1 | ###########################################################################
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2 | #
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3 | # GreenstoneXMLPlugout.pm -- the plugout module for Greenstone Archives
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4 | # A component of the Greenstone digital library software
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5 | # from the New Zealand Digital Library Project at the
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6 | # University of Waikato, New Zealand.
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7 | #
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8 | # Copyright (C) 2006 New Zealand Digital Library Project
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9 | #
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10 | # This program is free software; you can redistribute it and/or modify
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11 | # it under the terms of the GNU General Public License as published by
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12 | # the Free Software Foundation; either version 2 of the License, or
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13 | # (at your option) any later version.
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14 | #
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15 | # This program is distributed in the hope that it will be useful,
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16 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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17 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 | # GNU General Public License for more details.
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19 | #
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20 | # You should have received a copy of the GNU General Public License
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21 | # along with this program; if not, write to the Free Software
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22 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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23 | #
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24 | ###########################################################################
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25 |
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26 | package MySQLPlugout;
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27 |
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28 | use strict;
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29 | no strict 'refs';
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30 | no strict 'subs';
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31 |
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32 | use util;
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33 | use FileUtils;
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34 | use GreenstoneXMLPlugout;
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35 | use docprint;
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36 |
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37 | use IPC::Open2;
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38 | use POSIX ":sys_wait_h"; # for waitpid, http://perldoc.perl.org/functions/waitpid.html
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39 |
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40 | # TODO: SIGTERM rollback and disconnect?
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41 |
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42 |
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43 | # this plugout does not output xml to a file, but outputs rows into a mysql table
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44 | sub BEGIN {
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45 | @MySQLPlugout::ISA = ('GreenstoneXMLPlugout');
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46 | }
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47 |
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48 |
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49 | # TODO: deal with -removeold and everything? Or type out instructions for user
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50 |
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51 | # TODO Q: what is "group" in GreenstoneXMLPlugout?
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52 | # TODO Q: site_name only exists for GS3. What about GS2?
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53 |
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54 | my $process_mode_list =
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55 | [ { 'name' => "meta_only",
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56 | 'desc' => "{MySQLPlugout.process_mode.meta_only}" },
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57 | { 'name' => "text_only",
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58 | 'desc' => "{MySQLPlugout.process_mode.text_only}" },
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59 | { 'name' => "all",
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60 | 'desc' => "{MySQLPlugout.process_mode.all}" } ];
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61 |
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62 | my $arguments = [
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63 | { 'name' => "process_mode",
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64 | 'desc' => "{MySQLPlugout.process_mode}",
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65 | 'type' => "enum",
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66 | 'list' => $process_mode_list,
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67 | 'deft' => "all",
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68 | 'reqd' => "no",
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69 | 'hiddengli' => "no"} ];
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70 |
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71 | my $options = { 'name' => "MySQLPlugout",
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72 | 'desc' => "{MySQLPlugout.desc}",
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73 | 'abstract' => "no",
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74 | 'inherits' => "yes",
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75 | 'args' => $arguments };
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76 |
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77 | sub new {
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78 | my ($class) = shift (@_);
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79 | my ($plugoutlist, $inputargs,$hashArgOptLists) = @_;
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80 | push(@$plugoutlist, $class);
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81 |
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82 | push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
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83 | push(@{$hashArgOptLists->{"OptList"}},$options);
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84 |
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85 | my $self = new GreenstoneXMLPlugout($plugoutlist,$inputargs,$hashArgOptLists);
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86 |
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87 | if ($self->{'info_only'}) {
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88 | # don't worry about any options etc
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89 | return bless $self, $class;
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90 | }
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91 | print STDERR "***** MySQLPlugout process mode = \"", $self->{'process_mode'}, "\"\n";
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92 |
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93 | return bless $self, $class;
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94 | }
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95 |
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96 | # connect here and ensure all tables and databases exist
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97 | sub begin {
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98 |
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99 | my $self= shift (@_);
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100 |
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101 | ########### TODO: these should be set from cmdline/GLI options to plugout #########
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102 | $self->{'db_driver'} = "mysql";
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103 | $self->{'site_name'} = "localsite";
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104 | $self->{'db_client_user'} = "root";
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105 | $self->{'db_client_pwd'} = "6reenstone3";
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106 | #$self->{'db_host'} = "127.0.0.1";
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107 | #$self->{'db_encoding'} = "utf8";
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108 | #TODO: proc_mode is also a saveas option
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109 |
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110 | ############ LOAD NECESSARY OPTIONS ###########
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111 | print STDERR "########## COLLECTION: ". $ENV{'GSDLCOLLECTION'}."\n";
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112 | $self->{'collection_name'} = $ENV{'GSDLCOLLECTION'};
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113 |
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114 | if(!$self->connect_to_db()) {
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115 | # This is fatal for the plugout, let's terminate here
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116 | # PrintError would already have displayed the warning message on connection fail
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117 | die("Could not connect to db. Can't proceed.\n");
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118 | }
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119 | if(!$self->load_db_and_tables()) {
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120 | # This is fatal for the plugout, let's terminate here
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121 | # PrintError would already have displayed the warning message on connection fail
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122 | die("Could not use db or prepare its tables. Can't proceed.\n");
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123 | }
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124 |
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125 | # prepare the shared/common HANDLES to SQL insert statements that contain placeholders
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126 | # and which we will reuse repeatedly when actually executing the insert statements
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127 | my $proc_mode = $self->{'process_mode'};
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128 | if($proc_mode eq "all" || $proc_mode eq "meta_only" ) {
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129 | $self->{'metadata_prepared_insert_statement_handle'} = $self->prepare_insert_metadata_row_stmthandle();
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130 | }
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131 | if($proc_mode eq "all" || $proc_mode eq "text_only" ) {
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132 | $self->{'fulltxt_prepared_insert_statement_handle'} = $self->prepare_insert_fulltxt_row_stmthandle();
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133 | }
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134 |
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135 | # if setting up to work with sql db failed, we'd have terminated and wouldn't come up to here:
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136 | # won't bother preparing GreenstoneXMLPlugout by calling superclass' begin()
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137 | # finally, can call begin on super - important as doc.xml is opened as a group etc
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138 |
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139 | if($proc_mode ne "all") { # TODO Q
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140 | $self->GreenstoneXMLPlugout::begin(@_);
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141 | }
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142 | }
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143 |
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144 | # disconnect from database here, see inexport.pm
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145 | sub end
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146 | {
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147 | my $self = shift(@_);
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148 |
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149 | # do the superclass stuff first, as any sql db failures should not prevent superclass cleanup
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150 |
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151 | if($self->{'process_mode'} ne "all") {# TODO Q
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152 | $self->GreenstoneXMLPlugout::end(@_);
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153 | }
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154 |
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155 | $self->disconnect_from_db() || warn("Unable to disconnect from database " . $self->{'site_name'} . "\n"); # disconnect_from_db() will also issue a warning, but this may be clearer
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156 | }
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157 |
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158 | sub close_group_output {
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159 | my $self = shift (@_);
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160 |
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161 | if($self->{'process_mode'} ne "all") { # TODO Q
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162 | $self->GreenstoneXMLPlugout::close_group_output();
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163 | }
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164 | }
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165 |
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166 | # TODO: check arc-inf.db for whether each entry is to be deleted/indexed/reindexed/been indexed
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167 | sub saveas {
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168 | my $self = shift (@_);
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169 | my ($doc_obj, $doc_dir) = @_;
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170 |
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171 | my $proc_mode = $self->{'process_mode'};
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172 |
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173 | # 1. pre save out and saving debug handle
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174 | my ($docxml_outhandler, $output_file);
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175 | if($proc_mode ne "all") { # TODO Q
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176 | ($docxml_outhandler, $output_file) = $self->GreenstoneXMLPlugout::pre_saveas(@_);
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177 |
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178 | $self->{'debug_outhandle'} = $docxml_outhandler if ($self->{'debug'}); # STDOUT if debug
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179 | }
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180 | elsif ($self->{'debug'}) { # if we didn't call superclass::pre_saveas, then set debug handle
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181 | $self->{'debug_outhandle'} = STDOUT; # superclass also debugs to STDOUT
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182 | # TODO: also set debugging in begin()? Then stmts creating db and tables also sent to debug out and not executed
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183 | }
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184 |
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185 |
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186 | # 2. overriding saving behaviour to do what the superclass does PLUS saving to sql db
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187 |
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188 | if($proc_mode ne "all" ) { # if all, then nothing to go into doc.xml, otherwise:
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189 |
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190 | # write the INVERSE into doc.xml as to what is written to the db
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191 |
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192 | my $docxml_output_options = { 'output' => docprint::OUTPUT_NONE }; # TODO Q
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193 |
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194 | if($proc_mode eq "meta_only" ) { # since only meta to go into MySQL db, text will go into docxml
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195 | $docxml_output_options->{'output'} = docprint::OUTPUT_TEXT_ONLY;
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196 | } elsif($proc_mode eq "text_only" ) { # since only full text to go into MySQL db, meta will go into docxml
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197 | $docxml_output_options->{'output'} = docprint::OUTPUT_META_ONLY;
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198 | }
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199 |
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200 | # now we've prepared to write out whatever is meant to go into docxml
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201 | # and can do actual the steps superclass GreenstoneXMLPlugout carries out to write out docxml
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202 | # So: write out the doc xml file for the current document
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203 | my $section_text = &docprint::get_section_xml($doc_obj, $docxml_output_options);
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204 | print $docxml_outhandler $section_text;
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205 | }
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206 |
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207 | # We also write out whatever needs to go into the MySQL database
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208 | $self->write_meta_and_text($doc_obj);
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209 |
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210 |
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211 | # 3. post save out
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212 | if($proc_mode ne "all" ) { # TODO Q
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213 | #$self->GreenstoneXMLPlugout::post_saveas(@_);
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214 | $self->GreenstoneXMLPlugout::post_saveas($doc_obj, $doc_dir, $docxml_outhandler, $output_file);
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215 | }
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216 |
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217 | # database connection is closed in end() method
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218 | # so we don't open and close over and over for each doc during a single build
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219 | }
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220 |
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221 |
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222 | # write meta and/or text PER DOC out to DB
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223 | sub write_meta_and_text {
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224 | my $self = shift (@_);
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225 | my ($doc_obj) = @_;
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226 | my $root_section = $doc_obj->get_top_section();
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227 | my $doc_oid = $doc_obj->get_OID(); # we're processing a single doc at a time, so single OID
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228 |
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229 | # load the prepared INSERT statement handles for both tables (can be undef for any table depending on whether meta_only or txt_only are set)
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230 | my $metadata_table_sth = $self->{'metadata_prepared_insert_statement_handle'};
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231 | my $fulltxt_table_sth = $self->{'fulltxt_prepared_insert_statement_handle'};
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232 |
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233 | $self->recursive_write_meta_and_text($doc_obj, $root_section, $metadata_table_sth, $fulltxt_table_sth);
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234 | }
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235 |
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236 | # Perl: Reading or Writing to Another Program
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237 | # https://nnc3.com/mags/Perl3/cookbook/ch16_05.htm
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238 | sub recursive_write_meta_and_text {
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239 | my $self = shift (@_);
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240 | my ($doc_obj, $doc_oid, $section, $metadata_table_sth, $fulltxt_table_sth) = @_;
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241 |
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242 | # If section=ROOT, write "root" as section name into table
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243 | # doc->get_top_section() is the name of the doc root section, which is ""
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244 | my $section_name = ($section eq "") ? "root" : $section;
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245 |
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246 | my $section_ptr = $doc_obj->_lookup_section ($section);
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247 | return "" unless defined $section_ptr;
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248 |
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249 | my $debug_out = $self->{'debug_outhandle'};
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250 |
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251 | #my $proc_mode = $self->{'process_mode'};
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252 | #if($proc_mode eq "all" || $proc_mode eq "meta_only" ) {
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253 | if($metadata_table_sth) { # meta insert statement handle will be undef if not writing meta
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254 |
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255 | foreach my $data (@{$section_ptr->{'metadata'}}) {
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256 | my $meta_name = $data->[0];
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257 | my $escaped_meta_value = &escape_text($data->[1]);
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258 |
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259 | # Write out the current section's meta to collection db's METADATA table
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260 |
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261 | # for each set of values to write to meta table, execute the prepared statement, filling in the values
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262 |
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263 | if($self->{'debug'}) {
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264 | # just print the statement we were going to execute
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265 |
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266 | print $debug_out $metadata_table_sth->Statement . "($doc_oid, $section_name, $meta_name, $escaped_meta_value)\n";
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267 | }
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268 | else {
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269 |
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270 | $metadata_table_sth->execute($doc_oid, $section_name, $meta_name, $escaped_meta_value);
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271 | #|| warn ("Unable to write metadata row to db:\n\tOID $doc_oid, section $section_name,\n\tmeta name: $meta_name, val: $escaped_meta_value");
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272 | # Execution failure will print out info anyway: since db connection sets PrintError
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273 | }
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274 | }
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275 | }
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276 |
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277 | #if($proc_mode eq "all" || $proc_mode eq "text_only" ) {
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278 | if($fulltxt_table_sth) { # fulltxt insert statement handle will be undef if not writing fulltxt
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279 |
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280 | if($self->{'debug'}) {
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281 | # just print the statement we were going to execute, minus the fulltxt value
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282 | my $txt_repr = $section_ptr->{'text'} ? "<TXT>" : "NULL";
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283 | print $debug_out $fulltxt_table_sth->Statement . "($doc_oid, $section_name, $txt_repr)\n";
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284 | } else {
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285 | my $section_text = &escape_text($section_ptr->{'text'});
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286 |
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287 | # fulltxt column can be SQL NULL. undef value gets written out as NULL:
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288 | # https://stackoverflow.com/questions/12708633/which-one-represents-null-undef-or-empty-string
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289 |
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290 | # Write out the current section's text to collection db's FULLTeXT table
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291 | $fulltxt_table_sth->execute($doc_oid, $section_name, $section_text);
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292 | #|| warn ("Unable to write fulltxt row to db for row:\n\tOID $doc_oid, section $section_name");
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293 | # Execution failure will print out info anyway: since db connection sets PrintError
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294 | }
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295 | }
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296 |
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297 | # output all subsections: RECURSIVE CALL
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298 | foreach my $subsection (@{$section_ptr->{'subsection_order'}}) {
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299 | &recursive_write_meta_and_text($doc_obj, $doc_oid, "$section.$subsection", $metadata_table_sth, $fulltxt_table_sth);
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300 | }
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301 | }
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302 |
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303 | #################################
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304 |
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305 | # Database access related functions
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306 | # http://g2pc1.bu.edu/~qzpeng/manual/MySQL%20Commands.htm
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307 | # https://www.guru99.com/insert-into.html
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308 |
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309 | # TODO Q: What on cancelling a build: delete table? But what if it was a rebuild and the rebuild is cancelled (not the original build)?
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310 | # Do we create a copy of the orig database as backup, then start populating current db, and if cancelled, delete current db and RENAME backup table to current?
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311 | # https://stackoverflow.com/questions/3280006/duplicating-a-mysql-table-indexes-and-data
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312 | # BUT what if the table is HUGE? (Think of a collection with millions of docs.) Huge overhead in copying?
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313 | # The alternative is we just quit on cancel, but then: cancel could leave the table in a partial committed state, with no way of rolling back.
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314 | # Unless they do a full rebuild, which will recreate the table from scratch?
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315 | # SOLUTION-> rollback transaction on error, see https://www.effectiveperlprogramming.com/2010/07/set-custom-dbi-error-handlers/
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316 | # But then should set AutoCommit to off on connection, and remember to commit every time
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317 |
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318 | #################
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319 | # Database functions that use the perl DBI module (with the DBD driver module for mysql)
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320 | #################
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321 |
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322 | # THE NEW DB FUNCTIONS
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323 | # NOTE: FULLTEXT is a reserved keyword in (My)SQL. So we can't name a table or any of its columns "fulltext".
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324 | # https://dev.mysql.com/doc/refman/5.5/en/keywords.html
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325 |
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326 | # TODO: Consider AutoCommit status (and Autocommit off allowing commit or rollback for GS coll build cancel) later
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327 |
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328 | sub connect_to_db {
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329 | my $self= shift (@_);
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330 |
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331 | my $db_driver = $self->{'db_driver'};
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332 | my $db_user = $self->{'db_client_user'} || "root";
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333 | my $db_pwd = $self->{'db_client_pwd'};
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334 | my $db_host = $self->{'db_host'} || "127.0.0.1";
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335 | my $db_enc = $self->{'db_encoding'} || "utf8";
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336 |
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337 | #my $db_name = $self->{'site_name'};
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338 |
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339 | # try connecting to the mysql db, if that fails it will die
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340 | # so don't bother preparing GreenstoneXMLPlugout by calling superclass' begin()
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341 |
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342 | # localhost doesn't work for us, but 127.0.0.1 works
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343 | # https://metacpan.org/pod/DBD::mysql
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344 | # "The hostname, if not specified or specified as '' or 'localhost', will default to a MySQL server
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345 | # running on the local machine using the default for the UNIX socket. To connect to a MySQL server
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346 | # on the local machine via TCP, you must specify the loopback IP address (127.0.0.1) as the host."
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347 | #my $connect_str = "dbi:$db_driver:database=$db_name;host=$db_host";
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348 | my $connect_str = "dbi:$db_driver:host=$db_host"; # don't provide db, so we can check the db is there
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349 | my $dbh = DBI->connect("$connect_str", $db_user, $db_pwd,
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350 | {
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351 | ShowErrorStatement => 1, # more informative as DBI will append failed SQL stmt to error message
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352 | PrintError => 1, # on by default, but being explicit
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353 | RaiseError => 0, # off by default, but being explicit
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354 | AutoCommit => 1, # on by default, but being explicit
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355 | });
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356 |
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357 | if(!$dbh) {
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358 | # NOTE, despite handle dbh being undefined, error code will be in DBI->err
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359 | return 0;
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360 | }
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361 |
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362 | # set encoding https://metacpan.org/pod/DBD::mysql
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363 | # https://dev.mysql.com/doc/refman/5.7/en/charset.html
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364 | # https://dev.mysql.com/doc/refman/5.7/en/charset-conversion.html
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365 | # Setting the encoding at db server level.
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366 | # Not sure if this command is mysql specific:
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367 | my $stmt = "set NAMES '" . $db_enc . "'";
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368 | $dbh->do($stmt) || warn("Unable to set charset encoding at db server level to: " . $db_enc . "\n");
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369 |
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370 | # if we're here, then connection succeeded, store handle
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371 | $self->{'db_handle'} = $dbh;
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372 | return 1;
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373 | }
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374 |
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375 | sub load_db_and_tables {
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376 | my $self= shift (@_);
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377 | my $db_name = $self->{'site_name'}; # one database per GS3 site
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378 | my $dbh = $self->{'db_handle'};
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379 |
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380 | # perl DBI switch database: https://www.perlmonks.org/?node_id=995434
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381 | # do() returns undef on error.
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382 | # connection succeeded, try to load our database. If that didn't work, attempt to create db
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383 | my $success = $dbh->do("use $db_name");
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384 |
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385 | if(!$success && $dbh->err == 1049) { # "Unknown database" error has code 1049 (mysql only?) meaning db doesn't exist yet
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386 | # attempt to create the db and its tables
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387 | $self->create_db($db_name) || return 0;
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388 |
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389 | # once more attempt to use db, now that it exists
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390 | $dbh->do("use $db_name") || return 0;
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391 | #$dbh->do("use localsite") or die "Error (code" . $dbh->err ."): " . $dbh->errstr . "\n";
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392 |
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393 | # attempt to create tables in current db
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394 | $self->create_metadata_table() || return 0;
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395 | $self->create_fulltext_table() || return 0;
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396 |
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397 | $success = 1;
|
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398 | }
|
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399 | elsif($success) { # database existed and loaded successfully, but
|
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400 | # before proceeding check that the current collection's tables exist
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401 |
|
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402 | # attempt to create tables in current db
|
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403 | if(!$self->table_exists($self->{'collection_name'} . "metadata")) {
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404 | $self->create_metadata_table() || return 0;
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405 | }
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406 | if(!$self->table_exists($self->{'collection_name'} . "fulltxt")) {
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407 | $self->create_fulltext_table() || return 0;
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408 | }
|
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409 | }
|
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410 |
|
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411 | return $success; # could still return 0, if database failed to load with an error code != 1049
|
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412 | }
|
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413 |
|
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414 | # disconnect from db - https://metacpan.org/pod/DBI#disconnect
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415 | # TODO: make sure to have committed or rolled back before disconnect
|
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416 | # and that you've call finish() on statement handles if any fetch remnants remain
|
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417 | sub disconnect_from_db {
|
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418 | my $self= shift (@_);
|
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419 | my $dbh = $self->{'db_handle'};
|
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420 |
|
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421 | # make sure any active stmt handles are finished
|
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422 | # NO: "When all the data has been fetched from a SELECT statement, the driver will automatically call finish for you. So you should not call it explicitly except when you know that you've not fetched all the data from a statement handle and the handle won't be destroyed soon."
|
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423 |
|
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424 | #$meta_sth = $self->{'metadata_prepared_insert_statement_handle'};
|
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425 | #$txt_sth = $self->{'fulltxt_prepared_insert_statement_handle'};
|
---|
426 | #$meta_sth->finish() if($meta_sth);
|
---|
427 | #$txt_sth->finish() if($txt_sth);
|
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428 |
|
---|
429 | my $rc = $dbh->disconnect or warn $dbh->errstr; # The handle is of little use after disconnecting. Possibly PrintError already prints a warning and this duplicates it?
|
---|
430 | return $rc;
|
---|
431 | }
|
---|
432 |
|
---|
433 | sub create_db {
|
---|
434 | my $self= shift (@_);
|
---|
435 | my $db_name = $self->{'site_name'};
|
---|
436 | my $dbh = $self->{'db_handle'};
|
---|
437 |
|
---|
438 | # https://stackoverflow.com/questions/5025768/how-can-i-create-a-mysql-database-from-a-perl-script
|
---|
439 | return $dbh->do("create database $db_name"); # do() will return undef on fail, https://metacpan.org/pod/DBI#do
|
---|
440 | }
|
---|
441 |
|
---|
442 | sub create_metadata_table {
|
---|
443 | my $self= shift (@_);
|
---|
444 | my $dbh = $self->{'db_handle'};
|
---|
445 |
|
---|
446 | my $table_name = $self->{'collection_name'} . "metadata";
|
---|
447 |
|
---|
448 | # If using an auto incremented primary key:
|
---|
449 | my $stmt = "CREATE TABLE $table_name (id INT NOT NULL AUTO_INCREMENT, did VARCHAR(63) NOT NULL, sid VARCHAR(63) NOT NULL, metaname VARCHAR(127) NOT NULL, metavalue VARCHAR(1023) NOT NULL, PRIMARY KEY(id));";
|
---|
450 | return $dbh->do($stmt);
|
---|
451 | }
|
---|
452 |
|
---|
453 | # TODO: Investigate: https://dev.mysql.com/doc/search/?d=10&p=1&q=FULLTEXT
|
---|
454 | # 12.9.1 Natural Language Full-Text Searches
|
---|
455 | # to see whether we have to index the 'fulltxt' column of the 'fulltext' tables
|
---|
456 | # or let user edit this file, or add it as another option
|
---|
457 | sub create_fulltext_table {
|
---|
458 | my $self= shift (@_);
|
---|
459 | my $dbh = $self->{'db_handle'};
|
---|
460 |
|
---|
461 | my $table_name = $self->{'collection_name'} . "fulltxt";
|
---|
462 |
|
---|
463 | # If using an auto incremented primary key:
|
---|
464 | my $stmt = "CREATE TABLE $table_name (id INT NOT NULL AUTO_INCREMENT, did VARCHAR(63) NOT NULL, sid VARCHAR(63) NOT NULL, fulltxt LONGTEXT, PRIMARY KEY(id));";
|
---|
465 | return $dbh->do($stmt);
|
---|
466 |
|
---|
467 | }
|
---|
468 |
|
---|
469 |
|
---|
470 | # USEFUL: https://metacpan.org/pod/DBI
|
---|
471 | # "Many methods have an optional \%attr parameter which can be used to pass information to the driver implementing the method. Except where specifically documented, the \%attr parameter can only be used to pass driver specific hints. In general, you can ignore \%attr parameters or pass it as undef."
|
---|
472 |
|
---|
473 |
|
---|
474 | # https://www.guru99.com/insert-into.html
|
---|
475 | # and https://dev.mysql.com/doc/refman/8.0/en/example-auto-increment.html
|
---|
476 | # for inserting multiple rows at once
|
---|
477 | # https://www.perlmonks.org/bare/?node_id=316183
|
---|
478 | # https://metacpan.org/pod/DBI#do
|
---|
479 | # https://www.quora.com/What-is-the-difference-between-prepare-and-do-statements-in-Perl-while-we-make-a-connection-to-the-database-for-executing-the-query
|
---|
480 | # https://docstore.mik.ua/orelly/linux/dbi/ch05_05.htm
|
---|
481 |
|
---|
482 | # https://metacpan.org/pod/DBI#performance
|
---|
483 | # 'The q{...} style quoting used in this example avoids clashing with quotes that may be used in the SQL statement. Use the double-quote like qq{...} operator if you want to interpolate variables into the string. See "Quote and Quote-like Operators" in perlop for more details.'
|
---|
484 | sub prepare_insert_metadata_row_stmthandle {
|
---|
485 | my $self = shift (@_);
|
---|
486 | my ($did, $sid, $metaname, $metavalue) = @_;
|
---|
487 | my $dbh = $self->{'db_handle'};
|
---|
488 |
|
---|
489 | my $tablename = $self->{'colname'}."_metadata";
|
---|
490 |
|
---|
491 | #my $stmt = "INSERT INTO $tablename (did, sid, metaname, metavalue) VALUES ('$did', '$sid', '$metaname', '$metavalue');"; # ?, ?, ?, ?
|
---|
492 |
|
---|
493 | # using qq{} since we want $tablename placeholder to be filled in
|
---|
494 | # returns Statement Handle object!
|
---|
495 | my $sth = $dbh->prepare(qq{INSERT INTO $tablename (did, sid, metaname, metavalue) VALUES (?, ?, ?, ?)"}) || warn("Could not prepare insert statement for metadata table\n");
|
---|
496 |
|
---|
497 | return $sth;
|
---|
498 | }
|
---|
499 |
|
---|
500 | sub prepare_insert_fulltxt_row_stmthandle {
|
---|
501 | my $self = shift (@_);
|
---|
502 | my ($did, $sid, $fulltext) = @_;
|
---|
503 | my $dbh = $self->{'db_handle'};
|
---|
504 |
|
---|
505 | my $tablename = $self->{'colname'}."_fulltxt";
|
---|
506 |
|
---|
507 | #my $stmt = "INSERT INTO $tablename (did, sid, fulltxt) VALUES ('$did', '$sid', '$fulltext');"; ?, ?, ?
|
---|
508 |
|
---|
509 | # using qq{} since we want $tablename placeholder to be filled in
|
---|
510 | # returns Statement Handle object!
|
---|
511 | my $sth = $dbh->prepare(qq{INSERT INTO $tablename (did, sid, fulltxt) VALUES (?, ?, ?)"}) || warn("Could not prepare insert statement for fulltxt table\n");
|
---|
512 |
|
---|
513 | return $sth;
|
---|
514 | }
|
---|
515 |
|
---|
516 | # I can get my version of table_exists to work, but it's not so ideal
|
---|
517 | # Interesting that MySQL has non-standard command to CREATE TABLE IF NOT EXISTS and DROP TABLE IF EXISTS,
|
---|
518 | # see https://www.perlmonks.org/bare/?node=DBI%20Recipes
|
---|
519 | # The page further has a table_exists function that could work with proper comparison
|
---|
520 | # Couldn't get the first solution at https://www.perlmonks.org/bare/?node_id=500050 to work though
|
---|
521 | sub table_exists {
|
---|
522 | my ($dbh,$table_name) = @_;
|
---|
523 |
|
---|
524 | my @table_list = $dbh->tables;
|
---|
525 | #my $tables_str = @table_list[0];
|
---|
526 | foreach my $table (@table_list) {
|
---|
527 | return 1 if ($table =~ m/$table_name/);
|
---|
528 | }
|
---|
529 | return 0;
|
---|
530 | }
|
---|
531 |
|
---|
532 | 1;
|
---|