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>
/// 数据库联接是否定义
/// </summary>
/// <param name="name"></param>
public static bool ConnectionNameIsConfiged(string name)
{
ExceptionHelper.CheckStringIsNullOrEmpty(name, "name");
ConnectionStringElement settings = GetConfiguration(name);
return(settings != null);
}
/// <summary>
/// 获取指定连接的DbProviderFactory对象(Added by Shen Zheng)
/// </summary>
/// <param name="name"></param>
/// <returns></returns>
internal static DbProviderFactory GetDbProviderFactory(string name)
{
ExceptionHelper.CheckStringIsNullOrEmpty(name, "name");
ConnectionStringElement elem = GetConfiguration(name);
if (elem == null)
{
throw new ConfigurationErrorsException(string.Format(Resource.CanNotFindConnectionName, name));
}
return(DbProviderFactories.GetFactory(elem.ProviderName));
}
/// <summary>
/// 根据数据库逻辑名称获得连接实例
/// </summary>
/// <param name="name">数据库逻辑名称</param>
/// <returns>数据库连接实例</returns>
internal static DbConnection GetConnection(string name)
{
ExceptionHelper.CheckStringIsNullOrEmpty(name, "name");
ConnectionStringElement settings = GetConfiguration(name);
if (settings == null)
{
throw new ConfigurationErrorsException(string.Format(Resource.CanNotFindConnectionName, name));
}
DbConnection dbConnection = DbProviderFactories.GetFactory(settings.ProviderName).CreateConnection();
dbConnection.ConnectionString = settings.ConnectionString;
return(dbConnection);
}