Session.GetObjectsByKeyFromQuery(XPClassInfo, Boolean, String) Method

Returns reloaded persistent objects from a data store, with key property values obtained via the specified SQL query.

Namespace: DevExpress.Xpo

Assembly: DevExpress.Xpo.v18.2.dll

Declaration

C#

public ICollection GetObjectsByKeyFromQuery(
    XPClassInfo classInfo,
    bool alwaysGetFromDataStore,
    string sql
)

VB.NET

Public Function GetObjectsByKeyFromQuery(
    classInfo As XPClassInfo,
    alwaysGetFromDataStore As Boolean,
    sql As String
) As ICollection

Parameters

Name	Type	Description
classInfo	XPClassInfo	An XPClassInfo object which contains the metadata information of the persistent objects that are retrieved, based on the query’s result set.
alwaysGetFromDataStore	Boolean	true to reload persistent objects from storage, if they are found in memory; otherwise, false.
sql	String	A String value that specifies a SQL query.

Returns

Type	Description
ICollection	A collection of persistent objects with specified key property values.

Remarks

First, the GetObjectsByKeyFromQuery method executes the specified SQL query and retrieves key property values into a result set. Then, the method searches in memory for persistent objects with retrieved key property values. If such objects are found, they are not reloaded. To get the up-to-date objects from storage, the alwaysGetFromDb parameter must be set to true.

Note

The GetObjectsByKeyFromQuery method does not find objects, until they are saved to a data store.

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