Question

仅在$ i = 0时有效;

<?php   
        include 'db.php';
        $con = new db();
        $db = $con->getConnection();
            $i = 0;
        while($i <= 10){
            $query = "call rep_summary('$date')";
            $result = $db->query($query);
            while ($data = $result->fetch_assoc()) {
                $user = $data['username'];
                $id = $data['id'];
                echo $user;
                }

            $i++;
        }
        $db->close();

    ?>

以下代码工作正常，但需要花费太多时间，因此我想重用连接

<?php   
   include 'db.php';

   $i = 0;
    while($i <= 10){
        $con = new db();
        $db = $con->getConnection();
        $query = "call rep_summary('$date')";
        $result = $db->query($query);
        while ($data = $result->fetch_assoc()) {
            $user = $data['username'];
            $id = $data['id'];
            echo $user;
            }

        $i++;

    }
$db->close();

?>

和db class

<?php

class db {

    var $_host = "localhost";
    var $_user = "root";
    var $_password = "";
    var $_database = "test";
    var $db;

    public function __construct() {
        $this->db = new mysqli($this->_host, $this->_user, $this->_password, $this->_database);
        $this->db->set_charset("utf8");
    }

    public function getConnection() {
        if ($this->db->connect_errno > 0) {
            die('Unable to connect to database [' . $this->db->connect_error . ']');
        }
        return $this->db;
    }

}

如何在单个连接中执行查询

Answer 1

你应该在循环之外实例化db对象，并在以下之后关闭它：

$con = new db();
$i = 0;
while($i <= 10){       
    $db = $con->getConnection();
    $query = "call rep_summary('$date')";
    $result = $db->query($query);
    while ($data = $result->fetch_assoc()) {
        $user = $data['username'];
        $id = $data['id'];
        echo $user;
        }
    $i++;    
}
$db->close();

Answer 2

尝试移动数据库连接并关闭while循环外的函数。您可以在同一连接上执行多个查询。

include 'db.php';
$con = new db();
$db = $con->getConnection();
$date = date('Y-m-d');
   $i = 0;
    while($i <= 10){

        $query = "call rep_summary('$date')";
        $result = $db->query($query);
        while ($data = $result->fetch_assoc()) {
            $user = $data['username'];
            $id = $data['id'];
            echo $user;
            }

        $i++;
    }
$db->close();

如何使用PHP在mysqli Connection中多次执行查询

2 个答案: