Phinx relies on migrations in order to transform your database. Each migration
is represented by a PHP class in a unique file. It is preferred that you write
your migrations using the Phinx PHP API, but raw SQL is also supported.
Creating a New Migration
Generating a skeleton migration file
Let’s start by creating a new Phinx migration. Run Phinx using the create
command:
$ vendor/bin/phinx create MyNewMigration
This will create a new migration in the format
YYYYMMDDHHMMSS_my_new_migration.php
, where the first 14 characters are
replaced with the current timestamp down to the second.
If you have specified multiple migration paths, you will be asked to select
which path to create the new migration in.
Phinx automatically creates a skeleton migration file with a single method:
<?php
use Phinx\Migration\AbstractMigration;
class MyNewMigration extends AbstractMigration
{
/**
* Change Method.
*
* Write your reversible migrations using this method.
*
* More information on writing migrations is available here:
* https://book.cakephp.org/phinx/0/en/migrations.html#the-change-method
*
* Remember to call "create()" or "update()" and NOT "save()" when working
* with the Table class.
*
*/
public function change()
{
}
}
All Phinx migrations extend from the AbstractMigration
class. This class
provides the necessary support to create your database migrations. Database
migrations can transform your database in many ways, such as creating new
tables, inserting rows, adding indexes and modifying columns.
The Change Method
Phinx 0.2.0 introduced a new feature called reversible migrations. This feature
has now become the default migration method. With reversible migrations, you
only need to define the up
logic, and Phinx can figure out how to migrate
down automatically for you. For example:
<?php
use Phinx\Migration\AbstractMigration;
class CreateUserLoginsTable extends AbstractMigration
{
public function change()
{
// create the table
$table = $this->table('user_logins');
$table->addColumn('user_id', 'integer')
->addColumn('created', 'datetime')
->create();
}
}
When executing this migration, Phinx will create the user_logins
table on
the way up and automatically figure out how to drop the table on the way down.
Please be aware that when a change
method exists, Phinx will automatically
ignore the up
and down
methods. If you need to use these methods it is
recommended to create a separate migration file.
Note
When creating or updating tables inside a change()
method you must use
the Table create()
and update()
methods. Phinx cannot automatically
determine whether a save()
call is creating a new table or modifying an
existing one.
The following actions are reversible when done through the Table API in Phinx,
and will be automatically reversed:
Creating a table
Renaming a table
Adding a column
Renaming a column
Adding an index
Adding a foreign key
If a command cannot be reversed then Phinx will throw an
IrreversibleMigrationException
when it’s migrating down. If you wish to
use a command that cannot be reversed in the change function, you can use an
if statement with $this->isMigratingUp()
to only run things in the
up or down direction. For example:
<?php
use Phinx\Migration\AbstractMigration;
class CreateUserLoginsTable extends AbstractMigration
{
public function change()
{
// create the table
$table = $this->table('user_logins');
$table->addColumn('user_id', 'integer')
->addColumn('created', 'datetime')
->create();
if ($this->isMigratingUp()) {
$table->insert([['user_id' => 1, 'created' => '2020-01-19 03:14:07']])
->save();
}
}
}
The Up Method
The up method is automatically run by Phinx when you are migrating up and it
detects the given migration hasn’t been executed previously. You should use the
up method to transform the database with your intended changes.
The Down Method
The down method is automatically run by Phinx when you are migrating down and
it detects the given migration has been executed in the past. You should use
the down method to reverse/undo the transformations described in the up method.
The Init Method
The init()
method is run by Phinx before the migration methods if it exists.
This can be used for setting common class properties that are then used within
the migration methods.
The Should Execute Method
The shouldExecute()
method is run by Phinx before executing the migration.
This can be used to prevent the migration from being executed at this time. It always
returns true by default. You can override it in your custom AbstractMigration
implementation.
Executing Queries
Queries can be executed with the execute()
and query()
methods. The
execute()
method returns the number of affected rows whereas the
query()
method returns the result as a
PDOStatement. Both methods
accept an optional second parameter $params
which is an array of elements,
and if used will cause the underlying connection to use a prepared statement.
<?php
use Phinx\Migration\AbstractMigration;
class MyNewMigration extends AbstractMigration
{
/**
* Migrate Up.
*/
public function up()
{
// execute()
$count = $this->execute('DELETE FROM users'); // returns the number of affected rows
// query()
$stmt = $this->query('SELECT * FROM users'); // returns PDOStatement
$rows = $stmt->fetchAll(); // returns the result as an array
// using prepared queries
$count = $this->execute('DELETE FROM users WHERE id = ?', [5]);
$stmt = $this->query('SELECT * FROM users WHERE id > ?', [5]); // returns PDOStatement
$rows = $stmt->fetchAll();
}
/**
* Migrate Down.
*/
public function down()
{
}
}
Note
These commands run using the PHP Data Objects (PDO) extension which
defines a lightweight, consistent interface for accessing databases
in PHP. Always make sure your queries abide with PDOs before using
the execute()
command. This is especially important when using
DELIMITERs during insertion of stored procedures or triggers which
don’t support DELIMITERs.
Note
If you wish to execute multiple queries at once, you may not also use the prepared
variant of these functions. When using prepared queries, PDO can only execute
them one at a time.
Warning
When using execute()
or query()
with a batch of queries, PDO doesn’t
throw an exception if there is an issue with one or more of the queries
in the batch.
As such, the entire batch is assumed to have passed without issue.
If Phinx was to iterate any potential result sets, looking to see if one
had an error, then Phinx would be denying access to all the results as there
is no facility in PDO to get a previous result set
nextRowset() -
but no previousSet()
).
So, as a consequence, due to the design decision in PDO to not throw
an exception for batched queries, Phinx is unable to provide the fullest
support for error handling when batches of queries are supplied.
Fortunately though, all the features of PDO are available, so multiple batches
can be controlled within the migration by calling upon
nextRowset()
and examining errorInfo.
Working With Tables
The Table Object
The Table object is one of the most useful APIs provided by Phinx. It allows
you to easily manipulate database tables using PHP code. You can retrieve an
instance of the Table object by calling the table()
method from within
your database migration.
<?php
use Phinx\Migration\AbstractMigration;
class MyNewMigration extends AbstractMigration
{
/**
* Migrate Up.
*/
public function up()
{
$table = $this->table('tableName');
}
/**
* Migrate Down.
*/
public function down()
{
}
}
You can then manipulate this table using the methods provided by the Table
object.
Saving Changes
When working with the Table object, Phinx stores certain operations in a
pending changes cache. Once you have made the changes you want to the table,
you must save them. To perform this operation, Phinx provides three methods,
create()
, update()
, and save()
. create()
will first create
the table and then run the pending changes. update()
will just run the
pending changes, and should be used when the table already exists. save()
is a helper function that checks first if the table exists and if it does not
will run create()
, else it will run update()
.
As stated above, when using the change()
migration method, you should always
use create()
or update()
, and never save()
as otherwise migrating
and rolling back may result in different states, due to save()
calling
create()
when running migrate and then update()
on rollback. When
using the up()
/down()
methods, it is safe to use either save()
or
the more explicit methods.
When in doubt with working with tables, it is always recommended to call
the appropriate function and commit any pending changes to the database.
Creating a Table
Creating a table is really easy using the Table object. Let’s create a table to
store a collection of users.
<?php
use Phinx\Migration\AbstractMigration;
class MyNewMigration extends AbstractMigration
{
public function change()
{
$users = $this->table('users');
$users->addColumn('username', 'string', ['limit' => 20])
->addColumn('password', 'string', ['limit' => 40])
->addColumn('password_salt', 'string', ['limit' => 40])
->addColumn('email', 'string', ['limit' => 100])
->addColumn('first_name', 'string', ['limit' => 30])
->addColumn('last_name', 'string', ['limit' => 30])
->addColumn('created', 'datetime')
->addColumn('updated', 'datetime', ['null' => true])
->addIndex(['username', 'email'], ['unique' => true])
->create();
}
}
Columns are added using the addColumn()
method. We create a unique index
for both the username and email columns using the addIndex()
method.
Finally calling create()
commits the changes to the database.
Note
Phinx automatically creates an auto-incrementing primary key column called id
for every
table.
The id
option sets the name of the automatically created identity field, while the primary_key
option selects the field or fields used for primary key. id
will always override the primary_key
option unless it’s set to false. If you don’t need a primary key set id
to false without
specifying a primary_key
, and no primary key will be created.
To specify an alternate primary key, you can specify the primary_key
option
when accessing the Table object. Let’s disable the automatic id
column and
create a primary key using two columns instead:
<?php
use Phinx\Migration\AbstractMigration;
class MyNewMigration extends AbstractMigration
{
public function change()
{
$table = $this->table('followers', ['id' => false, 'primary_key' => ['user_id', 'follower_id']]);
$table->addColumn('user_id', 'integer')
->addColumn('follower_id', 'integer')
->addColumn('created', 'datetime')
->create();
}
}
Setting a single primary_key
doesn’t enable the AUTO_INCREMENT
option.
To simply change the name of the primary key, we need to override the default id
field name:
<?php
use Phinx\Migration\AbstractMigration;
class MyNewMigration extends AbstractMigration
{
public function up()
{
$table = $this->table('followers', ['id' => 'user_id']);
$table->addColumn('follower_id', 'integer')
->addColumn('created', 'timestamp', ['default' => 'CURRENT_TIMESTAMP'])
->create();
}
}
In addition, the MySQL adapter supports following options:
Option |
Description |
comment |
set a text comment on the table |
row_format |
set the table row format |
engine |
define table engine (defaults to ``InnoDB``) |
collation |
define table collation (defaults to ``utf8mb4_unicode_ci``) |
signed |
whether the primary key is signed (defaults to ``false``) |
limit |
set the maximum length for the primary key |
By default, the primary key is unsigned
.
To simply set it to be signed just pass signed
option with a true
value:
<?php
use Phinx\Migration\AbstractMigration;
class MyNewMigration extends AbstractMigration
{
public function change()
{
$table = $this->table('followers', ['signed' => false]);
$table->addColumn('follower_id', 'integer')
->addColumn('created', 'timestamp', ['default' => 'CURRENT_TIMESTAMP'])
->create();
}
}
The PostgreSQL adapter supports the following options:
Option |
Description |
comment |
set a text comment on the table |
To view available column types and options, see Valid Column Types for details.
Determining Whether a Table Exists
You can determine whether or not a table exists by using the hasTable()
method.
<?php
use Phinx\Migration\AbstractMigration;
class MyNewMigration extends AbstractMigration
{
/**
* Migrate Up.
*/
public function up()
{
$exists = $this->hasTable('users');
if ($exists) {
// do something
}
}
/**
* Migrate Down.
*/
public function down()
{
}
}
Dropping a Table
Tables can be dropped quite easily using the drop()
method. It is a
good idea to recreate the table again in the down()
method.
Note that like other methods in the Table
class, drop
also needs save()
to be called at the end in order to be executed. This allows phinx to intelligently
plan migrations when more than one table is involved.
<?php
use Phinx\Migration\AbstractMigration;
class MyNewMigration extends AbstractMigration
{
/**
* Migrate Up.
*/
public function up()
{
$this->table('users')->drop()->save();
}
/**
* Migrate Down.
*/
public function down()
{
$users = $this->table('users');
$users->addColumn('username', 'string', ['limit' => 20])
->addColumn('password', 'string', ['limit' => 40])
->addColumn('password_salt', 'string', ['limit' => 40])
->addColumn('email', 'string', ['limit' => 100])
->addColumn('first_name', 'string', ['limit' => 30])
->addColumn('last_name', 'string', ['limit' => 30])
->addColumn('created', 'datetime')
->addColumn('updated', 'datetime', ['null' => true])
->addIndex(['username', 'email'], ['unique' => true])
->save();
}
}
Renaming a Table
To rename a table access an instance of the Table object then call the
rename()
method.
<?php
use Phinx\Migration\AbstractMigration;
class MyNewMigration extends AbstractMigration
{
/**
* Migrate Up.
*/
public function up()
{
$table = $this->table('users');
$table
->rename('legacy_users')
->update();
}
/**
* Migrate Down.
*/
public function down()
{
$table = $this->table('legacy_users');
$table
->rename('users')
->update();
}
}
Changing the Primary Key
To change the primary key on an existing table, use the changePrimaryKey()
method.
Pass in a column name or array of columns names to include in the primary key, or null
to drop the primary key.
Note that the mentioned columns must be added to the table, they will not be added implicitly.
<?php
use Phinx\Migration\AbstractMigration;
class MyNewMigration extends AbstractMigration
{
/**
* Migrate Up.
*/
public function up()
{
$users = $this->table('users');
$users
->addColumn('username', 'string', ['limit' => 20, 'null' => false])
->addColumn('password', 'string', ['limit' => 40])
->save();
$users
->addColumn('new_id', 'integer', ['null' => false])
->changePrimaryKey(['new_id', 'username'])
->save();
}
/**
* Migrate Down.
*/
public function down()
{
}
}
Working With Columns
Valid Column Types
Column types are specified as strings and can be one of:
binary
boolean
char
date
datetime
decimal
float
double
smallinteger
integer
biginteger
string
text
time
timestamp
uuid
In addition, the MySQL adapter supports enum
, set
, blob
, tinyblob
, mediumblob
, longblob
, bit
and json
column types
(json
in MySQL 5.7 and above). When providing a limit value and using binary
, varbinary
or blob
and its subtypes, the retained column
type will be based on required length (see Limit Option and MySQL for details);
In addition, the Postgres adapter supports interval
, json
, jsonb
, uuid
, cidr
, inet
and macaddr
column types
(PostgreSQL 9.3 and above).
Valid Column Options
The following are valid column options:
For any column type:
Option |
Description |
limit |
set maximum length for strings, also hints column types in adapters (see note below) |
length |
alias for limit |
default |
set default value or action |
null |
allow NULL values, defaults to true (setting identity will override default to false ) |
after |
specify the column that a new column should be placed after, or use \Phinx\Db\Adapter\MysqlAdapter::FIRST to place the column at the start of the table (only applies to MySQL) |
comment |
set a text comment on the column |
For decimal
columns:
Option |
Description |
precision |
combine with scale set to set decimal accuracy |
scale |
combine with precision to set decimal accuracy |
signed |
enable or disable the unsigned option (only applies to MySQL) |
For enum
and set
columns:
Option |
Description |
values |
Can be a comma separated list or an array of values |
For smallinteger
, integer
and biginteger
columns:
Option |
Description |
identity |
enable or disable automatic incrementing (if enabled, will set null: false if null option is not set) |
signed |
enable or disable the unsigned option (only applies to MySQL) |
For Postgres, when using identity
, it will utilize the serial
type appropriate for the integer size, so that
smallinteger
will give you smallserial
, integer
gives serial
, and biginteger
gives bigserial
.
For timestamp
columns:
Option |
Description |
default |
set default value (use with CURRENT_TIMESTAMP ) |
update |
set an action to be triggered when the row is updated (use with CURRENT_TIMESTAMP ) (only applies to MySQL) |
timezone |
enable or disable the with time zone option for time and timestamp columns (only applies to Postgres) |
You can add created_at
and updated_at
timestamps to a table using the addTimestamps()
method. This method accepts
three arguments, where the first two allow setting alternative names for the columns while the third argument allows you to
enable the timezone
option for the columns. The defaults for these arguments are created_at
, updated_at
, and false
respectively. For the first and second argument, if you provide null
, then the default name will be used, and if you provide
false
, then that column will not be created. Please note that attempting to set both to false
will throw a
\RuntimeException
. Additionally, you can use the addTimestampsWithTimezone()
method, which is an alias to
addTimestamps()
that will always set the third argument to true
(see examples below). The created_at
column will
have a default set to CURRENT_TIMESTAMP
. For MySQL only, update_at
column will have update set to
CURRENT_TIMESTAMP
.
<?php
use Phinx\Migration\AbstractMigration;
class MyNewMigration extends AbstractMigration
{
/**
* Migrate Change.
*/
public function change()
{
// Use defaults (without timezones)
$table = $this->table('users')->addTimestamps()->create();
// Use defaults (with timezones)
$table = $this->table('users')->addTimestampsWithTimezone()->create();
// Override the 'created_at' column name with 'recorded_at'.
$table = $this->table('books')->addTimestamps('recorded_at')->create();
// Override the 'updated_at' column name with 'amended_at', preserving timezones.
// The two lines below do the same, the second one is simply cleaner.
$table = $this->table('books')->addTimestamps(null, 'amended_at', true)->create();
$table = $this->table('users')->addTimestampsWithTimezone(null, 'amended_at')->create();
// Only add the created_at column to the table
$table = $this->table('books')->addTimestamps(null, false);
// Only add the updated_at column to the table
$table = $this->table('users')->addTimestamps(false);
// Note, setting both false will throw a \RuntimeError
}
}
For boolean
columns:
Option |
Description |
signed |
enable or disable the unsigned option (only applies to MySQL) |
For string
and text
columns:
Option |
Description |
collation |
set collation that differs from table defaults (only applies to MySQL) |
encoding |
set character set that differs from table defaults (only applies to MySQL) |
For foreign key definitions:
Option |
Description |
update |
set an action to be triggered when the row is updated |
delete |
set an action to be triggered when the row is deleted |
constraint |
set a name to be used by foreign key constraint |
You can pass one or more of these options to any column with the optional
third argument array.
Limit Option and MySQL
When using the MySQL adapter, there are a couple things to consider when working with limits:
When using a string
primary key or index on MySQL 5.7 or below, or the MyISAM storage engine, and the default charset of utf8mb4_unicode_ci
, you must specify a limit less than or equal to 191, or use a different charset.
Additional hinting of database column type can be made for integer
, text
, blob
, tinyblob
, mediumblob
, longblob
columns. Using limit
with one the following options will modify the column type accordingly:
Limit |
Column Type |
BLOB_TINY |
TINYBLOB |
BLOB_REGULAR |
BLOB |
BLOB_MEDIUM |
MEDIUMBLOB |
BLOB_LONG |
LONGBLOB |
TEXT_TINY |
TINYTEXT |
TEXT_REGULAR |
TEXT |
TEXT_MEDIUM |
MEDIUMTEXT |
TEXT_LONG |
LONGTEXT |
INT_TINY |
TINYINT |
INT_SMALL |
SMALLINT |
INT_MEDIUM |
MEDIUMINT |
INT_REGULAR |
INT |
INT_BIG |
BIGINT |
For binary
or varbinary
types, if limit is set greater than allowed 255 bytes, the type will be changed to the best matching blob type given the length.
<?php
use Phinx\Db\Adapter\MysqlAdapter;
//...
$table = $this->table('cart_items');
$table->addColumn('user_id', 'integer')
->addColumn('product_id', 'integer', ['limit' => MysqlAdapter::INT_BIG])
->addColumn('subtype_id', 'integer', ['limit' => MysqlAdapter::INT_SMALL])
->addColumn('quantity', 'integer', ['limit' => MysqlAdapter::INT_TINY])
->create();
Custom Column Types & Default Values
Some DBMS systems provide additional column types and default values that are specific to them.
If you don’t want to keep your migrations DBMS-agnostic you can use those custom types in your migrations
through the \Phinx\Util\Literal::from
method, which takes a string as its only argument, and returns an
instance of \Phinx\Util\Literal
. When Phinx encounters this value as a column’s type it knows not to
run any validation on it and to use it exactly as supplied without escaping. This also works for default
values.
You can see an example below showing how to add a citext
column as well as a column whose default value
is a function, in PostgreSQL. This method of preventing the built-in escaping is supported in all adapters.
<?php
use Phinx\Migration\AbstractMigration;
use Phinx\Util\Literal;
class AddSomeColumns extends AbstractMigration
{
public function change()
{
$this->table('users')
->addColumn('username', Literal::from('citext'))
->addColumn('uniqid', 'uuid', [
'default' => Literal::from('uuid_generate_v4()')
])
->addColumn('creation', 'timestamp', [
'timezone' => true,
'default' => Literal::from('now()')
])
->create();
}
}
User Defined Types (Custom Data Domain)
Building upon the base types and column options you can define your custom
user defined types. Custom user defined types are configured in the
data_domain
root config option.
data_domain:
phone_number:
type: string
length: 20
address_line:
type: string
length: 150
Each user defined type can hold any valid type and column option, they are just
used as “macros” and replaced at the time of migration.
<?php
//...
$table = $this->table('user_data');
$table->addColumn('user_phone_number', 'phone_number')
->addColumn('user_address_line_1', 'address_line')
->addColumn('user_address_line_2', 'address_line', ['null' => true])
->create();
Specifying a data domain at the beginning of your project is crucial to have a
homogeneous data model. It avoids mistakes like having many contact_name
columns with different lengths, mismatched integer types (long vs. bigint, etc).
Note
For integer
, text
and blob
columns you can use the special
constants from MySQL and Postgress adapter classes.
You can even customize some internal types to add your own default options,
but some column options can’t be overriden in the data model (some options
are fixed like limit
for the uuid
special data type).
# Some examples of custom data types
data_domain:
file:
type: blob
limit: BLOB_LONG # For MySQL DB. Uses MysqlAdapter::BLOB_LONG
boolean:
type: boolean # Customization of the boolean to be unsigned
signed: false
image_type:
type: enum # Enums can use YAML lists or a comma separated string
values:
- gif
- jpg
- png
Get a column list
To retrieve all table columns, simply create a table object and call getColumns()
method. This method will return an array of Column classes with basic info. Example below:
<?php
use Phinx\Migration\AbstractMigration;
class ColumnListMigration extends AbstractMigration
{
/**
* Migrate Up.
*/
public function up()
{
$columns = $this->table('users')->getColumns();
...
}
/**
* Migrate Down.
*/
public function down()
{
...
}
}
Get a column by name
To retrieve one table column, simply create a table object and call the getColumn()
method. This method will return a Column class with basic info or NULL when the column doesn’t exist. Example below:
<?php
use Phinx\Migration\AbstractMigration;
class ColumnListMigration extends AbstractMigration
{
/**
* Migrate Up.
*/
public function up()
{
$column = $this->table('users')->getColumn('email');
...
}
/**
* Migrate Down.
*/
public function down()
{
...
}
}
Checking whether a column exists
You can check if a table already has a certain column by using the
hasColumn()
method.
<?php
use Phinx\Migration\AbstractMigration;
class MyNewMigration extends AbstractMigration
{
/**
* Change Method.
*/
public function change()
{
$table = $this->table('user');
$column = $table->hasColumn('username');
if ($column) {
// do something
}
}
}
Renaming a Column
To rename a column, access an instance of the Table object then call the
renameColumn()
method.
<?php
use Phinx\Migration\AbstractMigration;
class MyNewMigration extends AbstractMigration
{
/**
* Migrate Up.
*/
public function up()
{
$table = $this->table('users');
$table->renameColumn('bio', 'biography')
->save();
}
/**
* Migrate Down.
*/
public function down()
{
$table = $this->table('users');
$table->renameColumn('biography', 'bio')
->save();
}
}
Adding a Column After Another Column
When adding a column with the MySQL adapter, you can dictate its position using the after
option,
where its value is the name of the column to position it after.
<?php
use Phinx\Migration\AbstractMigration;
class MyNewMigration extends AbstractMigration
{
/**
* Change Method.
*/
public function change()
{
$table = $this->table('users');
$table->addColumn('city', 'string', ['after' => 'email'])
->update();
}
}
This would create the new column city
and position it after the email
column. The
\Phinx\Db\Adapter\MysqlAdapter::FIRST
constant can be used to specify that the new column should be
created as the first column in that table.
Dropping a Column
To drop a column, use the removeColumn()
method.
<?php
use Phinx\Migration\AbstractMigration;
class MyNewMigration extends AbstractMigration
{
/**
* Migrate up.
*/
public function up()
{
$table = $this->table('users');
$table->removeColumn('short_name')
->save();
}
}
Specifying a Column Limit
You can limit the maximum length of a column by using the limit
option.
<?php
use Phinx\Migration\AbstractMigration;
class MyNewMigration extends AbstractMigration
{
/**
* Change Method.
*/
public function change()
{
$table = $this->table('tags');
$table->addColumn('short_name', 'string', ['limit' => 30])
->update();
}
}
Changing Column Attributes
To change column type or options on an existing column, use the changeColumn()
method.
See Valid Column Types and Valid Column Options for allowed values.
<?php
use Phinx\Migration\AbstractMigration;
class MyNewMigration extends AbstractMigration
{
/**
* Migrate Up.
*/
public function up()
{
$users = $this->table('users');
$users->changeColumn('email', 'string', ['limit' => 255])
->save();
}
/**
* Migrate Down.
*/
public function down()
{
}
}
Working With Indexes
To add an index to a table you can simply call the addIndex()
method on the
table object.
<?php
use Phinx\Migration\AbstractMigration;
class MyNewMigration extends AbstractMigration
{
/**
* Migrate Up.
*/
public function up()
{
$table = $this->table('users');
$table->addColumn('city', 'string')
->addIndex(['city'])
->save();
}
/**
* Migrate Down.
*/
public function down()
{
}
}
By default Phinx instructs the database adapter to create a normal index. We
can pass an additional parameter unique
to the addIndex()
method to
specify a unique index. We can also explicitly specify a name for the index
using the name
parameter, the index columns sort order can also be specified using
the order
parameter. The order parameter takes an array of column names and sort order key/value pairs.
<?php
use Phinx\Migration\AbstractMigration;
class MyNewMigration extends AbstractMigration
{
/**
* Migrate Up.
*/
public function up()
{
$table = $this->table('users');
$table->addColumn('email', 'string')
->addColumn('username','string')
->addIndex(['email', 'username'], [
'unique' => true,
'name' => 'idx_users_email',
'order' => ['email' => 'DESC', 'username' => 'ASC']]
)
->save();
}
/**
* Migrate Down.
*/
public function down()
{
}
}
The MySQL adapter also supports fulltext
indexes. If you are using a version before 5.6 you must
ensure the table uses the MyISAM
engine.
<?php
use Phinx\Migration\AbstractMigration;
class MyNewMigration extends AbstractMigration
{
public function change()
{
$table = $this->table('users', ['engine' => 'MyISAM']);
$table->addColumn('email', 'string')
->addIndex('email', ['type' => 'fulltext'])
->create();
}
}
In addition, MySQL adapter also supports setting the index length defined by limit option.
When you are using a multi-column index, you are able to define each column index length.
The single column index can define its index length with or without defining column name in limit option.
<?php
use Phinx\Migration\AbstractMigration;
class MyNewMigration extends AbstractMigration
{
public function change()
{
$table = $this->table('users');
$table->addColumn('email', 'string')
->addColumn('username','string')
->addColumn('user_guid', 'string', ['limit' => 36])
->addIndex(['email','username'], ['limit' => ['email' => 5, 'username' => 2]])
->addIndex('user_guid', ['limit' => 6])
->create();
}
}
The SQL Server and PostgreSQL adapters also supports include
(non-key) columns on indexes.
<?php
use Phinx\Migration\AbstractMigration;
class MyNewMigration extends AbstractMigration
{
public function change()
{
$table = $this->table('users');
$table->addColumn('email', 'string')
->addColumn('firstname','string')
->addColumn('lastname','string')
->addIndex(['email'], ['include' => ['firstname', 'lastname']])
->create();
}
}
In addition PostgreSQL adapters also supports Generalized Inverted Index gin
indexes.
<?php
use Phinx\Migration\AbstractMigration;
class MyNewMigration extends AbstractMigration
{
public function change()
{
$table = $this->table('users');
$table->addColumn('address', 'string')
->addIndex('address', ['type' => 'gin'])
->create();
}
}
Removing indexes is as easy as calling the removeIndex()
method. You must
call this method for each index.
<?php
use Phinx\Migration\AbstractMigration;
class MyNewMigration extends AbstractMigration
{
/**
* Migrate Up.
*/
public function up()
{
$table = $this->table('users');
$table->removeIndex(['email'])
->save();
// alternatively, you can delete an index by its name, ie:
$table->removeIndexByName('idx_users_email')
->save();
}
/**
* Migrate Down.
*/
public function down()
{
}
}
Working With Foreign Keys
Phinx has support for creating foreign key constraints on your database tables.
Let’s add a foreign key to an example table:
<?php
use Phinx\Migration\AbstractMigration;
class MyNewMigration extends AbstractMigration
{
/**
* Migrate Up.
*/
public function up()
{
$table = $this->table('tags');
$table->addColumn('tag_name', 'string')
->save();
$refTable = $this->table('tag_relationships');
$refTable->addColumn('tag_id', 'integer', ['null' => true])
->addForeignKey('tag_id', 'tags', 'id', ['delete'=> 'SET_NULL', 'update'=> 'NO_ACTION'])
->save();
}
/**
* Migrate Down.
*/
public function down()
{
}
}
“On delete” and “On update” actions are defined with a ‘delete’ and ‘update’ options array. Possibles values are ‘SET_NULL’, ‘NO_ACTION’, ‘CASCADE’ and ‘RESTRICT’. If ‘SET_NULL’ is used then the column must be created as nullable with the option ['null' => true]
.
Constraint name can be changed with the ‘constraint’ option.
It is also possible to pass addForeignKey()
an array of columns.
This allows us to establish a foreign key relationship to a table which uses a combined key.
<?php
use Phinx\Migration\AbstractMigration;
class MyNewMigration extends AbstractMigration
{
/**
* Migrate Up.
*/
public function up()
{
$table = $this->table('follower_events');
$table->addColumn('user_id', 'integer')
->addColumn('follower_id', 'integer')
->addColumn('event_id', 'integer')
->addForeignKey(['user_id', 'follower_id'],
'followers',
['user_id', 'follower_id'],
['delete'=> 'NO_ACTION', 'update'=> 'NO_ACTION', 'constraint' => 'user_follower_id'])
->save();
}
/**
* Migrate Down.
*/
public function down()
{
}
}
We can add named foreign keys using the constraint
parameter. This feature is supported as of Phinx version 0.6.5
<?php
use Phinx\Migration\AbstractMigration;
class MyNewMigration extends AbstractMigration
{
/**
* Migrate Up.
*/
public function up()
{
$table = $this->table('your_table');
$table->addForeignKey('foreign_id', 'reference_table', ['id'],
['constraint' => 'your_foreign_key_name']);
->save();
}
/**
* Migrate Down.
*/
public function down()
{
}
}
We can also easily check if a foreign key exists:
<?php
use Phinx\Migration\AbstractMigration;
class MyNewMigration extends AbstractMigration
{
/**
* Migrate Up.
*/
public function up()
{
$table = $this->table('tag_relationships');
$exists = $table->hasForeignKey('tag_id');
if ($exists) {
// do something
}
}
/**
* Migrate Down.
*/
public function down()
{
}
}
Finally, to delete a foreign key, use the dropForeignKey
method.
Note that like other methods in the Table
class, dropForeignKey
also needs save()
to be called at the end in order to be executed. This allows phinx to intelligently
plan migrations when more than one table is involved.
<?php
use Phinx\Migration\AbstractMigration;
class MyNewMigration extends AbstractMigration
{
/**
* Migrate Up.
*/
public function up()
{
$table = $this->table('tag_relationships');
$table->dropForeignKey('tag_id')->save();
}
/**
* Migrate Down.
*/
public function down()
{
}
}
Using the Query Builder
It is not uncommon to pair database structure changes with data changes. For example, you may want to
migrate the data in a couple columns from the users to a newly created table. For this type of scenarios,
Phinx provides access to a Query builder object, that you may use to execute complex SELECT
, UPDATE
,
INSERT
or DELETE
statements.
The Query builder is provided by the cakephp/database project, and should
be easy to work with as it resembles very closely plain SQL. Accesing the query builder is done by calling the
getQueryBuilder(string $type)
function. The string $type
options are ‘select’, ‘insert’, ‘update’ and ‘delete’:
<?php
use Phinx\Migration\AbstractMigration;
class MyNewMigration extends AbstractMigration
{
/**
* Migrate Up.
*/
public function up()
{
$builder = $this->getQueryBuilder('select');
$statement = $builder->select('*')->from('users')->execute();
var_dump($statement->fetchAll());
}
}
Selecting Fields
Adding fields to the SELECT clause:
<?php
$builder->select(['id', 'title', 'body']);
// Results in SELECT id AS pk, title AS aliased_title, body ...
$builder->select(['pk' => 'id', 'aliased_title' => 'title', 'body']);
// Use a closure
$builder->select(function ($builder) {
return ['id', 'title', 'body'];
});
Where Conditions
Generating conditions:
// WHERE id = 1
$builder->where(['id' => 1]);
// WHERE id > 1
$builder->where(['id >' => 1]);
As you can see you can use any operator by placing it with a space after the field name. Adding multiple conditions is easy as well:
<?php
$builder->where(['id >' => 1])->andWhere(['title' => 'My Title']);
// Equivalent to
$builder->where(['id >' => 1, 'title' => 'My title']);
// WHERE id > 1 OR title = 'My title'
$builder->where(['OR' => ['id >' => 1, 'title' => 'My title']]);
For even more complex conditions you can use closures and expression objects:
<?php
// Coditions are tied together with AND by default
$builder
->select('*')
->from('articles')
->where(function ($exp) {
return $exp
->eq('author_id', 2)
->eq('published', true)
->notEq('spam', true)
->gt('view_count', 10);
});
Which results in:
SELECT * FROM articles
WHERE
author_id = 2
AND published = 1
AND spam != 1
AND view_count > 10
Combining expressions is also possible:
<?php
$builder
->select('*')
->from('articles')
->where(function ($exp) {
$orConditions = $exp->or_(['author_id' => 2])
->eq('author_id', 5);
return $exp
->not($orConditions)
->lte('view_count', 10);
});
It generates:
SELECT *
FROM articles
WHERE
NOT (author_id = 2 OR author_id = 5)
AND view_count <= 10
When using the expression objects you can use the following methods to create conditions:
eq()
Creates an equality condition.
notEq()
Create an inequality condition
like()
Create a condition using the LIKE
operator.
notLike()
Create a negated LIKE
condition.
in()
Create a condition using IN
.
notIn()
Create a negated condition using IN
.
gt()
Create a >
condition.
gte()
Create a >=
condition.
lt()
Create a <
condition.
lte()
Create a <=
condition.
isNull()
Create an IS NULL
condition.
isNotNull()
Create a negated IS NULL
condition.
Aggregates and SQL Functions
<?php
// Results in SELECT COUNT(*) count FROM ...
$builder->select(['count' => $builder->func()->count('*')]);
A number of commonly used functions can be created with the func() method:
sum()
Calculate a sum. The arguments will be treated as literal values.
avg()
Calculate an average. The arguments will be treated as literal values.
min()
Calculate the min of a column. The arguments will be treated as literal values.
max()
Calculate the max of a column. The arguments will be treated as literal values.
count()
Calculate the count. The arguments will be treated as literal values.
concat()
Concatenate two values together. The arguments are treated as bound parameters unless marked as literal.
coalesce()
Coalesce values. The arguments are treated as bound parameters unless marked as literal.
dateDiff()
Get the difference between two dates/times. The arguments are treated as bound parameters unless marked as literal.
now()
Take either ‘time’ or ‘date’ as an argument allowing you to get either the current time, or current date.
When providing arguments for SQL functions, there are two kinds of parameters you can use,
literal arguments and bound parameters. Literal parameters allow you to reference columns or
other SQL literals. Bound parameters can be used to safely add user data to SQL functions. For example:
<?php
// Generates:
// SELECT CONCAT(title, ' NEW') ...;
$concat = $builder->func()->concat([
'title' => 'literal',
' NEW'
]);
$query->select(['title' => $concat]);
Getting Results out of a Query
Once you’ve made your query, you’ll want to retrieve rows from it. There are a few ways of doing this:
<?php
// Iterate the query
foreach ($builder as $row) {
echo $row['title'];
}
// Get the statement and fetch all results
$results = $builder->execute()->fetchAll('assoc');
Creating an Insert Query
Creating insert queries is also possible:
<?php
$builder = $this->getQueryBuilder('insert');
$builder
->insert(['first_name', 'last_name'])
->into('users')
->values(['first_name' => 'Steve', 'last_name' => 'Jobs'])
->values(['first_name' => 'Jon', 'last_name' => 'Snow'])
->execute();
For increased performance, you can use another builder object as the values for an insert query:
<?php
$namesQuery = $this->getQueryBuilder('select');
$namesQuery
->select(['fname', 'lname'])
->from('users')
->where(['is_active' => true]);
$builder = $this->getQueryBuilder('insert');
$st = $builder
->insert(['first_name', 'last_name'])
->into('names')
->values($namesQuery)
->execute();
var_dump($st->lastInsertId('names', 'id'));
The above code will generate:
INSERT INTO names (first_name, last_name)
(SELECT fname, lname FROM USERS where is_active = 1)
Creating an update Query
Creating update queries is similar to both inserting and selecting:
<?php
$builder = $this->getQueryBuilder('update');
$builder
->update('users')
->set('fname', 'Snow')
->where(['fname' => 'Jon'])
->execute();
Creating a Delete Query
Finally, delete queries:
<?php
$builder = $this->getQueryBuilder('delete');
$builder
->delete('users')
->where(['accepted_gdpr' => false])
->execute();