接口的使用
org.apache.shardingsphere.infra.binder.segment.select.projection.Projection

使用Projection的程序包

程序包	说明
org.apache.shardingsphere.infra.binder.segment.select.projection
org.apache.shardingsphere.infra.binder.segment.select.projection.engine
org.apache.shardingsphere.infra.binder.segment.select.projection.impl

org.apache.shardingsphere.infra.binder.segment.select.projection中Projection的使用

返回变量类型为Projection的类型的org.apache.shardingsphere.infra.binder.segment.select.projection中的方法

限定符和类型	方法和说明
List<Projection>	ProjectionsContext.getExpandProjections() Get expand projections with shorthand projections.

org.apache.shardingsphere.infra.binder.segment.select.projection.engine中Projection的使用

返回变量类型为Projection的类型的org.apache.shardingsphere.infra.binder.segment.select.projection.engine中的方法

限定符和类型	方法和说明
Optional<Projection>	ProjectionEngine.createProjection(org.apache.shardingsphere.sql.parser.sql.common.segment.generic.table.TableSegment table, org.apache.shardingsphere.sql.parser.sql.common.segment.dml.item.ProjectionSegment projectionSegment) Create projection.

org.apache.shardingsphere.infra.binder.segment.select.projection.impl中Projection的使用

实现Projection的org.apache.shardingsphere.infra.binder.segment.select.projection.impl中的类

限定符和类型	类和说明
class	AggregationDistinctProjection Aggregation distinct projection.
class	AggregationProjection Aggregation projection.
class	ColumnProjection Common projection.
class	DerivedProjection Derived projection.
class	ExpressionProjection Expression projection.
class	ParameterMarkerProjection ParameterMarker projection.
class	ShorthandProjection Shorthand projection.
class	SubqueryProjection Subquery projection.