Question

在C＃代码中插入数据后，我需要从存储过程中获取scope_identity()值。

这里我使用的是3层架构。请任何人帮助我

protected void Submit_Click(object sender, EventArgs e)
{
    this.CreateUserGroups(strGroupName, strDescription, strGroupType);
}

protected void CreateUserGroups(string strGroupName, string strDescription, string strGroupType)
{
    string strReturn = string.Empty;
    strReturn = objUser.SaveCreateGroups(strGroupName, strDescription, strGroupType);
}

public string SaveCreateGroups(string strGroupName, string strDescription, string strGroupType)
{
    try
    {
        DataManager.ParamBuilder param = new DataManager.ParamBuilder();
        if (strGroupName != string.Empty)
            param.AddParam(System.Data.SqlDbType.VarChar, "@c_groupname", strGroupName);
        else
            param.AddParam(System.Data.SqlDbType.Int, "@c_groupname", DBNull.Value);

        if (strDescription != string.Empty)
            param.AddParam(System.Data.SqlDbType.VarChar, "@c_description", strDescription);
        else
            param.AddParam(System.Data.SqlDbType.Int, "@c_description", DBNull.Value);

        if (strGroupType != string.Empty)
            param.AddParam(System.Data.SqlDbType.Int, "@n_grouptype", strGroupType);
        else
            param.AddParam(System.Data.SqlDbType.VarChar, "@n_grouptype", DBNull.Value);


        String strIsUserExitsInGroup = DataManager.ExecuteScalar("sp_create_user_groups", param.Parameters, true).ToString();

        return strIsUserExitsInGroup;
    }
    catch (Exception e)
    {
        throw new Exception(e.ToString());
    }
}

public static object ExecuteScalar(string procedureNameOrSql, List<SqlParameter> parameters, bool isStoredProcedure)
{
    object scalarValue;
    using (SqlConnection cn = createConnection())
    {
        SqlCommand cmd = new SqlCommand(procedureNameOrSql, cn);
        if (isStoredProcedure)
            cmd.CommandType = CommandType.StoredProcedure;
        if (parameters != null)
            cmd.Parameters.AddRange(parameters.ToArray());
        scalarValue = cmd.ExecuteScalar();
    }
    return scalarValue;
}

我的存储过程：

CREATE Procedure [dbo].[sp_create_user_groups]
  @n_user_group_id int OUTPUT,
  @c_groupname varchar(200),
  @c_description varchar(200),
  @n_grouptype int
As
   Declare @IsGroupNameExists int,        
           @b_active bit

   select @IsGroupNameExists = 0
   set @b_active = 1

BEGIN
IF exists(select top 1 * from gdt_user_groups where c_group_name = @c_groupname)
BEGIN
 select @IsGroupNameExists = 1
END
ELSE
 BEGIN
    SET NOCOUNT ON;
    insert into gdt_user_groups(c_group_name,c_description,n_group_id,b_active,d_modified_dttm,
    d_created_dttm)values(@c_groupname,@c_description,@n_grouptype,@b_active,GETDATE(),GETDATE())
    select @n_user_group_id = SCOPE_IDENTITY();
    select @IsGroupNameExists = 0
 END 

 select @IsGroupNameExists
 END

这里我可以在C＃代码中获取scope_identity值。有人帮忙吗？

Answer 1

您需要通过输出参数获取值，因此您必须遵循以下链接：
Get output parameter value in ADO.NET
How to use OUTPUT parameter in Stored Procedure

你只需要创建一个SqlParameter，将Direction设置为Output，并将其添加到SqlCommand的Parameters集合中。然后执行存储过程并获取参数的值。

在方法

中添加额外参数后，添加参数如下所示

param.AddParam(SqlDbType.Int, "@c_Id", IdValue, ParameterDirection.Output);

然后

访问输出参数的值，如下所示：

object value = cmd.Parameters["@c_Id"].Value;

来源： Getting the identity of the most recently added record 代码段：

string query = "AddCategory";
int ID;
string connect = @"Server=.\SQLExpress;Database=Northwind;Trusted_Connection=Yes;";
using (SqlConnection conn = new SqlConnection(connect))
{
  using (SqlCommand cmd = new SqlCommand(query, conn))
  {
    cmd.CommandType = CommandType.StoredProcedure;
    cmd.Parameters.AddWithValue("@Category", Category.Text);
    cmd.Parameters.Add("@CategoryID", SqlDbType.Int, 0, "CategoryID");
    cmd.Parameters["@CategoryID"].Direction = ParameterDirection.Output;
    conn.Open();
    cmd.ExecuteNonQuery();
    ID = (int)cmd.Parameters["@CategoryID"].Value;
  }
}

...程序

CREATE PROCEDURE AddCategory
  -- Add the parameters for the stored procedure here
  @Category NVARCHAR(15),
  @CategoryID INT OUTPUT
AS
BEGIN
  SET NOCOUNT ON;

  -- Insert statements for procedure here
  INSERT INTO Categories (CategoryName) VALUES (@Category)
  SET @CategoryID = SCOPE_IDENTITY()
END

希望上面的参考资料可以帮助您更好地理解所有这些。

Answer 2

阅读这篇文章：http://www.mikesdotnetting.com/Article/54/Getting-the-identity-of-the-most-recently-added-record

让你的录取率更高。

从3层体系结构中的存储过程中获取C＃代码中的scope_identity值

2 个答案: