com.holonplatform.datastore.jdbc.composer.expression

Interface SQLProjection<R>

Type Parameters:

R - Projection result type

All Superinterfaces:

com.holonplatform.core.Expression, com.holonplatform.core.TypedExpression<R>

All Known Subinterfaces:

SQLProjection.MutableSQLProjection<R>

public interface SQLProjection<R>
extends com.holonplatform.core.TypedExpression<R>

Expression which represents a SQL query projection, providing the selection labels and an optional SQLResultConverter.

Since:

5.1.0

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static interface	SQLProjection.MutableSQLProjection<R> A mutable SQLProjection to configure selection expressions and converter.

Nested classes/interfaces inherited from interface com.holonplatform.core.Expression

com.holonplatform.core.Expression.ExpressionResolverFunction<E extends com.holonplatform.core.Expression,R extends com.holonplatform.core.Expression>, com.holonplatform.core.Expression.InvalidExpressionException

Method Summary

Modifier and Type	Method and Description
static <R> SQLProjection.MutableSQLProjection<R>	create(Class<? extends R> projectionType) Create a new SQLProjection.
static <R> SQLProjection.MutableSQLProjection<R>	create(Class<? extends R> projectionType, int aliasMainSequence) Create a new SQLProjection.
static <R> SQLProjection.MutableSQLProjection<R>	create(Class<? extends R> projectionType, SQLCompositionContext context) Create a new SQLProjection.
Optional<SQLResultConverter<R>>	getConverter() Get the SQL result converter to be used with this projection, if available.
List<String>	getSelection() Get the projection selection names.
Optional<String>	getSelectionAlias(String selection) Get the alias for given projection selection name, if defined.

Methods inherited from interface com.holonplatform.core.TypedExpression

getTemporalType, getType, isCollectionExpression, isConverterExpression

Methods inherited from interface com.holonplatform.core.Expression

validate

Method Detail

getSelection

List<String> getSelection()

Get the projection selection names.

Returns:

Projection selection names

getSelectionAlias

Optional<String> getSelectionAlias(String selection)

Get the alias for given projection selection name, if defined.

Parameters:

selection - Selection name

Returns:

Selection alias, an empty Optional if not available

getConverter

Optional<SQLResultConverter<R>> getConverter()

Get the SQL result converter to be used with this projection, if available.

Returns:

Optional projection SQLResultConverter

create

static <R> SQLProjection.MutableSQLProjection<R> create(Class<? extends R> projectionType)

Create a new SQLProjection.

Type Parameters:

R - Projection type

Parameters:

projectionType - Projection type (not null)

Returns:

A new SQLProjection.MutableSQLProjection builder to configure selection and converter

create

static <R> SQLProjection.MutableSQLProjection<R> create(Class<? extends R> projectionType,
                                                        int aliasMainSequence)

Create a new SQLProjection.

Type Parameters:

R - Projection type

Parameters:

projectionType - Projection type (not null)

aliasMainSequence - Generated alias main sequence, which will be appended to any generated selection alias name

Returns:

A new SQLProjection.MutableSQLProjection builder to configure selection and converter

create

static <R> SQLProjection.MutableSQLProjection<R> create(Class<? extends R> projectionType,
                                                        SQLCompositionContext context)

Create a new SQLProjection.

Type Parameters:

R - Projection type

Parameters:

projectionType - Projection type (not null)

context - SQL context from which to obtain the generated alias main sequence, which will be appended to any generated selection alias name

Returns:

A new SQLProjection.MutableSQLProjection builder to configure selection and converter