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Note For the sake of thoroughness, I ll point out that there is, in fact, a library that can really modify a compiled Java class as the class is being loaded by a class loader. However, that library is an exceptional case that does not invalidate my main line of discussion in this chapter.

We ll define the fields to insert using ->fields and an array of key => value pairs where the key is the name of the field and value is what will be assigned to that field in that row Also note ->execute() at the end of the statement, which does just what it sounds like, executes the insert against the database $nid = db_insert('joke') ->fields(array( 'nid' => '4', 'vid' => 1, 'punchline' => 'And the pig said oink!', )) ->execute(); Next let s update all of the rows in the joke table, setting the punchline equal to Take my wife, please! , where the nid is greater than or equal to 3 I ll pass an array of fields and values to update using ->fields, and I ll set the condition that has to be met in order to update the values for those fields using the ->condition modifier.

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In this example, I am going to update the punchline field for any record in the joke table where the nid field is greater than or equal to 3 $num_updated = db_update('joke') ->fields(array( 'punchline' => 'Take my wife please!', )) ->condition('nid', 3, '>=') ->execute(); If I wanted to see how many rows were affected by the update, I could use the value assigned to $num_updated after the update is executed Finally let s delete all of the rows from the joke table where the punchline is equal to Take my wife please! I ll use the db_delete function and the ->condition modifier to specify the condition for deleting records from the table $num_deleted = db_delete('joke') ->condition('punchline', 'Take my wife please!') ->execute();.

Even though you might be able to modify a compiled Java or C# class at runtime if you are determined, doing so is generally not supported. On the other hand, many dynamic languages naturally support the addition and removal of methods and properties to and from a class at runtime. Moreover, we can also add or remove methods and properties to and from a particular instance of a class without affecting the other instances of the same class. The next part of this chapter will show you how to modify a class and its instances by adding methods or properties at runtime in Ruby, in Python, and, last but not least, in C# through the DLR.

There are various ways to retrieve query results depending on whether you need a single row or the whole result set, or whether you are planning to get a range of results for internal use or for display as a paged result set.

The following will create a network available share with the name userdata, mapped to the local drive c:\users\data. Network users will be able to browse for this share in their network explorer.

If all you need from the database is a single value, you can use the ->fetchField() method to retrieve that value. Here is an example of retrieving the total number of records from the joke table: $nbr_records = db_query("SELECT count(nid) FROM {joke}")->fetchField();

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