Doctrine_manual-1-2-en

Chapter 15: Inheritance 235
name: string(30)
username: string(20)
password: string(16)
created: integer(11)
User:
inheritance:
extends: Entity
type: concrete
Group:
tableName: groups
inheritance:
extends: Entity
type: concrete
Lets check the SQL that is generated by the above models:
// test.php
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15-15
// ...
$sql = Doctrine_Core::generateSqlFromArray(array('Entity', 'User',
'Group'));
echo $sql[0] . "\n";
echo $sql[1] . "\n";
echo $sql[2] . "\n";
The above code would output the following SQL query:
CREATE TABLE user (id BIGINT AUTO_INCREMENT,
name VARCHAR(30),
username VARCHAR(20),
password VARCHAR(16),
created BIGINT,
PRIMARY KEY(id)) ENGINE = INNODB
CREATE TABLE groups (id BIGINT AUTO_INCREMENT,
name VARCHAR(30),
username VARCHAR(20),
password VARCHAR(16),
created BIGINT,
PRIMARY KEY(id)) ENGINE = INNODB
CREATE TABLE entity (id BIGINT AUTO_INCREMENT,
name VARCHAR(30),
username VARCHAR(20),
password VARCHAR(16),
created BIGINT,
PRIMARY KEY(id)) ENGINE = INNODB
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15-16
Column Aggregation
In the following example we have one database table called entity. Users and groups are
both entities and they share the same database table.
The entity table has a column called type which tells whether an entity is a group or a
user. Then we decide that users are type 1 and groups type 2.
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