多个查询条件的sql话语的拼写技巧,求指点

$sql="select * from tb1";

if($id=$_GET['id'])

{

	$where.=" where id like "%$id%"";

}

if($name=$_GET['name'])

{

	$where.=" where name like "%$name%"";

}



//当id有值的时候

sql=select * from tb1 where id like "%$id%"

//当name有值的时候

sql=select * from tb1 where name like "%$name%"



//当同时又值的时候，sql就出错了

sql=select * from tb1 where name like "%$name%" where where id like "%$id%" 



//当然你可以说用

if($id=$_GET['id']&&$name=$_GET['name'])

{

	where.= "and";

}

分享到：

$where = array();

foreach($_GET as $k=>v) $where[] = "$k like '%$v%'";

$sql="select * from tb1";

if($where) $sql .= ' where ' . join(' and ', $where);

$sql="select * from tb1";

$where = array();

if($id=$_GET['id'])

{

    $where[]=" id like '%$id%'";

}

if($name=$_GET['name'])

{

    $where[]=" name like '%$name%'";

}



$s=(!empty($where)) ? " where " . implode(" and " , $where) : '';

$sql.=$s;

$sql="select * from tb1 where 1=1";

if($id=$_GET['id']) $sql.=" and id like "%$id%"";

if($name=$_GET['name']) $sql.=" and name like "%$name%"";