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vendor/github.com/aws/aws-sdk-go/example/service/dynamodb/scanItems/README.md

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+# Example
+
+`scanItems` is an example how to use Amazon DynamoDB's Scan API operation with the SDK's `dynamodbattributes.UnmarshalListOfMaps` to unmarshal the Scan response's `Items` `[]map[string]*dynamodb.AttributeValue` field. This unmarshaler can be used with all `[]map[string]*dynamodb.AttributeValue` type fields.
+
+## Go Type
+
+The `Item` time will be used by the example to unmarshal the DynamoDB table's items to.
+
+```go
+type Item struct {
+	Key  int
+	Desc string
+	Data map[string]interface{}
+}
+```
+Use Go tags to define what the name is of the attribute in your DynamoDB table. See [AWS SDK for Go API Reference: Marshal](https://docs.aws.amazon.com/sdk-for-go/api/service/dynamodb/dynamodbattribute/#Marshal) for more information.
+
+In DynamoDB the structure of the item to be returned will be:
+```json
+{
+  "Data": {
+    "Value 1": "abc",
+    "Value 2": 1234567890
+  },
+  "Desc": "First ddb item",
+  "Key": 1
+}
+```
+
+## Usage
+
+`go run -tags example scanItems.go -table "<table_name>" -region "<optional_region>"`
+
+## Output
+
+```
+0: Key: 123, Desc: An item in the DynamoDB table
+	Num Data Values: 0
+1: Key: 2, Desc: Second ddb item
+	Num Data Values: 2
+	- "A Field": 123
+	- "Another Field": abc
+2: Key: 1, Desc: First ddb item
+	Num Data Values: 2
+	- "Value 1": abc
+	- "Value 2": 1234567890
+```

vendor/github.com/aws/aws-sdk-go/example/service/dynamodb/scanItems/scanItems.go

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+// +build example
+
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/session"
+	"github.com/aws/aws-sdk-go/service/dynamodb"
+	"github.com/aws/aws-sdk-go/service/dynamodb/dynamodbattribute"
+)
+
+func exitWithError(err error) {
+	fmt.Fprintln(os.Stderr, err)
+	os.Exit(1)
+}
+
+func main() {
+	cfg := Config{}
+	if err := cfg.Load(); err != nil {
+		exitWithError(fmt.Errorf("failed to load config, %v", err))
+	}
+
+	// Create the config specifying the Region for the DynamoDB table.
+	// If Config.Region is not set the region must come from the shared
+	// config or AWS_REGION environment variable.
+	awscfg := &aws.Config{}
+	if len(cfg.Region) > 0 {
+		awscfg.WithRegion(cfg.Region)
+	}
+
+	// Create the session that the DynamoDB service will use.
+	sess := session.Must(session.NewSession(awscfg))
+
+	// Create the DynamoDB service client to make the query request with.
+	svc := dynamodb.New(sess)
+
+	// Build the query input parameters
+	params := &dynamodb.ScanInput{
+		TableName: aws.String(cfg.Table),
+	}
+	if cfg.Limit > 0 {
+		params.Limit = aws.Int64(cfg.Limit)
+	}
+
+	// Make the DynamoDB Query API call
+	result, err := svc.Scan(params)
+	if err != nil {
+		exitWithError(fmt.Errorf("failed to make Query API call, %v", err))
+	}
+
+	items := []Item{}
+
+	// Unmarshal the Items field in the result value to the Item Go type.
+	err = dynamodbattribute.UnmarshalListOfMaps(result.Items, &items)
+	if err != nil {
+		exitWithError(fmt.Errorf("failed to unmarshal Query result items, %v", err))
+	}
+
+	// Print out the items returned
+	for i, item := range items {
+		fmt.Printf("%d: Key: %d, Desc: %s\n", i, item.Key, item.Desc)
+		fmt.Printf("\tNum Data Values: %d\n", len(item.Data))
+		for k, v := range item.Data {
+			fmt.Printf("\t- %q: %v\n", k, v)
+		}
+	}
+}
+
+type Item struct {
+	Key  int
+	Desc string
+	Data map[string]interface{}
+}
+
+type Config struct {
+	Table  string // required
+	Region string // optional
+	Limit  int64  // optional
+
+}
+
+func (c *Config) Load() error {
+	flag.Int64Var(&c.Limit, "limit", 0, "Limit is the max items to be returned, 0 is no limit")
+	flag.StringVar(&c.Table, "table", "", "Table to Query on")
+	flag.StringVar(&c.Region, "region", "", "AWS Region the table is in")
+	flag.Parse()
+
+	if len(c.Table) == 0 {
+		flag.PrintDefaults()
+		return fmt.Errorf("table name is required.")
+	}
+
+	return nil
+}