c# datamatrix open source WORKING WITH THE DATA in Visual C#.NET

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CHAPTER 8 WORKING WITH THE DATA
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Figure 8-39. Defining only the ShareDetails schema
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Figure 8-40. Detailing the ShareDetails schema objects
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CHAPTER 8 WORKING WITH THE DATA
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6. Change the Securables list to the ShareDetails.Shares table. Then in the Explicit Permissions area grant Select permissions by checking the check box as shown in Figure 8-41. I will explain this section in more detail shortly. Once done, click OK, which will then apply these changes to AJMason.
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Figure 8-41. Allowing the user to only select from ShareDetails.Shares 7. Now switch to AJMason on your computer, and connect to SQL Server 2005. Create a new Query Editor window. If you do a SELECT * FROM ShareDetails.Shares, then you will get an empty list. This is because you have SELECT permissions. However, if you try to INSERT some data, as shown in Figure 8-42, then you will see an error.
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Figure 8-42. AJMason cannot insert data.
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CHAPTER 8 WORKING WITH THE DATA
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Securables
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There are three different options in the Securables dialog box for explicit permissions. These are GRANT, WITH GRANT, and DENY. Although we are looking at tables here, the same options are possible with other objects that we come across within SQL Server. GRANT: This will grant the user or role access on that action on the defined table. WITH GRANT: This will also grant the user or role access on that action on the defined table. However, anyone with this option can also pass on the permission to other users or roles. DENY: This explicitly denies any user or role the action against the table. By setting up different roles and placing users in those roles, you should now know which users can access the data, and how to set up groups of users to protect your data. Of course, it is normal practice to set up several roles within your database for each area of the business. There would be a role for supervisors, and perhaps another for line managers, and another for directors, and so on. It all depends on your database and the solution you are providing as to how many different roles are required. But from this it is simpler to control access to the data.
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Updating Data
Now that data has been inserted into our database, and you have seen how to retrieve this information, it is time to look at how to modify the data, referred to as updating the data, and the different methods of deletion. Ensuring that you update the right data at the right time is crucial to maintaining data integrity. You will find that when updating data, and also when removing or inserting data, it is best to group this work as a single, logical unit, called a transaction, thereby ensuring that if an error does occur, it is still possible to return the data back to its original state. This section describes how a transaction works and how to incorporate transactions within your code. When looking at transactions, we will only be taking an overview of them. We will look at the basics of a transaction and how it can affect the data. Deleting data can take one of two forms. The first is where a deletion of the data is logged in the transaction log. This means that if there is a failure of some sort, the deletion can be backed out. The second is where the deletion of the data is minimally logged. Knowing when to use each of these actions can improve performance of deletions. This discussion aims to ensure that you Know the syntax of the UPDATE command. Are competent at updating data within a SQL Server table. Are aware of transactions and how to use them effectively within SQL Server. Understand the dangers when transactions are nested. Know the syntax for the DELETE command. Know how to use this command in T-SQL. Are aware of the pitfalls of the TRUNCATE command. First of all, let s take a look at the syntax for the UPDATE command.
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