Enterprise Library: Data Access Application Block配置文件分析篇

Enterprise Library提供了Configuration Console配置工具，用来编辑或查看配置文件信息，调用DAAB的应用程序一般会使用Configuration Console工具产生两个文件：App.config(Web.config)和DataConfiguration.config，其中App.config(Web.config)一般有VS.NET添加进来，然后由Configuration Console进行编辑，DataConfiguration.Config则在通过Configuraiton Console编辑App.config(Web.config)配置文件时，默认生成的数据连接配置文件，与App.config(Web.config)在同一目录。

 

App.config文件包含配置元数据，DAAB的配置信息在DataConfiguration.config文件中。如下是App.config示例：

<?xml version="1.0" encoding="utf-8"?>

<configuration>

  <configSections>

    <section name="enterpriselibrary.configurationSettings" type="Microsoft.Practices.EnterpriseLibrary.Configuration.ConfigurationManagerSectionHandler, Microsoft.Practices.EnterpriseLibrary.Configuration, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />

  </configSections>

  <enterpriselibrary.configurationSettings xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" applicationName="Application" xmlns="http://www.microsoft.com/practices/enterpriselibrary/08-31-2004/configuration">

  <configurationSections>

    <configurationSection xsi:type="ReadOnlyConfigurationSectionData" name="dataConfiguration" encrypt="false">

      <storageProvider xsi:type="XmlFileStorageProviderData" name="XML File Storage Provider" path="dataConfiguration.config" />

      <dataTransformer xsi:type="XmlSerializerTransformerData" name="Xml Serializer Transformer">

        <includeTypes />

      </dataTransformer>

    </configurationSection>

  </configurationSections>

  <keyAlgorithmStorageProvider xsi:nil="true" />

  <includeTypes />

</enterpriselibrary.configurationSettings>

</configuration>

上述App.config配置元数据文件包含如下信息：

Configuration Section名称: enterpriselibrary.configurationSettings

Storage Provider: XmlFileStorageProviderData及其配置文件路径dataConfiguration.config

Data Transformer: XmlSerializerTransformerData

 

如下是dataConfiguration.config配置文件：

<?xml version="1.0" encoding="utf-8"?>

<dataConfiguration>

  <xmlSerializerSection type="Microsoft.Practices.EnterpriseLibrary.Data.Configuration.DatabaseSettings, Microsoft.Practices.EnterpriseLibrary.Data, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null">

    <enterpriseLibrary.databaseSettings xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" defaultInstance="Database Instance" xmlns="http://www.microsoft.com/practices/enterpriselibrary/08-31-2004/data">

      <databaseTypes>

        <databaseType name="Sql Server" type="Microsoft.Practices.EnterpriseLibrary.Data.Sql.SqlDatabase, Microsoft.Practices.EnterpriseLibrary.Data, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />

      </databaseTypes>

      <instances>

        <instance name="Database Instance" type="Sql Server" connectionString="Sql Connection String" />

      </instances>

      <connectionStrings>

        <connectionString name="Sql Connection String">

          <parameters>

            <parameter name="database" value="Northwind" isSensitive="false" />

            <parameter name="Integrated Security" value="False" isSensitive="false" />

            <parameter name="User ID" value="sa" isSensitive="false" />

            <parameter name="Password" value="yourpassword" isSensitive="true" />

            <parameter name="server" value="localhost" isSensitive="false" />

          </parameters>

        </connectionString>

      </connectionStrings>

    </enterpriseLibrary.databaseSettings>

  </xmlSerializerSection>

</dataConfiguration>

 

上述配置文件包含如下信息：

数据库类型: SQL Server

Database Server: localhost

Database Name: Northwind

数据库实例名: Database Instance

连接字符串: Sql Connection String

另外，在连接字符串中添加了User ID, Password等属性及其属性值, Integrated Security设置为False。

 

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作者：Rickie Lee (rickieleemail#yahoo.com)

本文参考Microsoft patterns & practices Enterprise Library文档。