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## no critic |
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package DBIx::MultiStatementDo; |
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BEGIN { |
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$DBIx::MultiStatementDo::VERSION = '1.00009'; |
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} |
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## use critic |
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use Moose; |
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0
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use Carp qw(croak); |
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use SQL::SplitStatement 1.00009; |
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has 'dbh' => ( |
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is => 'rw', |
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isa => 'DBI::db', |
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required => 1 |
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); |
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has 'splitter_options' => ( |
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is => 'rw', |
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isa => 'Maybe[HashRef[Bool]]', |
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trigger => \&_set_splitter, |
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default => undef |
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); |
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sub _set_splitter { |
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my ($self, $new_options) = @_; |
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$self->_splitter( SQL::SplitStatement->new($new_options) ) |
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} |
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has '_splitter' => ( |
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is => 'rw', |
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isa => 'SQL::SplitStatement', |
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handles => [ qw(split split_with_placeholders) ], |
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lazy => 1, |
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default => sub { SQL::SplitStatement->new } |
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); |
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has 'rollback' => ( |
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is => 'rw', |
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isa => 'Bool', |
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default => 1 |
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); |
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sub do { |
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my ($self, $code, $attr, @bind_values) = @_; |
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my ( $statements, $placeholders ) |
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= ! ref($code) |
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? $self->split_with_placeholders($code) |
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: ref( $code->[0] ) eq 'ARRAY' |
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? @$code |
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: ( $code, undef ); |
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55
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my @compound_bind_values; |
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if ( @bind_values >= 1 ) { |
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if ( ! ref $bind_values[0] ) { |
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# @bind_values was a FLAT LIST |
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ref($placeholders) ne 'ARRAY' and croak( |
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q[Bind values as a flat list require the placeholder numbers listref to be passed as well] |
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); |
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push @compound_bind_values, [ splice @bind_values, 0, $_ ] |
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foreach @$placeholders |
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} else { |
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@compound_bind_values = @{ $bind_values[0] } |
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} |
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} |
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69
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70
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my $dbh = $self->dbh; |
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my @results; |
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73
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if ( $self->rollback ) { |
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local $dbh->{AutoCommit} = 0; |
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local $dbh->{RaiseError} = 1; |
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eval { |
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@results = $self->_do_statements( |
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$statements, $attr, \@compound_bind_values |
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); |
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$dbh->commit; |
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1 |
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} or eval { |
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$dbh->rollback |
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} |
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} else { |
86
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@results = $self->_do_statements( |
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$statements, $attr, \@compound_bind_values |
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) |
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} |
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return @results if wantarray; # List context. |
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return 1 if @results == @$statements; # Scalar context and success. |
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return # Scalar context and failure. |
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} |
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96
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sub _do_statements { |
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my ($self, $statements, $attr, $compound_bind_values) = @_; |
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99
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my @results; |
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my $dbh = $self->dbh; |
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102
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for my $statement ( @$statements ) { |
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my $result = $dbh->do( |
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$statement, $attr, @{ shift(@$compound_bind_values) || [] } |
105
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); |
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last unless $result; |
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push @results, $result |
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} |
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110
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return @results |
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} |
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113
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no Moose; |
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__PACKAGE__->meta->make_immutable; |
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116
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1; |
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118
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__END__ |
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120
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=head1 NAME |
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122
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DBIx::MultiStatementDo - Multiple SQL statements in a single do() call with any DBI driver |
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124
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=head1 VERSION |
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126
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version 1.00009 |
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128
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=head1 SYNOPSIS |
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130
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use DBI; |
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use DBIx::MultiStatementDo; |
132
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133
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# Multiple SQL statements in a single string |
134
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my $sql_code = <<'SQL'; |
135
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CREATE TABLE parent (a, b, c , d ); |
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CREATE TABLE child (x, y, "w;", "z;z"); |
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/* C-style comment; */ |
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CREATE TRIGGER "check;delete;parent;" BEFORE DELETE ON parent WHEN |
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EXISTS (SELECT 1 FROM child WHERE old.a = x AND old.b = y) |
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BEGIN |
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SELECT RAISE(ABORT, 'constraint failed;'); -- Inlined SQL comment |
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END; |
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-- Standalone SQL; comment; w/ semicolons; |
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INSERT INTO parent (a, b, c, d) VALUES ('pippo;', 'pluto;', NULL, NULL); |
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SQL |
146
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147
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my $dbh = DBI->connect( 'dbi:SQLite:dbname=my.db', '', '' ); |
148
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149
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my $batch = DBIx::MultiStatementDo->new( dbh => $dbh ); |
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151
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# Multiple SQL statements in a single call |
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my @results = $batch->do( $sql_code ) |
153
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or die $batch->dbh->errstr; |
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155
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print scalar(@results) . ' statements successfully executed!'; |
156
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# 4 statements successfully executed! |
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158
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=head1 DESCRIPTION |
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160
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Some DBI drivers don't support the execution of multiple statements in a single |
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C<do()> call. This module tries to overcome such limitation, letting you execute |
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any number of SQL statements (of any kind, not only DDL statements) in a single |
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batch, with any DBI driver. |
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165
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Here is how DBIx::MultiStatementDo works: behind the scenes it parses the SQL |
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code, splits it into the atomic statements it is composed of and executes them |
167
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one by one. To split the SQL code L<SQL::SplitStatement> is used, which uses a |
168
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more sophisticated logic than a raw C<split> on the C<;> (semicolon) character: |
169
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first, various different statement terminator I<tokens> are recognized, then |
170
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L<SQL::SplitStatement> is able to correctly handle the presence of said tokens |
171
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inside identifiers, values, comments, C<BEGIN ... END> blocks (even nested), |
172
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I<dollar-quoted> strings, MySQL custom C<DELIMITER>s, procedural code etc., |
173
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as (partially) exemplified in the L</SYNOPSIS> above. |
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175
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Automatic transactions support is offered by default, so that you'll have the |
176
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I<all-or-nothing> behaviour you would probably expect; if you prefer, you can |
177
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anyway disable it and manage the transactions yourself. |
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179
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=head1 METHODS |
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181
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=head2 C<new> |
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183
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=over 4 |
184
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185
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=item * C<< DBIx::MultiStatementDo->new( %options ) >> |
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187
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=item * C<< DBIx::MultiStatementDo->new( \%options ) >> |
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189
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=back |
190
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191
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It creates and returns a new DBIx::MultiStatementDo object. It accepts its |
192
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options either as an hash or an hashref. |
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194
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The following options are recognized: |
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196
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=over 4 |
197
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198
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=item * C<dbh> |
199
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200
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The database handle object as returned by L<DBI::connect()|DBI/connect>. This |
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option B<is required>. |
202
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203
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=item * C<rollback> |
204
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205
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A Boolean option which enables (when true) or disables (when false) automatic |
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transactions. It is set to a true value by default. |
207
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208
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=item * C<splitter_options> |
209
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210
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This is the options hashref which is passed unaltered to C<< |
211
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SQL::SplitStatement->new() >> to build the I<splitter object>, which is then |
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internally used by DBIx::MultiStatementDo to split the given SQL string. |
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It defaults to C<undef>, which should be the best value if the given SQL string |
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contains only standard SQL. If it contains contains also procedural code, you |
216
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may need to fine tune this option. |
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218
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Please refer to L<< SQL::SplitStatement::new()|SQL::SplitStatement/new >> to see |
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the options it takes. |
220
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221
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=back |
222
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223
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=head2 C<do> |
224
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225
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=over 4 |
226
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227
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=item * C<< $batch->do( $sql_string | \@sql_statements ) >> |
228
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229
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=item * C<< $batch->do( $sql_string | \@sql_statements , \%attr ) >> |
230
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231
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=item * C<< $batch->do( $sql_string | \@sql_statements , \%attr, \@bind_values | @bind_values ) >> |
232
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233
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=back |
234
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235
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This is the method which actually executes the SQL statements against your db. |
236
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As its first (mandatory) argument, it takes an SQL string containing one or more |
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SQL statements. The SQL string is split into its atomic statements, which are |
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then executed one-by-one, in the same order they appear in the given string. |
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The first argument can also be a reference to a list of (already split) |
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statements, in which case no split is performed and the statements are executed |
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as they appear in the list. The list can also be a two-elements list, where the |
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first element is the statements listref as above, and the second is the |
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I<placeholder numbers> listref, exactly as returned by the |
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L<< SQL::SplitStatement::split_with_placeholders()|SQL::SplitStatement/split_with_placeholders >> |
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method. |
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Analogously to DBI's C<do()>, it optionally also takes an hashref of attributes |
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(which is passed unaltered to C<< $batch->dbh->do() >> for each atomic |
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statement), and the I<bind values>, either as a listref or a flat list (see |
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below for the difference). |
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In list context, C<do> returns a list containing the values returned by the |
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C<< $batch->dbh->do() >> call on each single atomic statement. |
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If the C<rollback> option has been set (and therefore automatic transactions are |
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enabled), in case one of the atomic statements fails, all the other succeeding |
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statements executed so far, if any, are rolled back and the method (immediately) |
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returns an empty list (since no statements have actually been committed). |
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If the C<rollback> option is set to a false value (and therefore automatic |
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transactions are disabled), the method immediately returns at the first failing |
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statement as above, but it does not roll back any prior succeeding statement, |
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and therefore a list containing the values returned by the statements |
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(successfully) executed so far is returned (and these statements are actually |
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committed to the db, if C<< $dbh->{AutoCommit} >> is set). |
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In scalar context it returns, regardless of the value of the C<rollback> option, |
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C<undef> if any of the atomic statements failed, or a true value if all of the |
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atomic statements succeeded. |
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Note that to activate the automatic transactions you don't have to do anything |
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more than setting the C<rollback> option to a true value (or simply do nothing, |
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as it is the default): DBIx::MultiStatementDo will automatically (and |
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temporarily, via C<local>) set C<< $dbh->{AutoCommit} >> and |
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C<< $dbh->{RaiseError} >> as needed. |
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No other DBI db handle attribute is ever touched, so that you can for example |
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set C<< $dbh->{PrintError} >> and enjoy its effects in case of a failing |
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statement. |
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If you want to disable the automatic transactions and manage them by yourself, |
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you can do something along this: |
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my $batch = DBIx::MultiStatementDo->new( |
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dbh => $dbh, |
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rollback => 0 |
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); |
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my @results; |
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$batch->dbh->{AutoCommit} = 0; |
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$batch->dbh->{RaiseError} = 1; |
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eval { |
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@results = $batch->do( $sql_string ); |
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$batch->dbh->commit; |
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1 |
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} or eval { |
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$batch->dbh->rollback |
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}; |
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=head3 Bind Values as a List Reference |
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303
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The bind values can be passed as a reference to a list of listrefs, each of |
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which contains the bind values for the atomic statement it corresponds to. The |
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bind values I<inner> lists must match the corresponding atomic statements as |
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returned by the internal I<splitter object>, with C<undef> (or empty listref) |
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elements where the corresponding atomic statements have no I<placeholders>. |
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309
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Here is an example: |
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311
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# 7 statements (SQLite valid SQL) |
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my $sql_code = <<'SQL'; |
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CREATE TABLE state (id, name); |
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INSERT INTO state (id, name) VALUES (?, ?); |
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CREATE TABLE city (id, name, state_id); |
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INSERT INTO city (id, name, state_id) VALUES (?, ?, ?); |
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INSERT INTO city (id, name, state_id) VALUES (?, ?, ?); |
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DROP TABLE city; |
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DROP TABLE state |
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SQL |
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322
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# Only 5 elements are required in the bind values list |
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my $bind_values = [ |
324
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undef , # or [] |
325
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[ 1, 'Nevada' ] , |
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[] , # or undef |
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[ 1, 'Las Vegas' , 1 ], |
328
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[ 2, 'Carson City', 1 ] |
329
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]; |
330
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331
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my $batch = DBIx::MultiStatementDo->new( dbh => $dbh ); |
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333
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my @results = $batch->do( $sql_code, undef, $bind_values ) |
334
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or die $batch->dbh->errstr; |
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336
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If the last statements have no placeholders, the corresponding C<undef>s don't |
337
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need to be present in the bind values list, as shown above. |
338
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The bind values list can also have more elements than the number of the atomic |
339
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statements, in which case the excess elements will simply be ignored. |
340
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341
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=head3 Bind Values as a Flat List |
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343
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This is a much more powerful feature of C<do>: when it gets the bind values as a |
344
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flat list, it automatically assigns them to the corresponding placeholders (no |
345
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I<interleaving> C<undef>s are necessary in this case). |
346
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347
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In other words, you can regard the given SQL code as a single big statement and |
348
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pass the bind values exactly as you would do with the ordinary DBI C<do> method. |
349
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350
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For example, given C<$sql_code> from the example above, you could simply do: |
351
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352
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my @bind_values = ( 1, 'Nevada', 1, 'Las Vegas', 1, 2, 'Carson City', 1 ); |
353
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354
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my @results = $batch->do( $sql_code, undef, @bind_values ) |
355
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or die $batch->dbh->errstr; |
356
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357
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and get exactly the same result. |
358
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359
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=head3 Difference between Bind Values as a List Reference and as a Flat List |
360
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361
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If you want to pass the bind values as a flat list as described above, you must |
362
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pass the first parameter to C<do> either as a string (so that the internal |
363
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splitting is performed) or, if you want to disable the internal splitting, as a |
364
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reference to the two-elements list containing both the statements and the |
365
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placeholder numbers listrefs (as described above in L<do>). |
366
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367
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In other words, you can't pass the bind values as a flat list and pass at the |
368
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same time the (already split) statements without the placeholder numbers |
369
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listref. To do so, you need to pass the bind values as a list reference instead, |
370
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otherwise C<do> throws an exception. |
371
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372
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To summarize, bind values as a flat list is easier to use but it suffers from |
373
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this subtle limitation, while bind values as a list reference is a little bit |
374
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more cumbersome to use, but it has no limitations and can therefore always be |
375
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used. |
376
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377
|
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|
=head3 Recognized Placeholders |
378
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379
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|
The recognized placeholders are: |
380
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381
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=over 4 |
382
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383
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=item * I<question mark> placeholders, represented by the C<?> character; |
384
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385
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=item * I<dollar sign numbered> placeholders, represented by the |
386
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C<$1, $2, ..., $n> strings; |
387
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388
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=item * I<named parameters>, such as C<:foo>, C<:bar>, C<:baz> etc. |
389
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390
|
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=back |
391
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392
|
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|
|
=head2 C<dbh> |
393
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394
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=over 4 |
395
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396
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=item * C<< $batch->dbh >> |
397
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398
|
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|
|
=item * C<< $batch->dbh( $new_dbh ) >> |
399
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400
|
|
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|
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|
|
Getter/setter method for the C<dbh> option explained above. |
401
|
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402
|
|
|
|
|
|
|
=back |
403
|
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|
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404
|
|
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|
|
|
|
=head2 C<rollback> |
405
|
|
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406
|
|
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|
|
=over 4 |
407
|
|
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|
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408
|
|
|
|
|
|
|
=item * C<< $batch->rollback >> |
409
|
|
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|
|
|
410
|
|
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|
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|
|
=item * C<< $batch->rollback( $boolean ) >> |
411
|
|
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|
|
|
412
|
|
|
|
|
|
|
Getter/setter method for the C<rollback> option explained above. |
413
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|
|
|
414
|
|
|
|
|
|
|
=back |
415
|
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|
416
|
|
|
|
|
|
|
=head2 C<splitter_options> |
417
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|
418
|
|
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|
|
=over 4 |
419
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420
|
|
|
|
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|
|
=item * C<< $batch->splitter_options >> |
421
|
|
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422
|
|
|
|
|
|
|
=item * C<< $batch->splitter_options( \%options ) >> |
423
|
|
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|
|
424
|
|
|
|
|
|
|
Getter/setter method for the C<splitter_options> option explained above. |
425
|
|
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|
|
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|
|
426
|
|
|
|
|
|
|
=back |
427
|
|
|
|
|
|
|
|
428
|
|
|
|
|
|
|
=head2 C<split> and C<split_with_placeholders> |
429
|
|
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|
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430
|
|
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|
|
|
|
=over 4 |
431
|
|
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432
|
|
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|
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|
|
=item * C<< $batch->split( $sql_code ) >> |
433
|
|
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434
|
|
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|
|
=item * C<< $batch->split_with_placeholders( $sql_code ) >> |
435
|
|
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|
436
|
|
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|
|
|
=back |
437
|
|
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|
438
|
|
|
|
|
|
|
These are the methods used internally to split the given SQL code. |
439
|
|
|
|
|
|
|
They call respectively C<split> and C<split_with_placeholders> on a |
440
|
|
|
|
|
|
|
SQL::SplitStatement instance built with the C<splitter_options> |
441
|
|
|
|
|
|
|
described above. |
442
|
|
|
|
|
|
|
|
443
|
|
|
|
|
|
|
Normally they shouldn't be used directly, but they could be useful if |
444
|
|
|
|
|
|
|
you want to see how your SQL code has been split. |
445
|
|
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|
|
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|
|
446
|
|
|
|
|
|
|
If you want instead to see how your SQL code I<will be> split, that is |
447
|
|
|
|
|
|
|
before executing C<do>, you can use SQL::SplitStatement by yourself: |
448
|
|
|
|
|
|
|
|
449
|
|
|
|
|
|
|
use SQL::SplitStatement; |
450
|
|
|
|
|
|
|
my $splitter = SQL::SplitStatement->new( \%splitter_options ); |
451
|
|
|
|
|
|
|
my @statements = $splitter->split( $sql_code ); |
452
|
|
|
|
|
|
|
# Now you can check @statements if you want... |
453
|
|
|
|
|
|
|
|
454
|
|
|
|
|
|
|
and then you can execute your statements preventing C<do> from performing |
455
|
|
|
|
|
|
|
the splitting again, by passing C<\@statements> to it: |
456
|
|
|
|
|
|
|
|
457
|
|
|
|
|
|
|
my $batch = DBIx::MultiStatementDo->new( dbh => $dbh ); |
458
|
|
|
|
|
|
|
my @results = $batch->do( \@statements ); # This does not perform the splitting again. |
459
|
|
|
|
|
|
|
|
460
|
|
|
|
|
|
|
B<Warning!> In previous versions, the C<split_with_placeholders> (public) method |
461
|
|
|
|
|
|
|
documented above did not work, so there is the possibility that someone |
462
|
|
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|
|
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used the (private, undocumented) C<_split_with_placeholders> method instead |
463
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(which worked correctly). |
464
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In this case, please start using the public method (which now works as |
465
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advertised), since the private method will be removed in future versions. |
466
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467
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=head1 LIMITATIONS |
468
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469
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Please look at: L<< SQL::SplitStatement LIMITATIONS|SQL::SplitStatement/LIMITATIONS >> |
470
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471
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=head1 DEPENDENCIES |
472
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473
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DBIx::MultiStatementDo depends on the following modules: |
474
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475
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=over 4 |
476
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477
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=item * L<SQL::SplitStatement> 0.10000 or newer |
478
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479
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=item * L<Moose> |
480
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481
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=back |
482
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483
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=head1 AUTHOR |
484
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485
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Emanuele Zeppieri, C<< <emazep@cpan.org> >> |
486
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487
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=head1 BUGS |
488
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489
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No known bugs so far. |
490
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491
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Please report any bugs or feature requests to |
492
|
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C<bug-dbix-MultiStatementDo at rt.cpan.org>, or through the web interface at |
493
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L<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=DBIx-MultiStatementDo>. |
494
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I will be notified, and then you'll automatically be notified of progress |
495
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on your bug as I make changes. |
496
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497
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=head1 SUPPORT |
498
|
|
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|
499
|
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|
You can find documentation for this module with the perldoc command. |
500
|
|
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501
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perldoc DBIx::MultiStatementDo |
502
|
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503
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|
You can also look for information at: |
504
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505
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|
=over 4 |
506
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507
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|
=item * RT: CPAN's request tracker |
508
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509
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|
L<http://rt.cpan.org/NoAuth/Bugs.html?Dist=DBIx-MultiStatementDo> |
510
|
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511
|
|
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|
=item * AnnoCPAN: Annotated CPAN documentation |
512
|
|
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513
|
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L<http://annocpan.org/dist/DBIx-MultiStatementDo> |
514
|
|
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515
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|
=item * CPAN Ratings |
516
|
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517
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L<http://cpanratings.perl.org/d/DBIx-MultiStatementDo> |
518
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519
|
|
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|
|
|
|
=item * Search CPAN |
520
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521
|
|
|
|
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|
|
L<http://search.cpan.org/dist/DBIx-MultiStatementDo/> |
522
|
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523
|
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|
=back |
524
|
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|
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|
|
525
|
|
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|
=head1 ACKNOWLEDGEMENTS |
526
|
|
|
|
|
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|
|
527
|
|
|
|
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|
|
Matt S Trout, for having suggested a much more suitable name |
528
|
|
|
|
|
|
|
for this module. |
529
|
|
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|
530
|
|
|
|
|
|
|
=head1 SEE ALSO |
531
|
|
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|
|
532
|
|
|
|
|
|
|
=over 4 |
533
|
|
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|
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|
|
534
|
|
|
|
|
|
|
=item * L<SQL::SplitStatement> |
535
|
|
|
|
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|
|
536
|
|
|
|
|
|
|
=item * L<DBI> |
537
|
|
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|
|
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|
|
538
|
|
|
|
|
|
|
=back |
539
|
|
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|
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|
|
540
|
|
|
|
|
|
|
=head1 LICENSE AND COPYRIGHT |
541
|
|
|
|
|
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|
|
542
|
|
|
|
|
|
|
Copyright 2010-2011 Emanuele Zeppieri. |
543
|
|
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|
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|
|
|
544
|
|
|
|
|
|
|
This program is free software; you can redistribute it and/or modify it |
545
|
|
|
|
|
|
|
under the terms of either: the GNU General Public License as published |
546
|
|
|
|
|
|
|
by the Free Software Foundation, or the Artistic License. |
547
|
|
|
|
|
|
|
|
548
|
|
|
|
|
|
|
See http://dev.perl.org/licenses/ for more information. |
549
|
|
|
|
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|
|
550
|
|
|
|
|
|
|
=cut |