MySQL查询到数组到MySQL IN查询

Question

I am attempting to make an array of IDs and use that array in another query to make sure the 2nd query results have the same ids that are in the array.

As per the requirements of the rest of my code, I would prefer not to use the join method.

    $topartistsquery = "SELECT main_id FROM pages WHERE catnum = '201' AND top100 = 'y'";
    $result = mysql_query($topartistsquery);
    $topartistarray = array();
    while(($row =  mysql_fetch_assoc($result))) {
        $topartistarray[] = $row['main_id'];
    }
    //print_r($topartistarray);

    $eventquery = mysql_query("SELECT * FROM TNDB_CSV2 WHERE City = '".$city."' AND PCatID = '2' AND PerformerID IN ($topartistarray) AND DateTime >= CURDATE() ORDER BY DateTime LIMIT 3");

Here is the output of the $topartistarray:

Array ( [0] => 28 [1] => 1126 [2] => 47643 [3] => 2769 [4] => 41512 [5] => 1429 [6] => 163 [7] => 48418 [8] => 198 [9] => 3748 [10] => 10161 [11] => 39890 [12] => 14160 [13] => 25407 [14] => 29219 [15] => 36980 [16] => 1860 [17] => 41299 [18] => 342 [19] => 7468 [20] => 33205 [21] => 1564 [22] => 33911 [23] => 15183 [24] => 540 [25] => 974 [26] => 8358 [27] => 30678 [28] => 4804 [29] => 4266 [30] => 517 [31] => 522 [32] => 1550 [33] => 15989 [34] => 930 [35] => 3383 [36] => 26468 [37] => 5560 [38] => 1063 [39] => 2870 [40] => 4055 [41] => 24917 [42] => 46223 [43] => 973 [44] => 334 [45] => 27970 [46] => 27985 [47] => 356 [48] => 6655 [49] => 201 [50] => 1930 [51] => 1069 [52] => 38053 [53] => 397 [54] => 21713 [55] => 53725 [56] => 4941 [57] => 864 [58] => 41904 [59] => 59233 [60] => 53970 [61] => 50875 [62] => 54175 [63] => 56861 [64] => 53317 [65] => 55258 [66] => 823 [67] => 55704 [68] => 59797 [69] => 27866 [70] => 123 [71] => 59749 [72] => 1567 [73] => 34851 [74] => 3399 [75] => 58674 [76] => 59442 [77] => 60334 ) 

Any constructive input is greatly appreciated. Thank you in advance

Answer 1

Try this:

if (isset($topartistarray) and count($topartistarray) {
    $eventquery = mysql_query("SELECT * FROM TNDB_CSV2 WHERE City = '".$city."' AND PCatID = '2' AND PerformerID IN (".implode(",",$topartistarray).") AND DateTime >= CURDATE() ORDER BY DateTime LIMIT 3");
} else {
    $eventquery = false;
}