org.apache.flink.table.sources

接口 TableSource<T>

类型参数:

T - The return type of the TableSource.

@PublicEvolving
public interface TableSource<T>

Defines an external table with the schema that is provided by getTableSchema().

The data of a TableSource is produced as a DataSet in case of a BatchTableSource or as a DataStream in case of a StreamTableSource. The type of ths produced DataSet or DataStream is specified by the getReturnType() method.

By default, the fields of the TableSchema are implicitly mapped by name to the fields of the return type TypeInformation. An explicit mapping can be defined by implementing the DefinedFieldMapping interface.

方法概要

限定符和类型	方法和说明
default String	explainSource() Describes the table source.
org.apache.flink.api.common.typeinfo.TypeInformation<T>	getReturnType() Returns the TypeInformation for the return type of the TableSource.
TableSchema	getTableSchema() Returns the schema of the produced table.

方法详细资料

getReturnType

org.apache.flink.api.common.typeinfo.TypeInformation<T> getReturnType()

Returns the TypeInformation for the return type of the TableSource. The fields of the return type are mapped to the table schema based on their name.

返回:

The type of the returned DataSet or DataStream.

getTableSchema

TableSchema getTableSchema()

Returns the schema of the produced table.

返回:

The TableSchema of the produced table.

explainSource

default String explainSource()

Describes the table source.

返回:

A String explaining the TableSource.