com.google.cloud.spanner

Class Struct

java.lang.Object

com.google.cloud.spanner.AbstractStructReader

com.google.cloud.spanner.Struct

All Implemented Interfaces:

StructReader, Serializable

@Immutable
public abstract class Struct
extends AbstractStructReader
implements Serializable

Represents a non-NULL value of Type.Code.STRUCT. Such values are a tuple of named and typed columns, where individual columns may be null. Individual rows from a read or query operation can be considered as structs; ResultSet.getCurrentRowAsStruct() allows an immutable struct to be created from the row that the result set is currently positioned over.

Struct instances are immutable.

This class does not support representing typed NULL Struct values.

However, struct values inside SQL queries are always typed and can be externally supplied to a query only in the form of struct/array-of-struct query parameter values for which typed NULL struct values can be specified in the following ways:

1. As a standalone NULL struct value or as a nested struct field value, constructed using ValueBinder.to(Type, Struct) or Value.struct(Type, Struct).

2. As as a null Struct reference representing a NULL struct typed element value inside an array/list of 'Struct' references, that is used to construct an array-of-struct value using Value.structArray(Type, Iterable) or ValueBinder.toStructArray(Type, Iterable). In this case, the type of the NULL struct value is assumed to be the same as the explicitly specified struct element type of the array/list.

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Struct.Builder Builder for constructing non-NULL Struct instances.

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o)
Struct	getStruct(int columnIndex) TODO(user) : Consider moving these methods to the StructReader interface once STRUCT-typed columns are supported in ResultSet.
Struct	getStruct(String columnName)
protected abstract Struct	getStructInternal(int columnIndex)
int	hashCode()
static Struct.Builder	newBuilder() Returns a builder for creating a non-NULL Struct instance.

Methods inherited from class com.google.cloud.spanner.AbstractStructReader

checkNonNull, getBoolean, getBoolean, getBooleanArray, getBooleanArray, getBooleanArrayInternal, getBooleanInternal, getBooleanList, getBooleanList, getBooleanListInternal, getBytes, getBytes, getBytesInternal, getBytesList, getBytesList, getBytesListInternal, getColumnCount, getColumnIndex, getColumnType, getColumnType, getDate, getDate, getDateInternal, getDateList, getDateList, getDateListInternal, getDouble, getDouble, getDoubleArray, getDoubleArray, getDoubleArrayInternal, getDoubleInternal, getDoubleList, getDoubleList, getDoubleListInternal, getLong, getLong, getLongArray, getLongArray, getLongArrayInternal, getLongInternal, getLongList, getLongList, getLongListInternal, getString, getString, getStringInternal, getStringList, getStringList, getStringListInternal, getStructList, getStructList, getStructListInternal, getTimestamp, getTimestamp, getTimestampInternal, getTimestampList, getTimestampList, getTimestampListInternal, isNull

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.google.cloud.spanner.StructReader

getType, isNull

Method Detail

newBuilder

public static Struct.Builder newBuilder()

Returns a builder for creating a non-NULL Struct instance.

getStruct

public Struct getStruct(int columnIndex)

TODO(user) : Consider moving these methods to the StructReader interface once STRUCT-typed columns are supported in ResultSet.

getStruct

public Struct getStruct(String columnName)

getStructInternal

protected abstract Struct getStructInternal(int columnIndex)

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object