How do I add multiple filter conditions to a DynamoDB scan operation in Go SDK?

Filtering DynamoDB Scans with Multiple Conditions in Go SDK

When constructing a DynamoDB scan operation with multiple filter conditions, it's essential to consider how these conditions are combined. By default, the built-in expression builder in the AWS SDK for Go overwrites existing conditions when new ones are added. This behavior can be limiting in cases where multiple filters are required for a comprehensive search.

To overcome this limitation and add multiple conditions, the AddCondition method of the ConditionBuilder struct can be utilized. The And , Or , and Not methods allow multiple conditions to be combined logically.

For instance, to filter a scan based on the "foo" field being equal to 5 and the "bar" field being equal to 6, the following code can be used:

<code class="go">cond1 := expression.Name("foo").Equal(expression.Value(5))
cond2 := expression.Name("bar").Equal(expression.Value(6))
expr, err := expression.NewBuilder().
    WithCondition(cond1.And(cond2)).
    Build()
if err != nil {
    fmt.Println(err)
}</code>

This approach allows for the creation of arbitrarily complex filter conditions, ensuring that scans can be tailored to specific requirements. The documentation for the expression builder provides further details on these methods and the supported logical operators.

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