DynamoDB Update

Overview

The DynamoDB Update Snap updates data in a DynamoDB table.

The table becomes suggestible once the account is defined.

Supported Accounts

Prerequisites

None.

Snap views

Type Description Examples of upstream and downstream Snaps
Input

This Snap has exactly one document input view.

Expected input: The table's key schema is suggested on input view. The attribute values for the attributes of the key of the record are passed from input view.

Output

This Snap has exactly one document output view.

Expected output: This Snap provides the updated record for each input record. Errors can be routed to the error view if enabled or cause the Snap to fail during execution.

Learn more about Error handling.

Snap settings

Note: Learn about the common controls in the Snap settings dialog.
Field/Field set Description

Label

String
Required.Specify a unique name for the Snap. Modify this to be more appropriate, especially if there are more than one of the same Snap in the pipeline.

Default value: DynamoDB Update

Table name

String/Expression/ Suggestion
Required. The name of the table to write the data into. This property is suggestible, which shows the list of the tables in the database.

Default value: None

Example: Thread

Update expression

String/Expression
An expression that defines one or more attributes to be updated.

Default value: None

Example: set LastPostDateTime = :val1

Conditional expression

String/Expression
A condition that must be satisfied in order for the update to succeed.

Default value: None

Example: LastPostDateTime = :val1

Expression attribute values

Specify the placeholders for the Expression Attribute Names and/or Expression Attribute Values.

Example: If your table contains a column named UUID (a reserved word) and you want to update a value in the UUID column, then you must assign a placeholder for the column name because you cannot use a reserved word directly in your expression. You can define the Attribute #u, leave the Type blank, and enter the value as UUID. In the Snap Update expression condition, enter Set #u=:val1. :val1 is the placeholder for the value in the table which is defined as Attribute :val1 of Type B with ValuedGhpcyB0ZXh0I

Note: DynamoDB reserves certain words and they are called reserved words. You must not use reserved words as attribute names in expressions. If you must write an expression that contains a word that conflicts with a DynamoDB reserved word, then you can define an expression attribute name to use in the place of the reserved word. For more information, see Expression Attribute Names. Similarly, you cannot use certain values as attribute values in expressions and instead must define an expression attribute name. For more information, see Expression Attribute Values.
Attribute

String/Expression
The expression attribute name. Begins with a # for names and : for values.

Default value: None

Example: :val1, #U

Type

String/Expression
The attribute type. Blank for Expression Attribute Names. S for string, N for number, and so on, for Values.

Default value: None

Example: B

Value

String/Expression
The actual literal to be used in the update condition.

Default value: None

Example: 13, UUID

Snap execution

Dropdown list
Choose one of the three modes in which the Snap executes. Available options are:
  • Validate & Execute: Performs limited execution of the Snap and generates a data preview during pipeline validation. Subsequently, performs full execution of the Snap (unlimited records) during pipeline runtime.
  • Execute only: Performs full execution of the Snap during pipeline execution without generating preview data.
  • Disabled: Disables the Snap and all Snaps that are downstream from it.

Default value: Execute only

DynamoDB complex types

DynamoDB supports the following complex types:

Sets

String Set [SS]

A values of this type contains a set of strings delimited by double quotes as follows:

Pattern: [String object 1, String object 2, ........, String Object n]

Example: ["Snaplogic", "San Mateo", "Pipeline"]

Number Set [NS]

A value of this type contains a set of numbers delimited by double quotes as follows:

Pattern: [Number Obj1, Number Object2,...., Number Object n]

Example: ["123", "24.56", "-35", "-21.456","0"]

Binary Set [BS]

A value of this type contains a set of base64-encoded binary data objects delimited by double quotes as follows:

Pattern: [ Binary Object 1, Binary Object 2,...Binary Object n]

Example: ["U3Vubnk=", "UmFpbnk=", "U25vd3k="]

List (L)

A value of this type contains a set of objects. Each object further can be of any type (String, Number, String Set, Map, List etc.,). In general, the List object resembles a JSON array.

Pattern: [ object 1, object 2, ........, Object n]

Example: [{"N":"3"},{"S":"-7.5"},{"B":"U3Vubnk="},{"L":[{"N":"-45.56"},{"M":{"Name":{"S":"ahmed"}}}]}, {"M":{"name":{"S":"syed"}}},{"SS":["a","b"]},{"BS":["U3Vubnk="]},{"NS":["23","45"]}]

Map (M)

A value of this type contains a set of key-value pairs. Keys are always strings, whereas values can be of any type (String, Number, String Set, Map, List etc.,). In general, the Map object resembles a JSON array.

Pattern: {"Key1":Object1, "Key2": Object2......"Keyn": Objectn}

Example: {"id":{"S":"snaplogic"}, "orgs":{"L":[{"S":"uat"}, {"S":"qa"}]}, "admins":{"L":[{"M":{"name":{"S":"a"}}}, {"M":{"name":{"S":"45"}}}]}}

The pipeline using all the Set types for the Update Snap:


Pipeline using Set types


Mapper with Set types


Mapper with Set types


Set types output preview