HOW TO：顯示 LINQ to SQL 命令 (LINQ to SQL)
使用 GetCommand，可以顯示 SQL 命令和其他資訊。
範例
在下列範例中，主控台視窗會顯示查詢的輸出，後面依序接著產生的 SQL 命令、命令的型別，以及連接的型別。
' Imports System.Data.Common
Dim db As New Northwnd("c:\northwnd.mdf")
Dim q = _
From cust In db.Customers _
Where cust.City = "London" _
Select cust
Console.WriteLine("Customers from London:")
For Each z As Customer In q
Console.WriteLine(vbTab & z.ContactName)
Next
Dim dc As DbCommand = db.GetCommand(q)
Console.WriteLine(vbNewLine & "Command Text: " & vbNewLine & dc.CommandText)
Console.WriteLine(vbNewLine & "Command Type: {0}", dc.CommandType)
Console.WriteLine(vbNewLine & "Connection: {0}", dc.Connection)
Console.ReadLine()
// using System.Data.Common;
Northwnd db = new Northwnd(@"c:\northwnd.mdf");
var q =
from cust in db.Customers
where cust.City == "London"
select cust;
Console.WriteLine("Customers from London:");
foreach (var z in q)
{
Console.WriteLine("\t {0}",z.ContactName);
}
DbCommand dc = db.GetCommand(q);
Console.WriteLine("\nCommand Text: \n{0}",dc.CommandText);
Console.WriteLine("\nCommand Type: {0}",dc.CommandType);
Console.WriteLine("\nConnection: {0}",dc.Connection);
Console.ReadLine();
顯示的輸出如下：
Customers from London:
Thomas Hardy
Victoria Ashworth
Elizabeth Brown
Ann Devon
Simon Crowther
Marie Bertrand
Hari Kumar
Dominique Perrier
Command Text:
SELECT [t0].[CustomerID], [t0].[CompanyName], [t0].[ContactName], [t0].[ContactT
itle], [t0].[Address], [t0].[City], [t0].[Region], [t0].[PostalCode], [t0].[Coun
try], [t0].[Phone], [t0].[Fax]
FROM [dbo].[Customers] AS [t0]
WHERE [t0].[City] = @p0
Command Type: Text
Connection: System.Data.SqlClient.SqlConnection