'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();
foreach ( $to_migrate as $entity_id => $rows ) {
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 are multiple meta entries, let's find the unique entries and insert.
$unique_meta_values = array_diff( $meta_values, array_column( $already_migrated[ $entity_id ][ $meta_key ], 'meta_value' ) );
if ( 0 === count( $unique_meta_values ) ) {
continue;
}
if ( ! isset( $to_insert[ $entity_id ] ) ) {
$to_insert[ $entity_id ] = array();
}
$to_insert[ $entity_id ][ $meta_key ] = $unique_meta_values;
}
}
}
return array( $to_insert, $to_update );
}
/**
* 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 ( $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
}
}