JPA从数据库创建实体类

【问题标题】：JPA Creating entity class from databaseJPA从数据库创建实体类
【发布时间】：2016-03-01 04:24:31
【问题描述】：

我正在尝试使用“表中的 JPA 实体”创建类。我已连接到具有以下 SQL 描述的结构或此图像中描述的数据库
它只创建 4 个类，而 2 个不创建
我的数据库有什么问题？

SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";
SET time_zone = "+00:00";


/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8mb4 */;

--
-- Baza danych: `pawww8`
--

-- --------------------------------------------------------

--
-- Struktura tabeli dla tabeli `category`
--

CREATE TABLE IF NOT EXISTS `category` (
  `id` int(10) unsigned NOT NULL,
  `name` varchar(45) COLLATE utf8_polish_ci NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_polish_ci;

-- --------------------------------------------------------

--
-- Struktura tabeli dla tabeli `customer`
--

CREATE TABLE IF NOT EXISTS `customer` (
  `id` int(11) unsigned NOT NULL,
  `name` varchar(45) COLLATE utf8_polish_ci NOT NULL,
  `email` varchar(45) COLLATE utf8_polish_ci NOT NULL,
  `phone` varchar(45) COLLATE utf8_polish_ci NOT NULL,
  `address` varchar(45) COLLATE utf8_polish_ci NOT NULL,
  `city_region` varchar(2) COLLATE utf8_polish_ci NOT NULL,
  `cc_number` varchar(19) COLLATE utf8_polish_ci NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_polish_ci;

-- --------------------------------------------------------

--
-- Struktura tabeli dla tabeli `customer_order`
--

CREATE TABLE IF NOT EXISTS `customer_order` (
  `id` int(10) unsigned NOT NULL,
  `amount` decimal(6,2) NOT NULL,
  `date_created` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `confirmation_number` int(10) unsigned NOT NULL,
  `customer_id` int(10) unsigned NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_polish_ci;

-- --------------------------------------------------------

--
-- Struktura tabeli dla tabeli `customer_order_has_product`
--

CREATE TABLE IF NOT EXISTS `customer_order_has_product` (
  `customer_order_id` int(10) unsigned NOT NULL,
  `product_id` int(10) unsigned NOT NULL,
  `quantity` smallint(5) unsigned NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_polish_ci;

-- --------------------------------------------------------

--
-- Struktura tabeli dla tabeli `product`
--

CREATE TABLE IF NOT EXISTS `product` (
  `id` int(10) unsigned NOT NULL,
  `name` varchar(45) COLLATE utf8_polish_ci NOT NULL,
  `price` decimal(5,2) NOT NULL,
  `description` tinytext COLLATE utf8_polish_ci,
  `last_update` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  `category_id` int(11) unsigned NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_polish_ci;

--
-- Indeksy dla zrzutów tabel
--

--
-- Indexes for table `category`
--
ALTER TABLE `category`
  ADD PRIMARY KEY (`id`);

--
-- Indexes for table `customer`
--
ALTER TABLE `customer`
  ADD PRIMARY KEY (`id`);

--
-- Indexes for table `customer_order`
--
ALTER TABLE `customer_order`
  ADD PRIMARY KEY (`id`),
  ADD KEY `customer_id` (`customer_id`);

--
-- Indexes for table `customer_order_has_product`
--
ALTER TABLE `customer_order_has_product`
  ADD PRIMARY KEY (`customer_order_id`,`product_id`),
  ADD KEY `customer_order_id` (`customer_order_id`),
  ADD KEY `product_id` (`product_id`);

--
-- Indexes for table `product`
--
ALTER TABLE `product`
  ADD PRIMARY KEY (`id`),
  ADD KEY `category_id` (`category_id`),
  ADD KEY `category_id_2` (`category_id`);

--
-- AUTO_INCREMENT for dumped tables
--

--
-- AUTO_INCREMENT dla tabeli `category`
--
ALTER TABLE `category`
  MODIFY `id` int(10) unsigned NOT NULL AUTO_INCREMENT;
--
-- AUTO_INCREMENT dla tabeli `customer`
--
ALTER TABLE `customer`
  MODIFY `id` int(11) unsigned NOT NULL AUTO_INCREMENT;
--
-- AUTO_INCREMENT dla tabeli `customer_order`
--
ALTER TABLE `customer_order`
  MODIFY `id` int(10) unsigned NOT NULL AUTO_INCREMENT;
--
-- Ograniczenia dla zrzutów tabel
--

--
-- Ograniczenia dla tabeli `customer_order`
--
ALTER TABLE `customer_order`
  ADD CONSTRAINT `customer_order_ibfk_1` FOREIGN KEY (`customer_id`) REFERENCES `customer` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
  ADD CONSTRAINT `customer_order_ibfk_2` FOREIGN KEY (`id`) REFERENCES `customer_order_has_product` (`customer_order_id`) ON DELETE CASCADE ON UPDATE CASCADE;

--
-- Ograniczenia dla tabeli `product`
--
ALTER TABLE `product`
  ADD CONSTRAINT `product_ibfk_1` FOREIGN KEY (`category_id`) REFERENCES `category` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
  ADD CONSTRAINT `product_ibfk_2` FOREIGN KEY (`id`) REFERENCES `customer_order_has_product` (`product_id`) ON DELETE CASCADE ON UPDATE CASCADE;

/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;

【问题讨论】：

  • 你说哪些类丢失或没有生成？
  • 我确定您正在使用一些 IDE，因为“表中的 JPA 实体”出现在某处。所以标记你的问题。而JPA没有提供这样的功能……这是IDE的一个功能
  • 他的课程不会在屏幕上以红色下划线显示。它们是产品和客户订单

标签： sql eclipse jpa entity


【解决方案1】：

我重写了我的数据库，它确实创建了正确的类。代码如下。但我完全不知道为什么它拒绝为前一个创建模型

SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";
SET time_zone = "+00:00";


/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8mb4 */;

--
-- Baza danych: `testowa`
--

-- --------------------------------------------------------

--
-- Struktura tabeli dla tabeli `category`
--

CREATE TABLE IF NOT EXISTS `category` (
  `id` int(10) unsigned NOT NULL,
  `name` varchar(45) COLLATE utf8_polish_ci NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_polish_ci;

-- --------------------------------------------------------

--
-- Struktura tabeli dla tabeli `customer`
--

CREATE TABLE IF NOT EXISTS `customer` (
  `id` int(11) unsigned NOT NULL,
  `name` varchar(45) COLLATE utf8_polish_ci NOT NULL,
  `email` varchar(45) COLLATE utf8_polish_ci NOT NULL,
  `phone` varchar(45) COLLATE utf8_polish_ci NOT NULL,
  `address` varchar(45) COLLATE utf8_polish_ci NOT NULL,
  `city_region` varchar(2) COLLATE utf8_polish_ci NOT NULL,
  `cc_number` varchar(19) COLLATE utf8_polish_ci NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_polish_ci;

-- --------------------------------------------------------

--
-- Struktura tabeli dla tabeli `customer_order`
--

CREATE TABLE IF NOT EXISTS `customer_order` (
  `id` int(10) unsigned NOT NULL,
  `amount` decimal(6,2) NOT NULL,
  `date_created` date NOT NULL,
  `confirmation_number` int(10) unsigned NOT NULL,
  `customer_id` int(10) unsigned NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_polish_ci;

-- --------------------------------------------------------

--
-- Struktura tabeli dla tabeli `customer_order_has_product`
--

CREATE TABLE IF NOT EXISTS `customer_order_has_product` (
  `customer_order_id` int(10) unsigned NOT NULL,
  `product_id` int(10) unsigned NOT NULL,
  `quantity` smallint(5) unsigned NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_polish_ci;

-- --------------------------------------------------------

--
-- Struktura tabeli dla tabeli `product`
--

CREATE TABLE IF NOT EXISTS `product` (
  `id` int(10) unsigned NOT NULL,
  `name` varchar(45) COLLATE utf8_polish_ci NOT NULL,
  `price` decimal(5,2) NOT NULL,
  `description` tinytext COLLATE utf8_polish_ci,
  `last_update` date NOT NULL,
  `category_id` int(11) unsigned NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_polish_ci;

--
-- Indeksy dla zrzutów tabel
--

--
-- Indexes for table `category`
--
ALTER TABLE `category`
  ADD PRIMARY KEY (`id`);

--
-- Indexes for table `customer`
--
ALTER TABLE `customer`
  ADD PRIMARY KEY (`id`);

--
-- Indexes for table `customer_order`
--
ALTER TABLE `customer_order`
  ADD PRIMARY KEY (`id`),
  ADD KEY `customer_id` (`customer_id`);

--
-- Indexes for table `customer_order_has_product`
--
ALTER TABLE `customer_order_has_product`
  ADD PRIMARY KEY (`customer_order_id`,`product_id`),
  ADD KEY `product_id` (`product_id`);

--
-- Indexes for table `product`
--
ALTER TABLE `product`
  ADD PRIMARY KEY (`id`),
  ADD KEY `category_id` (`category_id`);

--
-- Ograniczenia dla zrzutów tabel
--

--
-- Ograniczenia dla tabeli `customer_order`
--
ALTER TABLE `customer_order`
  ADD CONSTRAINT `customer_order_ibfk_1` FOREIGN KEY (`customer_id`) REFERENCES `category` (`id`) ON DELETE CASCADE ON UPDATE CASCADE;

--
-- Ograniczenia dla tabeli `customer_order_has_product`
--
ALTER TABLE `customer_order_has_product`
  ADD CONSTRAINT `customer_order_has_product_ibfk_1` FOREIGN KEY (`product_id`) REFERENCES `product` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
  ADD CONSTRAINT `customer_order_has_product_ibfk_2` FOREIGN KEY (`customer_order_id`) REFERENCES `customer_order` (`id`) ON DELETE CASCADE ON UPDATE CASCADE;

--
-- Ograniczenia dla tabeli `product`
--
ALTER TABLE `product`
  ADD CONSTRAINT `product_ibfk_1` FOREIGN KEY (`category_id`) REFERENCES `customer` (`id`) ON DELETE CASCADE ON UPDATE CASCADE;

/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;

【讨论】：

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