MySQL 使用 JSON 数组作为值时的语法错误

Question

我的Table:

customer_id INT（主键）
purchased_products JSON
refunded_products = JSON

预期值

12345
["32","33","34"]
["31","38","39"]

以下 SQL 按预期工作。太棒了！

 -- Insert a new row into the purchased products table
INSERT INTO dc_purchased_products (
    user_id, -- INT
    purchased_products -- JSON
)

-- 1) The user ID (primary key)
-- 2) Formatted json array with the first purchased product ID
VALUES ( 12345, '["36"]' )

-- If the user id already exists, append the existing array with the product ID
ON DUPLICATE KEY UPDATE 

-- JSON_ARRAY_INSERT(existing purchases array, index, product_id)
purchased_products = JSON_ARRAY_INSERT(purchased_products, '$[0]', "36")

但是，我的应用程序中的 PDO 声明不是很好。

$item = [
  'statement' => "INSERT INTO purchased_products 
                        (customer_id, purchased_products) 
                  VALUES(:customer_id, [:purchased_products]) 
                    ON DUPLICATE KEY 
                    UPDATE purchased_products = JSON_ARRAY_INSERT(purchased_products, '$[0]',:purchased_products)",
  'data' => [
    ['customer_id' => 12345, 'purchased_products' => '"36"'],
    ['customer_id' => 12345, 'purchased_products' => '"37"']
  ]
]

我的连接

$this->connection = new PDO("mysql:host=$servername;dbname=$database", $u, $p, [
  PDO::MYSQL_ATTR_SSL_KEY                => $ck,
  PDO::MYSQL_ATTR_SSL_CERT               => $cc,
  PDO::MYSQL_ATTR_SSL_CA                 => $sc,
  PDO::MYSQL_ATTR_SSL_VERIFY_SERVER_CERT => false,
]);

$this->connection->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);


$statement = $this->connection->prepare($item['statement']);
foreach ($item['data'] as $rowData) {

    foreach ($rowData as $key => $param) {
        $statement->bindValue(':' . $key, $param);
    }

    try {
        $success = $statement->execute();
    }

    catch (PDOException $e) {
        pre($e->getMessage());        
    }

}

错误信息

SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '['3784835']) ON DUPLICATE KEY UPDATE purchased_products = JSON_ARRAY_INSERT(purc' at line 1

Answer 1

这应该可以解决问题：

$item = [
  'statement' => "INSERT INTO purchased_products 
                        (customer_id, purchased_products) 
                  VALUES(:customer_id, :purchased_products) 
                    ON DUPLICATE KEY 
                    UPDATE purchased_products = JSON_ARRAY_INSERT(purchased_products, '$[0]',:purchased_products_json)",
  'data' => [
    ['customer_id' => 12345, 'purchased_products' => '["36"]', 'purchased_products_json' => '36'],
    ['customer_id' => 12345, 'purchased_products' => '["37"]', 'purchased_products_json' => '37'],
  ]
];

更改说明：

在 VALUES(:customer_id, [:purchased_products])

中删除了 [ 和 ]

现在看起来像这样：

VALUES(:customer_id, :purchased_products)

此更改将避免 execute() 期间的错误。

JSON_ARRAY_INSERT 中的新参数：purchased_products_json

现在看起来像这样：

JSON_ARRAY_INSERT(purchased_products, '$[0]',:purchased_products_json)

为了避免这个错误，我们现在需要两个差异很小的参数。一个用于插入 (purchased_products)，另一个用于更新 (purchased_produtcs_json)，因为尽管值相同，但格式不同。

在data数组中，改为'purchased_products' => '"36"'

现在看起来像这样：

'purchased_products' => '["36"]'

因为我们将在 INSERT 语句中使用它，我们需要将其设置为具有正确格式的新 JSON 数组值，并且因为我们已经删除了 [ 和 ]之前的 INSERT 语句。

在data数组中，添加了新参数：'purchased_products_json'

为了更新字段，值格式应该不同，所以我们需要这个新参数。看起来像这样：

'purchased_products_json' => '36'

避免使用 [ 和 ]。您可以在 mariadb documentation

中查看有关 JSON_ARRAY_INSERT 的一些信息

MySQL 使用 JSON 数组作为值时的语法错误

MySQL Syntax Error when using JSON array as value

php

mysql

pdo

更改说明：