快捷搜索:  as  test  1111  test aNd 8=8  test++aNd+8=8  as++aNd+8=8  as aNd 8=8

和记娱棒h88285:对MYSQL进行全文检索的PHP类库



真是好器械,但我还没钻研出来,假如要看这个法度榜样的具体阐明和演示,请到这个地方看,真的很爽: http://steven.haryan.to/php/KwIndex.html

留意,只能在linux,unix下用。

n";

}

class KwIndex {

# CONSTRUCTOR

#############

function KwIndex($args) {

# check for argument type

if (!is_array(&$args))

die("KwIndex: constructor: syntax: KwIndex(array $args)");

# check for unknown arguments

$known_arguments = array_flip(array(

"linkid", "db_name", "hostname", "username", "password",

"index_name", "wordlist_cardinality", "doclist_cardinality",

"stoplist_cardinality", "vectorlist_cardinality",

"max_word_length", "use_persistent_connection"));

while(list($k,$v) = each($args))

if (!isset($known_arguments[$k]))

die("KwIndex: constructor: unknown argument `$k'");

# required for required arguments

if (!isset($args["db_name"]))

die("KwIndex: constructor: You must specify 'db_name'");

if (!isset($args["linkid"]) &&

(!isset($args["hostname"]) || !isset($args["username"]) ||

!isset($args["password"])))

die("KwIndex: constructor: You must either specify 'linkid' or ".

"arguments to mysql_connect ('hostname', 'username', and ".

"'password')");

# supply default values for optional arguments

if (!isset($args["index_name"]))

$args["index_name"] = "kwindex";

if (!isset($args["wordlist_cardinality"]))

$args["wordlist_cardinality"] = 100000;

if (!isset($args["stoplist_cardinality"]))

$args["stoplist_cardinality"] = 10000;

if (!isset($args["vectorlist_cardinality"]))

$args["vectorlist_cardinality"] = 100000000;

if (!isset($args["doclist_cardinality"]))

$args["doclist_cardinality"] = 1000000;

if (!isset($args["max_word_length"]))

$args["max_word_length"] = 32;

if (!isset($args["use_persistent_connection"]))

$args["use_persistent_connection"] = 1;

# set object attributes

$this->db_name = $args["db_name"];

$this->index_name = $args["index_name"];

$this->wordlist_cardinality = $args["wordlist_cardinality"];

$this->stoplist_cardinality = $args["stoplist_cardinality"];

$this->vectorlist_cardinality = $args["vectorlist_cardinality"];

$this->doclist_cardinality = $args["doclist_cardinality"];

$this->max_word_length = $args["max_word_length"];

if (!isset($args["linkid"])) {

if ($args["use_persistent_connection"]) {

$linkid = mysql_pconnect($args["hostname"], $args["username"],

$args["password"]);

} else {

$linkid = mysql_connect($args["hostname"], $args["username"],

$args["password"]);

}

if (!$linkid)

die("KwIndex: constructor: Can't connect to database: ".

mysql_error());

} else {

$linkid = $args["linkid"];

}

$this->linkid = $linkid;

$idx = $this->index_name;

if (!mysql_select_db($this->db_name, $linkid))

die("KwIndex: constructor: Can't select DB: ".

mysql_error($linkid));

if (!$this->_index_exists()) $this->_create_index();

# load stoplist as keys of array

$this->stoplist = array();

if (!($res = mysql_query("SELECT word FROM ${idx}_stoplist",

$linkid)))

die("KwIndex: constructor: Can't load stoplist: ".

mysql_error($linkid));

while($row = mysql_fetch_row($res)) {

$this->stoplist[ strtolower($row[0]) ] = 1;

}

} // constructor

# PUBLIC METHODS

################

function &document_sub($doc_ids) {

die("KwIndex: document_sub: this method must be overriden");

}

function add_document($doc_ids) {

if (!is_array(&$doc_ids))

die("KwIndex: syntax: add_document(array $doc_ids)");

if (!sizeof(&$doc_ids)) return 1;

$wordlist = array();

# structure: ( 'word1' => [ [doc_id,freq], ... ], ... )

$doclist = array();

# format: ( doc_id => n, ... ); # n = number of words in document

# retrieve documents

####################

$docs = $this->document_sub(&$doc_ids);

if(!is_array(&$docs))

die("KwIndex: add_document: ".

"'document_sub' does not return an array");

if (sizeof(&$doc_ids)sizeof(&$docs))

die("KwIndex: add_document: ".

"'document_sub' returns too many documents");

# split documents into words

############################

while(list($id, $doc) = each($docs)) {

if (!isset($doc) || !strlen($doc)) continue;

$words = $this->_split_to_words($doc);

$num_of_words = sizeof(&$words);

# note: this means that numbers, etc are counted

$doclist[$id] = $num_of_words;

# filter non-qualifying words: 1-char length, numbers, words

# that are too long

$w2 = array();

while(list($k, $v) = each($words)) {

$len = strlen($v);

$lower_v = strtolower($v);

if ($len > 1 &&

$len max_word_length &&

preg_match("/[a-z]/", $lower_v) &&

!isset($this->stoplist[$lower_v])) ++$w2[ $lower_v ];

}

while(list($k, $v) = each($w2)) {

$lower_k = strtolower($k);

if (!isset($wordlist[$lower_k]))

$wordlist[$lower_k] = array();

array_push($wordlist[$lower_k], array($id, $v/$num_of_words));

}

}

#_debug("wordlist: ", Dumper($wordlist));

# submit to database

####################

$linkid = $this->linkid;

$idx = $this->index_name;

# lock the tables in case some other process remove a certain word

# between step 0 and 1 and 2 and 3

if(!mysql_query("LOCK TABLES ${idx}_doclist WRITE, ".

"${idx}_vectorlist WRITE, ".

"${idx}_wordlist WRITE",

$linkid)) {

$this->ERROR = "Can't lock tables when adding documents: ".

mysql_error($linkid);

return;

}

# 0

# add the docs first

#_debug( "doclist = ", Dumper($doclist));

while(list($k,$v) = each($doclist)) {

if(!mysql_query("REPLACE INTO ${idx}_doclist (id,n) VALUES (".

"'".(addslashes($k))."'".

",".

"'".(addslashes($v))."'".

")",

$linkid)) {

$this->ERROR = "Can't add doc id=`$_' to doclist: ".

mysql_error($linkid);

mysql_query("UNLOCK TABLES", $linkid);

return;

}

}

# 1

# and then add the words

while(list($k,$v) = each($wordlist)) {

if(!mysql_query("INSERT IGNORE INTO ${idx}_wordlist (word) ".

"VALUES (".

"'".(addslashes($k))."'".

")",

$linkid)) {

$this->ERROR = "Can't add word `$k' to wordlist: ".

mysql_error($linkid);

mysql_query("UNLOCK TABLES", $linkid);

return

;

}

}

# 2

# get the resulting word ids

$word_ids = array();

$e_wordlist = array();

reset($wordlist);

while(list($k,$v) = each($wordlist))

array_push($e_wordlist, "'".addslashes($k)."'");

if (sizeof(&$wordlist)) {

if(!($res = mysql_query("SELECT id,word FROM ${idx}_wordlist ".

"WHERE word IN (".

join(',', $e_wordlist).

")",

$linkid))) {

$this->ERROR = "Can't get data from wordlist: ".

mysql_error($linkid);

mysql_query('UNLOCK TABLES', $linkid);

return;

}

while($row = mysql_fetch_row($res)) {

#echo "row = ", Dumper($row), "

n";

$word_ids[ $row[1] ] = $row[0];

}

}

# 3

# now add the vectors

#_debug("word_ids = ", Dumper($word_ids));

reset($wordlist);

while (list($word, $hitlist) = each($wordlist)) {

while(list($i, $hit) = each($hitlist)) {

#echo "adding word=$word, hit = ($hit[0], $hit[1])

n";

if(!mysql_query("INSERT INTO ${idx}_vectorlist (wid,did,f)".

"VALUES (".

("'".addslashes($word_ids[$word]))."',".

("'".addslashes($hit[0]))."',".

("'".addslashes($hit[1]))."')",

$linkid)) {

$this->ERROR = "Can't add to vectorlist: ".

mysql_error($linkid);

mysql_query('UNLOCK TABLES', $linkid);

return;

}

}

}

# if all goes well, return TRUE

mysql_query('UNLOCK TABLES', $linkid);

return 1;

}

function remove_document($doc_ids) {

if (!is_array(&$doc_ids))

die("KwIndex: syntax: remove_document(array $doc_ids)");

if (!sizeof(&$doc_ids)) return 1;

$linkid = $this->linkid;

$idx = $this->index_name;

if(!mysql_query("LOCK TABLES ${idx}_doclist WRITE, ".

"${idx}_vectorlist WRITE",

$linkid)) {

$this->ERROR = "Can't lock tables when removing documents: ".

mysql_error($linkid);

return;

}

if(!mysql_query("DELETE FROM ${idx}_doclist WHERE id IN (".

join(',', $doc_ids).")",

$linkid)) {

$this->ERROR = "Can't delete from doclist: ".

mysql_error($linkid);

mysql_query('UNLOCK TABLES', $linkid);

return;

}

if(!mysql_query("DELETE FROM ${idx}_vectorlist WHERE did IN (".

join(',', $doc_ids).")",

$linkid)) {

$this->ERROR = "Can't delete from vectorlist: ".

mysql_error($linkid);

mysql_query('UNLOCK TABLES', $linkid);

return;

}

# if all goes well, return TRUE

mysql_query("UNLOCK TABLES", $linkid);

return 1;

}

function update_document($doc_ids和记娱棒h88285) {

if (!is_array(&$doc_ids))

die("KwIndex: syntax: update_document(array $doc_ids)");

if (!sizeof(&$doc_ids)) return 1;

return $this->remove_document(&$doc_ids) &&

$this->add_document(&$doc_ids);

}

# find all words that are contained in at least $k % of all documents

function和记娱棒h88285 &common_word($k = 80) {

$linkid = $this->linkid;

$idx = $this->index_name;

# first select the number of documents

$num = $this->document_count();

if ($num == -1) {

$this->ERROR = "Can't retrieve the number of documents: ".

mysql_error($linkid);

return;

}

# get the statistics from vectorlist

if(!($res1 = mysql_query("SELECT wid,COUNT(*)/$num as k FROM

${idx}_vectorlist GROUP BY wid HAVING k>=".

($k/100),

$linkid))) {

$this->ERROR = "Can't retrieve common words: ".

mysql_error($linkid);

return;

}

$wids = array();

while($row = mysql_fetch_row($res1)) array_push($wids, $row[0]);

# convert it to word by consulting the wordlist table

$words = array();

if (sizeof(&$wids)) {

if (!($res2 = mysql_query("SELECT word FROM ${idx}_wordlist ".

"WHERE id IN (".join(',', $wids).

")",

$linkid))) {

$this->ERROR = "Can't retrieve common words: ".

mysql_error($linkid);

return;

}

while($row = mysql_fetch_row($res2))

array_push($words, $row[0]);

}

return $words;

}

# find all words that are not contained in all documents (vectorlist)

# XXX not yet written

function &orphan_word() {

return array();

}

# remove words from index

function remove_word($words) {

if (!is_array(&$words))

die("KwIndex: syntax: remove_word(array $words)");

$linkid = $this->linkid;

$idx = $this->index_name;

if(!mysql_query("LOCK TABLES ${idx}_wordlist WRITE, ".

"${idx}_vectorlist WRITE",

$linkid)) {

$this->ERROR = "Can't lock tables when removing words: ".

mysql_error($linkid);

return;

}

$e_words = array();

while(list($k,$v) = each($words))

array_push($e_words, "'".addslashes(strtolower($v))."'");

# retrieve word ids

if(!($res0 = mysql_query("SELECT id FROM ${idx}_wordlist WHERE ".

"word IN (".join(',', $e_words).")",

$linkid))) {

$this->ERROR = "Can't delete from wordlist: ".

mysql_error($linkid);

mysql_query('UNLOCK TABLES', $linkid);

return;

}

$word_ids = array();

while($row = mysql_fetch_row($res0))

array_push($word_ids, $row[0]);

$word_ids = join(',', $word_ids); # we'll make it a string

if (!strlen($word_ids)) return 1;

# delete from wordlist

if(!mysql_query("DELETE FROM ${idx}_wordlist WHERE id IN ".

"($word_ids)",

$linkid)) {

$this->ERROR = "Can't delete from wordlist: ".

mysql_error($linkid);

mysql_query("UNLOCK TABLES", $linkid);

return;

}

if(!mysql_query("DELETE FROM ${idx}_vectorlist WHERE wid IN ".

"($word_ids)", $linkid)) {

$this->ERROR = "Can't delete from vectorlist: ".

mysql_error($linkid);

mysql_query("UNLOCK TABLES", $linkid);

return;

}

return 1;

}

# add stop words. note: you must manually delete previously indexed

# words with delete_word()

function add_stop_word($words) {

if (!is_array(&$words))

die("KwIndex: syntax: add_stop_word(array words)");

if (!sizeof(&$words)) return 1;

$linkid = $this->linkid;

$idx = $this->index_name;

while(list($k, $v) = each($words)) {

$lv = strtolower($v);

if(!mysql_query("REPLACE INTO ${idx}_stoplist (word) VALUES (".

("'".addslashes($lv)."'").

")", $linkid)) {

$this->ERROR = "Can't add to stoplist: ".

mysql_error($linkid);

return;

}

$this->stoplist[ $lv ] = 1;

}

return 1;

}

# remove stop words from index

function remove_stop_word($words) {

if (!is_array(&$words))

die("KwIndex: syntax: remove_stop_word(array words)")和记娱棒h88285;

if (!sizeof(&$words)) return 1;

$linkid = $this->linkid;

$idx = $this->index_name;

$e_words = array();

while(list($k,$v) = each($words))

array_push($e_words, "'".addslashes(strtolower($v))."'");

if(!mysql_query("DELETE FROM ${idx}_stoplist WHERE word IN (".

join(',', $e_words).")",

$linkid)) {

$this->ERROR = "Can't delete from stoplist: ".

m和记娱棒h88285ysql_error($linkid);

return;

}

while(list($k,$v) = each($words))

unset($this->stoplist[ strtolower($v) ]);

return 1;

}

function is_stop_word($word) {

return isset($this->stoplist[ strtolower($word) ]);

}

function &_search_or_match_count($is_count, &$args) {

if (!isset($args["words"]))

die("KwIndex: search: option 'words' must be defined");

$linkid = $this->linkid;

$idx = $this->index_name;

# split the words if we are offered a single string/not array

# (assume it's a phrase)

$words = array();

if (is_array(&$args["words"])) {

$words = $args["words"];

} else {

$words = $this->_split_to_words($args["words"]);

}

# delete duplicate words, convert them all to lowercase

$hashwords = array();

while(list($k,$v) = each($words)) $hashwords[ strtolower($v) ] = 1;

$words = array_keys(&$hashwords);

if (!sizeof(&$words)) {

if ($is_count) {

return 0;

} else {

return array();

}

}

# first we retrieve the word ids

$op = $args["re"] ? 'REGEXP':'LIKE';

$bool = isset($args['boolean']) && $args['boolean'] &&

strtoupper($args['boolean']) == 'AND' ? 'AND':'OR';

$op_phrases = array();

while(list($k,$v) = each($words))

array_push($op_phrases, "word $op '".addslashes($v)."'");

if (!($res0 = mysql_query("SELECT id FROM ${idx}_wordlist WHERE ".

join(' OR ', $op_phrases),

$linkid))) {

$this->ERROR = "Can't retrieve word ids: ".mysql_error($linkid);

return;

}

$word_ids = array();

while($row = mysql_fetch_row($res0)) array_push($word_ids, $row[0]);

if (!sizeof(&$word_ids) ||

($bool == 'AND' && sizeof(&$word_ids) = ".sizeof(&$word_ids);

} else {

$can_optimize=1;

$stmt = "SELECT COUNT(DISTINCT did) ".

"FROM ${idx}_vectorlist WHERE wid IN (".

join(',',$word_ids).

")";

}

} else { // ! $is_count

$stmt = "SELECT did, count(wid) as c, avg(f) as a, ".

"count(wid)*count(wid)*count(wid)*avg(f) as ca ".

"FROM ${idx}_vectorlist WHERE wid IN (".

join(',',$word_ids).

") ".

"GROUP BY did ".

($bool == 'AND' && !$args['re'] ?

"HAVING c >= ".sizeof(&$word_ids):').

" ORDER BY ca DESC ".

(isset($args['num']) ? "LIMIT " . (isset($args['start']) ?

(($args['start'] - 1).",".$args['num']) : $args['num'])

:');

}

_debug("search SQL: ", $stmt);

if(!($res = mysql_query($stmt, $linkid))) {

$this->ERROR = "Can't search vectorlist: ".mysql_error($linkid);

return;

}

if ($is_count) {

if ($can_optimize) {

$row = mysql_fetch_row($res);

return $row[0];

} else {

return mysql_num_rows($res);

}

} else { // ! $is_count

$doc_ids = array();

while($row = mysql_fetch_row($res)) array_push($doc_ids, $row[0]);

return $doc_ids;

}

}

function &search($args) {

return $this->_search_or_match_count(0, &$args);

}

function &match_count($args) {

return $this->_search_or_match_count(1, &$args);

}

function remove_index() {

$linkid = $this->linkid;

$idx = $this->index_name;

if(!mysql_query("DROP TABLE IF EXISTS ${idx}_wordlist", $linkid)) {

$this->ERROR = "Can't remove table ${idx}_wordlist: ".

mysql_error($linkid);

return;

}

if(!mysql_query("DROP TABLE IF EXISTS ${idx}_doclist", $linkid)) {

$this->ERROR = "Can't remove table ${idx}_doclist: ".

mysql_error($linkid);

return;

}

if(!mysql_query("DROP TABLE IF EXISTS ${idx}_vectorlist", $linkid)) {

$this->ERROR = "Can't remove table ${idx}_vectorlist: ".

mysql_error($linkid);

return;

}

if(!mysql_query("DROP TABLE IF EXISTS ${idx}_stoplist", $linkid)) {

$this->ERROR = "Can't remove table ${idx}_stoplist: ".

mysql_error($linkid);

return;

}

return 1;

}

function empty_index() {

return $this->remove_index() && $this->_create_index();

}

# number of documents in the collection

function document_count() {

$linkid = $this->linkid;

$idx = $this->index_name;

if (!($res = mysql_query("SELECT COUNT(*) FROM ${idx}_doclist",

$linkid))) return;

$row = mysql_fetch_row($res);

return $row[0];

}

# number of unique words

function word_count() {

$linkid = $this->linkid;

$idx = $this->index_name;

if (!($res = mysql_query("SELECT COUNT(*) FROM ${idx}_wordlist",

$linkid))) return;

$row = mysql_fetch_row($res);

ret和记娱棒h88285urn $row[0];

}

# PRIVATE METHODS

#################

function &_split_to_words($str) {

preg_match_all("/b(w[w']*w+|w+)b/", $str, $matches);

return $matches[1];

}

免责声明:以上内容源自网络,版权归原作者所有,如有侵犯您的原创版权请告知,我们将尽快删除相关内容。

您可能还会对下面的文章感兴趣: