Sf Update Item

10-update Item code

// handler.ts
import { DynamoDBClient, UpdateItemCommand } from "@aws-sdk/client-dynamodb";

const client = new DynamoDBClient({});

export const handler = async ({
  item: { itemId, quantity },
}: {
  item: { itemId: string; quantity: number };
}): Promise<void> => {
  const tableName = process.env.TABLE_NAME;

  await client.send(
    new UpdateItemCommand({
      TableName: tableName,
      Key: {
        ProductID: { S: itemId },
      },
      UpdateExpression: "SET stock = stock - :quantity",
      ExpressionAttributeValues: {
        ":quantity": { N: quantity.toString() },
      },
    })
  );
};
----
construct
---
  const updateItemStock = new cdk.aws_lambda_nodejs.NodejsFunction(
      this,
      "updateItemStock",
      {
        entry: path.join(__dirname, "updateItemStock", "handler.ts"),
        handler: "handler",
        runtime: cdk.aws_lambda.Runtime.NODEJS_20_X,
        environment: {
          TABLE_NAME: ProductTable.tableName,
        },
      }
    );
    ProductTable.grantReadWriteData(updateItemStock);