Session.ExecuteQuery(String, Object[]) Method

Executes the specified SQL query and returns a result set.

Namespace: DevExpress.Xpo

Assembly: DevExpress.Xpo.v24.2.dll

Declaration

C#

public SelectedData ExecuteQuery(
    string sql,
    object[] parameterValues
)

VB.NET

Public Function ExecuteQuery(
    sql As String,
    parameterValues As Object()
) As SelectedData

Parameters

Name	Type	Description
sql	String	Specifies an SQL statement.
parameterValues	Object[]	An array of objects specifying parameters to pass to the database server along with the query.

Returns

Type	Description
SelectedData	A SelectedData object, specifying the query’s result set.

Remarks

Use ExecuteQuery to query data stores for result sets. You can visualize result sets via the XPDataView. To learn how to access the resulting data, refer to How to: Access Data in SQL Query Results.

The example below demonstrates how to use this method. Here, session is the Session instance.

C#

using DevExpress.Xpo.DB;
// ...
SelectedData data = GetEmployeesSimpleData();
// ...
public SelectedData GetEmployeesSimpleData() {
    const string queryString =
        @"SELECT EmployeeID, (FirstName + ' ' + LastName) as Name, City, Country 
        FROM [Northwind].[dbo].[Employees]
        WHERE City = @p1";
    return session.ExecuteQuery(queryString, new object[] { "London" });
}

VB.NET

Imports DevExpress.Xpo.DB
' ...
Private data As SelectedData = GetEmployeesSimpleData()
' ...
Public Function GetEmployeesSimpleData() As SelectedData
    Const queryString As String = "SELECT EmployeeID, (FirstName + ' ' + LastName) as Name, City, Country 
        FROM [Northwind].[dbo].[Employees]
        WHERE City = @p1"
    Return session.ExecuteQuery(queryString, New Object() { "London" })
End Function

Note that a format of parameter names in a SQL statement depends on the ADO.NET provider and database you use.

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

Note

The ExecuteQuery method sends queries directly, so the correct query syntax depends on a particular database server.