Condition keys for row-level security in DynamoDB

Introduction

Condition keys help control who can see or change each row in a database table. They keep data safe by checking rules for every row.

When you want each user to access only their own data in a shared table.

When you need to limit data changes to certain users based on their role.

When you want to protect sensitive information from unauthorized users.

When building apps where data privacy is important for each record.

When you want to enforce security rules directly in the database.

Syntax

DynamoDB

ConditionKeyName = :value

Example: userId = :currentUserId

Condition keys are used in IAM policies or DynamoDB expressions to check row values.

They compare a row's attribute to a value to allow or deny access.

Examples

Allows access only if the row's userId matches the current user's ID.

DynamoDB

userId = :currentUserId

Allows access only to rows where the department matches the user's department.

DynamoDB

department = :userDepartment

Allows access only to rows with status marked as active.

DynamoDB

status = :activeStatus

Sample Program

This query returns only the rows where the userId matches the current user's ID, enforcing row-level security.

DynamoDB

SELECT * FROM "Employees" WHERE userId = :currentUserId

Important Notes

Condition keys must match attribute names in your table exactly.

Use placeholders like :currentUserId to safely pass user-specific values.

Row-level security helps keep data private without extra code in your app.

Summary

Condition keys check each row's data to control access.

They are simple rules comparing row attributes to user values.

Using them helps keep data safe and private for each user.