package deltas import ( "context" "database/sql" "fmt" "github.com/lib/pq" "github.com/matrix-org/gomatrixserverlib/spec" ) // I know what you're thinking: you're wondering "why doesn't this use $1 // and pass variadic parameters to ExecContext?" — the answer is because // PostgreSQL doesn't expect the table name to be specified as a substituted // argument in that way so it results in a syntax error in the query. func UpServerNamesPopulate(ctx context.Context, tx *sql.Tx, serverName spec.ServerName) error { for _, table := range serverNamesTables { q := fmt.Sprintf( "UPDATE %s SET server_name = %s WHERE server_name = '';", pq.QuoteIdentifier(table), pq.QuoteLiteral(string(serverName)), ) if _, err := tx.ExecContext(ctx, q); err != nil { return fmt.Errorf("write server names to %q error: %w", table, err) } } return nil }