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Add utility class for migrating metadata.

This commit is contained in:
vedanshujain 2022-03-24 13:40:55 +05:30
parent cb280829cc
commit c44cc40d21
1 changed files with 121 additions and 0 deletions
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plugins/woocommerce/src/Database/Migrations/CustomOrderTable/MetaToMetaTableMigrator.php Normal file
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<?php
/**
* Generic Migration class to move any meta data associated to an entity, to a different meta table associated with a custom entity table.
*/
namespace Automattic\WooCommerce\DataBase\Migrations\CustomOrderTable;
use MigrationHelper;
class MetaToMetaTableMigrator {
private $schema_config;
/**
* MetaToMetaTableMigrator constructor.
*
* @param array $schema_config This parameters provides general but essential information about tables under migrations. Must be of the form-
* array(
* 'entity_schema' =>
* array (
* 'primary_id' => 'primary_id column name of source table',
* 'table_name' => 'name of the source table'.
* ),
* 'entity_meta_schema' =>
* array (
* 'meta_key_column' => 'name of meta_key column in source meta table',
* 'meta_value_column' => 'name of meta_value column in source meta table',
* 'table_name' => 'name of source meta table',
* ),
* 'destination_table' => 'name of destination custom table',
* 'entity_meta_relation' =>
* array (
* 'entity' => 'name of column in source table which is used in source meta table',
* 'meta' => 'name of column in source meta table which contains key of records in source table',
* )
* )
* ).
* @param array $exclude_columns List of columns to exclude.
*/
public function __construct( $schema_config ) {
$this->schema_config = $schema_config;
}
public function generate_insert_sql_for_batch( $batch, $insert_switch ) {
global $wpdb;
$insert_query = MigrationHelper::get_insert_switch( $insert_switch );
$meta_key_column = MigrationHelper::escape_backtick( $this->schema_config['destination']['meta']['meta_key_column'] );
$meta_value_column = MigrationHelper::escape_backtick( $this->schema_config['destination']['meta']['meta_value_column'] );
$entity_id_column = MigrationHelper::escape_backtick( $this->schema_config['destination']['meta']['entity_id_column'] );
$column_sql = "(`$entity_id_column`, `$meta_key_column`, `$meta_value_column`)";
$table = $this->schema_config['destination']['meta_table_name'];
$entity_id_column_placeholder = MigrationHelper::get_wpdb_placeholder_for_type( $this->schema_config['destination']['meta']['entity_id_type'] );
$placeholder_string = "( $entity_id_column_placeholder, %s, %s )";
$values = array();
foreach ( array_values( $batch ) as $row ) {
$query_params = array(
$row['destination_entity_id'],
$row['meta_key'],
$row['meta_value']
);
$value_sql = $wpdb->prepare( "( $placeholder_string )", $query_params );
$values[] = $value_sql;
}
$values_sql = implode( ',', $values );
return "$insert_query INTO $table $column_sql VALUES $values_sql";
}
public function fetch_data_for_migration( $where_clause ) {
global $wpdb;
$meta_query = $this->build_meta_table_query( $where_clause );
$meta_data_rows = $wpdb->get_results( $meta_query );
if ( empty ( $meta_data_rows ) ) {
return array(
'data' => array(),
'errors' => array(),
);
}
return $meta_data_rows;
}
private function build_meta_table_query( $where_clause ) {
global $wpdb;
$source_meta_key_column = MigrationHelper::escape_backtick( $this->schema_config['source']['meta_key_column'] );
$source_meta_value_column = MigrationHelper::escape_backtick( $this->schema_config['source']['meta_value_column'] );
$source_entity_id_column = MigrationHelper::escape_backtick( $this->schema_config['source']['meta_entity_id_column'] );
$source_meta_table_name = MigrationHelper::escape_backtick( $this->schema_config['source']['meta_table_name'] );
$order_by = "`$source_meta_table_name`.`$source_entity_id_column` ASC";
$destination_entity_table = $this->schema_config['destination']['entity_table_name'];
$destination_entity_id_column = $this->schema_config['destination']['entity_id_column'];
$destination_source_id_mapping_column = $this->schema_config['destination']['source_id_column'];
if ( $this->schema_config['source']['excluded_keys'] ) {
$key_placeholder = implode( ',', array_fill( 0, count( $this->schema_config['source']['excluded_keys'] ), '%s' ) );
$exclude_clause = $wpdb->prepare( "$source_meta_key_column NOT IN ( $key_placeholder )", $this->schema_config['source']['excluded_keys'] );
$where_clause = "$where_clause AND $exclude_clause";
}
$meta_data_sql = "
SELECT
`$source_meta_table_name`.`$source_entity_id_column` as source_entity_id,
`$destination_entity_table`.`$destination_entity_id_column` as destination_entity_id,
`$source_meta_table_name`.`$source_meta_key_column` as meta_key,
`$source_meta_table_name`.`$source_meta_value_column` as meta_value
FROM `$source_meta_table_name`
JOIN `$destination_entity_table` ON `$destination_entity_table`.`$destination_source_id_mapping_column` = `$source_meta_table_name`.`$source_entity_id_column`
WHERE $where_clause ORDER BY $order_by
";
return $meta_data_sql;
}
}