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ALTER TABLE name ADD [CONSTRAINT constraint] <tconstraint_opt>;

where tconstraint_opt can be a PRIMARY KEY, FOREIGN KEY, UNIQUE, or CHECK constraint. The CONSTRAINT constraint phrase is omitted if you do not care to name the constraint yourself.

__construct() Check() Save() SetValue() GetValue()

You ve implemented a managed component that should be used only by other components in the same COM+ application. You d like to prevent it from being used directly by clients. Is there a way to do this

For example, to add a UNIQUE constraint to the EMPLOYEE table, you might use this statement:

ALTER TABLE EMPLOYEE ADD CONSTRAINT UQ_PHONE_EXT UNIQUE(PHONE_EXT);

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Sometimes, you need to make a change to a column that cannot be achieved with ALTER TABLE. Examples might be where a column that is storing international language items in character set NONE needs to be changed to another character set to correct your design error, or a telephone number, originally defined by someone as an integer, needs to be stored as an 18-character column instead. In the first case, it is not possible to change the character set of a column, so you need a workaround that both preserves the data and makes it available in the correct character set. In the second case, simply changing the data type of the telephone number column will not work if we already have existing integer data in the column. We want to keep the actual numbers, but we have to convert them to strings. That cannot be done in the current structure, because an integer column cannot store a string. The workaround entails creating a temporary column in your table, with the correct attributes, and parking the data there while you drop and re-create the original column. 1. Add a temporary column to the table that has a definition with the new attributes you need.

Class constructor. Initiates properties. Checks if the cache file exists and if it is still valid. Writes the cached value to the file. Adds or updates a value in the cache. Retrieves a value in the cache.

ALTER TABLE PERSONNEL ADD TEMP_COL VARCHAR(18); COMMIT;

By default, COM+ components are available to all clients, including managed and COM clients. However, one way to restrict access to a component is to mark it as private. This is done with the PrivateComponent attribute, for example: [PrivateComponent] public class MyPrivateClass : ServicedComponent { } This is a class-level attribute that must be applied to each class that you wish to make private. Once the attribute is applied, the class is accessible only from other components in the same COM+ application. If an attempt is made to access the class from outside of the current application, an exception will be thrown.

Copy the data from the column to be changed to the temporary column, massaging it appropriately (e.g., applying a character set introducer to convert the text data to the correct character set or, in our example, casting it appropriately).

UPDATE PERSONNEL SET TEMP_COL = CAST(TEL_NUMBER AS VARCHAR(18)) WHERE TEL_NUMBER IS NOT NULL; COMMIT;

< php // Example cache.inc class Cache { private $name = null; private $value = array(); private $ttl; function __construct($name, $ttl = 3600) { $this->name = $name; $this->ttl = $ttl; } function Check() { $cached = false; $file_name = $this->name . ".cache"; if (file_exists($file_name)) { $modified = filemtime($file_name); if (time() - $this->ttl < $modified) { $fp = fopen($file_name, "rt"); if ($fp) { $temp_value = fread($fp, filesize($file_name)); fclose($fp); $this->value = unserialize($temp_value); $cached = true; } } } return $cached; } function Save() { $file_name = $this->name . ".cache"; $fp = fopen($file_name, "wt"); if ($fp) { fwrite($fp, serialize($this->value)); fclose($fp); } } function SetValue($key, $value) { $this->value[$key] = $value; }

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After verifying that the data in the temporary column has been changed as planned, drop the old column.

Server 2003). It is not supported in Windows 2000. If you use this attribute, you will be limiting the versions of the operating system that your application supports.

ALTER TABLE PERSONNEL DROP TEL_NUMBER;

function GetValue($key) { if (isset($this->value[$key])) { return $this->value[$key]; } else { return NULL; } } } >

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