Here's something i've been using for quite a while:
sub make_select_query {
my ($table, $select_fields, $conditions) = @_;
my $query = "SELECT ";
if ( defined $select_fields ) {
if ( ref($select_array) eq "ARRAY" ) {
$query .= join ",", @$select_array;
}
else {
$query .= $select_fields;
}
}
else {
$query .= "\*";
}
$query .= " FROM " . $table;
# only put the where and conditions in the query string
# if conditions are present
if (keys %$conditions) {
$query .= " WHERE ";
foreach my $key (keys %$conditions) {
push @conds, $key . "=\'" . $conditions->{$key} . "\'";
}
}
$query .= join " and ", @conds;
return $query;
}
Of course this has a number of shortcomings, such as:
All conditions use equality. This could be worked around by having a condition hash like this instead:
...
$condtions = {
"age" => " >= 21 ",
"sex" => " = female ",
};
But this is leading down the path that the more complicated your need, the less likely there will be a general solution that does exactly what you need.