Doctrine 2.5 GUID field default value

Question

I am trying to set a default value for an UUID type field

/**
 * @var int
 *
 * @ORM\Column(name="uuid", type="guid", options={"default"="uuid_generate_v4()"})
 * @ORM\Id()
 * @ORM\GeneratedValue(strategy="UUID")
 */
private $uuid;

However this sets executes

ALTER TABLE store ALTER uuid SET DEFAULT 'uuid_generate_v4()';

and takes it as text. How do I define a DB function as default in doctrine annotations?

Answer 1

On creation table you can use this annotation

/**
 * @ORM\Column(name="uuid", type="guid", columnDefinition="DEFAULT uuid_generate_v4()", options={"comment"="Column Comment Here"})
 * @ORM\Id()
 * @ORM\GeneratedValue(strategy="UUID")
 */
private $uuid;

The ColumnDefinition append the content to DDL see Doctrine Documentation

The SQL output for this config is

ALTER TABLE table_name ADD uuid DEFAULT uuid_generate_v4();
COMMENT ON COLUMN table_name.uuid IS 'Column Comment Here';

These annotation does nothing on CHANGE COLUMN. Only works on ADD COLUMN generated SQL. You must recreate the column or change your table by hand.

IMPORTANT NOTE: For those that looking for create UUID Column Type in PostgreSQL, keep in mind that you need to enable some Extension to use functions that create uuid-hashes.

In the example, uuid_generate_v4() is derived from UUID-OSSP and older versions of PostgreSQL don't support it. Instead UUID-OSSP you can use gen_random_uuid() function from PGCRYPTO . The UUID resultant is the same version (v4). Again, older versions doesn't support it.

Just remember to Install the Extension with Create Extension .

CREATE EXTENSION IF NOT EXISTS "uuid-ossp"; // OR
CREATE EXTENSION IF NOT EXISTS "pgcrypto";

ANOTHER IMPORTANT NOTE: In some PostgreSQL installations (like CentOS), extensions are not included by default. You must install them.

For CentOS/RHEL you need to install postgresql-contrib . Pay attention to the version of your PostgreSQL. Ie for version 9.5 you must use postgresql95-contrib

My Privileges are weak

There's a trick to create uuid hashes without extensions. Just use the instruction above.

uuid_in(md5(random()::text || clock_timestamp()::text)::cstring);

If your version suport ::UUID casting, use

md5(random()::text || clock_timestamp()::text)::uuid