我不得不在一个表中插入超过 14000 行,发现使用 Mysqli 准备好的语句的每一行花费了十多分钟,而使用相同 Mysqli 准备好的语句的字符串参数的参数解包在不到 10 秒的时间内完成。我的数据非常重复,因为它是 id 的倍数和一个常量整数。
10分钟代码:
$num = 1000;
$ent = 4;
$value = ['id' => 1,
'id' => 2,
'id' => 3,
'id' => 4,
'id' => 5,
'id' => 6,
'id' => 7,
'id' => 8,
'id' => 9,
'id' => 10,
'id' => 11,
'id' => 12,
'id' => 13,
'id' => 14];
$cnt = 0;
$query = "INSERT INTO table (col1, col2) VALUES (?,?)";
$stmt = $this->db->prepare($query);
$stmt->bind_param('ii', $arg_one,$arg_two);
foreach ($value as $k => $val) {
for ($i=0; $i < $num; $i++) {
$arg_one = $k;
$arg_two = $ent;
if($stmt->execute()) {
$cnt++;
}
}
}
10 秒代码:
$ent = 4;
$num = 1000;
$value = ['id' => 1,
'id' => 2,
'id' => 3,
'id' => 4,
'id' => 5,
'id' => 6,
'id' => 7,
'id' => 8,
'id' => 9,
'id' => 10,
'id' => 11,
'id' => 12,
'id' => 13,
'id' => 14];
$newdat = [];
foreach ($value as $k => $val) {
for ($i=0; $i < $num; $i++) {
$newdat[] = $val;
$newdat[] = $ent;
}
}
// create string of data types
$cnt = count($newdat);
$param = str_repeat('i',$cnt);
// create string of question marks
$rec = (count($newdat) == 0) ? 0 : $cnt / 2 - 1;
$id_q = str_repeat('(?,?),', $rec) . '(?,?)';
// insert
$query = "INSERT INTO table (col1, col2) VALUES $id_q";
$stmt = $db->prepare($query);
$stmt->bind_param($param, ...$newdat);
$stmt->execute();