SqlCommand.Connection 属性

定义

命名空间:

System.Data.SqlClient

程序集:

System.Data.dll

获取或设置 SqlConnection 此实例 SqlCommand所使用的 。

public:
 property System::Data::SqlClient::SqlConnection ^ Connection { System::Data::SqlClient::SqlConnection ^ get(); void set(System::Data::SqlClient::SqlConnection ^ value); };

public System.Data.SqlClient.SqlConnection Connection { get; set; }

member this.Connection : System.Data.SqlClient.SqlConnection with get, set

Public Property Connection As SqlConnection

属性值

SqlConnection

与数据源的连接。 默认值为 null。

例外

InvalidOperationException

在事务中登记命令时，属性 Connection 已更改。

示例

以下示例创建 SqlCommand 并设置其一些属性。

private static void CreateCommand(string queryString,
    string connectionString)
{
    using (SqlConnection connection = new SqlConnection(
               connectionString))
    {
        SqlCommand command = new SqlCommand();
        command.Connection = connection;
        command.CommandTimeout = 15;
        command.CommandType = CommandType.Text;
        command.CommandText = queryString;

        connection.Open();
        SqlDataReader reader = command.ExecuteReader();
        while (reader.Read())
        {
            Console.WriteLine(String.Format("{0}, {1}",
                reader[0], reader[1]));
        }
    }
}

Public Sub CreateCommand(ByVal queryString As String, _
  ByVal connectionString As String)
    Using connection As New SqlConnection(connectionString)
        Dim command As New SqlCommand()
        command.Connection = connection
        command.CommandTimeout = 15
        command.CommandType = CommandType.Text
        command.CommandText = queryString

        connection.Open()
        Dim reader As SqlDataReader = command.ExecuteReader()
            While reader.Read()
            Console.WriteLine(String.Format("{0}, {1}", _
                reader(0), reader(1)))
        End While
    End Using
End Sub

注解

如果命令在现有事务中登记，并且连接已更改，则尝试执行该命令将引发一个 InvalidOperationException。

Transaction如果该属性不为 null 且事务已提交或回滚，Transaction则设置为 null。

另请参阅

• CommandText
• CommandTimeout
• CommandType
• ADO.NET 概述