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1. In this example, we will insert a new TransactionDetails.Transactions row and insert an image into the Notes column. This image could be from a document scanner of the share purchase made, a copy of the written check from the bank account, or even a copy of the credit card receipt. As security is the byword in SQL Server, we won t be showing this, and I will use a picture found on my computer. 2. Enter the following code noting that we have a column alias of PhotoToLoad that is defined from the BULK operation and then used in the SELECT: INSERT INTO TransactionDetails.Transactions (CustomerId, TransactionType, DateEntered,Amount,Notes, RelatedProductId) SELECT 2, 1, GETDATE(),1000,PhotoToLoad.*, 1 FROM OPENROWSET (BULK 'd:\photo.tif', SINGLE_BLOB) PhotoToLoad 3. When you execute this code, you should see the following results:

As you can see in the preceding section, combining CREATE object permissions with schema ownership for users is a very precise way of specifying in what schemas a user can create objects. The precision of this approach is attractive when you want to tightly constrain the choice of where users can create objects, such as for novice users. However, experienced developers may benefit from another approach that makes it easy for a user to create objects in multiple schemas. This section illustrates one way to make it possible for a single user to enter all kinds of objects in multiple schemas. The sample for this section resides in CreatingObjectsInAnySchema.sql. The section has a single sample with three major elements. In the initial element, code sets up an environment that will allow the other two elements to work. This initial setup element also makes it easy to rerun the sample with different assignments for a local variable (@sname), which designates a schema name. The second element conditionally drops a table from a schema. This element reads the @sname local variable and conditionally drops one of two tables dbo.TrackPersons or sqllogin3.TrackPersons. The second element also detects and warns with a return message if @sname is set to a value other than dbo or sqllogin3.

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Figure 11-46. When severity is too low to set @@ERROR 6. By changing the severity to 11 or above, the @@ERROR setting will now be set to the message number within the RAISERROR. RAISERROR (50001,11,1,243) SELECT @@ERROR 7. The preceding code produces the same message as seen within our RAISERROR example, but as you can see in Figure 11-47, the error number setting now reflects that value placed in the msgnum parameter.

(1 row(s) affected)

The solution s third element adds a table to the schema specified by the @sname local variable The approach used here allows a single user to add a table to either of two schemas without direct ownership of either schema The code for the initial element of the solution follows As you can see, the first element starts by making NewDB2 the database context Next, the code conditionally drops TrackPersons tables from the dbo schema (schema_id = 1) and the sqllogin3 schema (schema_id = 5) Critically, the code assigns the sqllogin4 user to the db_ddladmin fixed database role The permissions for this role, which include CREATE, DROP, and ALTER for all database objects, operate at the database level and are not confined to any individual schema As a consequence, a user that is a member of the role can apply its permissions in any schema.

Figure 11-47. With a higher severity, the message number is set. Although a useful tool, it would be better to use the next error-handling routine to be demonstrated, TRY...CATCH.

The initial element opens an EXECUTE AS code block that holds the code for the other two solution elements The initial element concludes by opening an EXECUTE AS block for the sqllogin4 login You can adapt the sample in multiple ways to accommodate more than one user, such as using a stored procedure with a parameter to designate the user name A REVERT statement, which does not show in this excerpt, after the second solution s elements, returns the execution context to that for the user invoking the EXECUTE AS statement USE NewDB2 GO IF EXISTS(SELECT * FROM systables WHERE name = 'TrackPersons' AND schema_id = 1) DROP TABLE dboTrackPersons IF EXISTS(SELECT * FROM systables WHERE name = 'TrackPersons' AND schema_id = 5) DROP TABLE sqllogin3.

4. To update the row, first of all find the TransactionId of the row entered previously; in my case this was 24. Then we create a subquery in which we only return one column and one row. We can use this to set the value within a column. UPDATE TransactionDetails.Transactions SET Notes = ( SELECT PhotoToLoad.* FROM OPENROWSET (BULK 'd:\photo2.jpg', SINGLE_BLOB) PhotoToLoad) WHERE transactionId = 7 5. When you execute this code, you should see the following results:

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