[30355] | 1 | ###############################################################################
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| 2 | #
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| 3 | # DBDrivers/SQLITE.pm -- utility functions for writing to sqlite databases
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| 4 | #
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| 5 | # A component of the Greenstone digital library software from the New Zealand
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| 6 | # Digital Library Project at the University of Waikato, New Zealand.
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| 7 | #
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| 8 | # Copyright (C) 2009-2010 DL Consulting Ltd.
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| 9 | # Copyright (C) 2009-2015 New Zealand Digital Library Project
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| 10 | #
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| 11 | # This program is free software; you can redistribute it and/or modify it under
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| 12 | # the terms of the GNU General Public License as published by the Free Software
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| 13 | # Foundation; either version 2 of the License, or (at your option) any later
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| 14 | # version.
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| 15 | #
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| 16 | # This program is distributed in the hope that it will be useful, but WITHOUT
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| 17 | # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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| 18 | # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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| 19 | # more details.
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| 20 | #
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| 21 | # You should have received a copy of the GNU General Public License along with
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| 22 | # this program; if not, write to the Free Software Foundation, Inc., 675 Mass
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| 23 | # Ave, Cambridge, MA 02139, USA.
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| 24 | #
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| 25 | ###############################################################################
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| 26 |
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| 27 | package DBDrivers::SQLITE;
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| 28 |
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| 29 | # Pragma
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| 30 | use strict;
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| 31 |
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| 32 | # Libraries
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| 33 | use util;
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| 34 | use parent 'DBDrivers::BaseDBDriver';
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| 35 |
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| 36 | sub BEGIN
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| 37 | {
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| 38 | if (!defined $ENV{'GSDLHOME'} || !defined $ENV{'GSDLOS'}) {
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| 39 | die("Error! Environment must be prepared by sourcing setup.bash\n");
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| 40 | }
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| 41 | @DBDrivers::SQLITE::ISA = ( 'DBDrivers::BaseDBDriver' );
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| 42 | }
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| 43 |
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| 44 | sub new
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| 45 | {
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| 46 | my $class = shift(@_);
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| 47 | my $self = DBDrivers::BaseDBDriver->new(@_);
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| 48 | $self->{'default_file_extension'} = 'db';
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| 49 | # Please set db_fast to 1 if you wish to enable faster I/O to the database
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| 50 | # by using optimisations such as PRAGMA journal_mode (MEMORY instead of
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| 51 | # DELETE) and synchronous (OFF instead of FULL)
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| 52 | # Please be aware that in this case it will be less secure and the database
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| 53 | # file may become corrupted if the if the operating system crashes or the
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| 54 | # computer loses power before that data has been written to the disk. But
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| 55 | # the speed gain is about 50x.
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| 56 | $self->{'db_fast'} = 0;
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| 57 | # Set to 1 to enable Write Ahead Logging - which is supposed to allow
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| 58 | # multiple readers/writers on a SQLite database (incompatible with
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| 59 | # db_fast). From SQLite 3.7 onwards, WAL offers limited parallel reader/
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| 60 | # writer support but is limited to single computers (doesn't work over
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| 61 | # networked filesystems). For details see:
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| 62 | # http://www.sqlite.org/draft/wal.html
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| 63 | $self->{'db_wal'} = 0;
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| 64 | # Sanity checking
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| 65 | if ($self->{'db_fast'} && $self->{'db_wal'}) {
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| 66 | print "Warning! Write-Ahead Logging is incompatible with certain SQLite optimizations; db_fast flag will be ignored.\n";
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| 67 | }
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| 68 | # The SQLite path we are using
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| 69 | $self->{'sqlite_executable'} = '';
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| 70 |
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| 71 | # Support
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| 72 | $self->{'supports_set'} = 1;
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| 73 |
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| 74 | bless($self, $class);
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| 75 | return $self;
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| 76 | }
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| 77 |
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| 78 | # -----------------------------------------------------------------------------
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| 79 | # SQLITE IMPLEMENTATION
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| 80 | # -----------------------------------------------------------------------------
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| 81 |
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| 82 | ## Protected
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| 83 |
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| 84 | ## @function _getExecutable
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| 85 | #
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| 86 | sub _getExecutable
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| 87 | {
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| 88 | my $self = shift(@_);
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| 89 | my $sqlite3_exe = $self->{'sqlite_executable'};
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| 90 | if ($sqlite3_exe eq '') {
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| 91 | # Try a full path first - SQLite3 may live in the Greenstone bin
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| 92 | # directory
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| 93 | $sqlite3_exe = &util::filename_cat($ENV{'GSDLHOME'}, 'bin', $ENV{'GSDLOS'}, 'sqlite3' . &util::get_os_exe());
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| 94 | if (!-e "$sqlite3_exe") {
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| 95 | print "Warning! Didn't find SQLite3 on expected path, \"$sqlite3_exe\", let's hope its on the system path.\n";
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| 96 | $sqlite3_exe = 'sqlite3' . &util::get_os_exe();
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| 97 | }
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| 98 | $self->{'sqlite_executable'} = $sqlite3_exe;
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| 99 | }
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| 100 | return $sqlite3_exe;
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| 101 | }
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| 102 | ## _getExecutable() => string ##
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| 103 |
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| 104 |
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| 105 | ## @function _readInfoDBCmd(string, string) => string
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| 106 | #
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| 107 | sub _readInfoDBCmd
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| 108 | {
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| 109 | my $self = shift(@_);
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| 110 | my $infodb_file_path = shift(@_);
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| 111 | my $sqlcmd = shift(@_);
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| 112 | my $result = "";
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| 113 | $self->debugPrint('("' . $infodb_file_path . '", "' . $sqlcmd . '")');
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| 114 | my $sqlite3_exe = $self->_getExecutable();
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| 115 | my $infodb_handle = undef;
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| 116 | my $cmd = "\"$sqlite3_exe\" \"$infodb_file_path\" \"$sqlcmd\"";
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| 117 | if (!open($infodb_handle, "$cmd |")) {
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| 118 | print STDERR "Unable to execute: $cmd\n";
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| 119 | print STDERR "$!\n";
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| 120 | }
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| 121 | else {
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| 122 | binmode($infodb_handle, ":utf8");
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| 123 | my $line;
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| 124 | while (defined($line=<$infodb_handle>)) {
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| 125 | $result .= $line;
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| 126 | }
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| 127 | close($infodb_handle);
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| 128 | }
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| 129 | return $result;
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| 130 | }
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| 131 | ## _readInfoDBCmd(string, string) => string ##
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| 132 |
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| 133 |
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| 134 | ## @function _sqliteSafe(string) => string
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| 135 | #
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| 136 | sub _sqliteSafe
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| 137 | {
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| 138 | my $self = shift(@_);
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| 139 | my $value = shift(@_);
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| 140 | # Escape any single quotes in the value
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| 141 | $value =~ s/\'/\'\'/g;
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| 142 | return $value;
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| 143 | }
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| 144 | ## _sqliteSafe(string) => string ##
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| 145 |
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| 146 |
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| 147 | ## Public
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| 148 |
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| 149 |
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| 150 | # Handled by BaseDBDriver
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| 151 | # sub get_infodb_file_path {}
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| 152 |
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| 153 |
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| 154 | ## @function open_infodb_write_handle(string, string) => handle
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| 155 | #
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| 156 | sub open_infodb_write_handle
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| 157 | {
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| 158 | my $self = shift(@_);
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| 159 | my $infodb_file_path = shift(@_);
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| 160 | my $opt_append = shift(@_);
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| 161 |
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| 162 | if (!defined $opt_append) {
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| 163 | $opt_append = '';
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| 164 | }
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| 165 |
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| 166 | $self->debugPrint('("' . $infodb_file_path . '","' . $opt_append . '")');
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| 167 |
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| 168 | my $sqlite3_exe = $self->_getExecutable();
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| 169 | my $infodb_handle = undef;
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| 170 |
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| 171 | # running sqlite3 with the pragma journal_mode=memory, causes sqlite to
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| 172 | # print out the word "memory". While this is not a problem usually, in our
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| 173 | # case, this ends up going out to the web page first, as part of the web
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| 174 | # page's headers, thus ruining the web page which causes an Internal
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| 175 | # Server Error (500). Therefore, we redirect sqlite's output to the null
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| 176 | # device instead. WAL mode (which also changes the journal) suffers a
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| 177 | # similar issue.
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| 178 | my $nul_device="";
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| 179 | if($self->{'db_fast'} == 1 || $self->{'db_wal'} == 1) {
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| 180 | if($ENV{'GSDLOS'} =~ m/windows/) {
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| 181 | $nul_device=">NUL";
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| 182 | } else {
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| 183 | $nul_device=">/dev/null"; # linux, mac
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| 184 | }
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| 185 | }
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| 186 |
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| 187 | if(!open($infodb_handle, "| \"$sqlite3_exe\" \"$infodb_file_path\"$nul_device"))
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| 188 | {
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| 189 | print STDERR "Error! Failed to open pipe to \"" . $sqlite3_exe . "\" \"" . $infodb_file_path . "\"\n" . $! . "\n";
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| 190 | return undef;
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| 191 | }
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| 192 |
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| 193 | binmode($infodb_handle,":utf8");
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| 194 |
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| 195 | # Allow parallel readers/writers by using a Write Ahead Logger
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| 196 | if ($self->{'db_wal'}) {
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| 197 | print $infodb_handle "PRAGMA journal_mode=WAL;\n";
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| 198 | }
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| 199 | # Add extra optimisations, less secure but with a massive gain in performan-
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| 200 | # ce with large databases which are often updated. They should be set before
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| 201 | # the transaction begins. Incompatible with WAL.
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| 202 | elsif ($self->{'db_fast'}) {
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| 203 | print $infodb_handle "PRAGMA synchronous=OFF;\n";
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| 204 | print $infodb_handle "PRAGMA journal_mode=MEMORY;\n";
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| 205 | }
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| 206 | # If we are *not* appending, drop the table for a fresh start
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| 207 | if ($opt_append ne "append") {
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| 208 | print $infodb_handle "DROP TABLE IF EXISTS data;\n";
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| 209 | print $infodb_handle "DROP TABLE IF EXISTS document_metadata;\n";
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| 210 | }
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| 211 | print $infodb_handle "CREATE TABLE IF NOT EXISTS data (key TEXT PRIMARY KEY, value TEXT);\n";
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| 212 | print $infodb_handle "CREATE TABLE IF NOT EXISTS document_metadata (id INTEGER PRIMARY KEY, docOID TEXT, element TEXT, value TEXT);\n";
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| 213 | # These are crucial for efficiency when importing large amounts of data
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| 214 | print $infodb_handle "CREATE INDEX IF NOT EXISTS dmd ON document_metadata(docOID);\n";
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| 215 | print $infodb_handle "CREATE INDEX IF NOT EXISTS dme ON document_metadata(element);\n";
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| 216 | # This is very important for efficiency, otherwise each command will be act-
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| 217 | # ioned one at a time
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| 218 | print $infodb_handle "BEGIN TRANSACTION;\n";
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| 219 | return $infodb_handle;
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| 220 | }
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| 221 | ## open_infodb_write_handle(string, string) => handle ##
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| 222 |
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| 223 |
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| 224 | ## @function close_infodb_write_handle(handle) => void
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| 225 | #
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| 226 | sub close_infodb_write_handle
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| 227 | {
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| 228 | my $self = shift(@_);
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| 229 | my $infodb_handle = shift(@_);
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| 230 | $self->debugPrint('(<handle>)');
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| 231 | # Close the transaction we began when opening the file
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| 232 | print $infodb_handle "END TRANSACTION;\n";
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| 233 | close($infodb_handle);
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| 234 | }
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| 235 | ## close_infodb_write_handle(handle) => void ##
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| 236 |
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| 237 |
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| 238 | ## @function read_infodb_file(string, hashmap) => void
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| 239 | #
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| 240 | sub read_infodb_file
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| 241 | {
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| 242 | my $self = shift(@_);
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| 243 | my $infodb_file_path = shift(@_);
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| 244 | my $infodb_map = shift(@_);
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| 245 | $self->debugPrint('("' . $infodb_file_path . '", <hashmap>)');
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| 246 | my $keys_str = $self->_readInfoDBCmd($infodb_file_path,"SELECT key FROM data ORDER BY key;");
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| 247 | my @keys = split(/\n/,$keys_str);
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| 248 | foreach my $k (@keys) {
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| 249 | my $k_safe = $self->_sqliteSafe($k);
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| 250 | my $select_val_cmd = "SELECT value FROM data WHERE key='$k_safe';";
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| 251 | my $val_str = $self->_readInfoDBCmd($infodb_file_path,$select_val_cmd);
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| 252 | $infodb_map->{$k} = $val_str;
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| 253 | }
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| 254 | }
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| 255 | ## read_infodb_file(string, hashmap) => void ##
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| 256 |
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| 257 |
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| 258 | ## @function read_infodb_keys(string, hashmap) => void
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| 259 | #
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| 260 | sub read_infodb_keys
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| 261 | {
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| 262 | my $self = shift(@_);
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| 263 | my $infodb_file_path = shift(@_);
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| 264 | my $infodb_map = shift(@_);
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| 265 | $self->debugPrint('("' . $infodb_file_path . '", <hashmap>)');
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| 266 | my $keys_str = $self->_readInfoDBCmd($infodb_file_path,"SELECT key FROM data;");
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| 267 | my @keys = split(/\n/,$keys_str);
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| 268 | foreach my $key (@keys)
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| 269 | {
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| 270 | $infodb_map->{$key} = 1;
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| 271 | }
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| 272 | }
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| 273 | ## read_infodb_keys(string, hashmap) => void ##
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| 274 |
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| 275 |
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| 276 | ## @function read_infodb_rawentry(string, string) => string
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| 277 | #
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| 278 | sub read_infodb_rawentry
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| 279 | {
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| 280 | my $self = shift(@_);
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| 281 | my $infodb_file_path = shift(@_);
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| 282 | my $infodb_key = shift(@_);
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| 283 | $self->debugPrint('("' . $infodb_file_path . '", "' . $infodb_key . '")');
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| 284 | my $key_safe = $self->_sqliteSafe($infodb_key);
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| 285 | my $select_val_cmd = "SELECT value FROM data WHERE key='$key_safe';";
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| 286 | my $val_str = $self->_readInfoDBCmd($infodb_file_path,$select_val_cmd);
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| 287 | return $val_str
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| 288 | }
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| 289 | ## read_infodb_rawentry(string, string) => string ##
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| 290 |
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| 291 |
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| 292 | ## @function read_infodb_entry(string, string) => hashmap
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| 293 | #
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| 294 | sub read_infodb_entry
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| 295 | {
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| 296 | my $self = shift(@_);
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| 297 | my $infodb_file_path = shift(@_);
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| 298 | my $infodb_key = shift(@_);
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| 299 | $self->debugPrint('("' . $infodb_file_path . '", "' . $infodb_key . '")');
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| 300 | my $val_str = $self->read_infodb_rawentry($infodb_file_path,$infodb_key);
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| 301 | my $rec_hash = $self->convert_infodb_string_to_hash($val_str);
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| 302 | return $rec_hash;
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| 303 | }
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| 304 | ## read_infodb_entry(string, string) => hashmap ##
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| 305 |
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| 306 |
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| 307 | ## @function write_infodb_entry(handle, string, hashmap) => void
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| 308 | #
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| 309 | sub write_infodb_entry
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| 310 | {
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| 311 | my $self = shift(@_);
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| 312 | my $infodb_handle = shift(@_);
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| 313 | my $infodb_key = shift(@_);
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| 314 | my $infodb_map = shift(@_);
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| 315 | $self->debugPrint('(<handle>, "' . $infodb_key . '", <hashmap>)');
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| 316 | # Add the key -> value mapping into the "data" table
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| 317 | my $infodb_entry_value = "";
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| 318 | foreach my $infodb_value_key (keys(%$infodb_map)) {
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| 319 | foreach my $infodb_value (@{$infodb_map->{$infodb_value_key}}) {
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| 320 | $infodb_entry_value .= "<$infodb_value_key>" . $infodb_value . "\n";
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| 321 | }
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| 322 | }
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| 323 |
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| 324 | my $safe_infodb_key = $self->_sqliteSafe($infodb_key);
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| 325 | print $infodb_handle "INSERT OR REPLACE INTO data (key, value) VALUES ('" . $safe_infodb_key . "', '" . $self->_sqliteSafe($infodb_entry_value) . "');\n";
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| 326 |
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| 327 | # If this infodb entry is for a document, add all the interesting document
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| 328 | # metadata to the "document_metadata" table (for use by the dynamic
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| 329 | # classifiers)
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| 330 | if ($infodb_key !~ /\./ && $infodb_entry_value =~ /\<doctype\>doc\n/) {
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| 331 | print $infodb_handle "DELETE FROM document_metadata WHERE docOID='" . $safe_infodb_key . "';\n";
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| 332 | foreach my $infodb_value_key (keys(%$infodb_map)) {
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| 333 | # We're not interested in most of the automatically added document metadata
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| 334 | next if ($infodb_value_key eq "archivedir" ||
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| 335 | $infodb_value_key eq "assocfilepath" ||
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| 336 | $infodb_value_key eq "childtype" ||
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| 337 | $infodb_value_key eq "contains" ||
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| 338 | $infodb_value_key eq "docnum" ||
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| 339 | $infodb_value_key eq "doctype" ||
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| 340 | $infodb_value_key eq "Encoding" ||
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| 341 | $infodb_value_key eq "FileSize" ||
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| 342 | $infodb_value_key eq "hascover" ||
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| 343 | $infodb_value_key eq "hastxt" ||
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| 344 | $infodb_value_key eq "lastmodified" ||
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| 345 | $infodb_value_key eq "metadataset" ||
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| 346 | $infodb_value_key eq "thistype" ||
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| 347 | $infodb_value_key =~ /^metadatafreq\-/ ||
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| 348 | $infodb_value_key =~ /^metadatalist\-/);
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| 349 | foreach my $infodb_value (@{$infodb_map->{$infodb_value_key}}) {
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| 350 | print $infodb_handle "INSERT INTO document_metadata (docOID, element, value) VALUES ('" . $safe_infodb_key . "', '" . $self->_sqliteSafe($infodb_value_key) . "', '" . $self->_sqliteSafe($infodb_value) . "');\n";
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| 351 | }
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| 352 | }
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| 353 | }
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| 354 |
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| 355 | #### DEBUGGING
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| 356 | #my $new_file = "D:\\sql.txt";
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| 357 | #open(FOUT, ">>$new_file") or die "Unable to open $new_file for writing out sql statements...ERROR: $!\n";
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| 358 | #print FOUT "BEGIN;\n".$insertStatementsBuffer."\nEND;\n";
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| 359 | #close(FOUT);
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| 360 | #print STDERR $insertStatementsBuffer;
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| 361 | #### END DEBUGGING
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| 362 | }
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| 363 | ## write_infodb_entry(handle, string, hashmap) => void ##
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| 364 |
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| 365 |
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| 366 | ## @function write_infodb_rawentry(handle, string, string) => void
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| 367 | #
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| 368 | sub write_infodb_rawentry
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| 369 | {
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| 370 | my $self = shift(@_);
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| 371 | my $infodb_handle = shift(@_);
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| 372 | my $infodb_key = shift(@_);
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| 373 | my $infodb_val = shift(@_);
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| 374 | $self->debugPrint('(<handle>, "' . $infodb_key . '", "' . $infodb_val . '")');
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| 375 | my $safe_infodb_key = $self->_sqliteSafe($infodb_key);
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| 376 | print $infodb_handle "INSERT OR REPLACE INTO data (key, value) VALUES ('" . $safe_infodb_key . "', '" . $self->_sqliteSafe($infodb_val) . "');\n";
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| 377 | }
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| 378 | ## write_infodb_rawentry(handle, string, string) => void ##
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| 379 |
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| 380 |
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| 381 | ## @function set_infodb_entry(string, string, hashmap) => integer
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| 382 | #
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| 383 | sub set_infodb_entry
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| 384 | {
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| 385 | my $self = shift(@_);
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| 386 | my $infodb_file_path = shift(@_);
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| 387 | my $infodb_key = shift(@_);
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| 388 | my $infodb_map = shift(@_);
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| 389 | $self->debugPrint('("' . $infodb_file_path . '", "' . $infodb_key . '", <hashmap>)');
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| 390 | my $infodb_handle = $self->open_infodb_write_handle($infodb_file_path, "append");
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| 391 | if (!defined $infodb_handle) {
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| 392 | print STDERR "Error: Failed to open infodb write handle\n";
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| 393 | return -1;
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| 394 | }
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| 395 | else {
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| 396 | $self->write_infodb_entry($infodb_handle,$infodb_key,$infodb_map);
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| 397 | $self->close_infodb_write_handle($infodb_handle);
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| 398 | }
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| 399 | # Not currently checking for errors on write to DB
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| 400 | return 0;
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| 401 | }
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| 402 | ## set_infodb_entry(string, string, hashmap) => integer ##
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| 403 |
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| 404 |
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| 405 | ## @function delete_infodb_entry(handle, string) => void
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| 406 | #
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| 407 | sub delete_infodb_entry
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| 408 | {
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| 409 | my $self = shift(@_);
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| 410 | my $infodb_handle = shift(@_);
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| 411 | my $infodb_key = shift(@_);
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| 412 | $self->debugPrint('(<handle>, "' . $infodb_key . '")');
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| 413 | # Delete the key from the "data" table
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| 414 | my $safe_infodb_key = $self->_sqliteSafe($infodb_key);
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| 415 | print $infodb_handle "DELETE FROM data WHERE key='" . $safe_infodb_key . "';\n";
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| 416 | # If this infodb entry is for a document, delete the "document_metadata"
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| 417 | # table entry also (for use by the dynamic classifiers)
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| 418 | if ($infodb_key !~ /\./) {
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| 419 | # Possible for there not to be a docOID matching this infodb_key
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| 420 | # (entries are only made when <doctype> == doc
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| 421 | # Attempt to delete it, and don't complain if one isn't found
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| 422 | print $infodb_handle "DELETE FROM document_metadata WHERE docOID='" . $safe_infodb_key . "';\n";
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| 423 | }
|
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| 424 | }
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| 425 | ## delete_infodb_entry(handle, string) => void ##
|
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| 426 |
|
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| 427 |
|
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| 428 | 1;
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