/// <summary>
/// 创建数据库实例。
/// </summary>
/// <param name="serverType">数据服务器类型</param>
/// <param name="connString">数据连接字符串</param>
/// <returns></returns>
public static IDbHelper Create(ServerType serverType, string connString)
{
//检查缓存
string key = serverType.ToString() + "|" + connString;
if (_helperList.ContainsKey(key))
{
return(_helperList[key].CloneNew());
}
//反射实例化对象
string className = GetInstanceClassName(serverType) + "Helper";
Assembly ass = Assembly.GetExecutingAssembly();
IDbHelper helper = ass.CreateInstance(className, false, BindingFlags.Default, null, new object[] { serverType, connString }, null, null) as IDbHelper;
if (helper == null)
{
throw new DataObjectException("未能实例化数据库 Helper 对象！");
}
if (!_helperList.ContainsKey(key))
{
_helperList[key] = helper;
}
return(helper.CloneNew());
//throw new DataObjectException("配置文件 ConnectionString 节的 ProviderName 信息不正确！没有实现关于此数据连接类型的 DbHelper 插件！");
}