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V25.1
  • .NET 8.0+

    Session.GetObjectsFromQuery<T>(String, QueryParameterCollection) Method

    Executes a SQL query and returns its result set as a collection of objects of a non-persistent type specified by the generic type parameter.

    Namespace: DevExpress.Xpo

    Assembly: DevExpress.Xpo.v25.1.dll

    NuGet Package: DevExpress.Xpo

    Declaration

    public ICollection<T> GetObjectsFromQuery<T>(
        string sql,
        QueryParameterCollection parameters
    )

    Parameters

    Name Type Description
    sql String

    Specifies an SQL statement.

    parameters QueryParameterCollection

    Specifies query parameter values.

    Type Parameters

    Name Description
    T

    The type of objects returned by the method. A class that implements this type sould be decorated with NonPersistentAttribute.

    Returns

    Type Description
    ICollection<T>

    A collection of non-persistent objects of the specified type.

    Remarks

    Use QueryParameterCollection to pass strongly-typed parameters. See examples here: Always Encrypted (SQL Server only).

    The connection provider automatically generates sequential parameter names (p0, p1, p2 …). To specify custom parameter names, use the overloaded GetObjectsFromQuery<T>(String, String[], QueryParameterCollection) method.

    This method does the following:

    • Executes the specified SQL query and obtains the query result.
    • Creates objects of the specified type and populates their properties with the resulting set’s data. The members parameter specifies the mapping between columns in the resulting set and object properties. Note that the GetObjectsFromQuery<T> method’s generic type parameter should specify a non-persistent class decorated with a NonPersistentAttribute.
    • Populates a collection with these objects.

    Note

    The GetObjectsFromQuery<T> method throws an exception if the members list includes any of the following object members:

    • A property that is not defined within the T type.
    • A struct type member.
    • A reference to a class with a struct type member.
    • A collection used in object relations.

    To learn more about executing SQL statements in XPO, refer to Direct SQL Queries.

    Note

    The GetObjectsFromQuery method sends statements directly, so the correct statement syntax and parameter names format depends on a particular database server.

    See Also