php - 如何生成 MySQL INSERT 语句以使用数组中的多行填充表

Posted 2023-03-15

【中文标题】php - 如何生成 MySQL INSERT 语句以使用数组中的多行填充表

【英文标题】：php - How to generate MySQL INSERT statements to populate a table with multiple rows from array

【发布时间】：2021-07-20 23:09:04

【问题描述】：

我已读入一个 CSV 文件，其中包含超过 4000 行的配方数据。索引 7 是诸如“早餐”、“素食主义者”等类别。我将在 mysql 中在食谱及其类别之间创建多对多表，但首先我为类别表生成 INSERT 语句。我需要删除重复值（其中有很多），并使用array_unique() 成功完成了这项工作。

我正在生成插入语句，而不是直接将数据放入我的数据库，因为我仍然不确定自己在做什么。

这是我的代码：

<?php
 
include("connection.php");
 
 
$file = "recipes.csv";
$categories = array();
 
if (file_exists($file)) 
 
    $filepath = fopen($file, "r");

    while( ($line = fgetcsv($filepath)) !== FALSE )

        $categories[] = $line[7];


        $categories = array_unique($categories);
        $catstr = implode(" , ",$categories);

        echo "INSERT INTO category (categoryname) VALUES ('".$catstr."')";
        
        echo "<br>";
    

我不确定是否使用 implode 函数，也许我用错了。

这是输出：

INSERT INTO category (categoryname) VALUES ('European , Dessert')
INSERT INTO category (categoryname) VALUES ('European , Dessert , < 30 Mins')
INSERT INTO category (categoryname) VALUES ('European , Dessert , < 30 Mins , Steak')
INSERT INTO category (categoryname) VALUES ('European , Dessert , < 30 Mins , Steak , Chicken Breast')
INSERT INTO category (categoryname) VALUES ('European , Dessert , < 30 Mins , Steak , Chicken Breast , Lunch/Snacks')
INSERT INTO category (categoryname) VALUES ('European , Dessert , < 30 Mins , Steak , Chicken Breast , Lunch/Snacks , Breakfast')
INSERT INTO category (categoryname) VALUES ('European , Dessert , < 30 Mins , Steak , Chicken Breast , Lunch/Snacks , Breakfast')
INSERT INTO category (categoryname) VALUES ('European , Dessert , < 30 Mins , Steak , Chicken Breast , Lunch/Snacks , Breakfast , Candy')
INSERT INTO category (categoryname) VALUES ('European , Dessert , < 30 Mins , Steak , Chicken Breast , Lunch/Snacks , Breakfast , Candy , Ice Cream')
INSERT INTO category (categoryname) VALUES ('European , Dessert , < 30 Mins , Steak , Chicken Breast , Lunch/Snacks , Breakfast , Candy , Ice Cream')
INSERT INTO category (categoryname) VALUES ('European , Dessert , < 30 Mins , Steak , Chicken Breast , Lunch/Snacks , Breakfast , Candy , Ice Cream')
INSERT INTO category (categoryname) VALUES ('European , Dessert , < 30 Mins , Steak , Chicken Breast , Lunch/Snacks , Breakfast , Candy , Ice Cream , Chicken')
INSERT INTO category (categoryname) VALUES ('European , Dessert , < 30 Mins , Steak , Chicken Breast , Lunch/Snacks , Breakfast , Candy , Ice Cream , Chicken , Gelatin')
INSERT INTO category (categoryname) VALUES ('European , Dessert , < 30 Mins , Steak , Chicken Breast , Lunch/Snacks , Breakfast , Candy , Ice Cream , Chicken , Gelatin')
INSERT INTO category (categoryname) VALUES ('European , Dessert , < 30 Mins , Steak , Chicken Breast , Lunch/Snacks , Breakfast , Candy , Ice Cream , Chicken , Gelatin , Meat')
INSERT INTO category (categoryname) VALUES ('European , Dessert , < 30 Mins , Steak , Chicken Breast , Lunch/Snacks , Breakfast , Candy , Ice Cream , Chicken , Gelatin , Meat , Sauces')
INSERT INTO category (categoryname) VALUES ('European , Dessert , < 30 Mins , Steak , Chicken Breast , Lunch/Snacks , Breakfast , Candy , Ice Cream , Chicken , Gelatin , Meat , Sauces , Low Protein')
INSERT INTO category (categoryname) VALUES ('European , Dessert , < 30 Mins , Steak , Chicken Breast , Lunch/Snacks , Breakfast , Candy , Ice Cream , Chicken , Gelatin , Meat , Sauces , Low Protein , < 15 Mins')
INSERT INTO category (categoryname) VALUES ('European , Dessert , < 30 Mins , Steak , Chicken Breast , Lunch/Snacks , Breakfast , Candy , Ice Cream , Chicken , Gelatin , Meat , Sauces , Low Protein , < 15 Mins')
INSERT INTO category (categoryname) VALUES ('European , Dessert , < 30 Mins , Steak , Chicken Breast , Lunch/Snacks , Breakfast , Candy , Ice Cream , Chicken , Gelatin , Meat , Sauces , Low Protein , < 15 Mins')
INSERT INTO category (categoryname) VALUES ('European , Dessert , < 30 Mins , Steak , Chicken Breast , Lunch/Snacks , Breakfast , Candy , Ice Cream , Chicken , Gelatin , Meat , Sauces , Low Protein , < 15 Mins , Cheesecake')
INSERT INTO category (categoryname) VALUES ('European , Dessert , < 30 Mins , Steak , Chicken Breast , Lunch/Snacks , Breakfast , Candy , Ice Cream , Chicken , Gelatin , Meat , Sauces , Low Protein , < 15 Mins , Cheesecake')

....等等。

我的代码显然会为每个原始索引值输出一些内容，并在每次迭代时输出所有先前的类别值。

我需要它做什么：

INSERT INTO category (categoryname) VALUES ('European')
INSERT INTO category (categoryname) VALUES ('Dessert')
INSERT INTO category (categoryname) VALUES ('< 30 Mins')
INSERT INTO category (categoryname) VALUES ('Steak')
INSERT INTO category (categoryname) VALUES ('Chicken Breast')
INSERT INTO category (categoryname) VALUES ('Lunch/Snacks')
INSERT INTO category (categoryname) VALUES ('Breakfast')

etc

任何帮助将不胜感激。

【问题讨论】：

为什么不分享文件的摘录（例如前 5 行、中间 5 行和最后 5 行）

【参考方案1】：

你正在寻找的是这样的：

<?php
$db = new \PDO($dsn, $username, $password, $options);
$file = "recipes.csv";

if (file_exists($file)) 
    $stmt = $db->prepare("INSERT INTO category SET categoryname = ?");
    $filepath = fopen($file, "r");

    while(($line = fgetcsv($filepath)) !== false) 
        $categories[] = $line[7];
    
    $categories = array_unique($categories);
    foreach ($categories as $cat) 
        $stmt->execute([$cat]);
    

首先循环遍历 CSV，以便获取唯一值，然后使用准备好的语句依次插入每个值。这假设您使用的是 PDO，显然需要添加一些错误检查代码。

【讨论】：

您好，感谢您的回复。我正在使用 MySQLi

你不应该这样。如果你想继续，这里有很多关于如何用它做准备好的陈述的材料。

【参考方案2】：

添加每一行的最后一个元素并不是很复杂。因为每次类别都是唯一的，并且最后一个元素被定义为每一行的新类别

<?php
 
// include("connection.php");
 
 
$file = "recipes.csv";
$categories = array();
 
if (file_exists($file)) 
 
    $filepath = fopen($file, "r");

    while( ($line = fgetcsv($filepath)) !== FALSE )

        $cat =end($line);
        echo "INSERT INTO category (categoryname) VALUES ('". $cat."')";
        
        echo "<br>";