SqlCommand 類別
定義
重要
部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。
代表一個 Transact-SQL 語句或儲存程序，需對 SQL Server 資料庫執行。 無法繼承這個類別。
public ref class SqlCommand sealed : System::Data::Common::DbCommandpublic ref class SqlCommand sealed : System::ComponentModel::Component, ICloneable, IDisposable, System::Data::IDbCommandpublic ref class SqlCommand sealed : System::Data::Common::DbCommand, ICloneablepublic sealed class SqlCommand : System.Data.Common.DbCommandpublic sealed class SqlCommand : System.ComponentModel.Component, ICloneable, IDisposable, System.Data.IDbCommandpublic sealed class SqlCommand : System.Data.Common.DbCommand, ICloneabletype SqlCommand = class
inherit DbCommandtype SqlCommand = class
inherit Component
interface IDbCommand
interface IDisposable
interface ICloneabletype SqlCommand = class
inherit DbCommand
interface ICloneablePublic NotInheritable Class SqlCommand
Inherits DbCommandPublic NotInheritable Class SqlCommand
Inherits Component
Implements ICloneable, IDbCommand, IDisposablePublic NotInheritable Class SqlCommand
Inherits DbCommand
Implements ICloneable- 繼承
- 繼承
- 繼承
- 實作
範例
以下範例可產生一個SqlConnection、一個SqlCommand、一個。SqlDataReader 範例會讀取資料，並將其寫入主控台。 最後，範例會關閉 ，SqlDataReader然後在退出Using程式碼區塊時關閉 。SqlConnection
private static void ReadOrderData(string connectionString)
{
string queryString =
"SELECT OrderID, CustomerID FROM dbo.Orders;";
using (SqlConnection connection = new SqlConnection(
connectionString))
{
SqlCommand command = new SqlCommand(
queryString, connection);
connection.Open();
using(SqlDataReader reader = command.ExecuteReader())
{
while (reader.Read())
{
Console.WriteLine(String.Format("{0}, {1}",
reader[0], reader[1]));
}
}
}
}
Public Sub ReadOrderData(ByVal connectionString As String)
Dim queryString As String = _
"SELECT OrderID, CustomerID FROM dbo.Orders;"
Using connection As New SqlConnection(connectionString)
Dim command As New SqlCommand(queryString, connection)
connection.Open()
Dim reader As SqlDataReader = command.ExecuteReader()
Try
While reader.Read()
Console.WriteLine(String.Format("{0}, {1}", _
reader(0), reader(1)))
End While
Finally
' Always call Close when done reading.
reader.Close()
End Try
End Using
End Sub
以下範例展示了如何建立與執行不同類型的 SqlCommand 物件。
首先，你必須透過執行以下腳本建立範例資料庫：
USE [master]
GO
CREATE DATABASE [MySchool]
GO
USE [MySchool]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE procedure [dbo].[CourseExtInfo] @CourseId int
as
select c.CourseID,c.Title,c.Credits,d.Name as DepartmentName
from Course as c left outer join Department as d on c.DepartmentID=d.DepartmentID
where c.CourseID=@CourseId
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
create procedure [dbo].[DepartmentInfo] @DepartmentId int,@CourseCount int output
as
select @CourseCount=Count(c.CourseID)
from course as c
where c.DepartmentID=@DepartmentId
select d.DepartmentID,d.Name,d.Budget,d.StartDate,d.Administrator
from Department as d
where d.DepartmentID=@DepartmentId
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
Create PROCEDURE [dbo].[GetDepartmentsOfSpecifiedYear]
@Year int,@BudgetSum money output
AS
BEGIN
SELECT @BudgetSum=SUM([Budget])
FROM [MySchool].[dbo].[Department]
Where YEAR([StartDate])=@Year
SELECT [DepartmentID]
,[Name]
,[Budget]
,[StartDate]
,[Administrator]
FROM [MySchool].[dbo].[Department]
Where YEAR([StartDate])=@Year
END
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Course]([CourseID] [nvarchar](10) NOT NULL,
[Year] [smallint] NOT NULL,
[Title] [nvarchar](100) NOT NULL,
[Credits] [int] NOT NULL,
[DepartmentID] [int] NOT NULL,
CONSTRAINT [PK_Course] PRIMARY KEY CLUSTERED
(
[CourseID] ASC,
[Year] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]) ON [PRIMARY]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Department]([DepartmentID] [int] IDENTITY(1,1) NOT NULL,
[Name] [nvarchar](50) NOT NULL,
[Budget] [money] NOT NULL,
[StartDate] [datetime] NOT NULL,
[Administrator] [int] NULL,
CONSTRAINT [PK_Department] PRIMARY KEY CLUSTERED
(
[DepartmentID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]) ON [PRIMARY]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Person]([PersonID] [int] IDENTITY(1,1) NOT NULL,
[LastName] [nvarchar](50) NOT NULL,
[FirstName] [nvarchar](50) NOT NULL,
[HireDate] [datetime] NULL,
[EnrollmentDate] [datetime] NULL,
CONSTRAINT [PK_School.Student] PRIMARY KEY CLUSTERED
(
[PersonID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]) ON [PRIMARY]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[StudentGrade]([EnrollmentID] [int] IDENTITY(1,1) NOT NULL,
[CourseID] [nvarchar](10) NOT NULL,
[StudentID] [int] NOT NULL,
[Grade] [decimal](3, 2) NOT NULL,
CONSTRAINT [PK_StudentGrade] PRIMARY KEY CLUSTERED
(
[EnrollmentID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]) ON [PRIMARY]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
create view [dbo].[EnglishCourse]
as
select c.CourseID,c.Title,c.Credits,c.DepartmentID
from Course as c join Department as d on c.DepartmentID=d.DepartmentID
where d.Name=N'English'
GO
INSERT [dbo].[Course] ([CourseID], [Year], [Title], [Credits], [DepartmentID]) VALUES (N'C1045', 2012, N'Calculus', 4, 7)
INSERT [dbo].[Course] ([CourseID], [Year], [Title], [Credits], [DepartmentID]) VALUES (N'C1061', 2012, N'Physics', 4, 1)
INSERT [dbo].[Course] ([CourseID], [Year], [Title], [Credits], [DepartmentID]) VALUES (N'C2021', 2012, N'Composition', 3, 2)
INSERT [dbo].[Course] ([CourseID], [Year], [Title], [Credits], [DepartmentID]) VALUES (N'C2042', 2012, N'Literature', 4, 2)
SET IDENTITY_INSERT [dbo].[Department] ON
INSERT [dbo].[Department] ([DepartmentID], [Name], [Budget], [StartDate], [Administrator]) VALUES (1, N'Engineering', 350000.0000, CAST(0x0000999C00000000 AS DateTime), 2)
INSERT [dbo].[Department] ([DepartmentID], [Name], [Budget], [StartDate], [Administrator]) VALUES (2, N'English', 120000.0000, CAST(0x0000999C00000000 AS DateTime), 6)
INSERT [dbo].[Department] ([DepartmentID], [Name], [Budget], [StartDate], [Administrator]) VALUES (4, N'Economics', 200000.0000, CAST(0x0000999C00000000 AS DateTime), 4)
INSERT [dbo].[Department] ([DepartmentID], [Name], [Budget], [StartDate], [Administrator]) VALUES (7, N'Mathematics', 250024.0000, CAST(0x0000999C00000000 AS DateTime), 3)
SET IDENTITY_INSERT [dbo].[Department] OFF
SET IDENTITY_INSERT [dbo].[Person] ON
INSERT [dbo].[Person] ([PersonID], [LastName], [FirstName], [HireDate], [EnrollmentDate]) VALUES (1, N'Hu', N'Nan', NULL, CAST(0x0000A0BF00000000 AS DateTime))
INSERT [dbo].[Person] ([PersonID], [LastName], [FirstName], [HireDate], [EnrollmentDate]) VALUES (2, N'Norman', N'Laura', NULL, CAST(0x0000A0BF00000000 AS DateTime))
INSERT [dbo].[Person] ([PersonID], [LastName], [FirstName], [HireDate], [EnrollmentDate]) VALUES (3, N'Olivotto', N'Nino', NULL, CAST(0x0000A0BF00000000 AS DateTime))
INSERT [dbo].[Person] ([PersonID], [LastName], [FirstName], [HireDate], [EnrollmentDate]) VALUES (4, N'Anand', N'Arturo', NULL, CAST(0x0000A0BF00000000 AS DateTime))
INSERT [dbo].[Person] ([PersonID], [LastName], [FirstName], [HireDate], [EnrollmentDate]) VALUES (5, N'Jai', N'Damien', NULL, CAST(0x0000A0BF00000000 AS DateTime))
INSERT [dbo].[Person] ([PersonID], [LastName], [FirstName], [HireDate], [EnrollmentDate]) VALUES (6, N'Holt', N'Roger', CAST(0x000097F100000000 AS DateTime), NULL)
INSERT [dbo].[Person] ([PersonID], [LastName], [FirstName], [HireDate], [EnrollmentDate]) VALUES (7, N'Martin', N'Randall', CAST(0x00008B1A00000000 AS DateTime), NULL)
SET IDENTITY_INSERT [dbo].[Person] OFF
SET IDENTITY_INSERT [dbo].[StudentGrade] ON
INSERT [dbo].[StudentGrade] ([EnrollmentID], [CourseID], [StudentID], [Grade]) VALUES (1, N'C1045', 1, CAST(3.50 AS Decimal(3, 2)))
INSERT [dbo].[StudentGrade] ([EnrollmentID], [CourseID], [StudentID], [Grade]) VALUES (2, N'C1045', 2, CAST(3.00 AS Decimal(3, 2)))
INSERT [dbo].[StudentGrade] ([EnrollmentID], [CourseID], [StudentID], [Grade]) VALUES (3, N'C1045', 3, CAST(2.50 AS Decimal(3, 2)))
INSERT [dbo].[StudentGrade] ([EnrollmentID], [CourseID], [StudentID], [Grade]) VALUES (4, N'C1045', 4, CAST(4.00 AS Decimal(3, 2)))
INSERT [dbo].[StudentGrade] ([EnrollmentID], [CourseID], [StudentID], [Grade]) VALUES (5, N'C1045', 5, CAST(3.50 AS Decimal(3, 2)))
INSERT [dbo].[StudentGrade] ([EnrollmentID], [CourseID], [StudentID], [Grade]) VALUES (6, N'C1061', 1, CAST(4.00 AS Decimal(3, 2)))
INSERT [dbo].[StudentGrade] ([EnrollmentID], [CourseID], [StudentID], [Grade]) VALUES (7, N'C1061', 3, CAST(3.50 AS Decimal(3, 2)))
INSERT [dbo].[StudentGrade] ([EnrollmentID], [CourseID], [StudentID], [Grade]) VALUES (8, N'C1061', 4, CAST(2.50 AS Decimal(3, 2)))
INSERT [dbo].[StudentGrade] ([EnrollmentID], [CourseID], [StudentID], [Grade]) VALUES (9, N'C1061', 5, CAST(1.50 AS Decimal(3, 2)))
INSERT [dbo].[StudentGrade] ([EnrollmentID], [CourseID], [StudentID], [Grade]) VALUES (10, N'C2021', 1, CAST(2.50 AS Decimal(3, 2)))
INSERT [dbo].[StudentGrade] ([EnrollmentID], [CourseID], [StudentID], [Grade]) VALUES (11, N'C2021', 2, CAST(3.50 AS Decimal(3, 2)))
INSERT [dbo].[StudentGrade] ([EnrollmentID], [CourseID], [StudentID], [Grade]) VALUES (12, N'C2021', 4, CAST(3.00 AS Decimal(3, 2)))
INSERT [dbo].[StudentGrade] ([EnrollmentID], [CourseID], [StudentID], [Grade]) VALUES (13, N'C2021', 5, CAST(3.00 AS Decimal(3, 2)))
INSERT [dbo].[StudentGrade] ([EnrollmentID], [CourseID], [StudentID], [Grade]) VALUES (14, N'C2042', 1, CAST(2.00 AS Decimal(3, 2)))
INSERT [dbo].[StudentGrade] ([EnrollmentID], [CourseID], [StudentID], [Grade]) VALUES (15, N'C2042', 2, CAST(3.50 AS Decimal(3, 2)))
INSERT [dbo].[StudentGrade] ([EnrollmentID], [CourseID], [StudentID], [Grade]) VALUES (16, N'C2042', 3, CAST(4.00 AS Decimal(3, 2)))
INSERT [dbo].[StudentGrade] ([EnrollmentID], [CourseID], [StudentID], [Grade]) VALUES (17, N'C2042', 5, CAST(3.00 AS Decimal(3, 2)))
SET IDENTITY_INSERT [dbo].[StudentGrade] OFF
ALTER TABLE [dbo].[Course] WITH CHECK ADD CONSTRAINT [FK_Course_Department] FOREIGN KEY([DepartmentID])
REFERENCES [dbo].[Department] ([DepartmentID])
GO
ALTER TABLE [dbo].[Course] CHECK CONSTRAINT [FK_Course_Department]
GO
ALTER TABLE [dbo].[StudentGrade] WITH CHECK ADD CONSTRAINT [FK_StudentGrade_Student] FOREIGN KEY([StudentID])
REFERENCES [dbo].[Person] ([PersonID])
GO
ALTER TABLE [dbo].[StudentGrade] CHECK CONSTRAINT [FK_StudentGrade_Student]
GO
接著，編譯並執行以下任務：
using System;
using System.Data;
using System.Data.SqlClient;
using System.Threading.Tasks;
class Program {
static class SqlHelper {
// Set the connection, command, and then execute the command with non query.
public static Int32 ExecuteNonQuery(String connectionString, String commandText,
CommandType commandType, params SqlParameter[] parameters) {
using (SqlConnection conn = new SqlConnection(connectionString)) {
using (SqlCommand cmd = new SqlCommand(commandText, conn)) {
// There're three command types: StoredProcedure, Text, TableDirect. The TableDirect
// type is only for OLE DB.
cmd.CommandType = commandType;
cmd.Parameters.AddRange(parameters);
conn.Open();
return cmd.ExecuteNonQuery();
}
}
}
// Set the connection, command, and then execute the command and only return one value.
public static Object ExecuteScalar(String connectionString, String commandText,
CommandType commandType, params SqlParameter[] parameters) {
using (SqlConnection conn = new SqlConnection(connectionString)) {
using (SqlCommand cmd = new SqlCommand(commandText, conn)) {
cmd.CommandType = commandType;
cmd.Parameters.AddRange(parameters);
conn.Open();
return cmd.ExecuteScalar();
}
}
}
// Set the connection, command, and then execute the command with query and return the reader.
public static SqlDataReader ExecuteReader(String connectionString, String commandText,
CommandType commandType, params SqlParameter[] parameters) {
SqlConnection conn = new SqlConnection(connectionString);
using (SqlCommand cmd = new SqlCommand(commandText, conn)) {
cmd.CommandType = commandType;
cmd.Parameters.AddRange(parameters);
conn.Open();
// When using CommandBehavior.CloseConnection, the connection will be closed when the
// IDataReader is closed.
SqlDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
return reader;
}
}
}
static void Main(string[] args) {
String connectionString = "Data Source=(local);Initial Catalog=MySchool;Integrated Security=True;Asynchronous Processing=true;";
CountCourses(connectionString, 2012);
Console.WriteLine();
Console.WriteLine("Following result is the departments that started from 2007:");
GetDepartments(connectionString, 2007);
Console.WriteLine();
Console.WriteLine("Add the credits when the credits of course is lower than 4.");
AddCredits(connectionString, 4);
Console.WriteLine();
Console.WriteLine("Please press any key to exit...");
Console.ReadKey();
}
static void CountCourses(String connectionString, Int32 year) {
String commandText = "Select Count([CourseID]) FROM [MySchool].[dbo].[Course] Where Year=@Year";
SqlParameter parameterYear = new SqlParameter("@Year", SqlDbType.Int);
parameterYear.Value = year;
Object oValue = SqlHelper.ExecuteScalar(connectionString, commandText, CommandType.Text, parameterYear);
Int32 count;
if (Int32.TryParse(oValue.ToString(), out count))
Console.WriteLine("There {0} {1} course{2} in {3}.", count > 1 ? "are" : "is", count, count > 1 ? "s" : null, year);
}
// Display the Departments that start from the specified year.
static void GetDepartments(String connectionString, Int32 year) {
String commandText = "dbo.GetDepartmentsOfSpecifiedYear";
// Specify the year of StartDate
SqlParameter parameterYear = new SqlParameter("@Year", SqlDbType.Int);
parameterYear.Value = year;
// When the direction of parameter is set as Output, you can get the value after
// executing the command.
SqlParameter parameterBudget = new SqlParameter("@BudgetSum", SqlDbType.Money);
parameterBudget.Direction = ParameterDirection.Output;
using (SqlDataReader reader = SqlHelper.ExecuteReader(connectionString, commandText,
CommandType.StoredProcedure, parameterYear, parameterBudget)) {
Console.WriteLine("{0,-20}{1,-20}{2,-20}{3,-20}", "Name", "Budget", "StartDate",
"Administrator");
while (reader.Read()) {
Console.WriteLine("{0,-20}{1,-20:C}{2,-20:d}{3,-20}", reader["Name"],
reader["Budget"], reader["StartDate"], reader["Administrator"]);
}
}
Console.WriteLine("{0,-20}{1,-20:C}", "Sum:", parameterBudget.Value);
}
// If credits of course is lower than the certain value, the method will add the credits.
static void AddCredits(String connectionString, Int32 creditsLow) {
String commandText = "Update [MySchool].[dbo].[Course] Set Credits=Credits+1 Where Credits<@Credits";
SqlParameter parameterCredits = new SqlParameter("@Credits", creditsLow);
Int32 rows = SqlHelper.ExecuteNonQuery(connectionString, commandText, CommandType.Text, parameterCredits);
Console.WriteLine("{0} row{1} {2} updated.", rows, rows > 1 ? "s" : null, rows > 1 ? "are" : "is");
}
}
備註
當建立 的 SqlCommand 實例時，讀寫屬性會設定為初始值。 如需這些值的清單，請參閱建構函式 SqlCommand 。
SqlCommand 具備以下在 SQL Server 資料庫執行指令的方法：
| 項目 | 說明 |
|---|---|
| BeginExecuteNonQuery | 啟動非同步執行由此 SqlCommand描述的 Transact-SQL 語句或儲存程序，通常執行如 INSERT、DELETE、UPDATE 和 SET 等指令。 每次呼叫 必須 BeginExecuteNonQuery 與 呼叫 EndExecuteNonQuery配對，該呼叫完成操作，通常在獨立執行緒上完成。 |
| BeginExecuteReader | 啟動非同步執行由此 SqlCommand 描述的 Transact-SQL 語句或儲存程序，並從伺服器擷取一個或多個結果集。 每次呼叫 必須 BeginExecuteReader 與 呼叫 EndExecuteReader配對，該呼叫完成操作，通常在獨立執行緒上完成。 |
| BeginExecuteXmlReader | 啟動非同步執行由此 SqlCommand描述的 Transact-SQL 語句或儲存程序。 每次呼叫 必須 BeginExecuteXmlReader 與 的 EndExecuteXmlReader呼叫配對，該呼叫完成操作，通常在獨立執行緒上完成，並回傳一個 XmlReader 物件。 |
| ExecuteReader | 執行回傳列的指令。 為了提升效能，會 ExecuteReader 使用 Transact-SQL sp_executesql 系統儲存程序來呼叫指令。 因此，如果用來 ExecuteReader 執行像 Transact-SQL SET 語句這類指令，可能不會有你想要的效果。 |
| ExecuteNonQuery | 執行 INSERT、DELETE、UPDATE 和 SET Transact-SQL 等指令。 |
| ExecuteScalar | 從資料庫中取得單一值（例如彙總值）。 |
| ExecuteXmlReader | 將 CommandText 傳送到 並 Connection 建立一個 XmlReader 物件。 |
你可以重置屬性 CommandText 並重複使用該 SqlCommand 物件。 不過，你必須先關閉 ， SqlDataReader 才能執行新的或之前的指令。
若 a SqlException 是由執行 的方法 SqlCommand產生，則當嚴重程度等級低於 19 時，該 SqlConnection 保持開啟狀態。 當嚴重程度等級達到 20 或以上時，伺服器通常會關閉 SqlConnection。 不過，使用者可以重新開啟連線並繼續使用。
備註
無名（又稱序數）參數不被 .NET Framework 資料提供者支援。
建構函式
| 名稱 | Description |
|---|---|
| SqlCommand() |
初始化 SqlCommand 類別的新執行個體。 |
| SqlCommand(String, SqlConnection, SqlTransaction, SqlCommandColumnEncryptionSetting) |
初始化一個新的類別實例 SqlCommand ，並指定命令文字、連線、交易及加密設定。 |
| SqlCommand(String, SqlConnection, SqlTransaction) |
初始化一個新的類別實例 SqlCommand ，包含查詢文本 a SqlConnection、 和 SqlTransaction。 |
| SqlCommand(String, SqlConnection) |
初始化一個新的類別實例 SqlCommand ，包含查詢文本與 SqlConnection。 |
| SqlCommand(String) |
初始化一個新的類別實例 SqlCommand ，並使用查詢的文字。 |
屬性
方法
事件
| 名稱 | Description |
|---|---|
| Disposed |
當元件被呼叫方法 Dispose() 時會發生。 (繼承來源 Component) |
| StatementCompleted |
當執行 Transact-SQL 語句完成時發生。 |
明確介面實作
| 名稱 | Description |
|---|---|
| ICloneable.Clone() |
建立一個新的 SqlCommand 物件，該物件是目前實例的複製品。 |
| IDbCommand.Connection |
取得或設定 IDbConnection 此實例 IDbCommand所使用的。 (繼承來源 DbCommand) |
| IDbCommand.CreateParameter() |
建立一個新的物件實例 SqlParameter 。 |
| IDbCommand.CreateParameter() |
建立一個新的物件實例 IDbDataParameter 。 (繼承來源 DbCommand) |
| IDbCommand.ExecuteReader() |
將 CommandText 傳送到 Connection，並構建 SqlDataReader。 |
| IDbCommand.ExecuteReader() |
執行 對 CommandText 並 Connection 構建 IDataReader。 (繼承來源 DbCommand) |
| IDbCommand.ExecuteReader(CommandBehavior) |
將 CommandText 傳送到 Connection，並利用其中一個CommandBehavior值來建立 。SqlDataReader |
| IDbCommand.ExecuteReader(CommandBehavior) |
對 執行 ，CommandTextConnection並利用其中一個CommandBehavior值建立 IDataReader 。 (繼承來源 DbCommand) |
| IDbCommand.Parameters | (繼承來源 DbCommand) |
| IDbCommand.Transaction |
取得或設定該DbCommand物件執行的內部。DbTransaction (繼承來源 DbCommand) |
