How to Retrieve Data from Stored Procedures in Entity Framework 6.1.1?

Retrieve Data from Stored Procedures in Entity Framework

When working with dynamic SQL stored procedures using Entity Framework 6.1.1, retrieving data can be a challenge. A common scenario is trying to populate a GridView control using data from a stored procedure, but encountering exceptions due to an empty result set.

To resolve this issue, it is necessary to import the stored procedure as a Function in the Entity model. Follow these steps:

1. Right-click on the workspace area of your Entity model and choose Add -> Function Import.

2. In the Add Function Import dialog, specify the following:

   • Name: A reference name for the stored procedure in the model, e.g., "Search_Products".
   • Function: Select the dynamic SQL stored procedure.
   • Return Value: Choose "Entities" and select "Products" as the return entity type.

3. In the code behind:

   var db = new MyEntities();
   var TEST_SEARCH_TERM = "product";
   var result = db.Search_Products(TEST_SEARCH_TERM); // Search_Products is the name you specified in the Function Import dialog
   
   MyGridView.DataSource = result;
   MyGridView.DataBind();

By importing the stored procedure as a Function, Entity Framework can determine the return type and map it to the appropriate entity. This ensures that the result is an IEnumerable DataSet containing the objects from the stored procedure's SELECT statement, allowing you to populate your GridView successfully.

It is important to note that Entity Framework does not have extensive support for stored procedures due to its focus as an ORM, and the ability to handle stored procedure return values may vary depending on the version of Entity Framework used.

The above is the detailed content of How to Retrieve Data from Stored Procedures in Entity Framework 6.1.1?. For more information, please follow other related articles on the PHP Chinese website!