Question

我有一个注册表格，公司注册他们的业务以及他们经营的5个地点。公司和地点数据存储在单独的表格中，然后通过第三个关系表相互关联。

这是我的代码，但我不确定如何成功填充关系表。

例如，假设用户提交了id为3的croydon，那么关系表应该看起来像我手动填写的那个，但我找不到自动填充它的方法！

以下是我的表格外观;

公司

地点

关系表（这是一个手动输入）

// IMPORT TO DATABASE
$query = "INSERT INTO partners (partner_id, partner_name, email_address, contact_number, active, street_number, street_name, town_city, postcode, country)

VALUES

(NULL, '".$companyname."', '".$email."', '".$contactnumber."', 'yes', '".$street_number."', '".$street_name."', '".$town_city."', '".$postcode."', '".$country."')";

$connect->query($query);

//INSERT NEW LOCATIONS TO DATABASE

$insert = "INSERT IGNORE INTO locations (location_id, location_name) VALUES (NULL, '".$area1."')";
$insert .= ", (NULL, '".$area2."')";
$insert .= ", (NULL, '".$area3."')";
$insert .= ", (NULL, '".$area4."')";
$insert .= ", (NULL, '".$area5."')";
$insert .= ";";                                                 

if ($connect->query($insert) === TRUE) {

} else {

echo "Error: " . $insert . "<br>" . $connect->error;
}

//RELATE PARTNER TO LOCATIONS

*已解决*

// GET LOCATION ID 1
                                                        $get_location_id_one = "SELECT location_id FROM locations WHERE (location_name = '$area1')";

                                                        if ($location_ids = $connect->query($get_location_id_one)) {
                                                            foreach ($location_ids as $location_id) {
                                                                $location_id1 = $location_id['location_id'];
                                                            }
                                                        } else {
                                                            echo "Error: No Locations<br>";
                                                        }
                                                        // GET LOCATION ID 2
                                                        $get_location_id_one = "SELECT location_id FROM locations WHERE (location_name = '$area2')";

                                                        if ($location_ids = $connect->query($get_location_id_one)) {
                                                            foreach ($location_ids as $location_id) {
                                                                $location_id2 = $location_id['location_id'];
                                                            }
                                                        } else {
                                                            echo "Error: No Locations<br>";
                                                        }
                                                        // GET LOCATION ID 3
                                                        $get_location_id_one = "SELECT location_id FROM locations WHERE (location_name = '$area3')";

                                                        if ($location_ids = $connect->query($get_location_id_one)) {
                                                            foreach ($location_ids as $location_id) {
                                                                $location_id3 = $location_id['location_id'];
                                                            }
                                                        } else {
                                                            echo "Error: No Locations<br>";
                                                        }
                                                        // GET LOCATION ID 4
                                                        $get_location_id_one = "SELECT location_id FROM locations WHERE (location_name = '$area4')";

                                                        if ($location_ids = $connect->query($get_location_id_one)) {
                                                            foreach ($location_ids as $location_id) {
                                                                $location_id4 = $location_id['location_id'];
                                                            }
                                                        } else {
                                                            echo "Error: No Locations<br>";
                                                        }
                                                        // GET LOCATION ID 5
                                                        $get_location_id_one = "SELECT location_id FROM locations WHERE (location_name = '$area5')";

                                                        if ($location_ids = $connect->query($get_location_id_one)) {
                                                            foreach ($location_ids as $location_id) {
                                                                $location_id5 = $location_id['location_id'];
                                                            }
                                                        } else {
                                                            echo "Error: No Locations<br>";
                                                        }

                                                        $insert = "INSERT INTO partners_locations (partners_locations_id, partner_id, location_id) VALUES (NULL, '".$partner_id."', '".$location_id1."')";
                                                        $insert .= ", (NULL, '".$partner_id."', '".$location_id2."')";
                                                        $insert .= ", (NULL, '".$partner_id."', '".$location_id3."')";
                                                        $insert .= ", (NULL, '".$partner_id."', '".$location_id4."')";
                                                        $insert .= ", (NULL, '".$partner_id."', '".$location_id5."')";
                                                        $insert .= ";"; 


                                                        $connect->query($insert);

Answer 1

要将一行插入＆＃34;关系＆＃34;表，您需要从插入partner_id（公？）表的行中分配给partners列的值。

如果该列是AUTO_INCREMENT列...您可以检索使用MySQL LAST_INSERT_ID函数分配的值。

参考：http://dev.mysql.com/doc/refman/5.6/en/information-functions.html#function_last-insert-id

成功插入后，您可以立即运行查询SELECT LAST_INSERT_ID()。大多数数据库扩展都公开了相同的功能，因此您不必使用额外的SQL语句来破坏代码。数据库扩展将处理运行SELECT并返回值。

例如：

mysqli_insert_id

PDO lastInsertId

您可以在INSERT中将检索到的值用于＆＃34;关系＆＃34;表

我强烈建议您使用预备语句和绑定占位符。您发布的代码似乎容易受到SQL注入攻击（将可能不安全的值合并到SQL文本中。）

如果您不使用绑定占位符，则至少应该通过转义函数运行值...

例如，mysqli_real_escape_string

参考：https://www.owasp.org/index.php/SQL_Injection

提交后在SQL / PHP中创建关系时出错

1 个答案: