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MySQLµÄ»ù±¾¹¤×÷²½Öè

MySQLµÄ»ù±¾¹¤×÷²½Öè

[[wiki]wiki[/wiki]][/wiki]My[wiki]SQL[/wiki]µÄ»ù±¾¹¤×÷²½Öè²½ÖèÒ»:ʹÓÃ[[wiki]URL[/wiki]=http://bbs.zzchn.com/[wiki]POS[/wiki]t.[wiki]PHP[/wiki]?action=newthread&fid=10&extra=page%3D1#mysql_connect]mysql_connect( )[/url]º¯Êý£¬½¨Á¢ºÍMySQL[wiki]·þÎñÆ÷[/wiki]µÄͨµÀ(¿ÉÄÜͬһ²¿[wiki]¼ÆËã»ú[/wiki])£¬¸ÃÐŵÀÒÔÁ¬½áʶ±ð(link identifier)³ÆÖ®¡£

$link = mysql_connect("localhost", "mysql_user", "mysql_password");

´Ë´¦µÄ$link±äÁ¿ÔÚmysql µÄº¯ÊýÓï·¨¸ñʽÒÔ¡¾resource link_identifier¡¿´Ëresource ±í±äÁ¿µÄÐÍʽ¡£

²½Öè¶þ:ʹÓÃmysql_select-db( )º¯Êý£¬Ñ¡Ôñ²½ÖèÒ»Ö¸¶¨·þÎñÆ÷Öе[wiki]ÄÊ[/wiki]ý¾Ý¿â£¨Òò¿ÉÄÜÓжà¸öÊý¾Ý£©¡£

$link = mysql_connect("localhost", "mysql_user", "mysql_password");
mysql_select_db( ¡°myDataBase¡±, $link);
// $link
¿ÉÊ¡ÂÔ


»ò

mysql_select_db( ¡°myDataBase¡±);

»ò

$myDB = ¡°myDataBase¡±;
mysql_select_db( $myDB);


²½ÖèÈý:ʹÓÃ[url=http://bbs.zzchn.com/post.php?action=newthread&fid=10&extra=page%3D1#mysql_q[wiki]UE[/wiki]ry]mysql_query()[/url]º¯Êý£¬À´Ö´Ðи÷ÖÖ[wiki]Êý¾Ý¿â[/wiki]µÄ²Ù×÷¡£²Ù×÷µÄÄÚÈÝÒÔSQLÓïÑÔ±íÖ®¡£

ÈçÏÔʾ²½ÖèÖÐÖ¸¶¨µÄÊý¾Ý¿âÖеÄijһ±í¸ñ(myTable)ÖÐËùÓеÄÄÚÈÝ¡£

$result = mysql_query (¡°SELECT * from myTable¡±);

$resultΪһָÕëÖ¸Ïò¹¤×÷½á¹ûÇø£¨¹¤×÷±í¸ñ£©£¬ÔÚmysql µÄº¯ÊýÓï·¨¸ñʽÒÔ¡¾resource result¡¿´Ëresource ±í±äÁ¿µÄÐÍʽ¡£
²½ÖèËÄ:ʹÓÃmysql_free_resultº¯Êý£¬´Ó²½ÖèÈýµÄ¹¤×÷½á¹ûÇøÖУ¬ÖðÁÐÈ¡³öÊý¾Ý

$result = mysql_query("SELECT * FROM table1", $link);
$rows = mysql_fetch_array($result);
echo "$rows[¡°name¡±], $rows[¡°sex¡±] \n";

²½ÖèÎå:ʹÓÃmysql_free_resultº¯Êý£¬Êͷʤ×÷½á¹ûÇøµÄÄÚ´æ[wiki]¿Õ¼ä[/wiki]¡£

<?php    $result = mysql_query (¡°SELECT * from myTable¡±);        mysql_free_result($result);?>
²½ÖèÁù:ʹÓÃmysql_closeº¯Êý£¬¹Ø±ÕºÍËÅ·þ»úÁ¬½á¡£

<?php
$link = mysql_connect("localhost", "mysql_user", "mysql_password")

or exit("Could not connect");

print ("Connected successfully");

mysql_close($link);
?>


mysql_close¹Ø±Õ MySQL ·þÎñÆ÷Áª»ú¡£
Óï·¨:bool mysql_close ( [resource link_identifier])
´«»ØÖµ:²¼¶û±äÊýÖµ(Boolean)
³É¹¦»Ø´«  TRUE
ʧ°Ü»Ø´«  FALSE
ÄÚÈÝ˵Ã÷±¾º¯Ê½¹Ø±ÕÓë MySQL Êý¾Ý¿â·þÎñÆ÷µÄÁª»ú¡£ÈôÎÞÖ¸¶¨²ÎÊý link_identifier Ôò»á¹Ø±Õ×îºóµÄÒ»±ÊÁª»ú¡£Óà mysql_pconnect() Áª»úÔòÎÞ·¨Ê¹Óñ¾º¯Ê½¹Ø±Õ¡£Êµ¼ÊÉϱ¾º¯Ê½²»ÊÇÒ»¶¨ÐèÒªµÄ£¬µ± PHP ÕûÒ³[wiki]³ÌÐò[/wiki]½áÊøºó£¬½«»á×Ô¶¯¹Ø±ÕÓëÊý¾Ý¿âµÄ·ÇÓÀ¾ÃÐÔ (non-persistent) Áª»ú¡£³É¹¦´«»Ø true¡¢Ê§°Ü´«»Ø false Öµ¡£
ʹÓ÷¶Àý
<?php
$link = mysql_connect("localhost", "mysql_user", "mysql_password")

or exit("Could not connect");

print ("Connected successfully");

mysql_close($link);
?>
²Î¿¼mysql_connect()


mysql_connect½¨Á¢ºÍ MySQL ·þÎñÆ÷¼äµÄÁª»ú¡£
Óï·¨:resource mysql_connect(string [hostname] [:port], string [use[wiki]RNA[/wiki]me],
string [password]);

´«»ØÖµ:·þÎñÆ÷µÄÐŵÀÖ¸Õ룬Óï·¨ÒÔ¡¸resource link_identifier¡¹±íʾ֮¡£
ÄÚÈÝ˵Ã÷±¾º¯Ê½½¨Á¢Óë MySQL ·þÎñÆ÷µÄÁª»ú¡£ÆäÖÐËùÓеIJÎÊý¶¼¿ÉÊ¡ÂÔ¡£µ±Ê¹Óñ¾º¯Ê½È´²»¼ÓÈκβÎÊýʱ£¬²ÎÊý hostname µÄÄÚ¶¨ÖµÎª localhost¡¢²ÎÊý username µÄÄÚ¶¨ÖµÎª PHP Ö´ÐÐÐг̵ÄÓµÓÐÕß¡¢²ÎÊý password ÔòΪ¿Õ×Ö·û´® (¼´Ã»ÓÐÃÜÂë)¡£¶ø²ÎÊý hostname ºóÃæ¿ÉÒÔ¼ÓðºÅÓ벺º[wiki]Å£[/wiki]¬´ú±íʹÓÃÄǸö²ºÓë MySQL Á¬½Ó¡£µ±È»ÔÚʹÓÃÊý¾Ý¿âʱ£¬ÔçµãʹÓà mysql_close() ½«Áª»ú¹Øµô¿ÉÒÔ½ÚÊ¡×ÊÔ´¡£
ʹÓ÷¶Àý
<?php
$link = mysql_connect("localhost", "mysql_user", "mysql_password")

or die("Could not connect");

print ("Connected successfully");

mysql_close($link);
?>


   $Database = ¡°myDatadase¡±;
   mysql_connect ("localhost", "kh", "75kh07");
   $db = mysql_select_db( $Database );

if ( !
$db ) {


echo
"
ÎÞ·¨¿ªÆôÊý¾Ý¿â!";


exit;


}


ÕâÊÇһλδ¾ßÃûÍøÓÑÌṩµÄ·¶Àý (18-Feb-1999)

<?php
$dbh =
mysql_connect('localhost:3306','mcclain','standard');

mysql_select_db('admreqs');
$query = "insert into requests(date, request, email, priority,status) values (NOW(),'$description', '$email', '$priority', 'NEW')";
$res = mysql_query($query, $dbh);
$query = "select max(id) from requests";
$res = mysql_query($query, $dbh);
$err = mysql_error();
if($err){

echo
"
·¢Éú´íÎó£¬Çë֪ͨ<a href=mailto:webmaster@my.site>Õ¾³¤</a>";

}

$row = mysql_fetch_row($res);


echo
"
δÀ´ÄúʹÓõĺÅÂëΪ: ".$row[0];

?>
²Î¿¼mysql_close()


mysql_errno´«»ØÇ°Ò» MySQL ²Ù×÷µÄ´íÎóѶϢµÄ´úÂ롣ǰһ MySQL ²Ù×÷²»º¬mysql_error() and mysql_errno()¶þº¯Êý¡£
Óï·¨:int mysql_errno ( [resource link_identifier])

´«»ØÖµ:ǰһMySQL º¯Êý×÷Òµ´íÎóʱ£¬´«»Ø´íÎóѶϢµÄ´úÂë¡£
ǰһMySQL º¯Êý×÷ÒµÕý³£Ê±£¬´«»Ø0¡£
ʹÓ÷¶Àý
<?php
mysql_connect("localhost", "mysql_user", "mysql_password");

mysql_select_db("nonexistentdb");

echo mysql_errno() . ": " . mysql_error(). "\n";

mysql_select_db("kossu");

mysql_query("SELECT * FROM nonexistenttable");

echo mysql_errno() . ": " . mysql_error() . "\n";
?>
ÉÏÊö°¸ÀýµÄÊä³öΪ£º
1049: Unknown database 'nonexistentdb'1146: Table 'kossu.nonexistenttable' doesn't exist


mysql_error´«»ØÇ°MySQL¹¤×÷µÄ´íÎóѶϢÄÚÈÝ¡£Ç°Ò» MySQL ²Ù×÷²»º¬mysql_error() and mysql_errno()¶þº¯Êý¡£

Óï·¨:string mysql_error ( [resource link_identifier])
´«»ØÖµ:ǰһMySQL º¯Êý×÷Òµ´íÎóʱ£¬´«»Ø´íÎóѶϢµÄÄÚÈÝ¡£
ǰһMySQL º¯Êý×÷ÒµÕý³£Ê±£¬´«»Ø¿Õ×Ö·û´®¡£
ʹÓ÷¶Àý
<?php
mysql_connect("localhost", "mysql_user", "mysql_password");


mysql_select_db("nonexistentdb");

echo mysql_errno() . ": " . mysql_error(). "\n";

mysql_select_db("kossu");

mysql_query("SELECT * FROM nonexistenttable");

echo mysql_errno() . ": " . mysql_error() . "\n";
?>
ÉÏÊö°¸ÀýµÄÊä³öΪ£º
1049: Unknown database 'nonexistentdb'1146: Table 'kossu.nonexistenttable' doesn't exist

mysql_fetch_array´«»ØÊý×éÊý¾Ý¡£ÒÔÊý¾Ý¿âµÄ×Ö¶ÎÃû³ÆÎªË÷ÒýÖµ¡£
Óï·¨:array mysql_fetch_array(int result, int [result_typ]);
´«»ØÖµ:Êý×é
ÄÚÈÝ˵Ã÷±¾º¯Ê½ÓÃÀ´½«²éѯ½á¹û result ²ðµ½Êý×é±äÁ¿ÖС£Èô result ûÓÐ×ÊÁÏ£¬Ôò´«»Ø false Öµ¡£¶ø±¾º¯Ê½¿ÉÒÔ˵ÊÇ mysql_fetch_row() µÄ¼ÓÇ¿º¯Ê½£¬³ý¿ÉÒÔ½«´«»ØÁм°Êý×ÖË÷Òý·ÅÈëÊý×éÖ®Í⣬»¹¿ÉÒÔ½«ÎÄ×ÖË÷Òý·ÅÈëÊý×éÖС£ÈôÊǺü¸¸ö´«»Ø×ֶζ¼ÊÇÏàͬµÄÎÄ×ÖÃû³Æ£¬Ôò×îºóÒ»¸öÖÃÈëµÄ×Ö¶ÎÓÐЧ£¬½â¾ö·½·¨ÊÇʹÓÃÊý×ÖË÷Òý»òÕßΪÕâЩͬÃûµÄ×Ö¶Î (column) È¡±ðÃû (alias)¡£ÖµµÃ×¢ÒâµÄÊÇʹÓñ¾º¯Ê½µÄ´¦Àí[wiki]ËÙ¶È[/wiki]Æäʵ²»»á±È mysql_fetch_row() º¯Ê½Âý£¬ÒªÓÃÄĸöº¯Ê½»¹ÊÇ¿´Ê¹ÓõÄ[wiki]ÐèÇó[/wiki]¾ö¶¨¡£²ÎÊý result_typ ÊÇÒ»¸ö³£ÊýÖµ£¬ÓÐÒÔϼ¸ÖÖ³£Êý MYSQL_ASSOC¡¢MYSQL_NUM Óë MYSQL_BOTH¡£
ʹÓ÷¶Àý<?php
mysql_connect($host,$user,$password);
$result = mysql_db_query("database","select * from table");
while($row = mysql_fetch_array($result)) {

echo
$row["user_id"];


echo
$row["fullname"];

}
mysql_free_result($result);
?>

<?php $link = mysql_connect("localhost", "mysql_user", "mysql_password");mysql_select_db("database", $link); $result = mysql_query("SELECT * FROM table1", $link);$rows = mysql_fetch_array($result); echo "$rows[¡°name¡±], $rows[¡°sex¡±] \n"; ?>


mysql_fetch_row´«»Øµ¥Áеĸ÷×ֶΡ£ÒÔÊý×ÖΪË÷ÒýÖµ²¢ÓÉ 0 ¿ªÊ¼Æð¡£
Óï·¨: array mysql_fetch_row(int result);
´«»ØÖµ:Êý×é (array)
ÄÚÈÝ˵Ã÷±¾º¯Ê½ÓÃÀ´½«²éѯ½á¹û result Ö®µ¥Áвðµ½Êý×é±äÁ¿ÖС£Êý×éµÄË÷ÒýÊÇÊý×ÖË÷Òý£¬µÚÒ»¸öµÄË÷ÒýÖµÊÇ 0¡£Èô result ûÓÐ×ÊÁÏ£¬Ôò´«»Ø false Öµ¡£
ʹÓ÷¶Àý
<?php
mysql_connect($host,$user,$password);
$result = mysql_db_query("database","select * from table");
while($row = mysql_fetch_row($result)) {

echo
$row[0];


echo
$row[1];

}
mysql_free_result($result);
?>



<?php $link = mysql_connect("localhost", "mysql_user", "mysql_password");mysql_select_db("database", $link); $result = mysql_query("SELECT * FROM table1", $link);$num_rows = mysql_fetch_rows($result); echo "$rows[0], $rows[1] \n"; ?>

²Î¿¼mysql_fetch_array()  [url=http://bbs.zzchn.com/ÕZÑÔÊÖƒÔphpphp-ÖÐÎÄ•øebook1function.php-mysql_fetch_[wiki]object[/wiki].htm]mysql_fetch_object()[/url]  mysql_data_seek()  mysql_fetch_lengths()  mysql_result()


mysql_free_resultÊͷʤ×÷½á¹ûÇøµÄÄÚ´æ¿Õ¼ä¡£
Óï·¨:bool mysql_free_result ( resource result)

ÊͷźÍresultʶ±ðÏà¹ØµÄÄÚ´æ¿Õ¼ä¡£
´«»ØÖµ:²¼¶û±äÊýÖµ(Boolean)
³É¹¦»Ø´«  TRUE
ʧ°Ü»Ø´«  FALSE

ÄÚÈÝ˵Ã÷µ±¸Ã³ÌÐò(script)Ö´ÐÐÍê±Ï£¬ÕâЩ¿Õ¼ä»á×Ô¶¯µÄ½â³ý¡£³ý·ÇʹÓôóÁ¿µÄ¼ÇÒ䣬·ñÔò²»ÐèÖ´Ðб¾ mysql_free_result()
º¯Êý¡£


mysql_insert_id
´«»Ø×îºóÒ»´ÎʹÓà INSERT Ö¸ÁîµÄ ID¡£
Óï·¨:int mysql_insert_id(int [link_identifier]);
´«»ØÖµ:1.
0
£º ÈôǰһSQL²éѯδ²úÉúAUTO_INCREMENTֵʱ£¬¹Ê±ØÐëíÔ¶¨Ê¹Óñ¾mysql_insert_id()º¯Êý£¬½ô½Ó×ŲúÉúAUTO_INCREMENTÖµº¯ÊýÖ®ºó¡£

2.
ÉϱʵIJåÈë¼Ç¼µÄË÷ÒýÖµ£ºÎªÇ°Ò»INSERT²éѯ£¬¶Ô¶¨ÒåΪAUTO_INCREMENT×Ö¶ÎËù²úÉúµÄÖµ¡£

ÄÚÈÝ˵Ã÷±¾º¯Ê½¿ÉÒԵõ½×îºóÒ»´ÎʹÓà INSERT µ½ MySQL Êý¾Ý¿âµÄÖ´ÐÐ ID¡£sleibowitz@btcwcu.org (13-May-1999) Ö¸³öÔÚ PHP 3.0.7 °æÓà REPLACE Ò²ºÍʹÓà INSERT Ò»Ñù£¬¿ÉÒÔʹÓñ¾º¯Ê½»ñµÃ ID¡£
Èôδָ¶¨Í¨Â·Ê¶±ð( link_identifier )ʱ£¬¼ÙÉèΪ×îºó½¨Á¢µÄͨµÀ¡£
ʹÓ÷¶Àý
<?php
mysql_connect("localhost", "mysql_user", "mysql_password") or

die("could not connect");

mysql_select_db("mydb");

mysql_query("INSERT INTO mytable (product) values ('kossu')");

printf ("Last inserted record has id %d\n",
mysql_insert_id());
?>



mysql_list_fields
ÁгöÖ¸¶¨Êý¾Ý±íµÄ×Ö¶Î (field)¡£
Óï·¨:int mysql_list_fields(string database_name, string table_name, int [link_identifier]);
´«»ØÖµ: ÕûÊý
ÄÚÈÝ˵Ã÷±¾º¯Ê½¿ÉÒԵõ½Ö¸¶¨µÄ×ÊÁϱíµÄËùÓÐ×ֶΡ£´«»ØµÄ×Ö¶Î[wiki]ÐÅÏ¢[/wiki]¿ÉÒÔ¹© mysql_field_flags()¡¢mysql_field_len()¡¢mysql_field_name() ¼° [url=http://bbs.zzchn.com/ÕZÑÔÊÖƒÔphpphp-ÖÐÎÄ•øebook1function.php-mysql_field_[wiki]type[/wiki].htm]mysql_field_type()[/url] µÈº¯Ê½Ê¹Óá£ÈôÓдíÎóÔò´«»Ø -1¡£
ʹÓ÷¶Àý

mysql_num_rowsÈ¡µÃ´«»ØÁеÄÊýÄ¿¡£
Óï·¨:
int
mysql_num_rows(int result);

´«»ØÖµ:ÕûÊý
ÄÚÈÝ˵Ã÷±¾º¯Ê½¿ÉÒԵõ½´«»ØÁеÄÊýÄ¿¡£
³£ÓÃÒÔ¶¯Ì¬µÄ²úÉú£¬Êý¾Ý±íµÄÄÚÈÝÊý¡£
ʹÓ÷¶Àý²éѯÔÚtable1 ÄÚµÄÊý¾Ý±ÊÊý¡£

<?php $link = mysql_connect("localhost", "mysql_user", "mysql_password");mysql_select_db("database", $link); $result = mysql_query("SELECT * FROM table1", $link);$num_rows = mysql_num_rows($result); echo "$num_rows Rows\n"; ?>

mysql_queryËͳöÒ»¸ö query ×Ö·û´®£¬¸øMySQL¶ÔÏÖÓõÄÊý¾Ý¿âÖ´ÐÐ×÷Òµ¡£
Óï·¨:resource mysql_query ( string query [, resource link_identifier [, int result_mode]])

´«»ØÖµ:1.
µ± query Ö¸Á[wiki]îÊ[/wiki]Ç UPDATE¡¢INSERT ¼° DELETE ʱ£¬Ôò´«»ØµÄÖµ¿ÉÄÜÊÇ true »òÕß false£»

2.
µ± query Ö¸ÁîÊÇSELECT ,SHOW,E[wiki]XP[/wiki]LAIN or DESCRIBEµÈ³ÂÊöʱ£¬Ôò´«»ØÒ»¸öÖ¸±êÓÃÒÔÖ¸Ïò¹¤×÷µÄ½á¹ûÇø£¨ÎªÒ»¶þά±í¸ñ£©¡£Ö¸ÕëÔÚmysql µÄº¯ÊýÓï·¨¸ñʽÒÔ¡¾resource result¡¿´Ëresource ±í±äÁ¿µÄÐÍʽ¡£

3.
joey@samaritan.com (09-Feb-1999)
Ö¸³ö£¬µ±´«»Ø false ʱ£¬²¢²»ÊÇÖ´Ðгɹ¦µ«ÎÞ´«»ØÖµ£¬¶øÊDzéѯµÄ×Ö·û´®ÓдíÎó¡£

4.
´«»Ø·ÇfalseµÄÖµ£¬½ö´ú±í¸Ã²éѯµÄÓï·¨ÊǺϺõÎÄ·¨£¬µ«²»±£Ö¤ÓïÒâÊÇÕýÈ·µÄ¡£

ÄÚÈÝ˵Ã÷±¾º¯Ê½Ëͳö query ×Ö·û´®¹© MySQL ×öÏà¹ØµÄ´¦Àí»òÕßÖ´ÐС£Èôδָ¶¨Í¨Â·Ê¶±ð( link_identifier )ʱ£¬Ôò³ÌÐò»á×Ô¶¯¼ÙÉèΪ×îºó½¨Á¢µÄͨµÀ¡£
²ÎÊýresult_mode ΪһѡÏî²ÎÊý£¬ÆäÖµÓУº
1.
MYSQL_USE_RESULT

2.
MYSQL_STORE_RESULT

ĬÈÏֵΪ£ºMYSQL_STORE_RESULT, ¼´½á¹û(result)ÊÇÔÝ´æÔÚ»º³åÇø(buffered)ÄÚÖС£.
²Î¼ûmysql_unbuffered_query() µÄÁíÒ»ÖÖÏà·´µÄ×÷·¨¡£
×¢Ò⣺SQL²éѯ×Ö·û´®²»¿ÉÒÔ·ÖºÅ(;)½áÊø¡£
ʹÓ÷¶Àý²éѯ×Ö·û´®µÄÓï·¨´íÎ󣬴«»ØFALSE¡£
<php$result = mysql_query("SELECT * WHERE 1=1")
or die("Invalid query");
?>

Àý¶þ£ºÈô×Ö¶Î(my_col)²»ÎªÊý¾Ý±í(my_tbl)µÄ×ֶΣ¬Ôò»Ø´«FALSE¡£

<?php$result = mysql_query("SELECT my_col FROM my_tbl")
or die ("Invalid query");
?>

²Î¿¼mysql_select_db()  mysql_connect()


mysql_select_db
´ÓMySQLËÅ·þÕ¾ÖУ¬Ñ¡ÔñÒ»¸öÊý¾Ý¿â¡£
Óï·¨:bool mysql_select_db ( string database_name [, resource link_identifier])
´«»ØÖµ:²¼¶û±äÊýÖµ(Boolean)
³É¹¦»Ø´«  TRUE
ʧ°Ü»Ø´«  FALSE
ÄÚÈÝ˵Ã÷±¾º¯Ê½mysql_select_db£¨£© É趨ÔÚÁ¬½áʶ±ð(link identifier) Ö¸¶¨µÄ·þÎñÆ÷ÉϵÄÏÖÓõÄÊý¾Ý¿â£¬ÒÔ¹©Ö®ºóµÄÊý¾Ý²éѯ×÷Òµ (query) ´¦Àí¡£³É¹¦´«»Ø true£¬Ê§°ÜÔò´«»Ø false¡£
Èç¹ûûÓÐÖ¸¶¨Á¬½áʶ±ð(link identifier)£¬Ôò¼ÙÉèΪ×îºó´ò¿ªµÄÁ¬½á¡¾mysql_connect£¨£©¡¿¡£
ʹÓ÷¶Àý
²Î¿¼mysql_connect()  mysql_pconnect()  mysql_query()

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