php reads the mysql database three ways

 
<? 
$dbh = @mysql_connect("localhost:3306","root","000000"); 
/*  Define variables dbh , mysql_connect() The function means join mysql The database , "@" Means to screen error reporting  */ 
if(!$dbh){die("error");} 
/* die() The () function sends the string in parentheses to the browser and interrupts it PHP The program  (Script) . The argument in parentheses is the string to send.  */ 
@mysql_select_db("ok", $dbh); 
/*  choose mysql In the server 1 A database , The database name chosen here is  ok */ 
$q = "SELECT * FROM abc"; 
/*  Define variables q, "SELECT * FROM abc" is 1 a SQL statements , That means read the table abc The data in the  */ 
?> 

< ! --========= == method 1 ========= ===-- >

 
<? 
$rs = mysql_query($q, $dbh); 
/*  Define variables  rs , function mysql_query() mean : Send out  query  Word collusion  MySQL  Do the relevant processing or execution . Due to the php It is executed from right to left  
, so ,rs Is the value of the server run mysql_query() The value returned after the function  */ 
if(!$rs){die("Valid result!");} 
echo "<table>"; 
echo "<tr><td>ID</td><td>Name</td></tr>"; 
while($row = mysql_fetch_row($rs)) echo "<tr><td>$row[0]</td><td>$row[1]</td></tr>"; 
/*  Define the quantity ( An array of )row, And use the while cycle , The data 11 Write out . 
 function mysql_fetch_row() mean : Query the results $rs Single column into array variable . 
$row[0]  and  $row[1]  The position can be changed */ 
echo "</table>"; 
?> 

< ! --========= = method 2 ========= ===-- >

 
<? 
$rs = mysql_query($q, $dbh); 
while($row = mysql_fetch_object($rs)) echo "$row->id $row->name <br />"; 
/* id and name You can switch places  */ 
?> 

< ! --========= = method 3 ========= ===-- >

 
<? 
$rs = mysql_query($q, $dbh); 
while($row = mysql_fetch_array($rs)) echo "$row[id] $row[name] <br />"; 
/* id and name You can switch places  */ 
?> 
<!--=========  methods 3 The fastest  =========--> 
<? 
@mysql_close($dbh); 
/*  Close to the mysql Database connection  */ 
?>