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In the preceding example, the ExpressionAttributeNames property specifies the placeholder #title
to represent the Title attribute.The ExpressionAttributeValues property specifies the placeholder
:product to represent the value 18-Bicycle 301.The ConditionExpression property specifies
that #title (Title) must equal :product (18-Bicycle 301).
Additional Resources
For additonal information and code examples, see:
• DynamoDB Series - Expressions
• Accessing Item Attributes with Projection Expressions
• Using Placeholders for Attribute Names and Values
• Specifying Conditions with Condition Expressions
• Modifying Items and Attributes with Update Expressions
• Working with Items Using the AWS SDK for .NET Low-Level API
• Querying Tables Using the AWS SDK for .NET Low-Level API
• Scanning Tables Using the AWS SDK for .NET Low-Level API
• Working with Local Secondary Indexes Using the AWS SDK for .NET Low-Level API
• Working with Global Secondary Indexes Using the AWS SDK for .NET Low-Level API
JSON Support in Amazon DynamoDB with the
AWS SDK for .NET
The AWS SDK for .NET supports JSON data when working with Amazon DynamoDB. This enables you
to more easily get JSON-formatted data from, and insert JSON documents into, DynamoDB tables.
Topics
• Get Data from a DynamoDB Table in JSON Format (p. 63)
• Insert JSON Format Data into a DynamoDB Table (p. 64)
• DynamoDB Data Type Conversions to JSON (p. 64)
• Additional Resources (p. 65)
Get Data from a DynamoDB Table in JSON Format
The following example shows how to get data from a DynamoDB table in JSON format:
// using Amazon.DynamoDBv2;
// using Amazon.DynamoDBv2.DocumentModel;
var client = new AmazonDynamoDBClient();
var table = Table.LoadTable(client, "AnimalsInventory");
var item = table.GetItem(3, "Horse");
var jsonText = item.ToJson();
Console.Write(jsonText);
// Output:
// {"Name":"Shadow","Type":"Horse","Id":3}
var jsonPrettyText = item.ToJsonPretty();
Version v2.0.0
63
AWS SDK for .NET Developer Guide
JSON Support in Amazon DynamoDB
- AWS SDK for .NET 1
- Table of Contents 3
- AWS SDK for .NET Developer 5
- About Amazon Web Services 6
- To sign up for an AWS account 7
- Install the AWS SDK for .NET 8
- Start a New Project 9
- Programming with the AWS SDK 12
- Configuring AWS Credentials 13
- Using the SDK Store 14
- Using a Credentials File 15
- Specifying a Profile 16
- AWS Region Selection 17
- Allowed Elements 23
- Elements Reference 24
- Asynchronous API for .NET 3.5 30
- Examples 31
- No Callback Specified 32
- Simple Callback 32
- Callback with Client 33
- Callback with State Object 33
- Complete Sample 34
- What's Different 38
- Removal of SecureString 39
- Breaking Changes 39
- Configuring the AWS Region 40
- Response and Result Classes 41
- AWS SDK for Windows RT 42
- AWS SDK for Windows Phone 8 42
- Installation 43
- NuGet from Solution Explorer 43
- NuGet Package Manager Console 44
- Programming AWS Services with 45
- Document 54
- Object Persistence 55
- Sample Data 57
- Primary Key 60
- Attributes 62
- Print an Item 62
- DynamoDB 69
- Web.config Options 71
- Creating a Security Group 74
- Enumerating Your Key Pairs 77
- Launching an EC2 Instance 78
- Overview 84
- Prerequisites 84
- High-Level APIs 93
- Get User Account Information 98
- Get Group Information 100
- Get Role Information 101
- Create a User Account 102
- Create a Group 102
- Create a Role 103
- Add a User Account to a Group 104
- Add a Policy to a Group 106
- Add a Policy to a Role 108
- Create an Instance Profile 110
- To test the sample code 113
- Create an IAM Role 114
- SDK for .NET 116
- To create a hosted zone 118
- To monitor update status 120
- Programming Models 121
- Resource APIs 122
- Create an Amazon SQS Client 126
- Create an Amazon SQS Queue 127
- Amazon SQS Queue URLs 127
- Send an Amazon SQS Message 128
- DescriptionService 141
- Version v2.0.0 146
- Additional Services 146
- Additional Resources 153
- Document History 154
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