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Abhishek Gupta for AWS

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[20 Days of DynamoDB] Day 4 - Conditional UpdateItem

Posted: 11/Jan/2024

Conditional operations are helpful in cases when you want a DynamoDB write operation (PutItem, UpdateItem or DeleteItem) to be executed based on a certain criteria. To do so, use a condition expression - it must evaluate to true in order for the operation to succeed.

Here is an example that demonstrates a conditional UpdateItem operation. It uses the attribute_not_exists function:

    resp, err := client.UpdateItem(context.Background(), &dynamodb.UpdateItemInput{
        TableName: aws.String(tableName),
        Key: map[string]types.AttributeValue{
            "email": &types.AttributeValueMemberS{Value: email},
        UpdateExpression: aws.String("SET first_name = :fn"),
        ExpressionAttributeValues: map[string]types.AttributeValue{
            ":fn": &types.AttributeValueMemberS{
                Value: firstName,

        ConditionExpression:    aws.String("attribute_not_exists(account_locked)"),
        ReturnConsumedCapacity: types.ReturnConsumedCapacityTotal,
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Recommended reading - ConditionExpressions

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