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SelectQueryFluentBuilder Class

Provides methods that can be chained within a single statement specifying a SelectQuery.

Namespace: DevExpress.DataAccess.Sql

Assembly: DevExpress.DataAccess.v22.2.dll

NuGet Package: DevExpress.DataAccess

Declaration

public sealed class SelectQueryFluentBuilder

The following members return SelectQueryFluentBuilder objects:

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Remarks

A SelectQueryFluentBuilder instance is created by calling the static SelectQueryFluentBuilder.AddTable method.

The chain of methods must end with calling the SelectQueryFluentBuilder.Build method accepting the query name as a parameter.

In the following example, a query selects and orders records from a single data table.

using DevExpress.DataAccess.ConnectionParameters;
using DevExpress.DataAccess.Sql;
// ... 

private SqlDataSource BindToData() {
    // Create a data source with the required connection parameters. 
    Access97ConnectionParameters connectionParameters =
    new Access97ConnectionParameters("../../Data/nwind.mdb", "", "");
    SqlDataSource ds = new SqlDataSource(connectionParameters);

    // Return a list of categories sorted by the number of products in each category. 
    // The chain ends with calling the Build method accepting the query name as a parameter.
    SelectQuery query = SelectQueryFluentBuilder
        .AddTable("Products")
        .SelectColumn("CategoryID")
        .GroupBy("CategoryID")
        .SortBy("ProductID", AggregationType.Count, System.ComponentModel.ListSortDirection.Descending)
        .Filter("[CategoryID] != 8")
        .Build("MyQuery");

    // Add the query to the collection and return the data source. 
    ds.Queries.Add(query);
    return ds;
}

In the following example, a query uses an inner join to select columns from separate data tables sharing a common column key.

using DevExpress.DataAccess.ConnectionParameters;
using DevExpress.DataAccess.Sql;
using DevExpress.Xpo.DB;
// ...

private SqlDataSource BindToData() {
    // Create a data source with the required connection parameters. 
    Access97ConnectionParameters connectionParameters =
    new Access97ConnectionParameters("../../Data/nwind.mdb", "", "");
    SqlDataSource ds = new SqlDataSource(connectionParameters);

    // Join the Categories and Products table by the CategoryID column. 
    // Return the list of categories and the number of products in each category. 
    // Sort the categories by the number of products in them. 
    // The included categories must contain a specific number of products.
    SelectQuery query = SelectQueryFluentBuilder
        .AddTable("Categories")
        .SelectColumn("CategoryName")
        .GroupBy("CategoryName")
        .Join("Products", "CategoryID")
        .SelectColumn("ProductName", AggregationType.Count, "ProductCount")
        .SortBy("ProductName", AggregationType.Count, System.ComponentModel.ListSortDirection.Descending)
        .GroupFilter("[ProductCount] > 7")
        .Build("MyQuery");

    // Add the query to the collection and return the data source. 
    ds.Queries.Add(query);
    return ds;
}

The following code snippets (auto-collected from DevExpress Examples) contain references to the SelectQueryFluentBuilder class.

Note

The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.

Inheritance

Object
SelectQueryFluentBuilder
See Also