From: Nigel Metheringham Date: Mon, 11 May 2009 13:38:52 +0000 (+0000) Subject: Added -bool/-not_bool operators - required some refactoring X-Git-Tag: v1.70~150^2~6 X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=commitdiff_plain;h=97a920ef62ad5bf8177531935a67e4ce4d02f260;p=dbsrgits%2FSQL-Abstract.git Added -bool/-not_bool operators - required some refactoring --- diff --git a/lib/SQL/Abstract.pm b/lib/SQL/Abstract.pm index ed4bb33..c6b2e24 100644 --- a/lib/SQL/Abstract.pm +++ b/lib/SQL/Abstract.pm @@ -29,6 +29,15 @@ my @BUILTIN_SPECIAL_OPS = ( {regex => qr/^(not )?in$/i, handler => '_where_field_IN'}, ); +# unaryish operators - key maps to handler +my $BUILTIN_UNARY_OPS = { + 'AND' => '_where_op_ANDOR', + 'OR' => '_where_op_ANDOR', + 'NEST' => '_where_op_NEST', + 'BOOL' => '_where_op_BOOL', + 'NOT_BOOL' => '_where_op_BOOL', +}; + #====================================================================== # DEBUGGING AND ERROR REPORTING #====================================================================== @@ -443,8 +452,8 @@ sub _where_HASHREF { sub _where_op_in_hash { my ($self, $op_str, $v) = @_; - $op_str =~ /^ (AND|OR|NEST) ( \_? \d* ) $/xi - or puke "unknown operator: -$op_str"; + $op_str =~ /^ ([A-Z_]+[A-Z]) ( \_? \d* ) $/xi + or puke "unknown or malstructured operator: -$op_str"; my $op = uc($1); # uppercase, remove trailing digits if ($2) { @@ -454,36 +463,75 @@ sub _where_op_in_hash { $self->_debug("OP(-$op) within hashref, recursing..."); + my $handler = $BUILTIN_UNARY_OPS->{$op}; + if (! $handler) { + puke "unknown operator: -$op_str"; + } + elsif (not ref $handler) { + return $self->$handler ($op, $v); + } + elsif (ref $handler eq 'CODE') { + return $handler->($self, $op, $v); + } + else { + puke "Illegal handler for operator $op - expecting a method name or a coderef"; + } +} + +sub _where_op_ANDOR { + my ($self, $op, $v) = @_; + + $self->_SWITCH_refkind($v, { + ARRAYREF => sub { + return $self->_where_ARRAYREF($v, $op); + }, + + HASHREF => sub { + return ( $op eq 'OR' ) + ? $self->_where_ARRAYREF( [ map { $_ => $v->{$_} } ( sort keys %$v ) ], $op ) + : $self->_where_HASHREF($v); + }, + + SCALARREF => sub { + puke "-$op => \\\$scalar not supported, use -nest => ..."; + }, + + ARRAYREFREF => sub { + puke "-$op => \\[..] not supported, use -nest => ..."; + }, + + SCALAR => sub { # permissively interpreted as SQL + puke "-$op => 'scalar' not supported, use -nest => \\'scalar'"; + }, + + UNDEF => sub { + puke "-$op => undef not supported"; + }, + }); +} + +sub _where_op_NEST { + my ($self, $op, $v) = @_; + $self->_SWITCH_refkind($v, { ARRAYREF => sub { - return $self->_where_ARRAYREF($v, $op eq 'NEST' ? '' : $op); + return $self->_where_ARRAYREF($v, ''); }, HASHREF => sub { - if ($op eq 'OR') { - return $self->_where_ARRAYREF([ map { $_ => $v->{$_} } (sort keys %$v) ], 'OR'); - } - else { # NEST | AND - return $self->_where_HASHREF($v); - } + return $self->_where_HASHREF($v); }, SCALARREF => sub { # literal SQL - $op eq 'NEST' - or puke "-$op => \\\$scalar not supported, use -nest => ..."; return ($$v); }, ARRAYREFREF => sub { # literal SQL - $op eq 'NEST' - or puke "-$op => \\[..] not supported, use -nest => ..."; return @{${$v}}; }, SCALAR => sub { # permissively interpreted as SQL - $op eq 'NEST' - or puke "-$op => 'scalar' not supported, use -nest => \\'scalar'"; belch "literal SQL should be -nest => \\'scalar' " . "instead of -nest => 'scalar' "; return ($v); @@ -496,6 +544,22 @@ sub _where_op_in_hash { } +sub _where_op_BOOL { + my ($self, $op, $v) = @_; + + my $prefix = $op eq 'BOOL' ? '' : 'NOT '; + $self->_SWITCH_refkind($v, { + SCALARREF => sub { # literal SQL + return ($prefix . $$v); + }, + + SCALAR => sub { # interpreted as SQL column + return ($prefix . $self->_convert($self->_quote($v))); + }, + }); +} + + sub _where_hashpair_ARRAYREF { my ($self, $k, $v) = @_; @@ -802,8 +866,6 @@ sub _where_field_IN { - - #====================================================================== # ORDER BY #====================================================================== @@ -1839,6 +1901,24 @@ Would give you: These are the two builtin "special operators"; but the list can be expanded : see section L below. +=head2 Boolean operators + +If you wish to test against boolean columns or functions within your +database you can use the C<-bool> and C<-not_bool> operators. For +example to test the column C being true and the column + being false you would use:- + + my %where = ( + -bool => 'is_user', + -not_bool => 'is_enabled', + ); + +Would give you: + + WHERE is_user AND NOT is_enabledmv + + + =head2 Nested conditions, -and/-or prefixes So far, we've seen how multiple conditions are joined with a top-level diff --git a/t/02where.t b/t/02where.t index c875047..c612c49 100644 --- a/t/02where.t +++ b/t/02where.t @@ -216,6 +216,55 @@ my @handle_tests = ( stmt => " WHERE (foo = ?)", bind => [ "bar" ], }, + + { + where => { -bool => \'function(x)' }, + stmt => " WHERE function(x)", + bind => [], + }, + + { + where => { -bool => 'foo' }, + stmt => " WHERE foo", + bind => [], + }, + + { + where => { -and => [-bool => 'foo', -bool => 'bar'] }, + stmt => " WHERE foo AND bar", + bind => [], + }, + + { + where => { -or => [-bool => 'foo', -bool => 'bar'] }, + stmt => " WHERE foo OR bar", + bind => [], + }, + + { + where => { -not_bool => \'function(x)' }, + stmt => " WHERE NOT function(x)", + bind => [], + }, + + { + where => { -not_bool => 'foo' }, + stmt => " WHERE NOT foo", + bind => [], + }, + + { + where => { -and => [-not_bool => 'foo', -not_bool => 'bar'] }, + stmt => " WHERE NOT foo AND NOT bar", + bind => [], + }, + + { + where => { -or => [-not_bool => 'foo', -not_bool => 'bar'] }, + stmt => " WHERE NOT foo OR NOT bar", + bind => [], + }, + ); plan tests => ( @handle_tests * 2 ) + 1;