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When you inserted the new row into Employees, you hard-coded the values. Although this was perfectly valid SQL, it s something you almost never want (or need) to do. You need to be able to store whatever values are appropriate at any given time. There are two approaches to doing this. Both are reasonable, but one is far more efficient than the other. The less-efficient alternative is to dynamically build a SQL statement, producing a string that contains all the necessary information in the CommandText property. For example, you could do something like this:

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Dim Dim Dim Dim fname As String = "Zachariah" lname As String = "Zinn" vals As String = "('" + fname + "'," + "'" + lname + "')" sqlins As String = _ "insert into employees" _ & "( " _ & " firstname, " _ & " lastname " _ & ") " _ & "values" + vals

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the CREATE TABLE statement used while creating a table object).

s Note Of course, we re using fname and lname simply as rudimentary sources of data. Data most likely comes from some dynamic input source and involves many rows over time, but the technique is nonetheless the same: building a SQL string from a combination of hard-coded SQL keywords and values contained in variables.

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UDEV [1158665885.673200] add@/bus/usb/drivers/usb-storage UEVENT[1158665885.673655] add@/class/scsi_host/host0 UDEV [1158665885.678711] add@/devices/pci0000:00/0000:00:1d.7 6/4-6.1/4-6.1:1.0 UDEV [1158665885.854067] add@/class/usb_device/usbdev4.6 UDEV [1158665885.984639] add@/class/scsi_host/host0 UEVENT[1158665890.682084] add@/devices/pci0000:00/0000:00:1d.7/usb4/46.1/4-6.1:1.0/host0/target0:0:0/0:0:0:0 UEVENT[1158665890.682108] add@/class/scsi_device/0:0:0:0 UDEV [1158665890.858630] add@/devices/pci0000:00/0000:00:1d.7/usb4/4-6/4 6.1:1.0/host0/target0:0:0/0:0:0:0 UEVENT[1158665890.863245] add@/module/sd_mod UEVENT[1158665890.863971] add@/bus/scsi/drivers/sd UDEV [1158665890.864828] add@/module/sd_mod UDEV [1158665890.865941] add@/bus/scsi/drivers/sd UEVENT[1158665890.875674] add@/block/sda UEVENT[1158665890.875949] add@/block/sda/sda1 UEVENT[1158665890.880180] add@/module/sg UDEV [1158665890.880180] add@/class/scsi_device/0:0:0:0 UEVENT[1158665890.880207] add@/class/scsi_generic/sg0 UDEV [1158665890.906347] add@/module/sg UDEV [1158665890.986931] add@/class/scsi_generic/sg0 UDEV [1158665891.084224] add@/block/sda UDEV [1158665891.187120] add@/block/sda/sda1 UEVENT[1158665891.413225] add@/module/fat UDEV [1158665891.413937] add@/module/fat UEVENT[1158665891.427428] add@/module/vfat UDEV [1158665891.436849] add@/module/vfat UEVENT[1158665891.449836] add@/module/nls_cp437 UDEV [1158665891.451155] add@/module/nls_cp437 UEVENT[1158665891.467257] add@/module/nls_iso8859_1 UDEV [1158665891.467795] add@/module/nls_iso8859_1 UEVENT[1158665891.489400] mount@/block/sda/sda1 UDEV [1158665891.491809] mount@/block/sda/sda1

A much better way to handle this is with command parameters. A command parameter is a placeholder in the command text where a value will be substituted. In SQL Server, named parameters are used. They begin with @ followed by the parameter name with no intervening space. So, in the following INSERT statement, @MyName and @MyNumber are both parameters:

SQL Server allows you to rename objects using the predefined stored procedure sp_rename. In the following example, you ll see how to use it to change a stored procedure s name.

INSERT INTO MyTable VALUES (@MyName, @MyNumber)

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Command parameters have several advantages: The mapping between the variables and where they re used in SQL is clearer. Parameters let you use the type definitions that are specific to a particular ADO.NET data provider to ensure that your variables are mapped to the correct SQL data types. Parameters let you use the Prepare method, which can make your code run faster because the SQL in a prepared command is parsed by SQL Server only the first time it s executed. Subsequent executions run the same SQL, changing only parameter values. Parameters are used extensively in other programming techniques, such as stored procedures (see 12) and working with irregular data (see 16).

To rename a stored procedure, follow these steps: 1. Enter the following statement in the query window: Execute sp_rename 'sp_Select_All_Employees', 'sp_Select_Employees_Details' 2. Click Execute, and you will see the following message in the results window, even though sp_rename has been executed successfully: Caution: Changing any part of an object name could break scripts and stored procedures. 3. Now go to Object Explorer, expand the Northwind database node, and then expand the Programmability node. Select the Stored Procedures node, right-click, and select Refresh. 4. Expand the Stored Procedures node and notice that sp_Select_All_Employees has been renamed to sp_Select_Employees_Details. Your screen should resemble Figure 6-8.

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Let s use some command parameters. 1. Add a Console Application project named CommandParameters to the 06 solution. 2. Replace the code in Module1.vb with the code in Listing 6-5. This is a variation of Listing 6-4, with salient changes highlighted.

The sp_rename statement accepts an object s old name and then the object s new name as parameters: Execute sp_rename 'sp_Select_All_Employees', 'sp_Select_Employees_Details'

Imports System Imports System.Data Imports System.Data.SqlClient Module Module1 Sub Main() ' Set up rudimentary data Dim fname As String = "Zachariah" Dim lname As String = "Zinn" ' Set up connection string Dim connString As String = _ "server = .\sqlexpress;" _

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& "integrated security = true;" _ & "database = northwind" ' Set up query Dim sqlqry As String = _ "select " _ & " count(*) " _ & "from & " " _ employees"

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