Koha/C4/SQLHelper.pm
Paul Poulain 8449b14dcb Revert "Bug 8089: Use Koha::Cache for all caching"
This reverts commit 215abc8024.

The 3 patches for bug 8089 have been reverted, because they break
jenkins & Koha.
A follow-up has been provided, but it does not solve the problem on my
test server, it just changes the error message.

After a discussion with jared, Dobrica should work on another patch, so
the best option is to revert.
2012-09-12 14:12:41 +02:00

500 lines
13 KiB
Perl

package C4::SQLHelper;
# Copyright 2009 Biblibre SARL
#
# This file is part of Koha.
#
# Koha is free software; you can redistribute it and/or modify it under the
# terms of the GNU General Public License as published by the Free Software
# Foundation; either version 2 of the License, or (at your option) any later
# version.
#
# Koha is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE. See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with Koha; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
use strict;
use warnings;
use List::MoreUtils qw(first_value any);
use C4::Context;
use C4::Dates qw(format_date_in_iso);
use C4::Debug;
require Exporter;
use vars qw($VERSION @ISA @EXPORT_OK %EXPORT_TAGS);
eval {
my $servers = C4::Context->config('memcached_servers');
if ($servers) {
require Memoize::Memcached;
import Memoize::Memcached qw(memoize_memcached);
my $memcached = {
servers => [$servers],
key_prefix => C4::Context->config('memcached_namespace') || 'koha',
expire_time => 600
}; # cache for 10 mins
memoize_memcached( '_get_columns', memcached => $memcached );
memoize_memcached( 'GetPrimaryKeys', memcached => $memcached );
}
};
BEGIN {
# set the version for version checking
$VERSION = 3.07.00.049;
require Exporter;
@ISA = qw(Exporter);
@EXPORT_OK=qw(
InsertInTable
DeleteInTable
SearchInTable
UpdateInTable
GetPrimaryKeys
clear_columns_cache
);
%EXPORT_TAGS = ( all =>[qw( InsertInTable DeleteInTable SearchInTable UpdateInTable GetPrimaryKeys)]
);
}
my $tablename;
my $hashref;
=head1 NAME
C4::SQLHelper - Perl Module containing convenience functions for SQL Handling
=head1 SYNOPSIS
use C4::SQLHelper;
=head1 DESCRIPTION
This module contains routines for adding, modifying and Searching Data in MysqlDB
=head1 FUNCTIONS
=head2 SearchInTable
$hashref = &SearchInTable($tablename,$data, $orderby, $limit,
$columns_out, $filtercolumns, $searchtype);
$tablename Name of the table (string)
$data may contain
- string
- data_hashref : will be considered as an AND of all the data searched
- data_array_ref on hashrefs : Will be considered as an OR of Datahasref elements
$orderby is an arrayref of hashref with fieldnames as key and 0 or 1 as values (ASCENDING or DESCENDING order)
$limit is an array ref on 2 values in order to limit results to MIN..MAX
$columns_out is an array ref on field names is used to limit results on those fields (* by default)
$filtercolums is an array ref on field names : is used to limit expansion of research for strings
$searchtype is string Can be "start_with" or "exact"
This query builder is very limited, it should be replaced with DBIx::Class
or similar very soon
Meanwhile adding support for special key '' in case of a data_hashref to
support filters of type
( f1 = a OR f2 = a ) AND fx = b AND fy = c
Call for the query above is:
SearchInTable($tablename, {'' => a, fx => b, fy => c}, $orderby, $limit,
$columns_out, [f1, f2], 'exact');
NOTE: Current implementation may remove parts of the iinput hashrefs. If that is a problem
a copy needs to be created in _filter_fields() below
=cut
sub SearchInTable{
my ($tablename,$filters,$orderby, $limit, $columns_out, $filter_columns,$searchtype) = @_;
$searchtype||="exact";
my $dbh = C4::Context->dbh;
$columns_out||=["*"];
my $sql = do { local $"=', ';
qq{ SELECT @$columns_out from $tablename}
};
my $row;
my $sth;
my ($keys,$values)=_filter_fields($tablename,$filters,$searchtype,$filter_columns);
if ($keys){
my @criteria=grep{defined($_) && $_ !~/^\W$/ }@$keys;
if (@criteria) {
$sql.= do { local $"=') OR (';
qq{ WHERE (@criteria) }
};
}
}
if ($orderby){
#Order by desc by default
my @orders;
foreach my $order ( ref($orderby) ? @$orderby : $orderby ){
if (ref $order) {
push @orders,map{ "$_".($order->{$_}? " DESC " : "") } keys %$order;
} else {
push @orders,$order;
}
}
$sql.= do { local $"=', ';
qq{ ORDER BY @orders}
};
}
if ($limit){
$sql.=qq{ LIMIT }.join(",",@$limit);
}
$debug && $values && warn $sql," ",join(",",@$values);
$sth = $dbh->prepare_cached($sql);
eval{$sth->execute(@$values)};
warn $@ if ($@ && $debug);
my $results = $sth->fetchall_arrayref( {} );
return $results;
}
=head2 InsertInTable
$data_id_in_table = &InsertInTable($tablename,$data_hashref,$withprimarykeys);
Insert Data in table and returns the id of the row inserted
=cut
sub InsertInTable{
my ($tablename,$data,$withprimarykeys) = @_;
my $dbh = C4::Context->dbh;
my ($keys,$values)=_filter_hash($tablename,$data,($withprimarykeys?"exact":0));
my $query = qq{ INSERT INTO $tablename SET }.join(", ",@$keys);
$debug && warn $query, join(",",@$values);
my $sth = $dbh->prepare_cached($query);
eval{$sth->execute(@$values)};
warn $@ if ($@ && $debug);
return $dbh->last_insert_id(undef, undef, $tablename, undef);
}
=head2 UpdateInTable
$status = &UpdateInTable($tablename,$data_hashref);
Update Data in table and returns the status of the operation
=cut
sub UpdateInTable{
my ($tablename,$data) = @_;
my @field_ids=GetPrimaryKeys($tablename);
my @ids=@$data{@field_ids};
my $dbh = C4::Context->dbh;
my ($keys,$values)=_filter_hash($tablename,$data,0);
return unless ($keys);
my $query =
qq{ UPDATE $tablename
SET }.join(",",@$keys).qq{
WHERE }.join (" AND ",map{ "$_=?" }@field_ids);
$debug && warn $query, join(",",@$values,@ids);
my $sth = $dbh->prepare_cached($query);
my $result;
eval{$result=$sth->execute(@$values,@ids)};
warn $@ if ($@ && $debug);
return $result;
}
=head2 DeleteInTable
$status = &DeleteInTable($tablename,$data_hashref);
Delete Data in table and returns the status of the operation
=cut
sub DeleteInTable{
my ($tablename,$data) = @_;
my $dbh = C4::Context->dbh;
my ($keys,$values)=_filter_fields($tablename,$data,1);
if ($keys){
my $query = do { local $"=') AND (';
qq{ DELETE FROM $tablename WHERE (@$keys)};
};
$debug && warn $query, join(",",@$values);
my $sth = $dbh->prepare_cached($query);
my $result;
eval{$result=$sth->execute(@$values)};
warn $@ if ($@ && $debug);
return $result;
}
}
=head2 GetPrimaryKeys
@primarykeys = &GetPrimaryKeys($tablename)
Get the Primary Key field names of the table
=cut
sub GetPrimaryKeys($) {
my $tablename=shift;
my $hash_columns=_get_columns($tablename);
return grep { $hash_columns->{$_}->{'Key'} =~/PRI/i} keys %$hash_columns;
}
=head2 clear_columns_cache
C4::SQLHelper->clear_columns_cache();
cleans the internal cache of sysprefs. Please call this method if
you update a tables structure. Otherwise, your new changes
will not be seen by this process.
=cut
sub clear_columns_cache {
%$hashref = ();
}
=head2 _get_columns
_get_columns($tablename)
Given a tablename
Returns a hashref of all the fieldnames of the table
With
Key
Type
Default
=cut
sub _get_columns($) {
my ($tablename) = @_;
unless ( exists( $hashref->{$tablename} ) ) {
my $dbh = C4::Context->dbh;
my $sth = $dbh->prepare_cached(qq{SHOW COLUMNS FROM $tablename });
$sth->execute;
my $columns = $sth->fetchall_hashref(qw(Field));
$hashref->{$tablename} = $columns;
}
return $hashref->{$tablename};
}
=head2 _filter_columns
=over 4
_filter_columns($tablename,$research, $filtercolumns)
=back
Given
- a tablename
- indicator on purpose whether all fields should be returned or only non Primary keys
- array_ref to columns to limit to
Returns an array of all the fieldnames of the table
If it is not for research purpose, filter primary keys
=cut
sub _filter_columns ($$;$) {
my ($tablename,$research, $filtercolumns)=@_;
if ($filtercolumns){
return (@$filtercolumns);
}
else {
my $columns=_get_columns($tablename);
if ($research){
return keys %$columns;
}
else {
return grep {my $column=$_; any {$_ ne $column }GetPrimaryKeys($tablename) } keys %$columns;
}
}
}
=head2 _filter_fields
_filter_fields
Given
- a tablename
- a string or a hashref (containing, fieldnames and datatofilter) or an arrayref to one of those elements
- an indicator of operation whether it is a wide research or a narrow one
- an array ref to columns to restrict string filter to.
Returns a ref of key array to use in SQL functions
and a ref to value array
=cut
sub _filter_fields{
my ($tablename,$filter_input,$searchtype,$filtercolumns)=@_;
my @keys;
my @values;
if (ref($filter_input) eq "HASH"){
my ($keys, $values);
if (my $special = delete $filter_input->{''}) { # XXX destroyes '' key
($keys, $values) = _filter_fields($tablename,$special, $searchtype,$filtercolumns);
}
my ($hkeys, $hvalues) = _filter_hash($tablename,$filter_input, $searchtype);
if ($hkeys){
push @$keys, @$hkeys;
push @$values, @$hvalues;
}
if ($keys){
my $stringkey="(".join (") AND (",@$keys).")";
return [$stringkey],$values;
}
else {
return ();
}
} elsif (ref($filter_input) eq "ARRAY"){
foreach my $element_data (@$filter_input){
my ($localkeys,$localvalues)=_filter_fields($tablename,$element_data,$searchtype,$filtercolumns);
if ($localkeys){
@$localkeys=grep{defined($_) && $_ !~/^\W*$/}@$localkeys;
my $string=do{
local $"=") OR (";
qq{(@$localkeys)}
};
push @keys, $string;
push @values, @$localvalues;
}
}
}
else{
$debug && warn "filterstring : $filter_input";
my ($keys, $values) = _filter_string($tablename,$filter_input, $searchtype,$filtercolumns);
if ($keys){
my $stringkey="(".join (") AND (",@$keys).")";
return [$stringkey],$values;
}
else {
return ();
}
}
return (\@keys,\@values);
}
sub _filter_hash{
my ($tablename,$filter_input, $searchtype)=@_;
my (@values, @keys);
my $columns= _get_columns($tablename);
my @columns_filtered= _filter_columns($tablename,$searchtype);
#Filter Primary Keys of table
my $elements=join "|",@columns_filtered;
foreach my $field (grep {/\b($elements)\b/} keys %$filter_input){
## supposed to be a hash of simple values, hashes of arrays could be implemented
$filter_input->{$field}=format_date_in_iso($filter_input->{$field})
if $columns->{$field}{Type}=~/date/ &&
$filter_input->{$field} !~C4::Dates->regexp("iso");
my ($tmpkeys, $localvalues)=_Process_Operands($filter_input->{$field},"$tablename.$field",$searchtype,$columns);
if (@$tmpkeys){
push @values, @$localvalues;
push @keys, @$tmpkeys;
}
}
if (@keys){
return (\@keys,\@values);
}
else {
return ();
}
}
sub _filter_string{
my ($tablename,$filter_input, $searchtype,$filtercolumns)=@_;
return () unless($filter_input);
my @operands=split /\s+/,$filter_input;
# An act of desperation
$searchtype = 'contain' if @operands > 1 && $searchtype =~ /start_with/o;
my @columns_filtered= _filter_columns($tablename,$searchtype,$filtercolumns);
my $columns= _get_columns($tablename);
my (@values,@keys);
foreach my $operand (@operands){
my @localkeys;
foreach my $field (@columns_filtered){
my ($tmpkeys, $localvalues)=_Process_Operands($operand,"$tablename.$field",$searchtype,$columns);
if ($tmpkeys){
push @values,@$localvalues;
push @localkeys,@$tmpkeys;
}
}
my $sql= join (' OR ', @localkeys);
push @keys, $sql;
}
if (@keys){
return (\@keys,\@values);
}
else {
return ();
}
}
sub _Process_Operands{
my ($operand, $field, $searchtype,$columns)=@_;
my @values;
my @tmpkeys;
my @localkeys;
$operand = [$operand] unless ref $operand eq 'ARRAY';
foreach (@$operand) {
push @tmpkeys, " $field = ? ";
push @values, $_;
}
#By default, exact search
if (!$searchtype ||$searchtype eq "exact"){
return \@tmpkeys,\@values;
}
my $col_field=(index($field,".")>0?substr($field, index($field,".")+1):$field);
if ($field=~/(?<!zip)code|(?<!card)number/ && $searchtype ne "exact"){
push @tmpkeys,(" $field= '' ","$field IS NULL");
}
if ($columns->{$col_field}->{Type}=~/varchar|text/i){
my @localvaluesextended;
if ($searchtype eq "contain"){
foreach (@$operand) {
push @tmpkeys,(" $field LIKE ? ");
push @localvaluesextended,("\%$_\%") ;
}
}
if ($searchtype eq "field_start_with"){
foreach (@$operand) {
push @tmpkeys,("$field LIKE ?");
push @localvaluesextended, ("$_\%") ;
}
}
if ($searchtype eq "start_with"){
foreach (@$operand) {
push @tmpkeys,("$field LIKE ?","$field LIKE ?");
push @localvaluesextended, ("$_\%", " $_\%") ;
}
}
push @values,@localvaluesextended;
}
push @localkeys,qq{ (}.join(" OR ",@tmpkeys).qq{) };
return (\@localkeys,\@values);
}
1;