When working with both the elastic database client library and the Dapper APIs, you want to retain the following properties: This ensures that all the validation takes place and connections are managed properly when any data moves between shards. Instead of using the traditional way to create connections for Dapper, you need to use the OpenConnectionForKey method. When shard management operations could impact the shardlet, this allows the shard map functionality to automatically kill a database connection. To do so, the shard maps broker the database connections for an application built with the library. The shard map manager protects users from inconsistent views into shardlet data that can occur when concurrent shardlet management operations are happening on the databases. This capability is referred to as data-dependent routing. The shard map also serves as the broker of database connections for requests that carry a sharding key. This capability is called shard map management. The mapping of sharding key values to the databases is stored by a shard map provided by the library’s APIs. You can have as many databases as you need and distribute your shardlets across these databases. With the elastic database client library, you define partitions of your application data called shardlets, map them to databases, and identify them by sharding keys. A quick look at the elastic database client library For the Dapper extensions, see DapperExtensions. To get the Dapper assemblies, see Dapper dot net. This helps interact with the elastic database client library which brokers database connections based on the mapping of shardlets to databases. Extensions methods such as GetList or Insert over the database connection create the SQL statements behind the scenes.Īnother benefit of Dapper and also DapperExtensions is that the application controls the creation of the database connection. When using DapperExtensions, you no longer need to provide the SQL statements. NET objects using Query calls from Dapper. NET objects and the parameters of SQL statements for Execute calls, or to consume the results of your SQL queries into. For instance, Dapper makes it easy to map between your. The mapper functionality in Dapper provides extension methods on database connections that simplify submitting T-SQL statements for execution or querying the database.
#The dapper how to#
The second part of the sample code illustrates how to integrate when using both Dapper and DapperExtensions. The first part of the sample code illustrates how you can integrate the elastic database client library with Dapper-based applications. NET objects from your application to a relational database (and vice versa). Dapper overviewĭapper is an object-relational mapper. This limits changes in your application to only where new connections are created and opened. Your applications can use data-dependent routing by changing the creation and opening of new SqlConnection objects to use the OpenConnectionForKey call from the client library.
Integrating Dapper and DapperExtensions with the elastic database client library for Azure SQL Database is easy. Sample Code: Elastic database tools for Azure SQL Database - Dapper integration. Our focus is on composing the elastic database shard management and data-dependent routing with Dapper. This document illustrates the changes in Dapper-based applications that are necessary to integrate with elastic database tools.
This document is for developers that rely on Dapper to build applications, but also want to embrace elastic database tooling to create applications that implement sharding to scale out their data tier.
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