<?php if ( ! defined( 'ABSPATH' ) ) exit;

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class NF_Database_Migrations_FieldMeta extends NF_Abstracts_Migration

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{

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/**

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* Constructor method for the NF_Database_Migrations_FieldMeta class.

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*

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* @since 3.0.0

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*/

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public function __construct()

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{

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parent::__construct(

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'nf3_field_meta',

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'nf_migration_create_table_field_meta'

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);

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}

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/**

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* Function to run our initial migration.

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*

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* @since 3.0.0

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*

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* @updated 3.4.0

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*/

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public function run()

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{

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$query = "CREATE TABLE IF NOT EXISTS {$this->table_name()} (

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`id` int NOT NULL AUTO_INCREMENT,

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`parent_id` int NOT NULL,

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`key` longtext NOT NULL,

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`value` longtext,

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`meta_key` longtext,

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`meta_value` longtext,

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UNIQUE KEY (`id`)

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) {$this->charset_collate( true )};";

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dbDelta( $query );

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}

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/**

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* Function to run our stage three upgrades.

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*

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* @since 3.3.12

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*

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* @updated 3.4.0

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*/

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public function cache_collate_fields()

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{

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// If the meta_key column has not already been defined...

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if ( ! $this->column_exists( 'meta_key' ) ) {

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global $wpdb;

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// Modify our table.

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$query = "ALTER TABLE {$this->table_name()}

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ADD `meta_key` longtext {$this->charset_collate()},

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ADD `meta_value` longtext {$this->charset_collate()}";

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$wpdb->query( $query );

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}

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}

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}

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