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This hook is used to modify queries created elsewhere in Drupal so that you do not have to hack modules directly. All Dynamic Select query objects are passed through hook_query_alter() by the execute() method, immediately before the query string is compiled. That gives modules the opportunity to manipulate the query as desired. hook_query_alter() accepts a single parameter: the Select query object itself. As an example of how hook_query_alter() works, a module named dbtest utilizes hook_query_alter() to modify two queries. The first modification happens when a query is found that has a tag of db_test_alter_add_range . If that tag is found, the query is modified by adding range(0,2) to the query. The second modification occurs when a query with a tag of db_test_alter_add_join is found. In this case, a join is added between the test and people tables.

It would be an extremely bad thing if the money were removed from the savings account, but not transferred to the checking account (due to some error on the bank s part) because then you would be out $500.00! However, if these steps are wrapped up into a database transaction, the DBMS ensures that all related steps occur as a single unit. If any part of the transaction fails, the entire operation is rolled back to the original state. On the other hand, if all steps succeed, the transaction is committed.

Note You might be familiar with the acronym ACID from looking at transactional literature. This represents the four key properties of a prim-and-proper transaction: Atomic (all or nothing); Consistent (data remains stable throughout the transaction); Isolated (transactions do not step on each other s feet); and Durable (transactions are saved and logged).

Note Tags are strings that identify a query. A query may have any number of tags. Tags are used to mark a query so that alter hooks may decide if they wish to take action. Tags should be all lower-case and contain only letters, numbers, and underscores, and start with a letter. That is, they should follow the same rules as PHP identifiers in general.

It turns out that the .NET platform supports transactions in a variety of ways. This chapter will look at the transaction object of your ADO.NET data provider (SqlTransaction, in the case of System.Data.SqlClient). The .NET base class libraries also provide transactional support within numerous APIs, including the following: System.EnterpriseServices: This namespace (located in the System.EnterpriseServices.dll assembly) provides types that allow you to integrate with the COM+ runtime layer, including its support for distributed transactions. System.Transactions: This namespace (located in the System.Transactions.dll assembly) contains classes that allow you to write your own transactional applications and resource managers for a variety of services (e.g., MSMQ, ADO.NET, and COM+). Windows Communication Foundation: The WCF API provides services to facilitate transactions with various distributed binding classes. Windows Workflow Foundations: The WF API provides transactional support for workflow activities.

In addition to the baked-in transactional support found within the .NET base class libraries, it is also possible to use the SQL language of your database management system. For example, you could author a stored procedure that uses the BEGIN TRANSACTION, ROLLBACK, and COMMIT statements.

function dbtest_query_alter(SelectQuery $query) { // you might add a range if ($query->hasTag('db_test_alter_add_range')) { $query->range(0, 2); } // or add a join if ($query->hasTag('db_test_alter_add_join')) { $people_alias = $query->join('test', 'people', "test_task.pid=people.id"); $name_field = $query->addField('name', 'people', 'name'); $query->condition($people_alias . '.id', 2); } ... >

While transactional-aware types exist throughout the base class libraries, you will focus on transaction objects found within an ADO.NET data provider, all of which derive from DBTransaction and implement the IDbTransaction interface. Recall from the beginning of this chapter that -IDbTransaction defines a handful of members:

public interface IDbTransaction : IDisposable { IDbConnection Connection { get; } IsolationLevel IsolationLevel { get; } void Commit(); void Rollback(); } Notice the Connection property, which returns a reference to the connection object that initiated the current transaction (as you ll see, you obtain a transaction object from a given connection object). You call the Commit() method when each of your database operations have succeeded. Doing this causes each of the pending changes to be persisted in the data store. Conversely, you can call the Rollback() method in the event of a runtime exception, which informs the DMBS to disregard any pending changes, leaving the original data intact.