805 lines
19 KiB
Perl
805 lines
19 KiB
Perl
package WebGUI::SQL;
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=head1 LEGAL
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-------------------------------------------------------------------
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WebGUI is Copyright 2001-2004 Plain Black Corporation.
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-------------------------------------------------------------------
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Please read the legal notices (docs/legal.txt) and the license
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(docs/license.txt) that came with this distribution before using
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this software.
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-------------------------------------------------------------------
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http://www.plainblack.com info@plainblack.com
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-------------------------------------------------------------------
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=cut
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use DBI;
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use Exporter;
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use strict;
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use Tie::IxHash;
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use WebGUI::ErrorHandler;
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use WebGUI::Id;
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use WebGUI::Session;
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use WebGUI::Utility;
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our @ISA = qw(Exporter);
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our @EXPORT = qw("e &getNextId "eAndJoin);
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=head1 NAME
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Package WebGUI::SQL
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=head1 DESCRIPTION
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Package for interfacing with SQL databases. This package implements Perl DBI functionality in a less code-intensive manner and adds some extra functionality.
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=head1 SYNOPSIS
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use WebGUI::SQL;
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my $sth = WebGUI::SQL->prepare($sql);
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$sth->execute(@values);
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$sth = WebGUI::SQL->read($sql);
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$sth = WebGUI::SQL->unconditionalRead($sql);
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@arr = $sth->array;
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@arr = $sth->getColumnNames;
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%hash = $sth->hash;
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$hashRef = $sth->hashRef;
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$num = $sth->rows;
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$sth->finish;
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WebGUI::SQL->write($sql);
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WebGUI::SQL->beginTransaction;
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WebGUI::SQL->commit;
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WebGUI::SQL->rollback;
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@arr = WebGUI::SQL->buildArray($sql);
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$arrayRef = WebGUI::SQL->buildArrayRef($sql);
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%hash = WebGUI::SQL->buildHash($sql);
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$hashRef = WebGUI::SQL->buildHashRef($sql);
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@arr = WebGUI::SQL->quickArray($sql);
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$text = WebGUI::SQL->quickCSV($sql);
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%hash = WebGUI::SQL->quickHash($sql);
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$hashRef = WebGUI::SQL->quickHashRef($sql);
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$text = WebGUI::SQL->quickTab($sql);
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$dbh = WebGUI::SQL->getSlave;
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$id = getNextId("wobjectId");
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$string = quote($string);
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=head1 METHODS
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These methods are available from this package:
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=cut
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#-------------------------------------------------------------------
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sub _getDefaultDb {
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return $WebGUI::Session::session{dbh};
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}
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#-------------------------------------------------------------------
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=head2 array ( )
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Returns the next row of data as an array.
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=cut
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sub array {
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return $_[0]->{_sth}->fetchrow_array() or WebGUI::ErrorHandler::fatalError("Couldn't fetch array. ".$_[0]->{_sth}->errstr);
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}
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#-------------------------------------------------------------------
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=head2 beginTransaction ( [ dbh ])
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Starts a transaction sequence. To be used with commit and rollback. Any writes after this point will not be applied to the database until commit is called.
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=head3 dbh
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A database handler. Defaults to the WebGUI default database handler.
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=cut
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sub beginTransaction {
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my $class = shift;
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my $dbh = shift;
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$dbh->begin_work;
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}
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#-------------------------------------------------------------------
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=head2 buildArray ( sql [, dbh ] )
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Builds an array of data from a series of rows.
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=head3 sql
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An SQL query. The query must select only one column of data.
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=head3 dbh
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By default this method uses the WebGUI database handler. However, you may choose to pass in your own if you wish.
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=cut
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sub buildArray {
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my ($sth, $data, @array, $i);
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$sth = WebGUI::SQL->read($_[1],$_[2]);
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$i=0;
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while (($data) = $sth->array) {
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$array[$i] = $data;
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$i++;
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}
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$sth->finish;
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return @array;
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}
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#-------------------------------------------------------------------
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=head2 buildArrayRef ( sql [, dbh ] )
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Builds an array reference of data from a series of rows.
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=head3 sql
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An SQL query. The query must select only one column of data.
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=head3 dbh
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By default this method uses the WebGUI database handler. However, you may choose to pass in your own if you wish.
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=cut
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sub buildArrayRef {
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my @array = $_[0]->buildArray($_[1],$_[2]);
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return \@array;
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}
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#-------------------------------------------------------------------
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=head2 buildHash ( sql [, dbh ] )
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Builds a hash of data from a series of rows.
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=head3 sql
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An SQL query. The query must select at least two columns of data, the first being the key for the hash, the second being the value. If the query selects more than two columns, then the last column will be the value and the remaining columns will be joined together by an underscore "_" to form a complex key.
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=head3 dbh
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By default this method uses the WebGUI database handler. However, you may choose to pass in your own if you wish.
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=cut
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sub buildHash {
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my ($sth, %hash, @data);
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tie %hash, "Tie::IxHash";
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$sth = WebGUI::SQL->read($_[1],$_[2]);
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while (@data = $sth->array) {
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my $value = pop @data;
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my $key = join("_",@data);
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$hash{$key} = $value;
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}
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$sth->finish;
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return %hash;
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}
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#-------------------------------------------------------------------
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=head2 buildHashRef ( sql [, dbh ] )
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Builds a hash reference of data from a series of rows.
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=head3 sql
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An SQL query. The query must select at least two columns of data, the first being the key for the hash, the second being the value. If the query selects more than two columns, then the last column will be the value and the remaining columns will be joined together by an underscore "_" to form a complex key.
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=head3 dbh
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By default this method uses the WebGUI database handler. However, you may choose to pass in your own if you wish.
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=cut
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sub buildHashRef {
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my ($sth, %hash);
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tie %hash, "Tie::IxHash";
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%hash = $_[0]->buildHash($_[1],$_[2]);
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return \%hash;
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}
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#-------------------------------------------------------------------
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=head2 commit ( [ dbh ])
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Ends a transaction sequence. To be used with beginTransaction. Applies all of the writes since beginTransaction to the database.
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=head3 dbh
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A database handler. Defaults to the WebGUI default database handler.
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=cut
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sub commit {
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my $class = shift;
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my $dbh = shift;
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$dbh->commit;
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}
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#-------------------------------------------------------------------
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=head2 errorCode {
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Returns an error code for the current handler.
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=cut
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sub errorCode {
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return $_[0]->{_sth}->err;
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}
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#-------------------------------------------------------------------
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=head2 errorMessage {
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Returns a text error message for the current handler.
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=cut
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sub errorMessage {
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return $_[0]->{_sth}->errstr;
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}
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#-------------------------------------------------------------------
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=head2 execute ( values )
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Executes a prepared SQL statement.
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=head3 values
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A list of values to be used in the placeholders defined in the prepared statement.
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=cut
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sub execute {
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my $self = shift;
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my $sql = shift;
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$self->{_sth}->execute or WebGUI::ErrorHandler::fatalError("Couldn't execute prepared statement: $sql Root cause: ". DBI->errstr);
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}
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#-------------------------------------------------------------------
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=head2 finish ( )
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Ends a query after calling the "read" method.
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=cut
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sub finish {
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$_[0]->{_sth}->finish;
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return "";
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}
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#-------------------------------------------------------------------
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=head2 getColumnNames {
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Returns an array of column names. Use with a "read" method.
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=cut
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sub getColumnNames {
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return @{$_[0]->{_sth}->{NAME}};
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}
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#-------------------------------------------------------------------
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=head2 getNextId ( idName )
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Increments an incrementer of the specified type and returns the value.
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B<NOTE:> This is not a regular method, but is an exported subroutine.
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=head3 idName
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Specify the name of one of the incrementers in the incrementer table.
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=cut
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sub getNextId {
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my ($id);
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($id) = WebGUI::SQL->quickArray("select nextValue from incrementer where incrementerId='$_[0]'");
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WebGUI::SQL->write("update incrementer set nextValue=nextValue+1 where incrementerId='$_[0]'");
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return $id;
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}
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#-------------------------------------------------------------------
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=head2 getRow ( table, key, keyValue [, dbh ] )
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Returns a row of data as a hash reference from the specified table.
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=head3 table
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The name of the table to retrieve the row of data from.
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=head3 key
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The name of the column to use as the retrieve key. Should be a primary or unique key in the table.
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=head3 keyValue
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The value to search for in the key column.
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=head3 dbh
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A database handler to use. Defaults to the WebGUI database handler.
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=cut
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sub getRow {
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my ($self, $table, $key, $keyValue, $dbh) = @_;
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my $row = WebGUI::SQL->quickHashRef("select * from $table where ".$key."=".quote($keyValue), $dbh);
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return $row;
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}
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#-------------------------------------------------------------------
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=head2 getSlave ( )
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Returns a random slave database handler, if one is defined, otherwise it returns undef. Likewise if admin mode is on it returns undef.
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=cut
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sub getSlave {
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if ($WebGUI::Session::session{var}{adminOn}) {
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return undef;
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} else {
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return $WebGUI::Session::session{slave}->[rand @{$WebGUI::Session::session{slave}}];
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}
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}
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#-------------------------------------------------------------------
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=head2 hash ( )
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Returns the next row of data in the form of a hash. Must be executed on a statement handler returned by the "read" method.
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=cut
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sub hash {
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my ($hashRef);
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$hashRef = $_[0]->{_sth}->fetchrow_hashref();
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if (defined $hashRef) {
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return %{$hashRef};
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} else {
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return ();
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}
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}
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#-------------------------------------------------------------------
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=head2 hashRef ( )
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Returns the next row of data in the form of a hash reference. Must be executed on a statement handler returned by the "read" method.
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=cut
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sub hashRef {
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my ($hashRef, %hash);
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$hashRef = $_[0]->{_sth}->fetchrow_hashref();
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tie %hash, 'Tie::CPHash';
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if (defined $hashRef) {
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%hash = %{$hashRef};
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return \%hash;
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} else {
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return $hashRef;
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}
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}
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#-------------------------------------------------------------------
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=head2 prepare ( sql [, dbh ] ) {
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Returns a statement handler. To be used in creating prepared statements. Use with the execute method.
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=head3 sql
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An SQL statement. Can use the "?" placeholder for maximum performance on multiple statements with the execute method.
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=head3 dbh
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A database handler. Defaults to the WebGUI default database handler.
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=cut
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sub prepare {
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my $class = shift;
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my $sql = shift;
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my $dbh = shift || _getDefaultDb();
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if ($WebGUI::Session::session{setting}{showDebug}) {
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push(@{$WebGUI::Session::session{SQLquery}},$sql);
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}
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my $sth = $dbh->prepare($sql) or WebGUI::ErrorHandler::fatalError("Couldn't prepare statement: ".$sql." : ". DBI->errstr);
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bless ({_sth => $sth}, $class);
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}
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#-------------------------------------------------------------------
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=head2 quickArray ( sql [, dbh ] )
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Executes a query and returns a single row of data as an array.
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=head3 sql
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An SQL query.
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=head3 dbh
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By default this method uses the WebGUI database handler. However, you may choose to pass in your own if you wish.
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=cut
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sub quickArray {
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my ($sth, @data);
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$sth = WebGUI::SQL->read($_[1],$_[2]);
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@data = $sth->array;
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$sth->finish;
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return @data;
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}
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#-------------------------------------------------------------------
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=head2 quickCSV ( sql [, dbh ] )
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Executes a query and returns a comma delimited text blob with column headers.
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=head3 sql
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An SQL query.
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=head3 dbh
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By default this method uses the WebGUI database handler. However, you may choose to pass in your own if you wish.
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=cut
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sub quickCSV {
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my ($sth, $output, @data);
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$sth = WebGUI::SQL->read($_[1],$_[2]);
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$output = join(",",$sth->getColumnNames)."\n";
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while (@data = $sth->array) {
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makeArrayCommaSafe(\@data);
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$output .= join(",",@data)."\n";
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}
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$sth->finish;
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return $output;
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}
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#-------------------------------------------------------------------
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=head2 quickHash ( sql [, dbh ] )
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Executes a query and returns a single row of data as a hash.
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=head3 sql
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An SQL query.
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=head3 dbh
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By default this method uses the WebGUI database handler. However, you may choose to pass in your own if you wish.
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=cut
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sub quickHash {
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my ($sth, $data);
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$sth = WebGUI::SQL->read($_[1],$_[2]);
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$data = $sth->hashRef;
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$sth->finish;
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if (defined $data) {
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return %{$data};
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} else {
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return ();
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}
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}
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#-------------------------------------------------------------------
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=head2 quickHashRef ( sql [, dbh ] )
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Executes a query and returns a single row of data as a hash reference.
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=head3 sql
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An SQL query.
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=head3 dbh
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By default this method uses the WebGUI database handler. However, you may choose to pass in your own if you wish.
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=cut
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sub quickHashRef {
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my $self = shift;
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my $sql = shift;
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my $dbh = shift;
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my $sth = WebGUI::SQL->read($sql,$dbh);
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my $data = $sth->hashRef;
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$sth->finish;
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if (defined $data) {
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return $data;
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} else {
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return {};
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}
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}
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#-------------------------------------------------------------------
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=head2 quickTab ( sql [, dbh ] )
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Executes a query and returns a tab delimited text blob with column headers.
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=head3 sql
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An SQL query.
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=head3 dbh
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By default this method uses the WebGUI database handler. However, you may choose to pass in your own if you wish.
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=cut
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sub quickTab {
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my ($sth, $output, @data);
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$sth = WebGUI::SQL->read($_[1],$_[2]);
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$output = join("\t",$sth->getColumnNames)."\n";
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while (@data = $sth->array) {
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makeArrayTabSafe(\@data);
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$output .= join("\t",@data)."\n";
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}
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$sth->finish;
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return $output;
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}
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#-------------------------------------------------------------------
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=head2 quote ( string [ , dbh ] )
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Returns a string quoted and ready for insert into the database.
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B<NOTE:> This is not a regular method, but is an exported subroutine.
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=head3 string
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Any scalar variable that needs to be escaped to be inserted into the database.
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=head3 dbh
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The database handler. Defaults to the WebGUI database handler.
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=cut
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sub quote {
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my $value = shift;
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my $dbh = shift || _getDefaultDb();
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return $dbh->quote($value);
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}
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#-------------------------------------------------------------------
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=head2 quoteAndJoin ( arrayRef [ , dbh ] )
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Returns a comma seperated string quoted and ready for insert/select into/from the database. This is typically used for a statement like "select * from someTable where field in (".quoteAndJoin(\@strings).")".
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B<NOTE:> This is not a regular method, but is an exported subroutine.
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=head3 arrayRef
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An array reference containing strings to be quoted.
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=head3 dbh
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The database handler. Defaults to the WebGUI database handler.
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=cut
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sub quoteAndJoin {
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my $arrayRef = shift;
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my $dbh = shift || _getDefaultDb();
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my @newArray;
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foreach my $value (@$arrayRef) {
|
|
push(@newArray,$dbh->quote($value));
|
|
}
|
|
return join(",",@newArray);
|
|
}
|
|
|
|
|
|
#-------------------------------------------------------------------
|
|
|
|
=head2 read ( sql [, dbh ] )
|
|
|
|
Returns a statement handler. This is a utility method that runs both a prepare and execute all in one.
|
|
|
|
=head3 sql
|
|
|
|
An SQL query.
|
|
|
|
=head3 dbh
|
|
|
|
By default this method uses the WebGUI database handler. However, you may choose to pass in your own if you wish.
|
|
|
|
=cut
|
|
|
|
sub read {
|
|
my $class = shift;
|
|
my $sql = shift;
|
|
my $dbh = shift;
|
|
my $sth = WebGUI::SQL->prepare($sql, $dbh);
|
|
$sth->execute($sql);
|
|
return $sth;
|
|
}
|
|
|
|
|
|
#-------------------------------------------------------------------
|
|
|
|
=head2 rollback ( [ dbh ])
|
|
|
|
Ends a transaction sequence. To be used with beginTransaction. Cancels all of the writes since beginTransaction.
|
|
|
|
=head3 dbh
|
|
|
|
A database handler. Defaults to the WebGUI default database handler.
|
|
|
|
=cut
|
|
|
|
sub rollback {
|
|
my $class = shift;
|
|
my $dbh = shift;
|
|
$dbh->rollback;
|
|
}
|
|
|
|
|
|
#-------------------------------------------------------------------
|
|
|
|
=head2 rows ( )
|
|
|
|
Returns the number of rows in a statement handler created by the "read" method.
|
|
|
|
=cut
|
|
|
|
sub rows {
|
|
return $_[0]->{_sth}->rows;
|
|
}
|
|
|
|
|
|
#-------------------------------------------------------------------
|
|
|
|
=head2 setRow ( table, key, data [, dbh ] )
|
|
|
|
Inserts/updates a row of data into the database. Returns the value of the key.
|
|
|
|
=head3 table
|
|
|
|
The name of the table to use.
|
|
|
|
=head3 key
|
|
|
|
The name of the primary key of the table.
|
|
|
|
=head3 data
|
|
|
|
A hash reference containing column names and values to be set.
|
|
|
|
=head3 dbh
|
|
|
|
A database handler to use. Defaults to the WebGUI database handler.
|
|
|
|
=cut
|
|
|
|
sub setRow {
|
|
my ($self, $table, $keyColumn, $data, $dbh) = @_;
|
|
if ($data->{$keyColumn} eq "new") {
|
|
$data->{$keyColumn} = WebGUI::Id::generate();
|
|
WebGUI::SQL->write("insert into $table ($keyColumn) values (".quote($data->{$keyColumn}).")", $dbh);
|
|
}
|
|
my (@pairs);
|
|
foreach my $key (keys %{$data}) {
|
|
unless ($key eq $keyColumn) {
|
|
push(@pairs, $key.'='.quote($data->{$key}));
|
|
}
|
|
}
|
|
if ($pairs[0] ne "") {
|
|
WebGUI::SQL->write("update $table set ".join(", ", @pairs)." where ".$keyColumn."=".quote($data->{$keyColumn}), $dbh);
|
|
}
|
|
return $data->{$keyColumn};
|
|
}
|
|
|
|
|
|
#-------------------------------------------------------------------
|
|
|
|
=head2 unconditionalRead ( sql [, dbh ] )
|
|
|
|
An alias of the "read" method except that it will not cause a fatal error in WebGUI if the query is invalid. This is useful for user generated queries such as those in the SQL Report. Returns a statement handler.
|
|
|
|
=head3 sql
|
|
|
|
An SQL query.
|
|
|
|
=head3 dbh
|
|
|
|
By default this method uses the WebGUI database handler. However, you may choose to pass in your own if you wish.
|
|
|
|
=cut
|
|
|
|
sub unconditionalRead {
|
|
my $class = shift;
|
|
my $sql = shift;
|
|
my $dbh = shift || _getDefaultDb();
|
|
if ($WebGUI::Session::session{setting}{showDebug}) {
|
|
push(@{$WebGUI::Session::session{SQLquery}},$sql);
|
|
}
|
|
my $sth = $dbh->prepare($sql) or WebGUI::ErrorHandler::warn("Unconditional read failed: ".$sql." : ".DBI->errstr);
|
|
if ($sth) {
|
|
$sth->execute or WebGUI::ErrorHandler::warn("Unconditional read failed: ".$sql." : ".DBI->errstr);
|
|
bless ({_sth => $sth}, $class);
|
|
}
|
|
}
|
|
|
|
|
|
#-------------------------------------------------------------------
|
|
|
|
=head2 write ( sql [, dbh ] )
|
|
|
|
A method specifically designed for writing to the database in an efficient manner.
|
|
|
|
=head3 sql
|
|
|
|
An SQL insert or update.
|
|
|
|
=head3 dbh
|
|
|
|
By default this method uses the WebGUI database handler. However, you may choose to pass in your own if you wish.
|
|
|
|
=cut
|
|
|
|
sub write {
|
|
my $class = shift;
|
|
my $sql = shift;
|
|
my $dbh = shift || _getDefaultDb();
|
|
if ($WebGUI::Session::session{setting}{showDebug}) {
|
|
push(@{$WebGUI::Session::session{SQLquery}},$sql);
|
|
}
|
|
$dbh->do($sql) or WebGUI::ErrorHandler::fatalError("Couldn't write to the database: ".$sql." : ". DBI->errstr);
|
|
}
|
|
|
|
|
|
1;
|
|
|