当我获取数据并将其插入表中时查询不起作用

Question

I am trying to insert to another table the results of a select statement from another table. The select statement works but the insert statement does not work. Please help me.

$query="SELECT * FROM subject WHERE sub_code = '$enrol' ";
$result = mysql_query($query);

while($row = mysql_fetch_array($result)) {
  $csubject=$row['sub_name'];
  $cday=$row['sub_day'];
  $ctime=$row['sub_time'];

  echo "<strong>". $csubject . "</strong>";
}

$query = mysql_query("INSERT INTO client (client_csub_code,client_csub_name,client_csub_day,client_csub_time) VALUES ('$enrol','$csubject','$cday','$ctime')");

header("Location:homeclient.php");
?> 

Answer 1

You asked for how to do these two as one query.

This is how:

$query = mysql_query("INSERT INTO `client` ( `client_csub_code`, `client_csub_name`, `client_csub_day`, `client_csub_time` ) SELECT `sub_code`, `sub_name`, `sub_day`, `sub_time` FROM `subject` WHERE `code` = '$enrol'");

// I would also add error checking
if ( mysql_errno() )
    echo mysql_error();

Answer 2

$query="SELECT * FROM subject WHERE sub_code = '$enrol' ";
$result = mysql_query($query);

while($row = mysql_fetch_array($result)) {
  $csubject=$row['sub_name'];
  $cday=$row['sub_day'];
  $ctime=$row['sub_time'];

  echo "<strong>". $csubject . "</strong>";
  $query = mysql_query("INSERT INTO client (client_csub_code,client_csub_name,client_csub_day,client_csub_time) VALUES ('$enrol','$csubject','$cday','$ctime')");
}   
header("Location:homeclient.php");
?> 

Try changing to this. Currently your query is outside of your while, it will only run once and the values of $csubject etc are always going to be the last values of your fetched results.