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[20 Days of DynamoDB] Day 14 - Using the DynamoDB expression package to build Key Condition and Filter expressions
Jan. 30, 2024, 4:12 a.m. | Abhishek Gupta
DEV Community dev.to
Posted: 30/Jan/2024
You can use expression package in the AWS Go SDK for DynamoDB to programmatically build key condition and filter expressions and use them with Query API.
Here is an example that queries for a specific thread based on the forum name (partition key) and subject (sort key):
keyConditionBuilder := expression.Key("ForumName").Equal(expression.Value("Amazon DynamoDB"))
filterExpressionBuilder := expression.Name("Views").GreaterThanEqual(expression.Value(3))
expr, _ := expression.NewBuilder().
WithKeyCondition(keyConditionBuilder).
WithFilter(filterExpressionBuilder).
Build()
_, err := client.Query(context.Background(), &dynamodb.QueryInput{
TableName: aws.String("Thread"),
KeyConditionExpression: expr.KeyCondition(),
FilterExpression: expr.Filter(),
ExpressionAttributeNames: expr.Names(),
ExpressionAttributeValues: expr.Values(),
})
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