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array( * 'meta' => array( * 'table_name' => source_meta_table_name, * 'entity_id_column' => entity_id column name in source meta table, * 'meta_key_column' => meta_key column', * 'meta_value_column' => meta_value column', * ), * 'entity' => array( * 'table_name' => entity table name for the meta table, * 'source_id_column' => column name in entity table which maps to meta table, * 'id_column' => id column in entity table, * ), * 'excluded_keys' => array of keys to exclude, * ), * 'destination' => array( * 'meta' => array( * 'table_name' => destination meta table name, * 'entity_id_column' => entity_id column in meta table, * 'meta_key_column' => meta key column, * 'meta_value_column' => meta_value column, * 'entity_id_type' => data type of entity id, * 'meta_id_column' => id column in meta table, * ), * ), * ) */ abstract protected function get_meta_config(): array; /** * MetaToMetaTableMigrator constructor. */ public function __construct() { $this->schema_config = $this->get_meta_config(); } /** * Return data to be migrated for a batch of entities. * * @param array $entity_ids Ids of entities to migrate. * * @return array[] Data to be migrated. Would be of the form: array( 'data' => array( ... ), 'errors' => array( ... ) ). */ public function fetch_sanitized_migration_data( $entity_ids ) { $this->clear_errors(); $to_migrate = $this->fetch_data_for_migration_for_ids( $entity_ids ); if ( empty( $to_migrate ) ) { return array( 'data' => array(), 'errors' => array(), ); } $already_migrated = $this->get_already_migrated_records( array_keys( $to_migrate ) ); return array( 'data' => $this->classify_update_insert_records( $to_migrate, $already_migrated ), 'errors' => $this->get_errors(), ); } /** * Migrate a batch of entities from the posts table to the corresponding table. * * @param array $entity_ids Ids of entities ro migrate. */ protected function process_migration_batch_for_ids_core( array $entity_ids ): void { $sanitized_data = $this->fetch_sanitized_migration_data( $entity_ids ); $this->process_migration_data( $sanitized_data ); } /** * Process migration data for a batch of entities. * * @param array $data Data to be migrated. Should be of the form: array( 'data' => array( ... ) ) as returned by the `fetch_sanitized_migration_data` method. * * @return array Array of errors and exception if any. */ public function process_migration_data( array $data ) { if ( isset( $data['data'] ) ) { $data = $data['data']; } $this->clear_errors(); $exception = null; $to_insert = $data[0]; $to_update = $data[1]; $to_delete = $data[2] ?? array(); try { if ( ! empty( $to_delete ) ) { $delete_queries = $this->generate_delete_sql_for_batch( $to_delete ); if ( $delete_queries ) { $processed_rows_count = $this->db_query( $delete_queries ); $this->maybe_add_insert_or_update_error( 'delete', $processed_rows_count ); } } if ( ! empty( $to_insert ) ) { $insert_queries = $this->generate_insert_sql_for_batch( $to_insert ); $processed_rows_count = $this->db_query( $insert_queries ); $this->maybe_add_insert_or_update_error( 'insert', $processed_rows_count ); } if ( ! empty( $to_update ) ) { $update_queries = $this->generate_update_sql_for_batch( $to_update ); $processed_rows_count = $this->db_query( $update_queries ); $this->maybe_add_insert_or_update_error( 'update', $processed_rows_count ); } } catch ( \Exception $e ) { $exception = $e; } return array( 'errors' => $this->get_errors(), 'exception' => $exception, ); } /** * Generate delete SQL for given batch. * * @since 10.4.0 * * @param array $batch List of data to generate delete SQL for. Should be in same format as output of $this->fetch_data_for_migration_for_ids. * @return string */ private function generate_delete_sql_for_batch( array $batch ): string { global $wpdb; $table = $this->schema_config['destination']['meta']['table_name']; $meta_id_column = $this->schema_config['destination']['meta']['meta_id_column']; $entity_id_column = $this->schema_config['destination']['meta']['entity_id_column']; $entity_id_placeholder = MigrationHelper::get_wpdb_placeholder_for_type( $this->schema_config['destination']['meta']['entity_id_type'] ); $clauses = array(); foreach ( $batch as $entity_id => $metas ) { $meta_ids = array_column( array_reduce( $metas, 'array_merge', array() ), $meta_id_column ); if ( ! $meta_ids ) { continue; } $meta_id_placeholders = implode( ',', array_fill( 0, count( $meta_ids ), '%d' ) ); // phpcs:disable WordPress.DB.PreparedSQL.InterpolatedNotPrepared,WordPress.DB.PreparedSQLPlaceholders.ReplacementsWrongNumber $clauses[] = $wpdb->prepare( "( %i = {$entity_id_placeholder} AND %i IN ({$meta_id_placeholders}) )", $entity_id_column, $entity_id, $meta_id_column, ...$meta_ids ); // phpcs:enable } if ( ! $clauses ) { return ''; } $clauses_sql = implode( ' OR ', $clauses ); return "DELETE FROM {$table} WHERE {$clauses_sql}"; } /** * Generate update SQL for given batch. * * @param array $batch List of data to generate update SQL for. Should be in same format as output of $this->fetch_data_for_migration_for_ids. * * @return string Query to update batch records. */ private function generate_update_sql_for_batch( array $batch ): string { global $wpdb; $table = $this->schema_config['destination']['meta']['table_name']; $meta_id_column = $this->schema_config['destination']['meta']['meta_id_column']; $meta_key_column = $this->schema_config['destination']['meta']['meta_key_column']; $meta_value_column = $this->schema_config['destination']['meta']['meta_value_column']; $entity_id_column = $this->schema_config['destination']['meta']['entity_id_column']; $columns = array( $meta_id_column, $entity_id_column, $meta_key_column, $meta_value_column ); $columns_sql = implode( '`, `', $columns ); $entity_id_column_placeholder = MigrationHelper::get_wpdb_placeholder_for_type( $this->schema_config['destination']['meta']['entity_id_type'] ); $placeholder_string = "%d, $entity_id_column_placeholder, %s, %s"; $values = array(); foreach ( $batch as $entity_id => $rows ) { foreach ( $rows as $meta_key => $meta_details ) { // phpcs:disable WordPress.DB.PreparedSQL, WordPress.DB.PreparedSQLPlaceholders $values[] = $wpdb->prepare( "( $placeholder_string )", array( $meta_details['id'], $entity_id, $meta_key, $meta_details['meta_value'] ) ); // phpcs:enable } } $value_sql = implode( ',', $values ); $on_duplicate_key_clause = MigrationHelper::generate_on_duplicate_statement_clause( $columns ); return "INSERT INTO $table ( `$columns_sql` ) VALUES $value_sql $on_duplicate_key_clause"; } /** * Generate insert sql queries for batches. * * @param array $batch Data to generate queries for. * * @return string Insert SQL query. */ private function generate_insert_sql_for_batch( array $batch ): string { global $wpdb; $table = $this->schema_config['destination']['meta']['table_name']; $meta_key_column = $this->schema_config['destination']['meta']['meta_key_column']; $meta_value_column = $this->schema_config['destination']['meta']['meta_value_column']; $entity_id_column = $this->schema_config['destination']['meta']['entity_id_column']; $column_sql = "(`$entity_id_column`, `$meta_key_column`, `$meta_value_column`)"; $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 ( $batch as $entity_id => $rows ) { foreach ( $rows as $meta_key => $meta_values ) { foreach ( $meta_values as $meta_value ) { $query_params = array( $entity_id, $meta_key, $meta_value, ); // phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared, WordPress.DB.PreparedSQLPlaceholders $value_sql = $wpdb->prepare( "$placeholder_string", $query_params ); $values[] = $value_sql; } } } $values_sql = implode( '), (', $values ); return "INSERT IGNORE INTO $table $column_sql VALUES ($values_sql)"; } /** * Fetch data for migration. * * @param array $entity_ids Array of IDs to fetch data for. * * @return array[] Data, will of the form: * array( * 'id_1' => array( 'column1' => array( value1_1, value1_2...), 'column2' => array(value2_1, value2_2...), ...), * ..., * ) */ public function fetch_data_for_migration_for_ids( array $entity_ids ): array { if ( empty( $entity_ids ) ) { return array(); } $meta_query = $this->build_meta_table_query( $entity_ids ); $meta_data_rows = $this->db_get_results( $meta_query ); if ( ! is_array( $meta_data_rows ) || empty( $meta_data_rows ) ) { return array(); } foreach ( $meta_data_rows as $migrate_row ) { if ( ! isset( $to_migrate[ $migrate_row->entity_id ] ) ) { $to_migrate[ $migrate_row->entity_id ] = array(); } if ( ! isset( $to_migrate[ $migrate_row->entity_id ][ $migrate_row->meta_key ] ) ) { // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_key $to_migrate[ $migrate_row->entity_id ][ $migrate_row->meta_key ] = array(); } $to_migrate[ $migrate_row->entity_id ][ $migrate_row->meta_key ][] = $migrate_row->meta_value; } return $to_migrate; } /** * Helper method to get already migrated records. Will be used to find prevent migration of already migrated records. * * @param array $entity_ids List of entity ids to check for. * * @return array Already migrated records. */ private function get_already_migrated_records( array $entity_ids ): array { global $wpdb; $destination_table_name = $this->schema_config['destination']['meta']['table_name']; $destination_id_column = $this->schema_config['destination']['meta']['meta_id_column']; $destination_entity_id_column = $this->schema_config['destination']['meta']['entity_id_column']; $destination_meta_key_column = $this->schema_config['destination']['meta']['meta_key_column']; $destination_meta_value_column = $this->schema_config['destination']['meta']['meta_value_column']; $entity_id_type_placeholder = MigrationHelper::get_wpdb_placeholder_for_type( $this->schema_config['destination']['meta']['entity_id_type'] ); $entity_ids_placeholder = implode( ',', array_fill( 0, count( $entity_ids ), $entity_id_type_placeholder ) ); // phpcs:disable WordPress.DB.PreparedSQL.InterpolatedNotPrepared, WordPress.DB.PreparedSQLPlaceholders.UnfinishedPrepare $data_already_migrated = $this->db_get_results( $wpdb->prepare( " SELECT $destination_id_column meta_id, $destination_entity_id_column entity_id, $destination_meta_key_column meta_key, $destination_meta_value_column meta_value FROM $destination_table_name destination WHERE destination.$destination_entity_id_column in ( $entity_ids_placeholder ) ORDER BY destination.$destination_entity_id_column ", $entity_ids ) ); // phpcs:enable $already_migrated = array(); foreach ( $data_already_migrated as $migrate_row ) { if ( ! isset( $already_migrated[ $migrate_row->entity_id ] ) ) { $already_migrated[ $migrate_row->entity_id ] = array(); } // phpcs:disable WordPress.DB.SlowDBQuery.slow_db_query_meta_key, WordPress.DB.SlowDBQuery.slow_db_query_meta_value if ( ! isset( $already_migrated[ $migrate_row->entity_id ][ $migrate_row->meta_key ] ) ) { $already_migrated[ $migrate_row->entity_id ][ $migrate_row->meta_key ] = array(); } $already_migrated[ $migrate_row->entity_id ][ $migrate_row->meta_key ][] = array( 'id' => $migrate_row->meta_id, 'meta_value' => $migrate_row->meta_value, ); // phpcs:enable } return $already_migrated; } /** * Classify each record on whether to migrate or update. * * @param array $to_migrate Records to migrate. * @param array $already_migrated Records already migrated. * * @return array[] Returns two arrays, first for records to migrate, and second for records to upgrade. */ private function classify_update_insert_records( array $to_migrate, array $already_migrated ): array { $to_update = array(); $to_insert = array(); $to_delete = array(); foreach ( $to_migrate as $entity_id => $rows ) { // Meta keys we need to fully delete because they don't exist in the source data. $no_longer_exist = array_diff_key( $already_migrated[ $entity_id ] ?? array(), $rows ); if ( $no_longer_exist ) { $to_delete[ $entity_id ] = array_merge( $to_delete[ $entity_id ] ?? array(), $no_longer_exist ); } foreach ( $rows as $meta_key => $meta_values ) { // If there is no corresponding record in the destination table then insert. // If there is single value in both already migrated and current then update. // If there are multiple values in either already_migrated records or in to_migrate_records, then insert instead of updating. if ( ! isset( $already_migrated[ $entity_id ][ $meta_key ] ) ) { if ( ! isset( $to_insert[ $entity_id ] ) ) { $to_insert[ $entity_id ] = array(); } $to_insert[ $entity_id ][ $meta_key ] = $meta_values; } else { if ( 1 === count( $meta_values ) && 1 === count( $already_migrated[ $entity_id ][ $meta_key ] ) ) { if ( $meta_values[0] === $already_migrated[ $entity_id ][ $meta_key ][0]['meta_value'] ) { continue; } if ( ! isset( $to_update[ $entity_id ] ) ) { $to_update[ $entity_id ] = array(); } $to_update[ $entity_id ][ $meta_key ] = array( 'id' => $already_migrated[ $entity_id ][ $meta_key ][0]['id'], // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_value 'meta_value' => $meta_values[0], ); continue; } // There might be multiple entries with the same value, or destination entries that no longer exist in the source data. // It is easier to delete all existing entries with this meta key and insert fresh new ones to honor multiplicity, etc. $to_delete[ $entity_id ][ $meta_key ] = $already_migrated[ $entity_id ][ $meta_key ]; if ( ! isset( $to_insert[ $entity_id ] ) ) { $to_insert[ $entity_id ] = array(); } $to_insert[ $entity_id ][ $meta_key ] = $meta_values; } } } return array( $to_insert, $to_update, $to_delete ); } /** * Helper method to build query used to fetch data from source meta table. * * @param array $entity_ids List of entity IDs to build meta query for. * * @return string Query that can be used to fetch data. */ private function build_meta_table_query( array $entity_ids ): string { global $wpdb; $source_meta_table = $this->schema_config['source']['meta']['table_name']; $source_meta_key_column = $this->schema_config['source']['meta']['meta_key_column']; $source_meta_value_column = $this->schema_config['source']['meta']['meta_value_column']; $source_entity_id_column = $this->schema_config['source']['meta']['entity_id_column']; $order_by = "source.$source_entity_id_column ASC"; $where_clause = "source.`$source_entity_id_column` IN (" . implode( ', ', array_fill( 0, count( $entity_ids ), '%d' ) ) . ')'; $entity_table = $this->schema_config['source']['entity']['table_name']; $entity_id_column = $this->schema_config['source']['entity']['id_column']; $entity_meta_id_mapping_column = $this->schema_config['source']['entity']['source_id_column']; if ( isset( $this->schema_config['source']['excluded_keys'] ) && is_array( $this->schema_config['source']['excluded_keys'] ) ) { $key_placeholder = implode( ',', array_fill( 0, count( $this->schema_config['source']['excluded_keys'] ), '%s' ) ); // phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared, WordPress.DB.PreparedSQLPlaceholders.UnfinishedPrepare -- $source_meta_key_column is escaped for backticks, $key_placeholder is hardcoded. $exclude_clause = $wpdb->prepare( "source.$source_meta_key_column NOT IN ( $key_placeholder )", $this->schema_config['source']['excluded_keys'] ); $where_clause = "$where_clause AND $exclude_clause"; } // phpcs:disable WordPress.DB.PreparedSQL.InterpolatedNotPrepared, WordPress.DB.PreparedSQLPlaceholders.UnfinishedPrepare return $wpdb->prepare( " SELECT source.`$source_entity_id_column` as source_entity_id, entity.`$entity_id_column` as entity_id, source.`$source_meta_key_column` as meta_key, source.`$source_meta_value_column` as meta_value FROM `$source_meta_table` source JOIN `$entity_table` entity ON entity.`$entity_meta_id_mapping_column` = source.`$source_entity_id_column` WHERE $where_clause ORDER BY $order_by ", $entity_ids ); // phpcs:enable } }