5.7 索引操作

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2023-12-01

索引操作

使用 addIndex() 方法可以指定索引

<?php

use Phinx\Migration\AbstractMigration;

class MyNewMigration extends AbstractMigration
{
    /**
     * Migrate Up.
     */
    public function up()
    {
        $table = $this->table('users');
        $table->addColumn('city', 'string')
              ->addIndex(array('city'))
              ->save();
    }

    /**
     * Migrate Down.
     */
    public function down()
    {

    }
}

Phinx 默认创建的是普通索引，我们可以通过添加 unique 参数来指定唯一值。也可以使用 name 参数来制定索引名。

<?php

use Phinx\Migration\AbstractMigration;

class MyNewMigration extends AbstractMigration
{
    /**
     * Migrate Up.
     */
    public function up()
    {
        $table = $this->table('users');
        $table->addColumn('email', 'string')
              ->addIndex(array('email'), array('unique' => true, 'name' => 'idx_users_email'))
              ->save();
    }

    /**
     * Migrate Down.
     */
    public function down()
    {

    }
}

MySQL adapter 支持 fulltext 索引。如果你使用版本低于 5.6 则必须确保数据表是 MyISAM引擎

<?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();
    }
}

调用 removeIndex() 方法可以删除索引。必须一条条删除

<?php

use Phinx\Migration\AbstractMigration;

class MyNewMigration extends AbstractMigration
{
    /**
     * Migrate Up.
     */
    public function up()
    {
        $table = $this->table('users');
        $table->removeIndex(array('email'));

        // alternatively, you can delete an index by its name, ie:
        $table->removeIndexByName('idx_users_email');
    }

    /**
     * Migrate Down.
     */
    public function down()
    {

    }
}

当调用 removeIndex() 方法时不需要调用 save() 方法。索引会立即删除