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DynamoDB Deep Dive: NoSQL for Software Engineers

Demo: Reading Data

Practice reading data from the DynamoDB tables.

We'll cover the following...

Creating a table

Uptill now, we have learnt that we can create a table. For this demo, let’s create a table of medicines. We will keep the “chemical formula” as the partition key and the “dosage” as the sort key. The following is a simple code for creating such a table:

Shell
aws dynamodb create-table \
        --table-name Medicines \
        --attribute-definitions AttributeName=ChemicalFormula,AttributeType=S \
                AttributeName=Dosage,AttributeType=N \
        --key-schema AttributeName=ChemicalFormula,KeyType=HASH \
                AttributeName=Dosage,KeyType=RANGE \
        --provisioned-throughput \
                ReadCapacityUnits=4,WriteCapacityUnits=4

Inserting items

Let’s use the bulk-write-item command to insert a few items into our table.

Chemical formula Dosage (mg)
...