org.h2.command.dml

类 SelectListColumnResolver

java.lang.Object

org.h2.command.dml.SelectListColumnResolver

所有已实现的接口:

ColumnResolver

public class SelectListColumnResolver
extends Object
implements ColumnResolver

This class represents a column resolver for the column list of a SELECT statement. It is used to resolve select column aliases in the HAVING clause. Example:

SELECT X/3 AS A, COUNT(*) FROM SYSTEM_RANGE(1, 10) GROUP BY A HAVING A>2;

作者:

Thomas Mueller

方法概要

限定符和类型	方法和说明
Column[]	getColumns() Get the column list.
Column	getRowIdColumn() Get the row id pseudo column, if there is one.
String	getSchemaName() Get the schema name.
Select	getSelect() Get the select statement.
Column[]	getSystemColumns() Get the list of system columns, if any.
String	getTableAlias() Get the table alias.
TableFilter	getTableFilter() Get the table filter.
Value	getValue(Column column) Get the value for the given column.
Expression	optimize(ExpressionColumn expressionColumn, Column column) Get the expression that represents this column.

从类继承的方法 java.lang.Object

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

方法详细资料

getColumns

public Column[] getColumns()

从接口复制的说明: ColumnResolver

Get the column list.

指定者:

getColumns 在接口中 ColumnResolver

返回:

the column list

getSchemaName

public String getSchemaName()

从接口复制的说明: ColumnResolver

Get the schema name.

指定者:

getSchemaName 在接口中 ColumnResolver

返回:

the schema name

getSelect

public Select getSelect()

从接口复制的说明: ColumnResolver

Get the select statement.

指定者:

getSelect 在接口中 ColumnResolver

返回:

the select statement

getSystemColumns

public Column[] getSystemColumns()

从接口复制的说明: ColumnResolver

Get the list of system columns, if any.

指定者:

getSystemColumns 在接口中 ColumnResolver

返回:

the system columns or null

getRowIdColumn

public Column getRowIdColumn()

从接口复制的说明: ColumnResolver

Get the row id pseudo column, if there is one.

指定者:

getRowIdColumn 在接口中 ColumnResolver

返回:

the row id column or null

getTableAlias

public String getTableAlias()

从接口复制的说明: ColumnResolver

Get the table alias.

指定者:

getTableAlias 在接口中 ColumnResolver

返回:

the table alias

getTableFilter

public TableFilter getTableFilter()

从接口复制的说明: ColumnResolver

Get the table filter.

指定者:

getTableFilter 在接口中 ColumnResolver

返回:

the table filter

getValue

public Value getValue(Column column)

从接口复制的说明: ColumnResolver

Get the value for the given column.

指定者:

getValue 在接口中 ColumnResolver

参数:

column - the column

返回:

the value

optimize

public Expression optimize(ExpressionColumn expressionColumn,
                           Column column)

从接口复制的说明: ColumnResolver

Get the expression that represents this column.

指定者:

optimize 在接口中 ColumnResolver

参数:

expressionColumn - the expression column

column - the column

返回:

the optimized expression