Session.GetObjectsFromQuery<T>(List<XPMemberInfo>, String, String[], Object[]) 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.v19.2.dll

Declaration

C#

public ICollection<T> GetObjectsFromQuery<T>(
    List<XPMemberInfo> members,
    string sql,
    string[] parameterNames,
    object[] parameterValues
)

VB.NET

Public Function GetObjectsFromQuery(Of T)(
    members As List(Of XPMemberInfo),
    sql As String,
    parameterNames As String(),
    parameterValues As Object()
) As ICollection(Of T)

Parameters

Name	Type	Description
members	List<XPMemberInfo>	A list of XPMemberInfo objects representing object members that are mapped to the query’s result set columns. The order of list elements should correspond to the order of result set columns.
sql	String	A String value that specifies an SQL query.
parameterNames	String[]	An array of strings specifying parameterValues parameter names.
parameterValues	Object[]	An array of objects specifying parameters to pass to the database server along with the query.

Type Parameters

Name
T

Returns

Type	Description
ICollection<T>	A collection of non-persistent objects of the specified type that are instantiated with data obtained via the specified SQL query.

Remarks

This method performs the following:

• Executes the specified SQL query and obtains the query result as a result set.
• Creates objects of the specified type and instantiates them with the result set’s data, based on the mapping information passed as the members parameter. 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 array includes any of the following:

• 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 queries in XPO and retrieving objects from query results, refer to Direct SQL Queries.