Package com.google.cloud.spanner

Class Key

java.lang.Object

com.google.cloud.spanner.Key

All Implemented Interfaces:

Serializable

public final class Key
extends Object
implements Serializable

Represents a row key in a Cloud Spanner table or index. A key is a tuple of values constrained to the scalar Cloud Spanner types: currently these are BOOLEAN, INT64, FLOAT64, STRING, BYTES and TIMESTAMP. Values may be null where the table definition permits it.

Key is used to define the row, or endpoints of a range of rows, to retrieve in read operations or to delete in a mutation.

Key instances are immutable.

See Also:

• Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	Key.Builder	Builder for Key instances.

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object o)
Iterable<Object>	getParts()	Returns the parts in this key.
int	hashCode()
static Key.Builder	newBuilder()	Returns a new builder for constructing a key.
static Key	of(Object... values)	Construct a key with parts specified by values.
int	size()	Returns the number of parts in this key, including null values.
Key.Builder	toBuilder()	Returns a builder initialized with the value of this key.
String	toString()

Methods inherited from class java.lang.Object

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

Method Details

of

public static Key of(Object... values)

Construct a key with parts specified by values. Each object in values must be either null or one of the following supported types:

• Boolean for the BOOL Cloud Spanner type
• Integer, Long for the INT64 Cloud Spanner type
• Float, Double for the FLOAT64 Cloud Spanner type
• BigDecimal for the NUMERIC Cloud Spanner type
• String for the STRING Cloud Spanner type
• String for the JSON Cloud Spanner type
• ByteArray for the BYTES Cloud Spanner type
• Timestamp for the TIMESTAMP Cloud Spanner type
• Date for the DATE Cloud Spanner type

Throws:

IllegalArgumentException - if any member of values is not a supported type

newBuilder

public static Key.Builder newBuilder()

Returns a new builder for constructing a key.

size

public int size()

Returns the number of parts in this key, including null values.

getParts

public Iterable<Object> getParts()

Returns the parts in this key. Each part is represented by the corresponding Cloud Spanner type's canonical Java type, as listed below. Note that other types supported by of(Object...) are converted to one of the canonical types.

• BOOL is represented by Boolean
• INT64 is represented by Long
• FLOAT64 is represented by Double
• NUMERIC is represented by BigDecimal
• STRING is represented by String
• JSON is represented by String
• BYTES is represented by ByteArray
• TIMESTAMP is represented by Timestamp
• DATE is represented by Date

Returns:

an unmodifiable list containing the key parts

toBuilder

public Key.Builder toBuilder()

Returns a builder initialized with the value of this key.

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object