sub create_db {
  unlink 'mydb.sqlite' if -e 'mydb.sqlite';
  my $dbh = DBI->connect("dbi:SQLite:dbname=mydb.sqlite","","");
  $dbh->do('CREATE TABLE plants (genus,common_name,type,chicagoland_grows,id )');
  $dbh->do('CREATE TABLE sizes (show_plant,plant_size,plantid,unit,userid)');
  $dbh->do('CREATE TABLE growers (plantid,plant_size,abbr)');

  my $sql = 'INSERT INTO plants VALUES (?,?,?,?,?)';
  my $sth = $dbh->prepare($sql);
  $sth->execute("Roses","Roses",1,0,1000);
  $sth->execute("Violets","Violets",1,0,1001);

  $sql = 'INSERT INTO sizes VALUES (?,?,?,?,?)';
  $sth = $dbh->prepare($sql);
  my @sizes = (
    [1,2,1000,'"',4],[1,4,1000,'"',4],
    [1,3,1001,'"',4] );
  $sth->execute(@$_) for @sizes;
 
  $sql = 'INSERT INTO growers VALUES (?,?,?)';
  $sth = $dbh->prepare($sql);
  my @growers = (
    [1000,2,'MA'],[1000,2,'CD'],[1000,2,'TH'],
    [1000,4,'CD'],[1000,4,'TH'],[1001,3,'MA'],
    [1001,3,'TH'] );    
  $sth->execute(@$_) for @growers;
  
  return $dbh;
}