Send multiple sql query in a while loop

quantum

Hi everyone,

I was wondering if anyone could show me with example how to send multiple sql query to a mysql database? I want to use a while loop for that. And I also would like to have an example showing the sql query in conjunction with, if possible, php syntax.

Thanks.
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tanveer

Hi Qunatum,
Correct me If I am wrong.
Are u looking for something like this:-

Code:

while (condition)
{
$user_query="delete from main where call_number='$call'";
$user_result=mysql_query($user_query);

$sql_avail="delete from book_lending where call_number='$call'";
$sql_query=mysql_query($sql_avail);

$sql_order="delete from book_order where call_number='$call'";
$sql_order=mysql_query($sql_order);
}

quantum

Thanks Tanvir. Yes, it was something like this I was looking for. As I see that the crucial point here is how to make connection to the mysql and fetch the resultset to call. In such cases we CAN make multiple sql queries with a while loop IF everytime the resultset is with a different variable name. Something like this,

Code:

$sql = "SELECT * FROM TABLE";
$result = mysql_query($sql,$db_link);
while ($row = mysql_fetch_array($result){
$sql = "SELECT * FROM TABLE2 WHERE TABLE2_ID = '" . $row[0] . "'";
// code here
$result2 = mysql_query($sql,$db_link);
while ($row2 = mysql_fetch_array($result2){
//code here
}
}

However, I have found a more convenient way to do what the while loop is doing here. Joining tables. Cool stuff. Like this,

Allow SELECT a FROM table_name1 LEFT JOIN table_name2 USING (a); in this case a is assumed to come from the table_name1 table.

This example I picked up from the mysql manual:

Code:

CREATE TABLE person (
id SMALLINT UNSIGNED NOT NULL AUTO_INCREMENT,
name CHAR(60) NOT NULL,
PRIMARY KEY (id)
);

CREATE TABLE shirt (
id SMALLINT UNSIGNED NOT NULL AUTO_INCREMENT,
style ENUM('t-shirt', 'polo', 'dress') NOT NULL,
color ENUM('red', 'blue', 'orange', 'white', 'black') NOT NULL,
owner SMALLINT UNSIGNED NOT NULL REFERENCES person(id),
PRIMARY KEY (id)
);

INSERT INTO person VALUES (NULL, 'Antonio Paz');

INSERT INTO shirt VALUES
(NULL, 'polo', 'blue', LAST_INSERT_ID()),
(NULL, 'dress', 'white', LAST_INSERT_ID()),
(NULL, 't-shirt', 'blue', LAST_INSERT_ID());

INSERT INTO person VALUES (NULL, 'Lilliana Angelovska');

INSERT INTO shirt VALUES
(NULL, 'dress', 'orange', LAST_INSERT_ID()),
(NULL, 'polo', 'red', LAST_INSERT_ID()),
(NULL, 'dress', 'blue', LAST_INSERT_ID()),
(NULL, 't-shirt', 'white', LAST_INSERT_ID());

SELECT * FROM person;
+----+---------------------+
| id | name |
+----+---------------------+
| 1 | Antonio Paz |
| 2 | Lilliana Angelovska |
+----+---------------------+

SELECT * FROM shirt;
+----+---------+--------+-------+
| id | style | color | owner |
+----+---------+--------+-------+
| 1 | polo | blue | 1 |
| 2 | dress | white | 1 |
| 3 | t-shirt | blue | 1 |
| 4 | dress | orange | 2 |
| 5 | polo | red | 2 |
| 6 | dress | blue | 2 |
| 7 | t-shirt | white | 2 |
+----+---------+--------+-------+

SELECT s.* FROM person p, shirt s
WHERE p.name LIKE 'Lilliana%'
AND s.owner = p.id
AND s.color <> 'white';

+----+-------+--------+-------+
| id | style | color | owner |
+----+-------+--------+-------+
| 4 | dress | orange | 2 |
| 5 | polo | red | 2 |
| 6 | dress | blue | 2 |
+----+-------+--------+-------+

_________________

Dust fills my eyes / Clouds roll by / and I roll with them / Centuries cry / Orders fly / and I fall again
Afford best design, implement best solution. Outsource your web design.

Last edited by quantum on Sun Aug 22, 04 8:17 am; edited 1 time in total

tanveer

hey, thanks goes to u bcz thatz a very useful piece of code indeed. I always overlooked these join portion and the code I post is one of my projects which I will now try to implement with this join. Gentle smile