如果你想保持目前的設計與存儲在單個單元格觀點,那麼有什麼可以做。雖然我不建議它,但我會在下面舉一個例子,因爲您已經設計好了這樣的項目。
注意:這是一個測試示例,查看基本功能。這不是最終的代碼導致sql注入和其他事情不考慮。
我做到這一點的看法是存儲在單個單元格,空間分隔的假設,如果一個視圖由多於一個字 - 是發生在之間,例如城市中心。
研究這個例子,看看你可以把它調整到您的需要:
<?PHP
echo '<pre>';
//mysql connect
mysql_connect('localhost', 'root','');
mysql_select_db("test");
//add some tsting data
addTestingData();
//build sql from user input via $_GET
$sqlConditions = builtSql();//build sql conditions
$sql = 'select * from `building` where '.$sqlConditions;//build final sql
//get data from mysql
$result = mysql_query($sql) ;
while($row= mysql_fetch_row($result))
print_r($row);
///////////////end////////////////////////////////////////////
function addTestingData()
{
mysql_query("DROP TABLE IF EXISTS `Building`");
mysql_query("
CREATE TABLE `Building` (
`building_uniqueid` MEDIUMINT UNSIGNED NOT NULL ,
`building_street` VARCHAR(30) NOT NULL,
`building_street_nr` VARCHAR(7) NOT NULL,
`building_neighborhood` VARCHAR(30) NOT NULL,
`building_view` VARCHAR(250) NOT NULL,
`building_condition` VARCHAR(150) NOT NULL,
`building_frontage` VARCHAR(30) NOT NULL,
`building_listprice` float NOT NULL,
`building_year` smallint not null,
`bsnss_comments` VARCHAR(255),
PRIMARY KEY (`building_uniqueid`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 ROW_FORMAT=COMPACT;
");
mysql_query('
insert into `building` (`building_uniqueid`,`building_street`,`building_street_nr`,
`building_neighborhood`,`building_view`,`building_condition`,`building_frontage`,
`building_listprice`,`building_year`,`bsnss_comments`) values
("1","street1","strnr1","neighb1","Mountain Ocean Lake Park City-Center",
"good","frontage1","500.3","1990","good building")
');
mysql_query('
insert into `building` (`building_uniqueid`,`building_street`,`building_street_nr`,
`building_neighborhood`,`building_view`,`building_condition`,`building_frontage`,
`building_listprice`,`building_year`,`bsnss_comments`) values
("id2","street1","strnr1","neighb2","River Ocean Lake Park City-Center",
"very good","frontage1","800.5","1991","good building")
') or die(mysql_error());
mysql_query('
insert into `building` (`building_uniqueid`,`building_street`,`building_street_nr`,
`building_neighborhood`,`building_view`,`building_condition`,`building_frontage`,
`building_listprice`,`building_year`,`bsnss_comments`) values
("3","street3","strnr3","neighb1","Ocean Park City-Center",
"fantastic","frontage77","600.7","1994","good building")
');
mysql_query('
insert into `building` (`building_uniqueid`,`building_street`,`building_street_nr`,
`building_neighborhood`,`building_view`,`building_condition`,`building_frontage`,
`building_listprice`,`building_year`,`bsnss_comments`) values
("4","street4","strnr4","neighb1","Ocean Park Mountain City-Center",
"good","frontage1","500.23","1994","good")
');
$_GET['Neighborhood']=array('neighb1');
$_GET['View']=Array('Mountain','River', 'City Center');
$_GET['Condition']=array('good','very good');
$_GET['Frontage']=array('frontage77','frontage1');
$_GET['minPrice']='500';
$_GET['maxPrice']='600';
$_GET['minYear']='1990';
$_GET['maxYear']='1995';
}
function builtSql()
{
$sqlBuild = '(';
//formate sql for Neighborhood
foreach($_GET['Neighborhood'] as $value)
$sqlBuild .=' `building_neighborhood` = \''.$value.'\' or ';
$sqlBuild=removeLastOr($sqlBuild);
$sqlBuild.=') and (';
//formate sql for View
foreach($_GET['View'] as $value)
$sqlBuild .=' `building_view` LIKE \'%'.str_replace(" ", "-",$value).'%\' or ';
$sqlBuild=removeLastOr($sqlBuild);
$sqlBuild.=') and (';
//formate sql for Condition
foreach($_GET['Condition'] as $value)
$sqlBuild .=' `building_condition` = \''.$value.'\' or ';
$sqlBuild=removeLastOr($sqlBuild);
$sqlBuild.=') and (';
//formate sql for Frontage
foreach($_GET['Frontage'] as $value)
$sqlBuild .=' `building_frontage` = \''.$value.'\' or ';
$sqlBuild=removeLastOr($sqlBuild);
$sqlBuild.=') and (';
//formate sql for Price
$sqlBuild.=
' `building_listprice` BETWEEN \''.$_GET['minPrice'].'\' and \''.$_GET['maxPrice'].'\' ';
$sqlBuild=removeLastOr($sqlBuild);
$sqlBuild.=') and (';
//formate sql for Year
$sqlBuild.=
' `building_year` BETWEEN \''.$_GET['minYear'].'\' and \''.$_GET['maxYear'].'\' ';
$sqlBuild.=') ';
return $sqlBuild;
}
function removeLastOr($str)
{
$tmp=substr($str ,0,(strlen($str)-2));
return $tmp=substr($str ,0,(strlen($str)-3));
}
?>
雖然你看到一些foreach循環,沒有必要擔心,因爲它們運行包含用戶數據的小一陽指,所以考慮他們運行速度超快,因爲沒有涉及mysql查詢!
如果有任何問題仍然考慮在DB模式和一些基本的描述透露更多細節。希望這可以幫助!
嘗試使用distinct:http://dev.mysql.com/doc/refman/5.0/en/distinct-optimization.html – JellyBelly
SQL注入警告,請閱讀:http://stackoverflow.com/questions/332365/xkcd-sql-injection-please-explain – Johan