridSqlAst	from()
GridSqlSelect	from(GridSqlAst from)
String	getSQL()
int[]	groupColumns()
GridSqlSelect	groupColumns(int[] grpCols)
GridSqlAst	having()
int	havingColumn()
GridSqlSelect	havingColumn(int col)
GridSqlSelect	setColumn(int colIdx, GridSqlAst expression)
int	size()
boolean	skipMergeTable()
int	visibleColumns()
GridSqlAst	where()
GridSqlSelect	where(GridSqlAst where)
GridSqlSelect	whereAnd(GridSqlAst cond)

Methods inherited from class org.apache.ignite.internal.processors.query.h2.sql.GridSqlQuery

addSort, child, clearSort, getSortLimitSQL, hasOffsetLimit, maskNull, offset, offset, resultType, sort

Methods inherited from class org.apache.ignite.internal.processors.query.h2.sql.GridSqlStatement

explain, explain, limit, limit, toString

Methods inherited from class java.lang.Object

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

Field Detail

FROM_CHILD

public static final int FROM_CHILD

See Also:

Constant Field Values

WHERE_CHILD

public static final int WHERE_CHILD

See Also:

Constant Field Values

Constructor Detail

GridSqlSelect

public GridSqlSelect()

Method Detail

childIndexForColumn

public static int childIndexForColumn(int colIdx)

Parameters:

colIdx - Column index as for column(int).

Returns:

Child index for child(int).

size

public int size()

Returns:

Number of child nodes.

child

public <E extends GridSqlAst> E child(int childIdx)

Get child by index.

Specified by:

child in interface GridSqlAst

Overrides:

child in class GridSqlQuery

Parameters:

childIdx - Index of the requested child.

Returns:

Child element.

child

public <E extends GridSqlAst> void child(int childIdx,
                                         E child)

Set child.

Specified by:

child in interface GridSqlAst

Overrides:

child in class GridSqlQuery

Parameters:

childIdx - Index of the requested child.

child - Child element.

visibleColumns

public int visibleColumns()

Specified by:

visibleColumns in class GridSqlQuery

Returns:

Number of visible columns.

allColumns

public int allColumns()

Returns:

Number of columns is select including invisible ones.

column

protected GridSqlAst column(int col)

Specified by:

column in class GridSqlQuery

Parameters:

col - Column index.

Returns:

Expression for column index.

getSQL

public String getSQL()

Specified by:

getSQL in interface GridSqlAst

Specified by:

getSQL in class GridSqlStatement

Returns:

Generate sql.

skipMergeTable

public boolean skipMergeTable()

Specified by:

skipMergeTable in class GridSqlQuery

Returns:

True if this simple SQL query like 'SELECT A, B, C from SOME_TABLE' without any conditions and expressions.

columns

public List<GridSqlAst> columns(boolean visibleOnly)

Parameters:

visibleOnly - If only visible expressions needed.

Returns:

Select clause expressions.

clearColumns

public GridSqlSelect clearColumns()

Clears select expressions list.

Returns:

this.

addColumn

public GridSqlSelect addColumn(GridSqlAst expression,
                               boolean visible)

Parameters:

expression - Expression.

visible - Expression is visible in select phrase.

Returns:

this.

setColumn

public GridSqlSelect setColumn(int colIdx,
                               GridSqlAst expression)

Parameters:

colIdx - Column index.

expression - Expression.

Returns:

this.

groupColumns

public int[] groupColumns()

Returns:

Group columns.

groupColumns

public GridSqlSelect groupColumns(int[] grpCols)

Parameters:

grpCols - Group columns.

Returns:

this.

from

public GridSqlAst from()

Returns:

Tables.

from

public GridSqlSelect from(GridSqlAst from)

Parameters:

from - From element.

Returns:

this.

distinct

public boolean distinct()

Returns:

Distinct.

distinct

public void distinct(boolean distinct)

Parameters:

distinct - New distinct.

where

public GridSqlAst where()

Returns:

Where.

where

public GridSqlSelect where(GridSqlAst where)

Parameters:

where - New where.

Returns:

this.

whereAnd

public GridSqlSelect whereAnd(GridSqlAst cond)

Parameters:

cond - Adds new WHERE condition using AND operator.

Returns:

this.

having

public GridSqlAst having()

Returns:

Having.

havingColumn

public GridSqlSelect havingColumn(int col)

Parameters:

col - Index of HAVING column.

Returns:

this.

havingColumn

public int havingColumn()

Returns:

Index of HAVING column.

collectFromAliases

public void collectFromAliases(Set<GridSqlAlias> aliases)

Collect aliases from FROM part.

Parameters:

aliases - Table aliases in FROM.

canBeLazy

public void canBeLazy(boolean canBeLazy)

Parameters:

canBeLazy - see canBeLazy().

canBeLazy

public boolean canBeLazy()

Used only for SELECT based on UPDATE. It cannot be lazy when updated columns are used in the conditions. In this case index based on these columns may be chosen to scan and some rows may be updated more than once time.

Returns:

true is lazy flag is applicable.