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You can format numbers and strings and use them as output or store them in files or databases without modifications. The more complex data types arrays and objects can also be stored, but that generally requires some advanced formatting or multiple records in the database (one for each element in the array). This was demonstrated in recipe 10-6, where one function generated multiple arrays and another function presented the generated data in an HTML table structure. However, using user-defined functions to convert arrays and objects into data that can be stored in a database or file is not the fastest or simplest solution. This is where the built-in functions serialize() and unsearialize() become handy. These functions can convert an array or an object into a string representation that can be stored in a single column in a database (or a file) and later retrieved and converted to the original data type. The serialize() function takes a PHP variable and converts it into a string representation, and the unserialize() function takes a string (most often created with serialize()) and converts it to its original type.

One or more columns can be added to a table in a single statement, using the ADD clause. Each ADD clause includes a full column definition, which follows the same syntax as column definitions in CREATE TABLE. Multiple ADD clauses are separated with commas. This is the syntax:

Caution When setting the minimum and maximum numbers on the ObjectPooling attribute, be aware that the maximum is a fixed size. If the pool reaches the maximum number of objects, additional requests for an object will wait until a pooled object becomes available.

ALTER TABLE table ADD <col_def> <col_def> = col {<datatype> | [COMPUTED [BY] (<expr>) | domain} [DEFAULT {literal |NULL |USER}] [NOT NULL] [<col_constraint>] [COLLATE collation] <col_constraint> = [CONSTRAINT constraint] <constraint_def> [<col_constraint>] <constraint_def>=

16 PRIMARY KEY | UNIQUE | CHECK (<search_condition>) | REFERENCES other_table [(other_col [, other_col ...])] [ON DELETE {NO ACTION|CASCADE|SET DEFAULT|SET NULL}] [ON UPDATE {NO ACTION|CASCADE|SET DEFAULT|SET NULL}]

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Note Variables of the resource type cannot be serialized. They contain data created and maintained by

The following statement adds a column, EMP_NO, to the EMPLOYEE table using the EMPNO domain:

ALTER TABLE EMPLOYEE ADD EMP_NO EMPNO NOT NULL;

The amount of time the client will wait is configurable and can be set using one of the overloaded constructors of the ObjectPooling attribute. If the wait time has expired and an object is still not available, the client will receive an exception. The best way to fine-tune the size of the object pool is to monitor actual usage.

Here we add two columns, EMAIL_ID and LEAVE_STATUS, to the EMPLOYEE table:

ALTER TABLE EMPLOYEE ADD EMAIL_ID VARCHAR(10) NOT NULL, ADD LEAVE_STATUS DEFAULT 10 INTEGER NOT NULL;

< php // Example 10-8-1.php $fruits = array( 'apple', 'orange', 'pear', 'apricot', 'apple', 'apricot', 'orange', 'orange' ); $str = serialize($fruits); echo "$str\n"; $new_fruits = unserialize($str); $new_fruits[] = 'apple'; print_r($new_fruits); >

Integrity constraints can be included for columns that you add to the table. For example, a UNIQUE constraint could have been included for the EMAIL_ID column in the previous statement:

ALTER ADD ADD ADD TABLE EMPLOYEE EMAIL_ID VARCHAR(10) NOT NULL, LEAVE_STATUS DEFAULT 10 INTEGER NOT NULL, CONSTRAINT UQ_EMAIL_ID UNIQUE(EMAIL_ID);

See recipes 8-2 (Implementing a Server Application) and 8-5 (Activating Components Just-in-Time).

ALTER TABLE EMPLOYEE ADD EMAIL_ID VARCHAR(10) NOT NULL UNIQUE, ADD LEAVE_STATUS DEFAULT 10 INTEGER NOT NULL;

This example uses the serialize() function to convert the contents of an array to a string. The string is printed and then converted to a new array, where you add a new element. a:8:{i:0;s:5:"apple";i:1;s:6:"orange";i:2;s:4:"pear";i:3;s:7:"apricot";i:4; s:5:"apple";i:5;s:7:"apricot";i:6;s:6:"orange";i:7;s:6:"orange";} Array ( [0] => apple [1] => orange [2] => pear [3] => apricot [4] => apple [5] => apricot [6] => orange [7] => orange [8] => apple ) Database-driven websites are often designed in a way so the content stored in a database can be retrieved and presented without much formatting. When a web page is created from numeric data and processing, it can be useful to cache the results for easy access and presentation for the next user who requests the same page. You can do this by serializing the results, storing them in the database or in a file, and then checking if a cached version exists before a new page is generated. The next example demonstrates how to build a class that can cache an array of values between requests. The class will work on files, but you can easily change it to store the values in a database. The caching class is stored in an include file (cache.inc) so it can be used in many different applications. Table 10-7 lists the methods. Table 10-7. Caching Class Methods

The ADD CONSTRAINT clause can be included to add table-level constraints relating to new or existing columns. This is the syntax:

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