Okay, I am working on a function that inserts a row into a MySQL table. Now, I am trying to make this thing slightly intelligent. So I have a hash that looks like the following:

my %TABLES = (      # Hash identifying one database
  'users' => [      # Hash keys are the database's tables
    'username',
    'password',     # Columns of the table in an array
    'first_name',
    'email_address',
    'rating'
  ]
);

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Next I have a subroutine in my module that is called like the following:

$handle->insert (
  -table        =>  "users",
  -primary_key  =>  "username",
  -values       =>  { 
    username      =>  "mt2k",
    first_name    =>  "Nathan",
    email_address =>  'email@example.net',
    password      =>  crypt("password", $salt),
    rating        =>  10
  }
);

[download]

Next comes the part I am having problems with. Here is a sample part that is close to that of my subroutine:

sub insert {
  my ($self, %q) = @_;

  # Set up placeholders
  my $ph = join ', ', ('?') x values %{$q{'-values'}};

  # Prepare the query for the database
  my $sth = $self->{DB}->prepare(
    "INSERT INTO $q{'-table'} VALUES($ph)"
  );

  # This is the line that causes problems. Read below for more.
  $sth->execute(values %{$q{'-values'}});

[download]

If you didn't catch on immediately, the problem lies in the fact that I am supplying the values of the hash to execute(). This means they are not in the correct order that MySQL requires them to be in. This is where the %TABLES hash comes in. This hash contains the arrays that hold the correct order in which the values must be passed as placeholders in the execute() statement.

So what I need to do is take the values of %{$q{'-values'}} and return them sorted in the correct order as identified by %TABLES.

I hope I've been clear enough in order to recieve some answers to this question which has perplexed me. Thanks in advance!

In reply to Sorting hash values according to order of an array by mt2k

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