PHP? ??? MySQL ?? ??
PHP??? ?? ???? ?? MySQL ??? ???? ?? ??? ? ????. ? ????? ???? ??? ?? ?? ?? ?? ???? ??? ???? ?? ???? ??? ????.
?? ?? ??? ??? ??? ???? ?? ?? ??? ??????. ??? ?? ?? ??? ????? ?? ??? ?? ?????. ? ??? ???? ?? PHP? ??? ??? ??? ? ?? mysqli_multi_query() ??? ?????.
??? ?? ?? ?????.
/* Create database connection */
$link = mysqli_connect("server", "user", "password", "database");
$query = "CREATE VIEW current_rankings AS SELECT * FROM main_table WHERE date = X;";
$query .= "CREATE VIEW previous_rankings AS SELECT rank FROM main_table WHERE date = date_sub('X', INTERVAL 1 MONTH);";
$query .= "CREATE VIEW final_output AS SELECT current_rankings.player, current_rankings.rank as current_rank LEFT JOIN previous_rankings.rank as prev_rank ON (current_rankings.player = previous_rankings.player);";
$query .= "SELECT *, @rank_change = prev_rank - current_rank as rank_change from final_output;";
/* Execute multiple queries using mysqli_multi_query() */
if (mysqli_multi_query($link, $query)) {
do {
/* Store current result set */
if ($result = mysqli_store_result($link)) {
while ($row = mysqli_fetch_array($result)) {
echo $row['player']. $row['current_rank']. $row['prev_rank']. $row['rank_change'];
}
mysqli_free_result($result);
}
} while (mysqli_next_result($link));
}
? ?? ??? ?? ??? ??? ??? ?????. ?? ???? ??? ?????. mysqli_multi_query() ??? ????? ???? TRUE? ?????.
?? ??? ?? ??? ??? ?? ????(;)? ?? ??? ???? $query ???? ??? ? ????. ? ?? ??? mysqli_store_result()? ???? ??? ??? ???? ?? ??? mysqli_fetch_array()? ???? ??? ? ????.
?? mysqli_query() ??? ???? ??? ??? ??? ?? ????.
$query1 = "Create temporary table A select c1 from t1";
$result1 = mysqli_query($link, $query1) or die(mysqli_error());
$query2 = "select c1 from A";
$result2 = mysqli_query($link, $query2) or die(mysqli_error());
while($row = mysqli_fetch_array($result2)) {
echo $row['c1'];
}
? ?? ??? ???? ?? ?? ? ?? ??? ? ????? ??? ? ????.
? ??? PHP?? ?? MySQL ??? ????? ???? ??? ??????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!
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