org.apache.flink.table.api

类 TableSchema

java.lang.Object

org.apache.flink.table.api.TableSchema

@PublicEvolving
public class TableSchema
extends Object

A table schema that represents a table's structure with field names and types.

嵌套类概要

嵌套类

限定符和类型	类和说明
static class	TableSchema.Builder Builder for creating a TableSchema.

构造器概要

构造器

构造器和说明
TableSchema(String[] fieldNames, org.apache.flink.api.common.typeinfo.TypeInformation<?>[] fieldTypes)

方法概要

限定符和类型	方法和说明
static TableSchema.Builder	builder()
TableSchema	copy() Returns a deep copy of the table schema.
boolean	equals(Object o)
static TableSchema	fromTypeInfo(org.apache.flink.api.common.typeinfo.TypeInformation<?> typeInfo) Creates a table schema from a TypeInformation instance.
String[]	getColumnNames() 已过时。 Use getFieldNames() instead. Can be dropped after 1.7.
int	getFieldCount() Returns the number of fields.
Optional<String>	getFieldName(int fieldIndex) Returns the specified name for the given field index.
String[]	getFieldNames() Returns all field names as an array.
Optional<org.apache.flink.api.common.typeinfo.TypeInformation<?>>	getFieldType(int fieldIndex) Returns the specified type information for the given field index.
Optional<org.apache.flink.api.common.typeinfo.TypeInformation<?>>	getFieldType(String fieldName) Returns the specified type information for the given field name.
org.apache.flink.api.common.typeinfo.TypeInformation<?>[]	getFieldTypes() Returns all field type information as an array.
org.apache.flink.api.common.typeinfo.TypeInformation<?>[]	getTypes() 已过时。 Use getFieldTypes() instead. Can be dropped after 1.7.
int	hashCode()
org.apache.flink.api.common.typeinfo.TypeInformation<org.apache.flink.types.Row>	toRowType() Converts a table schema into a (nested) type information describing a Row.
String	toString()

从类继承的方法 java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

构造器详细资料

TableSchema

public TableSchema(String[] fieldNames,
                   org.apache.flink.api.common.typeinfo.TypeInformation<?>[] fieldTypes)

方法详细资料

copy

public TableSchema copy()

Returns a deep copy of the table schema.

getFieldTypes

public org.apache.flink.api.common.typeinfo.TypeInformation<?>[] getFieldTypes()

Returns all field type information as an array.

getFieldType

public Optional<org.apache.flink.api.common.typeinfo.TypeInformation<?>> getFieldType(int fieldIndex)

Returns the specified type information for the given field index.

参数:

fieldIndex - the index of the field

getFieldType

public Optional<org.apache.flink.api.common.typeinfo.TypeInformation<?>> getFieldType(String fieldName)

Returns the specified type information for the given field name.

参数:

fieldName - the name of the field

getFieldCount

public int getFieldCount()

Returns the number of fields.

getFieldNames

public String[] getFieldNames()

Returns all field names as an array.

getFieldName

public Optional<String> getFieldName(int fieldIndex)

Returns the specified name for the given field index.

参数:

fieldIndex - the index of the field

getTypes

@Deprecated
public org.apache.flink.api.common.typeinfo.TypeInformation<?>[] getTypes()

已过时。 Use getFieldTypes() instead. Can be dropped after 1.7.

getColumnNames

@Deprecated
public String[] getColumnNames()

已过时。 Use getFieldNames() instead. Can be dropped after 1.7.

toRowType

public org.apache.flink.api.common.typeinfo.TypeInformation<org.apache.flink.types.Row> toRowType()

Converts a table schema into a (nested) type information describing a Row.

toString

public String toString()

覆盖:

toString 在类中 Object

equals

public boolean equals(Object o)

覆盖:

equals 在类中 Object

hashCode

public int hashCode()

覆盖:

hashCode 在类中 Object

fromTypeInfo

public static TableSchema fromTypeInfo(org.apache.flink.api.common.typeinfo.TypeInformation<?> typeInfo)

Creates a table schema from a TypeInformation instance. If the type information is a CompositeType, the field names and types for the composite type are used to construct the TableSchema instance. Otherwise, a table schema with a single field is created. The field name is "f0" and the field type the provided type.

参数:

typeInfo - The TypeInformation from which the table schema is generated.

返回:

The table schema that was generated from the given TypeInformation.

builder

public static TableSchema.Builder builder()