[英]How to retrieve data from multiple tables using a PHP form?
我想使用點運算符/聯接從多個表中檢索數據,其中參數是從HTML / PHP表單傳遞的。
HTML代碼
<input name="rollno" type="text" placeholder="Roll Number" required>
<input name="submit_view_details" type="submit" value="Proceed">
PHP代碼
if(isset($_POST['submit_view_details']))
{
$rollno = (int) $_POST['rollno'];
$query = "select * from table1, table2 where table1.{$rollno}=table2.{$rollno}";
$result=mysqli_query($connection,$query);
}
在瀏覽器中,如果輸入輸入1
並回顯此查詢,則如下所示:
select * from table1, table2 where table1.1=table2.1
並且即使表中有數據,也不會獲取任何行。
它僅在查詢如下所示時有效:
select * from table1,table2 where table1.rollno=table2.rollno
但是,在那種情況下,它獲取所有行,但是我只需要用戶以上述形式輸入的rollno行。
我只是無法解決這個問題。 幫助將不勝感激。 謝謝!
使用AND關鍵字指定rollno。
SELECT * FROM table1, table2 WHERE table1.rollno = table2.rollno
AND table1.rollno = {$rollno};
您可能會像這樣使用關鍵字JOIN :
SELECT * FROM table1 NATURAL JOIN table2
WHERE rollno = {$rollno};
您應該像這樣使用join
$query = "SELECT tbl1.*, tbl2.*
FROM tbl1
INNER JOIN tbl2 ON tbl1.id = tbl2.id
WHERE tbl1.column = value ";
foreach ($pieces_2 AS $value) {
$pieces_3[] ="(CONCAT_WS('|',$presql2) like '%$value%')"; //concat all columns from one table
}
$serch_jyouken = implode(" and ",$pieces_3); // for multiple keywords
$result1 = mysqli_query($connection, "select p.p_no from pfr_data p where (" .$serch_jyouken .")");
$res1 = array();
while($r1 = mysqli_fetch_array($result1){
$res1[] = $r1['p_no'] ; //fetch primary key from table and store it into array
}
foreach ($pieces_2 AS $value) {
$pieces_4[] ="(CONCAT_WS('|',$presql3) like '%$value%')"; // same as above
}
$serch_jyouken1 = implode(" and ",$pieces_4);
$result2 = mysqli_query($connection, "select p2.p_no from pfr_mod_inform p2 where (" .$serch_jyouken1 .")" );
$res2 = array();
while($r2 = mysqli_fetch_array($result2)){
$res2[] = $r2['p_no'];
}
$res_mrg = array_merge($res1 , $res2); //merge array
$result = implode("','",$res_mrg ); // array to sring
$sql5 = $presql ." from pfr_data p where p.p_no in ('$result') order by p.section_p,p.status,p.no";
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