.NET Framework 4.5.2+
.NET Framework 4.5.2+
.NET Standard 2.0+

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.v21.1.dll

Declaration

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

Parameters

Name Type Description
members List<XPMemberInfo>

Specifies object members mapped to columns in the resulting set. The order of list elements should correspond to the order of the resulting set columns.

sql String

Specifies an SQL statement.

parameterNames String[]

Specifies parameter names.

parameterValues Object[]

An array of objects specifying parameters to pass to the database server along with the query.

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

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