getMessage();
exit();
}
static::$instance->setAttribute(\PDO::MYSQL_ATTR_USE_BUFFERED_QUERY, false);
}
public static function getInstance()
{
if (!(static::$instance instanceof \PDO)) {
new static();
}
return static::$instance;
}
public static function excuteQuery(string $sql)
{
static::$sth = static::$instance->prepare($sql);
static::$sth->execute();
}
//防止实例被克隆
private function __clone()
{
}
public static function cursor()
{
while ($row = static::$sth->fetch(\PDO::FETCH_ASSOC)) {
yield $row;
}
}
}
DB::getInstance();
DB::excuteQuery("select * from bill_info");
foreach (DB::cursor() as $info) {
echo $info['id'] . PHP_EOL;
}
当前题目:PHP量级数据遍历方案:yield生成器
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