distinguishing barcode scanners from the keyboard in winforms

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You get the same execution plan as the one shown earlier in Figure 2-1 . At this point, you can turn off the Discard results after execution option in SSMS . Some tasks that are usually implemented as UDFs might seem at least at first glance impossible to rewrite as inline expressions in the query, because they appear to require iterative or procedural logic with multiple statements . With a little creativity, though, you might be able to find a solution that is based on a single expression that can be inlined . For example, try to think how you would implement a task to count the number of occurrences of one string within another . The following code demonstrates how this task can be implemented with an inline expression . The query counts the number of occurrences of @find in the companyname column for each row of the Customers table:

DECLARE @find AS NVARCHAR(40); SET @find = N'n'; SELECT companyname, (LEN(companyname+'*') - LEN(REPLACE(companyname, @find, '')+'*')) / LEN(@find) AS cnt FROM Sales.Customers;

C.2.2

This generates the following output, shown here in abbreviated form:

companyname --------------Customer AHPOP Customer AHXHT Customer AZJED Customer BSVAR Customer CCFIZ Customer CCKOT Customer CQRAA Customer CYZTN cnt ----------0 0 0 0 0 0 0 1

Customer Customer Customer Customer Customer Customer Customer Customer Customer Customer ... DTDMN DVFMB EEALV EFFTC ENQZT EYHKM FAPSM FEVNN FRXZL FVXPQ 1 0 0 0 1 0 0 2 0 0

When you download the code examples for this book, you will notice that every chapter has its own Ant build file in its base directory. Those files are very similar to the one in listing C.1. Let s examine the contents of this build file to see how Ant works.

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The expression uses the REPLACE function to calculate this count . The logic is that you can figure out how many times @find appears in a string by seeing how much shorter the string would get if each instance were removed (that is, replaced with ) . Notice that * is appended to both strings before their lengths are measured to avoid getting an incorrect length when the string has trailing spaces .

You can use scalar UDFs in constraints . The following sections discuss and demonstrate how you can use UDFs in DEFAULT, CHECK, PRIMARY KEY, and UNIQUE constraints .

You can use scalar UDFs in DEFAULT constraints . The only limitation that you should be aware of is that a UDF cannot accept columns from the table as inputs when used in a DEFAULT constraint . For example, the following code creates a table called T1 and a UDF called T1_getkey, which returns the minimum missing key in T1:

IF OBJECT_ID('dbo.T1', 'U') IS NOT NULL DROP TABLE dbo.T1; CREATE TABLE dbo.T1 ( keycol INT NOT NULL CONSTRAINT PK_T1 PRIMARY KEY CHECK (keycol > 0), datacol VARCHAR(10) NOT NULL ); IF OBJECT_ID('dbo.T1_getkey', 'FN') IS NOT NULL DROP FUNCTION dbo.T1_getkey; GO CREATE FUNCTION dbo.T1_getkey() RETURNS INT AS BEGIN RETURN CASE WHEN NOT EXISTS(SELECT * FROM dbo.T1 WHERE keycol = 1) THEN 1 ELSE (SELECT MIN(keycol + 1) FROM dbo.T1 AS A WHERE NOT EXISTS

< xml version="1.0" encoding="UTF-8" > <project name="Sample" default="run" basedir="."> <property <property <property <property <property

This section covers calculations that return a next or previous weekday with respect to a given date and time value . I use the word respective to describe this sort of calculation . Suppose that you need to calculate the latest Monday before or on a given reference date and time . The calculation needs to be inclusive of the reference date; that is, if the reference

The steps to follow to give a presentation in mirrored mode depend on the hardware and software settings defined by the manufacturer of your mobile PC. Most mobile PC screens can be toggled to mirrored mode either by clicking an icon in the notification area or by pressing a function key combination (often either FUNCTION+F5 or FUNCTION+F8). The function key to use might be labeled with a monitor icon, or with the phrase CRT/LCD. If you can't locate the screen toggle command, you will need to refer to the PC manufacturer's documentation.

date is a Monday, return the reference date; otherwise, return the latest Monday before the reference date . You can use the following expression to achieve this:

SELECT DATEADD( day, DATEDIFF( day, '19000101', -- Base Monday date SYSDATETIME()) /7*7, '19000101'); -- Base Monday date

name="project.name" value="Ant Tutorial"/> name="ant.home" value="C:/ant"/> name="build.dir" value="${basedir}/build"/> name="src.dir" value="${basedir}/src"/> name="lib.dir" value="${base.dir}/lib"/>

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