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
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- 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
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(Since version 9)