private static ConnectionStringElement GetConfiguration(string name)
{
ConnectionManagerConfigurationSection section =
ConnectionManagerConfigurationSection.GetConfig();
ConnectionStringConfigurationElement configElement = section.ConnectionStrings[name];
ConnectionStringElement element = null;
// 本地配置文件的连接串采用优先级高于Meta库中的
if (configElement != null)
{
element = new ConnectionStringElement();
element.ConnectionString = configElement.ConnectionString;
element.ProviderName = configElement.ProviderName;
element.EventArgsType = configElement.EventArgs.Type;
element.Name = configElement.Name;
element.CommandTimeout = configElement.CommandTimeout;
}
else
{
// 备选通道是从Meta库获取
MetaConnectionStringConfigurationElement metaElement = section.MetaConnectionString;
if (metaElement != null)
{
element = metaElement.GetConnectionStringElement(name);
}
}
return(element);
}
/// <summary>
/// 获取配置文件中的数据库连接（ConnectionManager）集合
/// </summary>
/// <returns></returns>
public static ConnectionManagerConfigurationSection GetConfig()
{
ConnectionManagerConfigurationSection section =
(ConnectionManagerConfigurationSection)ConfigurationBroker.GetSection("connectionManager");
ConfigurationExceptionHelper.CheckSectionNotNull(section, "connectionManager");
return(section);
}
/// <summary>
/// 获取指定连接的Database对象
/// </summary>
/// <param name="name">数据库逻辑名称</param>
/// <returns>连接的Database对象</returns>
internal static Database GetDataProvider(string name)
{
string providerName = GetDbProviderName(name);
ConnectionManagerConfigurationSection section = ConnectionManagerConfigurationSection.GetConfig();
DataProviderConfigurationElement configProvider = section.DataProviders[providerName];
//沈峥添加(2008-08-26)，检查dataProvider配置是否正确
ExceptionHelper.FalseThrow <ConfigurationException>(configProvider != null, Resource.CanNotFindProviderName, name, providerName);
return((Database)configProvider.CreateInstance(name));
}