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SQL Server 2000 Stored Procedure Programming
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If @intErrorCode = 0 begin Set @ExpectedShippingQuarter = dateName (qq, @ExpectedShipDate) + 'Q' + dateName (yyyy, @ExpectedShipDate) select @intErrorCode = @@Error end -- insert row If @intErrorCode = 0 begin insert into ExpectedShipDate ( ExpectedShipDateId, ExpectedShipDate, ExpectedShippingMonth, ExpectedShippingDay, ExpectedShippingYear, ExpectedShippingQuarter) values (@ExpectedShipDateId, @ExpectedShippingYear, Select @intErrorCode = @@Error End If @intErrorCode = 0 Begin Select @day_number = @day_number - 1, @ExpectedShipDatecurrent = @ExpectedShipDatecurrent + 1 Select @intErrorCode = @@Error End End Return Go @intErrorCode @ExpectedShipDatecurrent, @ExpectedShippingQuarter)
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@ExpectedShippingMonth, @ExpectedShippingDay,
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Exercise 5.3
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Create a table to store contact information. The last column should contain a binary checksum value so that you can later see if the record has changed.
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The following code snippet shows a new contact table with the BC field reserved for a binary checksum:
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CREATE TABLE [Contact_with_BC] ( [ContactId] [int] IDENTITY (1, 1) NOT NULL , [FirstName] [varchar] (30) NOT NULL , [LastName] [varchar] (30) NOT NULL , [Phone] [typPhone] NULL , [Fax] [typPhone] NULL , [Email] [typEmail] NULL , [OrgUnitId] [smallint] NOT NULL , [UserName] [varchar] (50) NULL , BC int null ) ON [PRIMARY] GO
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The value in the BC column can be managed from a trigger:
CREATE TRIGGER trContact_with_BC_IU ON [dbo].[Contact_with_BC] FOR INSERT, UPDATE AS update Contact_with_BC set BC = BINARY_CHECKSUM(FirstName, LastName, Phone, Fax, Email, OrgUnitId, UserName) where ContactId in (select ContactId from inserted) GO
You can test the table, function, and trigger in the following manner:
insert Contact_with_BC (FirstName, LastName, Phone, OrgUnitId) values('Tom', 'Jones', '123-4567', 1) select * from Contact_with_BC
SQL Server 2000 Stored Procedure Programming
update Contact_with_BC set Phone = '313-1313' where ContactId = 1 select * from Contact_with_BC
CHAPTER 6. COMPOSITE TRANSACT-SQL CONSTRUCTS BATCHES, SCRIPTS, AND TRANSACTIONS
Exercise 6.1
Create a database script for the Asset database.
Exercise 6.1 Solution
1. Open Enterprise Manager. 2. Right-click the Asset database in the Console Tree pane. 3. Select All Tasks | Generate SQL Scripts. 4. Optionally make changes to default parameters, then click OK to accept. 5. When the application prompts you, specify a name for the script file to store the result.
Exercise 6.2
Create a database script for a single stored procedure in the Asset database. Add a line of comment into the script and execute it.
Exercise 6.2 Solution
1. Open Enterprise Manager.
Appendix B:
Solutions to the Exercises
2. Right-click the stored procedure in the Asset database for which you want to generate code. 3. Select All Tasks | Generate SQL Scripts. 4. The application displays a dialog box with a single stored procedure selected in the Objects To Be Scripted list (see Figure B-4). Click OK to accept the default parameters. 5. When the application prompts you, specify a name for the script file to be used to store the result. 6. Start Query Analyzer. 7. Open the script file (see the result of File | Open in Figure B-5). 8. Add a line of comment (place -- at the beginning of the line). 9. Execute the script (Query | Execute).
Figure B-4.
Generating a script for a single stored procedure
SQL Server 2000 Stored Procedure Programming
Figure B-5.
A script for prListLeasedAssets
Exercise 6.3
What is the problem with the following script
select * from Eq /* Go delete Eq where EqId > 100 Go */ select * from EqType
Appendix B:
Solutions to the Exercises
How can you fix it
Exercise 6.3 Solution
The problem is that this script contains a comment that spans multiple batches. If you execute this script from Query Analyzer, it is divided into three batches. The first and the last batch do not execute because they contain incomplete comments. The second batch executes (contrary to expectations) and will purge a good portion of the Eq table. You can fix the problem by changing the location of the comment markers:
select * from Eq Go /* delete Eq where EqId > 100 */ Go select * from EqType
You can also comment-out the Go command by placing two dashes at the beginning of the line with the Go statement:
select * from Eq /* --Go delete Eq where EqId > 100 --Go */ select * from EqType
SQL Server 2000 Stored Procedure Programming
Exercise 6.4
How do the Rollback Transaction and Commit Transaction statements affect @@trancount
Exercise 6.4 Solution
Commit Transaction decreases @@trancount by one. If @@trancount then equals 1, it also commits changes to the database. Rollback Transaction discards all changes and sets @@trancount to 0.
Exercise 6.5
Create a table with bank account information and then a stored procedure for transferring funds from one account to another. The stored procedure should contain transaction processing.
Exercise 6.5 Solution
Use the following code:
CREATE TABLE [dbo].[Account] ( [AccountId] [char] (10) NOT NULL , [Balance] [money] NOT NULL , [AccountTypeId] [int] NOT NULL ) GO ALTER TABLE [dbo].[Account] WITH NOCHECK ADD CONSTRAINT [PK_Account] PRIMARY KEY ( [AccountId] ) GO NONCLUSTERED
CREATE PROCEDURE prTransferFunds @From char(20),
Appendix B:
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