Tag: code-snippet

SQL Last Day of Month

How do I get the last day of the month in a SQL query? Someone recently asked me this question and as with so many questions in development the answer is: it depends.

Prior to SQL Server 2012, this is what typical T-SQL to compute last day of the month would look like:

DECLARE @date DATE = '2017-12-15';
DECLARE @firstOfMonth DATE = DATEFROMPARTS(YEAR(@date), MONTH(@date), 1);
SELECT DATEADD(DAY,-1, DATEADD(MONTH, 1, @firstOfMonth));

With SQL Server 2012 or later, the EOMONTH() gives you a much more concise option which looks like:

DECLARE @date DATE = '2017-12-15';
SELECT EOMONTH(@date)
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Using a Recursive CTE to Build Paths

Here’s the scenario. You have a hierarchical data set like categories, folders, etc. and you need to output the entire path for each.

Let’s say we take the category example and we have a table that looks like:

CREATE TABLE [dbo].[Category](
	[Id] [int] IDENTITY(1,1) NOT NULL,
	[Name] [nvarchar](max) NOT NULL,
	[ParentCategoryId] [int] NULL,
    -- normal PK script removed to keep this short
) 

To get the full path for each category, the SQL would look like:

WITH CTE_CategoriesWithPaths AS
( 
    SELECT 
        c.Id, 
        c.Name, 
        c.ParentCategoryId, 
        c.Name AS [Path] 
    FROM Category c 
    WHERE c.ParentCategoryId IS NULL 
    UNION ALL
    SELECT 
        c.Id, 
        c.Name, 
        c.ParentCategoryId,
        cte.[Path] + '/' + c.Name AS [Path] 
    FROM 
        Category c 
        INNER JOIN CTE_CategoriesWithPaths cte 
            ON c.ParentCategoryId = cte.Id
    WHERE c.ParentCategoryId IS NOT NULL 
)
SELECT * 
from CTE_CategoriesWithPaths

ASP.NET Forms Disabled CSS for BootStrap

The following CSS is to handle Enabled set to true in any WebControl.

/* -- Bootstrap Additions - ASP.NET Disabled ----------------- */

input[type="radio"].aspNetDisabled,
input[type="checkbox"].aspNetDisabled,
.radio-inline.aspNetDisabled,
.checkbox-inline.aspNetDisabled,
.radio.aspNetDisabled label,
.checkbox.aspNetDisabled label
{
    cursor: not-allowed;
}

.btn.aspNetDisabled
{
    pointer-events: none;
    cursor: not-allowed;
    filter: alpha(opacity=65);
    -webkit-box-shadow: none;
    box-shadow: none;
    opacity: .65;
}

.btn-default.aspNetDisabled,
.btn-default.aspNetDisabled:hover,
.btn-default.aspNetDisabled:focus,
.btn-default.aspNetDisabled:active,
.btn-default.aspNetDisabled.active
{
    background-color: #fff;
    border-color: #ccc;
}

.btn-primary.aspNetDisabled,
.btn-primary.aspNetDisabled:hover,
.btn-primary.aspNetDisabled:focus,
.btn-primary.aspNetDisabled:active,
.btn-primary.aspNetDisabled.active
{
    background-color: #428bca;
    border-color: #357ebd;
}

.btn-success.aspNetDisabled,
.btn-success.aspNetDisabled:hover,
.btn-success.aspNetDisabled:focus,
.btn-success.aspNetDisabled:active,
.btn-success.aspNetDisabled.active
{
    background-color: #5cb85c;
    border-color: #4cae4c;
}

.btn-info.aspNetDisabled,
.btn-info.aspNetDisabled:hover,
.btn-info.aspNetDisabled:focus,
.btn-info.aspNetDisabled:active,
.btn-info.aspNetDisabled.active
{
    background-color: #5bc0de;
    border-color: #46b8da;
}

.btn-warning.aspNetDisabled,
.btn-warning.aspNetDisabled:hover,
.btn-warning.aspNetDisabled:focus,
.btn-warning.aspNetDisabled:active,
.btn-warning.aspNetDisabled.active
{
    background-color: #f0ad4e;
    border-color: #eea236;
}

.btn-danger.aspNetDisabled,
.btn-danger.aspNetDisabled:hover,
.btn-danger.aspNetDisabled:focus,
.btn-danger.aspNetDisabled:active,
.btn-danger.aspNetDisabled.active
{
    background-color: #d9534f;
    border-color: #d43f3a;
}

.dropdown-menu > .aspNetDisabled > a,
.dropdown-menu > .aspNetDisabled > a:hover,
.dropdown-menu > .aspNetDisabled > a:focus,
.dropdown-menu > li > a.aspNetDisabled,
.dropdown-menu > li > a.aspNetDisabled:hover,
.dropdown-menu > li > a.aspNetDisabled:focus
{
    color: #777;
}

.dropdown-menu > .aspNetDisabled > a:hover,
.dropdown-menu > .aspNetDisabled > a:focus,
.dropdown-menu > li > a.aspNetDisabled:hover,
.dropdown-menu > li > a.aspNetDisabled:focus
{
    text-decoration: none;
    cursor: not-allowed;
    background-color: transparent;
    background-image: none;
    filter: progid:DXImageTransform.Microsoft.gradient(enabled = false);
}

 

ASP.NET Membership Log Out

My boss likes to say “never use the words ‘simple’ or ‘easy’ in our line of work” and today was one of those days that demonstrates exactly why he loves this saying.

We were asked to setup an auto logout feature that redirects to the login screen. I’ve done so much Windows Authentication work that I’ve never actually had to build this functionality. I went straight to my favorite search engine and I found the following code.

FormsAuthentication.SignOut();
Session.Abandon();
FormsAuthentication.RedirectToLoginPage();

Everyone was commenting about how this worked great and lo and behold it wasn’t working. More research and I found an article that explained that the above neglected to clear cookies sometimes and that to 100% ensure a sign out you should clear the forms authentication and session cookies.

The following code is what I ended up using in our application. It only expires the cookies that are forms authentication and session related.

FormsAuthentication.SignOut();
Session.Abandon();

var cookies = new List<string>
{
    "ASP.NET_SessionId", 
    FormsAuthentication.FormsCookieName, 
    ".ASPXROLES"
};

foreach (var cookie in cookies)
{
    if (Request.Cookies.AllKeys.Contains(cookie))
    {
        Request.Cookies[cookie].Expires = DateTime.Now.AddYears(-1);
    }
}

FormsAuthentication.RedirectToLoginPage();

SQL If Exists Then Drop

This is one topic that I continually find myself refering to my notes and bookmarks on and I’ve finally decided to add this piece of very good reference information to my own blog.

Tables

Option 1:

IF OBJECT_ID('enterTableNameHere', 'U') IS NOT NULL
BEGIN
    DROP TABLE [dbo].[enterTableNameHere]
END
GO

Option 2:

IF EXISTS
(
    SELECT * FROM dbo.sysobjects
    WHERE id = object_id(N'[dbo].[enterTableNameHere]')
         AND OBJECTPROPERTY(id, N'IsUserTable') = 1
)
BEGIN
    DROP TABLE [dbo].[enterTableNameHere]
END
GO

Views

IF EXISTS
(
    SELECT * FROM INFORMATION_SCHEMA.VIEWS
    WHERE TABLE_SCHEMA = 'enterSchemaNameHere' AND TABLE_NAME = 'enterViewNameHere'
)
BEGIN
    DROP VIEW [dbo].[enterViewNameHere]
END
GO

Stored Procedures

IF EXISTS
(
    SELECT * FROM dbo.sysobjects
    WHERE id = object_id(N'[dbo].[enterStoredProcedureNameHere]')
        AND OBJECTPROPERTY(id, N'IsProcedure') = 1
)
BEGIN
    DROP PROCEDURE [dbo].[enterStoredProcedureNameHere]
END
GO

User-Defined Functions

IF EXISTS
(
    SELECT * FROM INFORMATION_SCHEMA.ROUTINES
    WHERE	ROUTINE_NAME = 'enterFunctionNameHere'
    AND ROUTINE_SCHEMA = 'dbo'
    AND ROUTINE_TYPE = 'FUNCTION'
)
BEGIN
    DROP FUNCTION [dbo].[enterFunctionNameHere]
END
GO