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When working with T-SQL, it is important to have some sort of error handling to cater to those times when something goes wrong. Errors can be of different varieties; for example, you might expect at least one row of data to be returned from a query, and then you receive no rows. However, what we are discussing here is when SQL Server informs us there is something more drastically wrong. We have seen some errors throughout the book, and even in this chapter. There are two methods of error catching we can employ in such cases. The first uses a system variable, @@ERROR.

Inserting and updating images, movies, Excel spreadsheets, or any data that can be accessed via an OLE DB data provider into rows of data uses a T-SQL function called OPENROWSET. OLE DB is a method used to access data information from a program. This can be Excel, text files, image files, and so on. Some OLE DB providers offer basic functionality, whereas others allow you to work with the data within your program as if you were using the raw data s own program. For example, there is an OLE DB provider that allows you to work with Excel data in, for example, a C# program as if you were in Excel. We won t look at the OPENROWSET function extensively, as it is quite an advanced area, but bulk loading binary data located locally on our computer doesn t need any provider or connection information, and so it is very straightforward.

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Being in this role, along with having CREATE TABLE permission, conveys the authority to create a new table in the sqllogin3 schema IF EXISTS(SELECT * FROM systables WHERE name = 'TrackPersons' AND schema_id = 5) DROP TABLE sqllogin3TrackPersons EXEC sp_droprolemember 'sqllogin3SchemaOwner', 'sqllogin3' In this case, rerunning the EXECUTE AS block fails The only significant change is that the sqllogin3 user is not a member of the sqllogin3SchemaOwner role Because this role is the owner of the sqllogin3 schema, the role conveys that status to its members Successfully using CREATE TABLE permission to add a new table in a schema requires owner status for a user The third sample in this section adds the TrackPersons table to the sqllogin3 schema from the sqllogin4 user After confirming whether the CREATE TABLE statement succeeds, the script erases the table to help simplify the interpretation of the next sample.

This is the most basic of error handling. It has served SQL Server developers well over the years, but it can be cumbersome. When an error occurs, such as you have seen as we have gone through the book creating and manipulating objects, a global variable, @@ERROR, would have been populated with the SQL Server error message number. Similarly, if you try to do something with a set of data that is invalid, such as dividing a number by zero or exceeding the number of digits allowed in a numeric data type, then SQL Server will populate this variable for you to inspect. The downside is that the @@ERROR variable setting only lasts for the next statement following the line of code that has been executed; therefore, when you think there might be problems, you need to either pass the data to a local variable or inspect it straight away. The first example demonstrates this.

The script begins by granting CREATE TABLE permission to the sqllogin4 user This occurs from a sysadmin member (or other login with permission to assign this permission) There is no need to remove a copy of the TrackPersons table in the sqllogin3 schema before the CREATE TABLE statement because the second sample failed to add a new table The EXECUTE AS block for the third sample is nearly the same as the one for the first sample This sample designates the table name as sqllogin3TrackPersons instead of just TrackPersons as in the first sample It is necessary to specify a schema qualifier as part of the table s name in the third sample because the sqllogin3 schema is not the default schema for the sqllogin4 user After a query of the sys.

Note Remember that although we are using an image here, it could be music files, movies, or any data at

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