Class Field<T>

java.lang.Object

org.tentackle.dbms.dsl.Field<T>

Type Parameters:

T - the java type of the column

All Implemented Interfaces:

Expression<T>, SqlElement

public class Field<T>
extends Object
implements Expression<T>

A column of a table.

The name of a field is the column name as defined in the model, i.e. without the suffix of the second and following columns of a multi-column datatype (see DataType.getColumnSuffix(Backend, int)). The suffixes are added while rendering.

Author:

harald

Constructor Summary

Constructors

Constructor	Description
Field(Table table, String name, DataType<T> dataType)	Creates a field.

Method Summary

Modifier and Type	Method	Description
String	getColumnName(Backend backend, int columnIndex)	Gets the name of one of the columns of this field.
DataType<T>	getDataType()	Gets the datatype of this expression.
String	getName()	Gets the column name.
Table	getTable()	Gets the table this field belongs to.
void	render(RenderContext context, int columnIndex)	Renders a single column of this expression.

Methods inherited from class Object

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

Methods inherited from interface Expression

as, asc, between, desc, eq, eq, ge, ge, getAlias, getColumnCount, gt, gt, in, in, isNotNull, isNull, le, le, like, lt, lt, ne, ne, notBetween, notIn, notIn, notLike, render

Constructor Details

Field

public Field(Table table,
 String name,
 DataType<T> dataType)

Creates a field.

Parameters:

table - the table, null if unqualified

name - the column name

dataType - the datatype, null if untyped

Method Details

getTable

public Table getTable()

Gets the table this field belongs to.

Returns:

the table, null if unqualified

getName

public String getName()

Gets the column name.

Returns:

the name, without the suffix of multi-column datatypes

getColumnName

public String getColumnName(Backend backend,
 int columnIndex)

Gets the name of one of the columns of this field.

Parameters:

backend - the backend

columnIndex - the column index, 0 for the first column

Returns:

the column name, suffixed for the second and following columns

getDataType

public DataType<T> getDataType()

Description copied from interface: Expression

Gets the datatype of this expression.

Specified by:

getDataType in interface Expression<T>

Returns:

the datatype, null if untyped

render

public void render(RenderContext context,
 int columnIndex)

Description copied from interface: Expression

Renders a single column of this expression.

Specified by:

render in interface Expression<T>

Parameters:

context - the render context

columnIndex - the column index, 0 for the first column