org.mybatis.dynamic.sql

Class DerivedColumn<T>

java.lang.Object

org.mybatis.dynamic.sql.DerivedColumn<T>

Type Parameters:

T - The Java type that corresponds to this column - not used except for compiler type checking for conditions

All Implemented Interfaces:

BasicColumn, BindableColumn<T>

public class DerivedColumn<T>
extends Object
implements BindableColumn<T>

A derived column is a column that is not directly related to a table. This is primarily used for supporting sub-queries. The main difference in this class and SqlColumn is that this class does not have a related SqlTable and therefore ignores any table qualifier set in a query. If a table qualifier is required it can be set directly in the builder for this class.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	DerivedColumn.Builder<T>

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	DerivedColumn(DerivedColumn.Builder<T> builder)

Method Summary

Modifier and Type	Method and Description
Optional<String>	alias() Returns the columns alias if one has been specified.
DerivedColumn<T>	as(String columnAlias) Override the base method definition to make it more specific to this interface.
Optional<JDBCType>	jdbcType()
static <T> DerivedColumn<T>	of(String name)
static <T> DerivedColumn<T>	of(String name, String tableQualifier)
String	renderWithTableAlias(TableAliasCalculator tableAliasCalculator) Returns the name of the item aliased with a table name if appropriate.
Optional<String>	typeHandler()

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.mybatis.dynamic.sql.BindableColumn

convertParameterType, renderingStrategy

Methods inherited from interface org.mybatis.dynamic.sql.BasicColumn

columnList, renderWithTableAndColumnAlias

Constructor Detail

DerivedColumn

protected DerivedColumn(DerivedColumn.Builder<T> builder)

Method Detail

alias

public Optional<String> alias()

Description copied from interface: BasicColumn

Returns the columns alias if one has been specified.

Specified by:

alias in interface BasicColumn

Returns:

the column alias

jdbcType

public Optional<JDBCType> jdbcType()

Specified by:

jdbcType in interface BindableColumn<T>

typeHandler

public Optional<String> typeHandler()

Specified by:

typeHandler in interface BindableColumn<T>

renderWithTableAlias

public String renderWithTableAlias(TableAliasCalculator tableAliasCalculator)

Description copied from interface: BasicColumn

Returns the name of the item aliased with a table name if appropriate. For example, "a.foo". This is appropriate for where clauses and order by clauses.

Specified by:

renderWithTableAlias in interface BasicColumn

Parameters:

tableAliasCalculator - the table alias calculator for the current renderer

Returns:

the item name with the table alias applied

as

public DerivedColumn<T> as(String columnAlias)

Description copied from interface: BindableColumn

Override the base method definition to make it more specific to this interface.

Specified by:

as in interface BasicColumn

Specified by:

as in interface BindableColumn<T>

Parameters:

columnAlias - the column alias to set

Returns:

new instance with alias set

of

public static <T> DerivedColumn<T> of(String name)

of

public static <T> DerivedColumn<T> of(String name,
                                      String tableQualifier)