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.IX Title "SQL::Abstract::Plugin::BangOverrides 3pm"
.TH SQL::Abstract::Plugin::BangOverrides 3pm "2021-09-30" "perl v5.32.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
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.SH "NAME"
SQL::Abstract::Plugin::BangOverrides
.SS "\s-1SYNOPSIS\s0"
.IX Subsection "SYNOPSIS"
.Vb 3
\&  $sqla\->plugin(\*(Aq+BangOverrides\*(Aq);
\&  ...
\&  profit();
.Ve
.SH "METHODS"
.IX Header "METHODS"
.SS "register_extensions"
.IX Subsection "register_extensions"
Wraps all currently existing clause based statements such that when a clause
of '!name' is encountered, if its value is a coderef, it's called with the
original value of the 'name' clause and expected to return a replacement, and
if not, it's simply used as a direct replacement.
.PP
This allows for passing data through existing systems that attempt to have
their own handling for thing but whose capabilities are now superceded by
SQL::Abstract, and is primarily useful to provide access to experimental
feature bundles such as SQL::Abstract::Plugin::ExtraClauses.
.PP
As an example of such a thing, given an appropriate \s-1DBIC\s0 setup
(see \f(CW\*(C`examples/bangdbic.pl\*(C'\fR):
.PP
.Vb 1
\&  $s\->storage\->sqlmaker\->plugin(\*(Aq+ExtraClauses\*(Aq)\->plugin(\*(Aq+BangOverrides\*(Aq);
\&
\&  my $rs2 = $s\->resultset(\*(AqFoo\*(Aq)\->search({
\&    \-op => [ \*(Aq=\*(Aq, { \-ident => \*(Aqouter.y\*(Aq }, { \-ident => \*(Aqme.x\*(Aq } ]
\&  });
\&  # (SELECT me.x, me.y, me.z FROM foo me WHERE ( outer.y = me.x ))
\&
\&  my $rs3 = $rs2\->search({}, {
\&    \*(Aq!from\*(Aq => sub { my ($sqla, $from) = @_;
\&      my $base = $sqla\->expand_expr({ \-old_from => $from });
\&      return [ $base, \-join => [ \*(Aqwub\*(Aq, on => [ \*(Aqme.z\*(Aq => \*(Aqwub.z\*(Aq ] ] ];
\&    }
\&  });
\&  # (SELECT me.x, me.y, me.z FROM foo me JOIN wub ON me.z = wub.z WHERE ( outer.y = me.x ))
\&
\&  my $rs4 = $rs3\->search({}, {
\&    \*(Aq!with\*(Aq => [ [ qw(wub x y z) ], $s\->resultset(\*(AqBar\*(Aq)\->as_query ],
\&  });
\&  # (WITH wub(x, y, z) AS (SELECT me.a, me.b, me.c FROM bar me) SELECT me.x, me.y, me.z FROM foo me JOIN wub ON me.z = wub.z WHERE ( outer.y = me.x ))
\&
\&  my $rs5 = $rs\->search({}, { select => [ { \-coalesce => [ { \-ident => \*(Aqx\*(Aq }, { \-value => 7 } ] } ] });
\&  # (SELECT \-COALESCE( \-IDENT( x ), \-VALUE( 7 ) ) FROM foo me WHERE ( z = ? ))
\&
\&  my $rs6 = $rs\->search({}, { \*(Aq!select\*(Aq => [ { \-coalesce => [ { \-ident => \*(Aqx\*(Aq }, { \-value => 7 } ] } ] });
\&  # (SELECT COALESCE(x, ?) FROM foo me WHERE ( z = ? ))
.Ve