org.apache.flink.table.sources

接口 TableSource<T>

类型参数:

T - The return type of the TableSource.

所有已知子接口:

LookupableTableSource<T>

@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 getProducedDataType() method.

By default, the fields of the TableSchema are implicitly mapped by name to the fields of the produced DataType. 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.
default DataType	getProducedDataType() Returns the DataType for the produced data of the TableSource.
default org.apache.flink.api.common.typeinfo.TypeInformation<T>	getReturnType() 已过时。 This method will be removed in future versions as it uses the old type system. It is recommended to use getProducedDataType() instead which uses the new type system based on DataTypes. Please make sure to use either the old or the new type system consistently to avoid unintended behavior. See the website documentation for more information.
TableSchema	getTableSchema() 已过时。 Table schema is a logical description of a table and should not be part of the physical TableSource. Define schema when registering a Table either in DDL or in TableEnvironment#connect(...).

方法详细资料

getProducedDataType

default DataType getProducedDataType()

Returns the DataType for the produced data of the TableSource.

返回:

The data type of the returned DataSet or DataStream.

getReturnType

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

已过时。 This method will be removed in future versions as it uses the old type system. It is recommended to use getProducedDataType() instead which uses the new type system based on DataTypes. Please make sure to use either the old or the new type system consistently to avoid unintended behavior. See the website documentation for more information.

getTableSchema

@Deprecated
TableSchema getTableSchema()

已过时。 Table schema is a logical description of a table and should not be part of the physical TableSource. Define schema when registering a Table either in DDL or in TableEnvironment#connect(...).

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.