Package org.h2.table

Interface ColumnResolver

All Known Implementing Classes:

DomainColumnResolver, GeneratedColumnResolver, SelectListColumnResolver, TableFilter, TableValueConstructor.TableValueColumnResolver

public interface ColumnResolver

A column resolver is list of column (for example, a table) that can map a column name to an actual column.

Method Summary

Modifier and Type	Method	Description
Column	findColumn(java.lang.String name)	Get the column with the specified name.
default java.lang.String	getColumnName(Column column)	Get the name of the specified column.
Column[]	getColumns()	Get the column list.
default Column	getRowIdColumn()	Get the row id pseudo column, if there is one.
default java.lang.String	getSchemaName()	Get the schema name or null.
default Select	getSelect()	Get the select statement.
default Column[]	getSystemColumns()	Get the list of system columns, if any.
default java.lang.String	getTableAlias()	Get the table alias.
default TableFilter	getTableFilter()	Get the table filter.
Value	getValue(Column column)	Get the value for the given column.
default boolean	hasDerivedColumnList()	Returns whether this column resolver has a derived column list.
default Expression	optimize(ExpressionColumn expressionColumn, Column column)	Get the expression that represents this column.

Method Detail

getTableAlias

default java.lang.String getTableAlias()

Get the table alias.

Returns:

the table alias

getColumns

Column[] getColumns()

Get the column list.

Returns:

the column list

findColumn

Column findColumn(java.lang.String name)

Get the column with the specified name.

Parameters:

name - the column name, must be a derived name if this column resolver has a derived column list

Returns:

the column with the specified name, or null

getColumnName

default java.lang.String getColumnName(Column column)

Get the name of the specified column.

Parameters:

column - column

Returns:

column name

hasDerivedColumnList

default boolean hasDerivedColumnList()

Returns whether this column resolver has a derived column list.

Returns:

true if this column resolver has a derived column list, false otherwise

getSystemColumns

default Column[] getSystemColumns()

Get the list of system columns, if any.

Returns:

the system columns or null

getRowIdColumn

default Column getRowIdColumn()

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

Returns:

the row id column or null

getSchemaName

default java.lang.String getSchemaName()

Get the schema name or null.

Returns:

the schema name or null

getValue

Value getValue(Column column)

Get the value for the given column.

Parameters:

column - the column

Returns:

the value

getTableFilter

default TableFilter getTableFilter()

Get the table filter.

Returns:

the table filter

getSelect

default Select getSelect()

Get the select statement.

Returns:

the select statement

optimize

default Expression optimize(ExpressionColumn expressionColumn,
                            Column column)

Get the expression that represents this column.

Parameters:

expressionColumn - the expression column

column - the column

Returns:

the optimized expression