case class Expression(expression: String, attributeNames: Map[String, String], attributeValues: Map[String, AttributeValue]) extends Product with Serializable

Abstraction over DynamoDB expressions, this can be key condition expression, update expression, projection expression etc.. https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Expressions.html.

It is recommended to avoid DynamoDB's reserved words in expression string by providing expression as raw String with attribute names and values as placeholders only. Attribute names and values can then be replaced separately via attributeNames and attributeValues maps.

Example:

import meteor.Expression
import meteor.syntax._

Expression(
  "#b = :my_bool and #i > :my_int",
  Map("#b" -> "my_bool_attribute_name", "#i" -> "my_int_attribute_name"),
  Map(
    ":my_bool" -> true.asAttributeValue,
    ":my_int" -> 0.asAttributeValue
  )
)
expression

expression as raw String

attributeNames

a map of attribute name placeholders in the raw String above to the actual attribute names in the table

attributeValues

a map of attribute value placeholders in the raw String above to the actual attribute values

Linear Supertypes
Serializable, Serializable, Product, Equals, AnyRef, Any
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  1. Expression
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Instance Constructors

  1. new Expression(expression: String, attributeNames: Map[String, String], attributeValues: Map[String, AttributeValue])

    expression

    expression as raw String

    attributeNames

    a map of attribute name placeholders in the raw String above to the actual attribute names in the table

    attributeValues

    a map of attribute value placeholders in the raw String above to the actual attribute values

Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  2. final def ##(): Int
    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  4. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  5. val attributeNames: Map[String, String]
  6. val attributeValues: Map[String, AttributeValue]
  7. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... ) @native() @HotSpotIntrinsicCandidate()
  8. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  9. val expression: String
  10. final def getClass(): Class[_]
    Definition Classes
    AnyRef → Any
    Annotations
    @native() @HotSpotIntrinsicCandidate()
  11. val isEmpty: Boolean
  12. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  13. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  14. val nonEmpty: Boolean
  15. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native() @HotSpotIntrinsicCandidate()
  16. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native() @HotSpotIntrinsicCandidate()
  17. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  18. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  19. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... ) @native()
  20. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

Deprecated Value Members

  1. def finalize(): Unit
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] ) @Deprecated
    Deprecated

Inherited from Serializable

Inherited from Serializable

Inherited from Product

Inherited from Equals

Inherited from AnyRef

Inherited from Any

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