Appendix

XML Schemas

本附录的这一部分列出了 XML 模式以进行数据访问，包括以下内容：

This part of the appendix lists XML schemas for data access, including the following:

The tx Schema

tx 标签用于配置 Spring 对事务的全面支持中的所有那些 bean。这些标签在题为 Transaction Management 的章节中进行了介绍。

The tx tags deal with configuring all of those beans in Spring’s comprehensive support for transactions. These tags are covered in the chapter entitled Transaction Management.

我们强烈建议你查看 Spring 发行版附带的 ’spring-tx.xsd'` 文件。该文件包含 Spring 事务配置的 XML Schema，涵盖了 tx 命名空间中的所有元素，包括属性默认值和类似信息。此文件采用内联方式记录，因此，根据遵守 DRY（不重复自己）原则的利益，此处不会重复该信息。

We strongly encourage you to look at the ’spring-tx.xsd'` file that ships with the Spring distribution. This file contains the XML Schema for Spring’s transaction configuration and covers all of the various elements in the tx namespace, including attribute defaults and similar information. This file is documented inline, and, thus, the information is not repeated here in the interests of adhering to the DRY (Don’t Repeat Yourself) principle.

为了完整起见，若要使用 tx 模式中的元素，你需要在 Spring XML 配置文件顶部拥有下列前导部分。以下代码片段中的文本引用了正确的模式，以便向你提供 tx 命名空间中的标记：

In the interest of completeness, to use the elements in the tx schema, you need to have the following preamble at the top of your Spring XML configuration file. The text in the following snippet references the correct schema so that the tags in the tx namespace are available to you:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:tx="http://www.springframework.org/schema/tx" 1
	xmlns:aop="http://www.springframework.org/schema/aop"
	xsi:schemaLocation="
		http://www.springframework.org/schema/beans
		https://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/tx
		https://www.springframework.org/schema/tx/spring-tx.xsd 2
		http://www.springframework.org/schema/aop
		https://www.springframework.org/schema/aop/spring-aop.xsd">

	<!-- bean definitions here -->

</beans>
1 Declare usage of the tx namespace.
2 Specify the location (with other schema locations).

通常，在使用 tx 命名空间中的元素时，你还会使用 aop 命名空间中的元素（因为 Spring 中的声明式事务支持是使用 AOP 实现的）。前面的 XML 片段包含引用 aop 模式以便向你提供 aop 命名空间中的元素所需的相关文章。

Often, when you use the elements in the tx namespace, you are also using the elements from the aop namespace (since the declarative transaction support in Spring is implemented by using AOP). The preceding XML snippet contains the relevant lines needed to reference the aop schema so that the elements in the aop namespace are available to you.

The jdbc Schema

jdbc 元素使你能够快速配置嵌入式数据库或初始化现有数据源。这些元素分别在 Embedded Database Support 和 Initializing a DataSource 中进行了记录。

The jdbc elements let you quickly configure an embedded database or initialize an existing data source. These elements are documented in Embedded Database Support and Initializing a DataSource, respectively.

若要使用 jdbc 模式中的元素，你需要在 Spring XML 配置文件顶部拥有下列前导部分。以下代码片段中的文本引用了正确的模式，以便向你提供 jdbc 命名空间中的元素：

To use the elements in the jdbc schema, you need to have the following preamble at the top of your Spring XML configuration file. The text in the following snippet references the correct schema so that the elements in the jdbc namespace are available to you:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:jdbc="http://www.springframework.org/schema/jdbc" 1
	xsi:schemaLocation="
		http://www.springframework.org/schema/beans
		https://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/jdbc
		https://www.springframework.org/schema/jdbc/spring-jdbc.xsd"> 2

	<!-- bean definitions here -->

</beans>
1 Declare usage of the jdbc namespace.
2 Specify the location (with other schema locations).