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Catalog_search_mysql.php
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Catalog_search_mysql.php
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<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
* Data Catalog Search Class for MYSQL FULLTEXT Database
*
*
*
* @category Data Catalog Search
* @link -
*
*/
class Catalog_search_mysql{
var $ci;
var $errors=array();
//search fields
var $study_keywords='';
var $variable_keywords='';
var $variable_fields=array();
var $topics=array();
var $tags=array();
var $countries=array();
var $regions=array();
var $from=0;
var $to=0;
var $repo='';
var $type=array();
var $data_class=array();
var $collections=array();
var $dtype=array();//data access type
var $sid=''; //comma separated list of survey IDs
var $country_iso3=''; //comma seperated list country iso3 codes
var $created='';
var $params;
//allowed variable search fields
var $variable_allowed_fields=array('labl','name','qstn','catgry');
//allowed sort options
var $sort_allowed_fields=array(
'rank'=>'rank_',
'title'=>'title',
'country'=>'nation',
'nation'=>'nation',
'year'=>'year_start',
'proddate'=>'year_start',
'popularity'=>'total_views',
'total_views'=>'total_views',
'created'=>'created',
'changed'=>'changed'
);
var $sort_allowed_order=array('asc','desc');
//default sort
var $sort_by='title';
var $sort_order='ASC';
/**
* Constructor
*
* @access public
* @param array initialization parameters
*/
function __construct($params = array())
{
$this->ci=& get_instance();
$this->ci->load->config('noise_words');
$this->ci->load->model("Facet_model");
$this->user_facets=$this->ci->Facet_model->select_all('user');
//change default sort if regional search is ON
if ($this->ci->config->item("regional_search")=='yes')
{
$this->sort_by='nation';
}
if (count($params) > 0)
{
$this->initialize($params);
}
log_message('debug', "Catalog_search Class Initialized");
//$this->ci->output->enable_profiler(TRUE);
$this->params=$params;
}
function initialize($params=array())
{
if (count($params) > 0)
{
foreach ($params as $key => $val)
{
if (isset($this->$key))
{
$this->$key = $val;
}
}
}
}
//perform the search
public function search($limit=15, $offset=0)
{
$type=$this->_build_dataset_type_query();
$study=$this->_build_study_query();
$variable=false;//$this->_build_variable_query();
$topics=$this->_build_topics_query();
$countries=$this->_build_countries_query();
$regions=$this->_build_regions_query();
$tags=$this->_build_tags_query();
$collections=$this->_build_collections_query();
$years=$this->_build_years_query();
$repository=$this->_build_repository_query();
$dtype=$this->_build_dtype_query();
$data_classification=$this->_build_data_classification_query();
$sid=$this->_build_sid_query();
$created=$this->_build_created_query();
$countries_iso3=$this->_build_countries_iso3_query();
$sort_order=in_array($this->sort_order,$this->sort_allowed_order) ? $this->sort_order : 'ASC';
$sort_by=array_key_exists($this->sort_by,$this->sort_allowed_fields) ? $this->sort_by : 'title';
$sort_by='title';
if (array_key_exists($this->sort_by,$this->sort_allowed_fields))
{
$sort_by=$this->sort_allowed_fields[$this->sort_by];
}
else
{
if ($this->ci->config->item("regional_search")=='yes')
{
$sort_by='nation';
}
}
if(empty($study) && $sort_by=='rank_'){
$sort_by='title';
}
$sort_options[0]=array('sort_by'=>$sort_by, 'sort_order'=>$sort_order);
//multi-column sort
if ($sort_by=='nation')
{
$sort_options[1]=array('sort_by'=>'year_start', 'sort_order'=>'desc');
$sort_options[2]=array('sort_by'=>'title', 'sort_order'=>'asc');
$sort_options[3]=array('sort_by'=>'total_views', 'sort_order'=>'desc');
}
elseif ($sort_by=='title')
{
$sort_options[1]=array('sort_by'=>'year_start', 'sort_order'=>'desc');
$sort_options[2]=array('sort_by'=>'nation', 'sort_order'=>'asc');
$sort_options[3]=array('sort_by'=>'total_views', 'sort_order'=>'desc');
}
if ($sort_by=='year_start')
{
$sort_options[2]=array('sort_by'=>'nation', 'sort_order'=>'asc');
$sort_options[2]=array('sort_by'=>'title', 'sort_order'=>'asc');
$sort_options[3]=array('sort_by'=>'total_views', 'sort_order'=>'desc');
}
//array of all options
$where_list=array($study,$variable,$topics,$countries,$years,$repository,$collections,$dtype,$sid,$countries_iso3,$created,$data_classification,$tags,$type,$regions);
foreach($this->user_facets as $fc){
if (array_key_exists($fc['name'],$this->params)){
$facet_query=$this->_build_facet_query($fc['name'],$this->params[$fc['name']]);
if($facet_query){
$where_list[]=$facet_query;
}
}
}
//create combined where clause
$where='';
foreach($where_list as $stmt)
{
if ($where=='')
{
$where=$stmt;
}
else
{
if ($stmt!==FALSE) {
$where.="\r\n".' AND '. $stmt;
}
}
}
//study fields returned by the select statement
$study_fields='surveys.id as id, surveys.type, surveys.idno as idno,surveys.title,surveys.subtitle,nation,authoring_entity';
$study_fields.=',forms.model as form_model, data_class_id, surveys.year_start,surveys.year_end, surveys.thumbnail';
$study_fields.=',surveys.repositoryid as repositoryid, link_da, repositories.title as repo_title, surveys.created,surveys.changed,surveys.total_views,surveys.total_downloads,varcount';
//add ranking if keywords are not empty
if(!empty($study)){
$study_fields.=', '.$study. ' as rank_';
}
//build final search sql query
$sql='';
if ($variable!==FALSE)
{
//variable search
$this->ci->db->select('SQL_CALC_FOUND_ROWS '.$study_fields.',varcount, count(*) as var_found',FALSE);
$this->ci->db->from('surveys');
$this->ci->db->join('forms','surveys.formid=forms.formid','left');
$this->ci->db->join('variables v','surveys.id=v.sid','inner');
$this->ci->db->join('repositories','surveys.repositoryid=repositories.repositoryid','left');
$this->ci->db->where('surveys.published',1);
if ($repository!='')
{
$this->ci->db->join('survey_repos','surveys.id=survey_repos.sid','left');
}
$this->ci->db->group_by('id,idno,title,nation');
//multi-sort
foreach($sort_options as $sort)
{
$this->ci->db->order_by($sort['sort_by'],$sort['sort_order']);
}
$this->ci->db->limit($limit,$offset);
if ($where!='') {
$this->ci->db->where($where);
}
$query=$this->ci->db->get();
}
else
{
//study search
$this->ci->db->select("SQL_CALC_FOUND_ROWS $study_fields ",FALSE);
$this->ci->db->from('surveys');
$this->ci->db->join('forms','surveys.formid=forms.formid','left');
$this->ci->db->join('repositories','surveys.repositoryid=repositories.repositoryid','left');
$this->ci->db->where('surveys.published',1);
if ($repository!=''){
$this->ci->db->join('survey_repos','surveys.id=survey_repos.sid','left');
}
//multi-sort
foreach($sort_options as $sort)
{
$this->ci->db->order_by($sort['sort_by'],$sort['sort_order']);
}
$this->ci->db->limit($limit,$offset);
if ($where!='') {
$this->ci->db->where($where,FALSE,FALSE);
}
$query=$this->ci->db->get();
}
if ($query){
//result to array
$this->search_result=$query->result_array();
}
else{
//some error occured
return FALSE;
}
//get total search result count
$query_found_rows=$this->ci->db->query('select FOUND_ROWS() as rowcount',FALSE)->row_array();
$this->search_found_rows=$query_found_rows['rowcount'];
//get total surveys in db
$this->ci->db->select('count(*) as rowcount');
$this->ci->db->where('published',1);
if($repository!=''){
$this->ci->db->join('survey_repos','surveys.id=survey_repos.sid','inner');
$this->ci->db->where($repository);
}
$query_total_surveys=$this->ci->db->get('surveys')->row_array();
$this->total_surveys=$query_total_surveys['rowcount'];
//combine into one array
$result['found']=$this->search_found_rows;
$result['total']=$this->total_surveys;
$result['limit']=$limit;
$result['offset']=$offset;
$result['rows']=$this->search_result;
$result['citations']=$this->get_survey_citation();
//$result['search_counts_by_type']=null;
$result['search_counts_by_type']=$this->search_counts_by_type();
if ($result['found']>0){
//search for variables for SURVEY types
$id_list=array_column($this->search_result, "id");
if(count($id_list)>0){
//search variables and get the counts
$variables_by_study=$this->search_variable_counts($id_list,$this->study_keywords);
if(!empty($variables_by_study)){
foreach($this->search_result as $idx=>$row)
{
if(array_key_exists($row['id'],$variables_by_study)){
$this->search_result[$idx]['var_found']=$variables_by_study[$row['id']]['var_found'];
}
}
}
}
$result['rows']=$this->search_result;
}
return $result;
}
/**
*
* Get search counts by dataset type
*
*/
public function search_counts_by_type()
{
$type=false;//$this->_build_dataset_type_query();
$study=$this->_build_study_query();
$variable=false;//$this->_build_variable_query();
$topics=$this->_build_topics_query();
$countries=$this->_build_countries_query();
$regions=$this->_build_regions_query();
$tags=$this->_build_tags_query();
$collections=$this->_build_collections_query();
$years=$this->_build_years_query();
$repository=$this->_build_repository_query();
$dtype=$this->_build_dtype_query();
$data_classification=$this->_build_data_classification_query();
$sid=$this->_build_sid_query();
$countries_iso3=$this->_build_countries_iso3_query();
//array of all options
$where_list=array($tags,$study,$variable,$topics,$countries,$years,$repository,$collections,$dtype,$data_classification,$sid,$countries_iso3,$regions,$type);
foreach($this->user_facets as $fc){
if (array_key_exists($fc['name'],$this->params)){
$facet_query=$this->_build_facet_query($fc['name'],$this->params[$fc['name']]);
if($facet_query){
$where_list[]=$facet_query;
}
}
}
//create combined where clause
$where='';
foreach($where_list as $stmt)
{
if ($where=='')
{
$where=$stmt;
}
else
{
if ($stmt!==FALSE) {
$where.="\r\n".' AND '. $stmt;
}
}
}
//study fields returned by the select statement
$study_fields='surveys.id as id, surveys.type, surveys.idno as idno,surveys.title,surveys.subtitle,nation,authoring_entity,forms.model as form_model,data_class_id,surveys.year_start,surveys.year_end';
$study_fields.=', surveys.repositoryid as repositoryid, link_da, repositories.title as repo_title, surveys.created,surveys.changed,surveys.total_views,surveys.total_downloads';
//build final search sql query
$sql='';
//study search
$this->ci->db->select("surveys.type, count(surveys.type) as total",FALSE);
$this->ci->db->from('surveys');
$this->ci->db->join('forms','surveys.formid=forms.formid','left');
$this->ci->db->join('repositories','surveys.repositoryid=repositories.repositoryid','left');
$this->ci->db->where('surveys.published',1);
$this->ci->db->group_by('surveys.type');
if ($repository!=''){
$this->ci->db->join('survey_repos','surveys.id=survey_repos.sid','left');
}
if ($where!='') {
$this->ci->db->where($where,FALSE,FALSE);
}
$query=$this->ci->db->get();
$output=array();
if ($query){
$query=$query->result_array();
foreach($query as $row){
$output[$row['type']]=$row['total'];
}
}
else{
//some error occured
return FALSE;
}
return $output;
}
/**
*
*
* Parse mysql fulltext search keywords
*
*/
function parse_fulltext_keywords($keywords){
//remove fulltext operators
$text = preg_replace('/[+><\(\)~\"@]+/', ' ', $keywords);
$text = preg_replace('/[-]+/', '-', $text);
$text = preg_replace('/[*]+/', '*', $text);
#remove noise words
$noise_words=(array)$this->ci->config->item("noise_words");
$text= explode(" ",$text);
$words=array_diff($text,$noise_words);
//$text=str_replace('++','',$text);
//$text=str_replace('--','',$text);
$prefixes=array(
'-',
'+'
);
//$words=explode(" ", $text);
$output=array();
foreach($words as $word){
$word=$this->quote_keyword($word);
$prefix=substr($word,0,1);
//has prefix?
if(in_array($prefix,$prefixes) && strlen(trim($word))>3){
$output[]=$word;
}else{
//add prefix for 3 letter keywords
if(strlen($word)==3){
if(isset($this->ci->db->prefix_short_words) && $this->ci->db->prefix_short_words==true){
$word='_'.$word;
}
}
if (strlen($word)>2){
$output[]='+'.$word;//default AND
}
}
}
return implode("",$output);
}
function quote_keyword($keyword)
{
$keyword=trim($keyword);
if (strlen(trim($keyword))<3){
return $keyword;
}
$prefixes=array(
'-',
'+'
);
$prefix=substr($keyword,0,1);
if(!in_array($prefix,$prefixes)){
$prefix='';
}
//check keyword includes dashes?
if (strpos($keyword, '-') !== false || strpos($keyword, '.') !== false){
$keyword='"'.$keyword.'"';
}
return $prefix.$keyword;
}
/**
* Build study search
*/
protected function _build_study_query()
{
$study_keywords=$this->study_keywords;
$study_keywords=str_replace(array('"',"'"), '',$study_keywords);
if(strlen($study_keywords)<3 || strlen($study_keywords)>100){
return false;
}
//fulltext index name
$study_fulltext_index='keywords, var_keywords';
$keywords=explode(" ",$study_keywords);
$study_keywords=$this->parse_fulltext_keywords($study_keywords);
if(count($keywords)==1){//search for keywords + idno
$sql=sprintf('( MATCH(%s) AGAINST(%s IN BOOLEAN MODE) or idno=%s)',$study_fulltext_index,$this->ci->db->escape($study_keywords), $this->ci->db->escape($this->study_keywords));
}else{
$sql=sprintf('( MATCH(%s) AGAINST(%s IN BOOLEAN MODE))',$study_fulltext_index,$this->ci->db->escape($study_keywords));
}
return $sql;
}
protected function _build_variable_query()
{
$variable_keywords=trim($this->study_keywords);
$variable_keywords=str_replace(array('"',"'"), '',$variable_keywords);
if(strlen($variable_keywords)<3 || strlen($variable_keywords)>100){
return false;
}
$variable_keywords=$this->parse_fulltext_keywords($variable_keywords);
//cleaned list of variable fields array
$variable_fields=$this->variable_fields();
$tmp_where=array();
if (strlen($variable_keywords) >3){
//get fulltext index name
$fulltext_index=$this->get_variable_search_field(TRUE);
//FULLTEXT
$tmp_where[]=sprintf('MATCH(%s) AGAINST (%s IN BOOLEAN MODE)','v.'.$fulltext_index,$this->ci->db->escape($variable_keywords));
}
if (!empty($tmp_where)){
return '('.implode(' OR ',$tmp_where).')';
}
return FALSE;
}
protected function _build_facet_query($facet_name,$values)
{
if (empty($values)){
return false;
}
$values=(array)$values;
foreach($values as $idx=>$value){
if(!empty($value)){
$values[$idx]=$this->ci->db->escape($value);
}
}
$values= implode(',',$values);
if ($values!=''){
return sprintf('surveys.id in (select sid from survey_facets where term_id in (%s))',$values);
}
return FALSE;
}
/**
*
* build where for topics
*/
protected function _build_topics_query()
{
$topics=$this->topics;//must always be an array
if (!is_array($topics))
{
return FALSE;
}
//remove topics that are not numeric
$topics_clean=array();
foreach($topics as $topic)
{
if (is_numeric($topic) )
{
$topics_clean[]=$topic;
}
}
if ( count($topics_clean)>0)
{
$topics=implode(',',$topics_clean);
}
else
{
return FALSE;
}
//topics
if ($topics!='')
{
return sprintf('surveys.id in (select sid from survey_topics where tid in (%s) )',$topics);
}
return FALSE;
}
//returns country IDs by country names
function get_country_id_by_name($country_names=array())
{
$this->ci->db->select("countryid");
$this->ci->db->where_in('name',$country_names);
$query= $this->ci->db->get('countries')->result_array();
if (!$query)
{
return array();
}
$output=NULL;
foreach($query as $country)
{
$output[]=$country['countryid'];
}
return $output;
}
protected function _build_dataset_type_query()
{
$types=(array)$this->type;//must always be an array
if (!is_array($types)){
return FALSE;
}
$types_list=array();
foreach($types as $type){
if(!empty($type)){
$types_list[]=$this->ci->db->escape($type);
}
}
$types= implode(',',$types_list);
if ($types!=''){
return sprintf('(surveys.type in (%s))',$types);
}
return FALSE;
}
protected function _build_tags_query()
{
$tags=(array)$this->tags;//must always be an array
if (!is_array($tags)){
return FALSE;
}
$tags_list=array();
foreach($tags as $tag){
if(!empty($tag)){
$tags_list[]=$this->ci->db->escape($tag);
}
}
$tags= implode(',',$tags_list);
if ($tags!=''){
return sprintf('surveys.id in (select sid from survey_tags where tag in (%s))',$tags);
}
return FALSE;
}
/**
*
* build where for nations
*/
protected function _build_countries_query()
{
$countries=$this->countries;//must always be an array
if (!is_array($countries))
{
return FALSE;
}
$countries_list=array();
//check if country[] param contains the country name instead of country id
if (isset($countries[0]) && !is_numeric($countries[0]))
{
//get country id by name
$countries=$this->get_country_id_by_name($countries);
}
foreach($countries as $country)
{
//escape country names for db
$countries_list[]=(int)$country;
}
if ( count($countries_list)>0)
{
$countries= implode(',',$countries_list);
}
else
{
return FALSE;
}
if ($countries!='')
{
return sprintf('surveys.id in (select sid from survey_countries where cid in (%s))',$countries);
}
return FALSE;
}
/**
*
* build where for regions
*/
protected function _build_regions_query()
{
$regions=$this->regions;//must always be an array
if (!is_array($regions)){
return FALSE;
}
if ( !count($regions)>0){
return false;
}
foreach($regions as $idx=>$region){
if(!is_numeric($region)){
unset($regions[$idx]);
}
}
$regions= implode(',',$regions);
if ($regions!=''){
//return sprintf('surveys.id in (select sid from survey_countries where cid in (%s))',$regions);
return sprintf('surveys.id in (select sid from region_countries
inner join survey_countries on region_countries.country_id=survey_countries.cid
where region_countries.region_id in (%s))',$regions);
}
return FALSE;
}
/**
*
* build where countries by iso3 code
*/
protected function _build_countries_iso3_query()
{
if (trim($this->country_iso3)=="")
{
return FALSE;
}
$countries=explode(",",$this->country_iso3);
if (!is_array($countries))
{
return FALSE;
}
$countries_list=array();
foreach($countries as $country_code)
{
if (strlen(trim($country_code))==3) {
//escape country names for db
$countries_list[] = $this->ci->db->escape($country_code);
}
}
if ( count($countries_list)>0)
{
$countries= implode(',',$countries_list);
}
else
{
return FALSE;
}
if ($countries!='')
{
return sprintf('surveys.id in (select survey_countries.sid from countries
inner join survey_countries on countries.countryid=survey_countries.cid where countries.iso in (%s))',$countries);
}
return FALSE;
}
protected function _build_years_query()
{
$from=(integer)$this->from;
$to=(integer)$this->to;
if ($from==0 && $to>0){
return sprintf('surveys.id in (select sid from survey_years where (data_coll_year <= %s) or (data_coll_year=0) )',$to);
}
if ($from>0 && $to==0){
return sprintf('surveys.id in (select sid from survey_years where (data_coll_year >= %s) or (data_coll_year=0) )',$from);
}
if ($from>0 && $to>0){
return sprintf('surveys.id in (select sid from survey_years where (data_coll_year between %s and %s) or (data_coll_year=0) )',$from, $to);
}
return FALSE;
}
protected function _build_sid_query()
{
$sid=explode(",",$this->sid);
$sid_list=array();
foreach($sid as $item)
{
if (is_numeric($item))
{
$sid_list[]=$item;
}
}
if (count($sid_list)>0)
{
return sprintf('surveys.id in (%s)',implode(",",$sid_list));
}
return FALSE;
}
protected function _build_created_query()
{
$created_range=explode("-",$this->created);
if(empty($created_range)){
return false;
}
$created_start=strtotime($created_range[0]);
if (empty($created_start)){
return false;
}
if (isset($created_range[1]) && strtotime($created_range[1])){
$created_end= + strtotime($created_range[1]) + 86399;
}
else{
$created_end= $created_start + 86399;
}
$query=null;
$query[]=sprintf('surveys.created >= %s ',$created_start);
if (!empty($created_end)){
$query[]=sprintf('surveys.created < %s ',$created_end);
}
if (!empty($query)){
return "(" . implode (" AND ",$query) . ")";
}
return false;
}
protected function _build_collections_query()
{
$params=$this->collections;//must always be an array
if (!is_array($params))
{
return FALSE;
}
$param_list=array();
foreach($params as $param)
{
//escape country names for db
$param_list[]=$this->ci->db->escape($param);
}
if ( count($param_list)>0)
{
$params= implode(',',$param_list);
}
else
{
return FALSE;
}
if ($param!='')
{
return sprintf('surveys.id in (select sid from survey_repos where survey_repos.repositoryid in (%s) )',$params);
}
return FALSE;
}
/**
*
* Get the fulltext index or concatenated fields for searching for variables
*/
function get_variable_search_field($is_fulltext=TRUE)
{
$index=array();
$variable_fields=$this->variable_fields();
//select which index to use
if( in_array('name',$variable_fields) )
{
$index[]='name';
}
if( in_array('labl',$variable_fields) )
{
$index[]='labl';
}
if( in_array('qstn',$variable_fields) )
{
$index[]='qstn';
}
if( in_array('catgry',$variable_fields) )
{
$index[]='catgry';
}
if (empty($index))
{
$index[]='name,v.labl,v.qstn,v.catgry,v.keywords';
}
if ($is_fulltext==TRUE)
{
//fulltext
return implode(',',$index);
}
else
{
//concatenated fields
return 'concat(' . implode(",' ',",$index) .')';
}
}
/*
* setup variable fields
*
* Note: sets a variable field to search on. If no field selected by the user, selects the default field.
* the function will always return an array of variable field(s)
*/
function variable_fields()
{
$vf=$this->variable_fields;
if (!is_array($vf))
{
//default search field if nothing is selected
return array('labl,qstn,catgry,keywords');
}