/*-------------LINQ to SQL框架入口System.Data.Linq.DataContext初始化(初始化数据库连接、打开连接、事务开启等)-------------*/
/// <summary>
/// 获取数据库上下文
/// </summary>
/// <param name="attr"></param>
/// <returns></returns>
private SqlDataContext GetDataContext(BusinessMethodAttribute attr)
{
SqlDataContext dataContext = new SqlDataContext(this.ReaderConnectionString(), new DynamicMappingSource());
dataContext.ObjectTrackingEnabled = false;
dataContext.Log = Console.Out;
dataContext.Connection.Open();
DbTransaction trans = null;
var attrTrans = attr.Transaction;
if (attrTrans != Transaction.None)
{
trans = attrTrans == Transaction.Lock ? dataContext.Connection.BeginTransaction() : attrTrans == Transaction.WithNoLock ? dataContext.Connection.BeginTransaction(IsolationLevel.ReadUncommitted) : dataContext.Connection.BeginTransaction(IsolationLevel.ReadUncommitted);
}
dataContext.Transaction = trans;
//
dataContext.DataTableChanged.Clear();
return(dataContext);
}
/// <summary>
/// 方法调用开始--注入SqlDataContext对象
/// </summary>
internal void MethodBegin(IMessage msg, IMethodReturnMessage methodReturnMsg, BusinessMethodAttribute attr)
{
//注入SqlDataContext对象到业务基类
this._DataContext = this.GetDataContext(attr);
//注入dao到业务基类--用注入的SqlDataContext对象，反射初始化业务子类方法中字段或属性的dao
Type type = this.GetType();
BindingFlags bf = BindingFlags.Instance | BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.DeclaredOnly;
FieldInfo[] fi = type.GetFields(bf).Where(p => p.FieldType.GetInterface("BusinessProxy.ITemplateBaseDao") != null).ToArray();
PropertyInfo[] pi = type.GetProperties().Where(p => p.PropertyType.GetInterface("BusinessProxy.ITemplateBaseDao") != null).ToArray();
//字段中的dao
foreach (var item in fi)
{
ITemplateBaseDao dao = item.GetValue(this) as ITemplateBaseDao;
if (dao == null)
{
dao = Activator.CreateInstance(item.FieldType) as ITemplateBaseDao;
item.SetValue(this, dao);
}
if (dao != null)
{
dao.DataContext = this._DataContext;
}
}
//属性中的dao
foreach (var item in pi)
{
ITemplateBaseDao dao = item.GetValue(this, null) as ITemplateBaseDao;
if (dao == null)
{
dao = Activator.CreateInstance(item.PropertyType) as ITemplateBaseDao;
item.SetValue(this, dao);
}
if (dao != null)
{
dao.DataContext = this._DataContext;
}
}
}