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<?php |
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|
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namespace FluentCart\Database\Migrations; |
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|
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class ProductMetaMigrator extends Migrator |
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{ |
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|
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public static string $tableName = 'fct_product_meta'; |
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|
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public static function getSqlSchema(): string |
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{ |
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$indexPrefix = static::getDbPrefix() . 'fct_pm_'; |
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|
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return "`id` BIGINT UNSIGNED NOT NULL PRIMARY KEY AUTO_INCREMENT, |
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`object_id` BIGINT UNSIGNED NOT NULL, |
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`object_type` VARCHAR(192) NULL, |
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`meta_key` VARCHAR(192) NOT NULL, |
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`meta_value` LONGTEXT NULL DEFAULT NULL, |
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`created_at` DATETIME NULL, |
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`updated_at` DATETIME NULL, |
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|
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INDEX `{$indexPrefix}_meta_key` (`meta_key` ASC), |
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INDEX `{$indexPrefix}_object_meta` (`object_id` ASC, `meta_key` ASC),"; |
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} |
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|
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public static function migrated() |
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{ |
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static::dropCompositeUniqueIndex(); |
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static::addObjectMetaIndex(); |
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} |
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|
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public static function addObjectMetaIndex() |
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{ |
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// "ALTER TABLE %i ADD INDEX `{prefix}fct_pm__object_meta` (`object_id`, `meta_key`)" |
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// Every read of this table looks a row up by owner: `object_id = ? AND meta_key = ?` |
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// (variant thumbnails, product licence meta). The only index was on `meta_key`, |
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// which is not selective — one key dominates the table — so those lookups scanned |
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// it. Composite and non-unique on purpose: the unique variant was dropped above |
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// because a single object legitimately holds repeated keys. |
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static::addIndexIfNotExists(static::getDbPrefix() . 'fct_pm__object_meta', ['object_id', 'meta_key']); |
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} |
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|
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public static function dropCompositeUniqueIndex() |
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{ |
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// "ALTER TABLE %i DROP INDEX %i" (index: {prefix}fct_pm__comp_unq) |
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static::dropIndexIfExists(static::getDbPrefix() . 'fct_pm__comp_unq'); |
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} |
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} |
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