Sort the table "sql:select results query" to appear in sequence of the array $x[], wh

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December 26th, 2008, 05:09 PM

lse123

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MySQL 5 - Sort the table "sql:select results query" to appear in sequence of the array $x[], wh

If I have an array created on runtime dynamically[php] like $x[5]=[2,4,3,1,5] and a database table in mysql with PK values starting from 1 to 5 , and I want to sort the table "sql:select results query" to appear in sequence of the array $x[], what process I must follow ????
first 2 row, after 4 row, after 3 row, after 1 row, and last 5 row, in this array dynamic generation ....

December 26th, 2008, 05:26 PM

IAmALlama

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you can use the mysql field() function to do this. the first argument would be a column name and the next arguments are a list of values. field returns the index (position) of the first argument in the rest of the arguments. so for example if column ID is equal to 5 then:

Code:

SELECT FIELD(ID, 5, 4, 1, 3, 2, 6)
//would return 1 because id=5 which is the
//1st argument after the column.
SELECT FIELD(ID, 4,2,3,1,7,8,6,5)
//would return 8 because 5 is the 8th number in the list.

using this, you can order by your custom list using the return value from field to sort.

PHP Code:


		
			
//the order you want to sort in an array

$sortArray = array(5,4,1,2,3);

//turn that array into a string for use in the query.

$sortString = implode(',', $sortArray);



$query = "SELECT * FROM TableName ORDER BY FIELD(ID,$sortString)";

echo "your query is: $query<br />";

$result = mysql_query($query) or die("There was an error: ".mysql_error());

echo "the result is:<br /><pre>";

while($row = mysql_fetch_array($result)){

    print_r($row);

}

just a warning too, if the column you are trying to sort is not in the list of arguments, then field will return 0 meaning it will be at the top of the list. if you want it to be at the bottom, then reverse the array order and sort desc.

January 3rd, 2009, 04:39 AM

lse123

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is needed the array element if are 5 to be 1,5,4,2,3 ? can be

is needed the array element if are 5 to be 1,5,4,2,3 ? can be 9,5,2,6,13 ?

what if I have an array of 6, 9, 8,1,5 booking id, and I want corresponding names of customers to booking id used elsewhere (get values) what do ?

I can NOT use multiple
foreach ($_POST['c'] as $n) { // $_POST['c']=array bookingid
$query[$n]="SELECT * FROM BOOKINGS WHERE bookingid='".$n."'";
}

what use then ?

January 3rd, 2009, 04:45 AM

lse123

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In less words what do if SELECT...WHERE bookingid=array[]; ?

In less words what do if SELECT...WHERE bookingid=array[]; ?

January 3rd, 2009, 03:58 PM

IAmALlama

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you can use the 'IN' keyword.

Code:

SELECT * FROM SomeTable WHERE ID IN (4,5,1,3,2,13)

its just where column IN ('comma', 'separated', 'list', 'of', 'values').

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