小编Jon*_*han的帖子

我创建时态表以设置级别：

CREATE TABLE [#DesignLvl]
(
    [DesignKey] INT,
    [DesignLevel] INT
);

WITH RCTE AS 
(
    SELECT
        *,
        1 AS [Lvl]
    FROM 
        [Design]
    WHERE 
        [ParentDesignKey] IS NULL

    UNION ALL

    SELECT
        [D].*,
        [Lvl] + 1 AS [Lvl]
    FROM 
        [dbo].[Design] AS [D]
    INNER JOIN 
        [RCTE] AS [rc] ON [rc].[DesignKey] = [D].[ParentDesignKey]
)
INSERT INTO [#DesignLvl]
    SELECT
        [DesignKey], [Lvl]
    FROM 
        [RCTE]

创建后，在非常大的查询中将LEFT JOIN用作：

SELECT... 
FROM.. 
LEFT JOIN [#DesignLvl] AS [dl] ON d.DesignKey = dl.DesignKey
WHERE ...

该查询有效，但是性能下降并且查询现在太慢。有什么方法可以优化此表？

CTE执行计划

我尝试将CLUSTERED索引添加为：

CREATE TABLE [#DesignLvl]
(
    [DesignKey] INT, …

I'm working with windows forms and I want to copy entire tree view with their childrens in order set in clipboard in KeyDown event

First I try to set parent nodes as:

  private void tvProjectList_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyData == (Keys.C))
            {
                var treeViewParents = "";
                foreach (TreeNode tn in tvProjectList.Nodes)
                {
                    treeViewParents += tn.Text + Environment.NewLine;
                }
                Clipboard.SetText(treeViewParents);

            }
        }

But it just get one node instead all nodes. How am I supposed to do it? Regards …

我正在使用c#,我有工作代码,我在每行重复相同的代码,这是因为我正在创建列表,转换,提取数据等.

所以我有多个foreach子句,多个lists,多个转换list为datatables.我的问题是,为了获得干净的代码,我该怎么做才能重新分解这个？

码:

private void BtnLoadReport_Click(object sender, EventArgs e)
{
   var db = new SQLDataMgr();

   List<string> DesignStatusList = new List<string>();
   List<string> ShopStatusList = new List<string>();
   List<string> CustomerTypeList = new List<string>();
   List<string> CustomerList = new List<string>();
   List<string> ResellerList = new List<string>();
   List<string> StateList = new List<string>();
   List<string> ProjectManagerList = new List<string>();
   List<string> SalesRepresentativeList = new List<string>();

   var checkedDesignStatus = cboDesignStatus.CheckBoxItems.Where(x => x.Checked);
   var checkedShopStatus = cboShopStatus.CheckBoxItems.Where(x => x.Checked);
   var checkedCustomerType = cboShopStatus.CheckBoxItems.Where(x => …

我正在使用 asp.net core 2.1，我有一个简单的视图，其形式如下：

@model Security.WebUi.Pages.AssignClaimToUserModel

<form method="post">
    <div>
        <label>User:  </label>
        <select asp-for="UserId" asp-items="@Model.UserList">
            <option>Please select one</option>
        </select>
    </div>
    <div>
        <label>Role?</label>
        <input type="checkbox" name="IsRole" id="isRole" />
    </div>
    <div>
        <label>Claim Type</label>
        <input type="text" name="ClaimType" id="claimType" />
    </div>
    <div>
        <label>Claim Value</label>
        <input type="text" name="ClaimValue" />
    </div>
    <button type="submit">Submit</button>
</form>

IsRole正如你所看到的，我有一个带有属性的复选框

所以在我的模型中我有一个布尔值：

 public class ClaimToUserdModel
    {
        public string ClaimType { get; set; }
        public string ClaimValue { get; set; }
        public Guid UserId { get; set; }
        public bool IsRole { get; …

我有一个存储过程来获取这些参数:

@TaskId        UNIQUEIDENTIFIER,
@ColumnName    VARCHAR(255) = NULL,
@CheckBoxValue VARCHAR(255) = NULL

然后我有这样的UPDATE声明:

UPDATE [RedMarkItems]
SET @ColumnName = @CheckBoxValue
WHERE [TaskId] = @TaskId

如果我运行我的存储过程,如:

exec usp_RedMarkItem_Insert 
         @TaskId = '82ab0c4b-9342-46fa-acbe-c00b87571bf9', 
         @ColumnName = Item7, 
         @CheckBoxValue = 1, 
         @CurrentUser = '6074caea-7a8e-4699-9451-16c2eaf394ef'

它只是说不影响表

命令已成功完成

但是值仍然相同,但是如果我在UPDATE语句中替换值就像

UPDATE [RedMarkItems]
SET Item7 = 1
WHERE [TaskId] = '82ab0c4b-9342-46fa-acbe-c00b87571bf9'

有用!如果我使用参数,为什么它不起作用？问候

我将列添加到表中:

RedMarkItemsId (IDENTITY(1,1) NOT NULL PRIMARY KEY)
TaskId (UNIQUEIDENTIFIER)
CreationDate (DATETIME)
CreatedBy (UNIQUEIDENTIFIER)

我想创建如下列:

  ALTER TABLE RedMarkItems ADD Item1 BIT DEFAULT(0)

但是当我尝试插入一些值时:

INSERT INTO RedMarkItems 
VALUES (
    '9B093907-2072-4F59-A55C-0003CE89EF9E', 
    GETDATE(), 
    '6074CAEA-7A8E-4699-9451-16C2EAF394EF')

它抛出错误:

列名或提供的值数与表定义不匹配.

如果我设置DEFAULT(0)为新列,为什么我会收到此错误？

表创建脚本:

CREATE TABLE RedMarkItems 
(
    RedMarkItemsId INT IDENTITY(1,1) NOT NULL PRIMARY KEY,
    TaskId UNIQUEIDENTIFIER,
    CreationDate DATETIME,
    CreatedBy UNIQUEIDENTIFIER
)

我有这样一张桌子:

+-------------+--------------------------------------+--------------------------------------+---------------+
| BackCheckId |                TaskId                |               EmpGuid                | CompletedDate |
+-------------+--------------------------------------+--------------------------------------+---------------+
|           1 | B92F7079-2011-44D6-B3C4-BD2F7481C97F | 6074CAEA-7A8E-4699-9451-16C2EAF394EF | NULL          |
|           2 | 82AB0C4B-9342-46FA-ACBE-C00B87571BF9 | 6074CAEA-7A8E-4699-9451-16C2EAF394EF | NULL          |
+-------------+--------------------------------------+--------------------------------------+---------------+

查询创建:

CREATE TABLE Backchecks(
  BackCheckId int,
  TaskId UNIQUEIDENTIFIER,
  EmpGuid UNIQUEIDENTIFIER,
  CompletedDate DATETIME
);

INSERT INTO Backchecks VALUES
(1, 'B92F7079-2011-44D6-B3C4-BD2F7481C97F', '6074CAEA-7A8E-4699-9451-16C2EAF394EF',NULL),
(2, '82AB0C4B-9342-46FA-ACBE-C00B87571BF9','6074CAEA-7A8E-4699-9451-16C2EAF394EF',NULL)

我想要做的是根据这个过滤这些数据currentEmpGuid我声明变量来测试它:

 DECLARE @CurrentEmpGuid UNIQUEIDENTIFIER = 'CC713AC9-ED79-47E3-BA37-47F2D5009BFC'   
DECLARE @FilterEmpKey INT = NULL
    SELECT * FROM Backchecks AS BC 
    WHERE [BC].[CompletedDate] IS NULL
                           AND (@FilterEmpKey IS NULL …

我有多个复选框,我是从代码中创建的,所以我知道我可以使用以下复选框:

foreach (var checkBox in this.Controls.OfType<CheckBox>())
            {

            }

但是,我想知道或者我想要的结果是知道我的表单的所有复选框是否被检查,如果所有复选框被选中则返回true,如果缺少复选框则返回false ...如何实现？问候

bool allChecked = ...