text: -- memdb.test
  -- 
  -- execsql {
  --     CREATE TABLE t4(a,b,c,d);
  --     BEGIN;
  --     INSERT INTO t4 VALUES(1,2,3,4);
  --     SELECT * FROM t4;
  -- }
  CREATE TABLE t4(a,b,c,d);
  BEGIN;
  INSERT INTO t4 VALUES(1,2,3,4);
  SELECT * FROM t4;