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Before continuing the exploration of stored procedures, we had to make a sojourn to review other methods of grouping Transact-SQL statements. The advantages and disadvantages of batches and scripts have led the designers of SQL Server to implement stored procedures as a prominent feature for DBAs. Batches are sets of Transact-SQL statements that are sent to SQL Server simultaneously. It is possible to set a batch explicitly in Query Analyzer and other tools by using the Go command or by highlighting a part of the code that needs to be executed. If SQL Server encounters a syntax error during parsing of the batch, further processing of that batch is stopped. Processing of other batches may continue. A script is an ordinary text file, usually with a .sql extension, that contains Transact-SQL statements. It is possible to generate a script with all the DDL statements needed to re-create a complete database and all the objects inside it. Script files can be opened and executed from SQL Server client utilities such as Query Analyzer, isql, and osql. Transactions are one of the most important concepts in SQL Server. Their use is required to keep a database consistent. Even if a developer is not explicitly using transactions, SQL Server treats each Transact-SQL statement as a separate transaction. The use of transactions can become complicated if a developer decides to nest them. Special care is required to handle the different behaviors of the Commit and Rollback statements. It is also possible to name transactions, but this practice introduces a new level of complexity that needs to be managed and therefore is not recommended. Savepoints allow developers to roll back a part of a transaction. This practice is not consistent with the basic concept that

6:

DiffGrams are relatively difficult to debug. There are two groups of DiffGram-related errors: XML parsing errors DiffGram and XSD schema files might not be valid

a transaction should be either completely committed or completely rolled back. However, in some cases, solutions based on Savepoint can be helpful. SQL Server uses locks to enforce different levels of isolation between transactions. Administrators and developers can set levels for connection or specify which lock will be used inside the Transact-SQL statement.

1. Create a database script for the Asset database. 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. 3. What is the problem with the following script

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How can you fix it 4. How do the Rollback Transaction and Commit Transaction statements affect @@trancount 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. 6. Is it okay to span transaction over multiple batches

ebugging and error handling seem like such negative topics. By admitting debugging as a necessary phase of development and error handling as a required practice, we seem to admit to weakness in our abilities as developers. But we are not the computers themselves: we cannot account for all contingencies when we write code. So, to find the error of our ways after the fact, we need a coherent approach to the identification and resolution of defects in our code and a coherent strategy for handling errors in our code as they occur.

The process of debugging is an integral part of both the development and stabilization phases of software production.

You have probably heard errors and defects found in software referred to as bugs. This word has found its way into our everyday language and reality so that we now seem to regard the bug as normal and inevitable like death and taxes. However, not many people know how this term actually entered the language. It happened in the dim, distant technological past when computers occupied whole rooms (if not buildings). On one occasion, technicians were investigating a malfunction on such a computer. Much to their surprise, they found the cause of the circuit malfunction to be a large moth that had been attracted by the heat and glow of the machine s vacuum tubes. Over time, all computer-related errors (particularly the ones that were difficult to explain) came to be known as bugs. Sometimes we anthropomorphize bugs give them human attributes. They can seem in turn capricious and malicious, but the bugs we experience in application and database development are not related to mythological folk such as gremlins. Bugs are very real, but their causes are inevitably human. Computers bear no malice toward users or developers, compilers do not play practical jokes, and operating systems are not being stubborn when they refuse to operate as expected. No, when you encounter an error, you can be

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