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The value automatically produced with the IDENTITY property is normally unique, but that isn t guaranteed by the IDENTITY property itself, nor are the IDENTITY values guaranteed to be consecutive. (I will expand on the issues of nonunique and nonconsecutive IDENTITY values later in this section.) For ef ciency, a value is considered used as soon as it is presented to a client doing an INSERT operation. If that client doesn t ultimately commit the INSERT, the value never appears, so a break occurs in the consecutive numbers. An unacceptable level of serialization would exist if the next number couldn t be parceled out until the previous one was actually committed or rolled back. (And even then, as soon as a row was deleted, the values would no longer be consecutive. Gaps are inevitable.)

1. Select the notifyWeather control in the component tray, and in the Properties window, change the ContextMenuStrip property to cmsNotify. You are currently acting as the user. For you to be able to click the application when it s in the notification area, your notifyWeather control needs an icon. The icon will later become dynamically generated by your application, and the icon will become the current temperature. Therefore, you now need to associate a temporary icon with the application; otherwise, you will not be able to select it in the notification area.

to use. Instead, you should implement a next_number-type table in which you can make the operation of bumping the number contained within it part of the larger transaction (and incur the serialization of queuing for this value).

.

To temporarily disable the automatic generation of values in an identity column, you use the SET IDENTITY_INSERT tablename ON option. In addition to lling in gaps in the identity sequence, this option is useful for tasks such as bulk-loading data in which the previous values already exist. For example, perhaps you re loading a new database with customer data from your previous system. You might want to preserve the previous customer numbers but have new ones automatically assigned using IDENTITY. The SET option was created exactly for cases like this. Because the SET option allows you to determine your own values for an IDENTITY column, the IDENTITY property alone doesn t enforce uniqueness of a value within the table. Although IDENTITY generates a unique number if IDENTITY_INSERT has never been enabled, the uniqueness is not guaranteed once you have used the SET option. To enforce uniqueness (which you ll almost always want to do when using IDENTITY), you should also declare a UNIQUE or PRIMARY KEY constraint on the column. If you insert your own values for an identity column (using SET IDENTITY_INSERT), when automatic generation resumes, the next value is the next incremented value (or decremented value) of the highest value that exists in the table, whether it was generated previously or explicitly inserted.

5

Tip If you use the bcp utility for bulk-loading data, be aware of the -E (uppercase) parameter if your data already has assigned values that you want to keep for a column that has the IDENTITY property. You can also use the T-SQL BULK INSERT command with the KEEPIDENTITY option. For more information, see the SQL Server documentation for bcp and BULK INSERT. The keyword IDENTITYCOL automatically refers to the speci c column in a table that has the IDENTITY property, whatever its name. If that column is cust_id, you can refer to the column as IDENTITYCOL without knowing or using the column name, or you can refer to it explicitly as cust_id. For example, the following two statements work identically and return the same data:

2. In the Properties window for notifyWeather, set the Icon property to otheroptions.ico. This file is located in a folder named Images in the 9 folder where you installed the companion content. 3. Press F5 to execute the application. You should see this icon in your notification area: If you right-click this icon, you should see the context menu shown in Figure 9-3.

SELECT IDENTITYCOL FROM customer; SELECT cust_id FROM customer;

The column name returned to the caller is cust_id, not IDENTITYCOL, in both cases. When inserting rows, you must omit an identity column from the column list and VALUES section. (The only exception is when the IDENTITY_INSERT option is on.) If you do supply a column list, you must omit the column for which the value will be supplied automatically. Here are two valid INSERT statements for the customer table shown previously: