/// <summary>
/// 获取要执行SQL时的列,添加和修改数据时
/// </summary>
/// <param name="des"></param>
/// <param name="add">是否是添加</param>
/// <returns></returns>
internal static IList <ParamColumnModel> GetExecColumns(ModelDes des, bool add = true)
{
var columns = new List <ParamColumnModel>();
if (des != null && des.Properties != null)
{
foreach (var item in des.Properties)
{
if ((!add) && item.CusAttribute is IdAttribute)
{
continue;
}
else if ((item.CusAttribute is IdAttribute) && ((item.CusAttribute as IdAttribute).CheckAutoId))
{
continue;
}
else if ((item.CusAttribute is ColumnAttribute) && ((item.CusAttribute as ColumnAttribute).AutoIncrement))
{
continue;
}
columns.Add(new ParamColumnModel {
ColumnName = item.Column, FieldName = item.Field
});
}
}
return(columns);
}
/// <summary>
/// 添加缓存
/// </summary>
/// <param name="key"></param>
/// <param name="des"></param>
private static void Add(string key, ModelDes des)
{
lock (objLock)
{
if ((!_ModelDesCache.ContainsKey(key)) && des != null)
{
_ModelDesCache.Add(key, des);
}
}
}
/// <summary>
/// 获取对象的主键标识列和属性
/// </summary>
/// <param name="des"></param>
/// <returns></returns>
internal static PropertyDes GetPrimary(ModelDes des)
{
var p = des.Properties.FirstOrDefault(m => m.CusAttribute is IdAttribute);
if (p == null)
{
throw new Exception("没有任何列标记为主键特性");
}
return(p);
}
/// <summary>
/// 更新缓存
/// </summary>
/// <typeparam name="T"></typeparam>
private static ModelDes UpdateModelDesCache <T>()
{
var type = typeof(T);
var cacheValue = ExistModelDesCache(type.FullName);
if (cacheValue == null)
{
var model = new ModelDes();
#region 表描述
model.ClassType = type;
model.ClassName = type.Name;
var tbAttrObj = type.GetCustomAttributes(typeof(TableAttribute), true).FirstOrDefault();
if (tbAttrObj != null)
{
var tbAttr = tbAttrObj as TableAttribute;
if (!string.IsNullOrEmpty(tbAttr.Name))
{
model.TableName = tbAttr.Name;
}
else
{
model.TableName = model.ClassName;
}
}
else
{
model.TableName = model.ClassName;
}
#endregion
#region 属性描述
foreach (var propertyInfo in type.GetProperties())
{
var pty = new PropertyDes();
pty.Field = propertyInfo.Name;
var arri = propertyInfo.GetCustomAttributes(typeof(BaseAttribute), true).FirstOrDefault();
if (arri is IgnoreColumnAttribute)
{
continue;
}
if (arri is IdAttribute)
{
pty.CusAttribute = arri as IdAttribute;
}
else if (arri is ColumnAttribute)
{
pty.CusAttribute = arri as ColumnAttribute;
}
model.Properties.Add(pty);
}
#endregion
Add(type.FullName, model);
cacheValue = model;
}
return(cacheValue);
}
/// <summary>
/// 通过表达式树获取属性名
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="des"></param>
/// <param name="expr"></param>
/// <returns></returns>
internal static PropertyDes GetPropertyByExpress <T>(ModelDes des, Expression <Func <T, object> > expr) where T : class
{
var pname = "";
if (expr.Body is UnaryExpression)
{
var uy = expr.Body as UnaryExpression;
pname = (uy.Operand as MemberExpression).Member.Name;
}
else
{
pname = (expr.Body as MemberExpression).Member.Name;
}
var p = des.Properties.FirstOrDefault(m => m.Column == pname);
if (p == null)
{
throw new Exception(string.Format("{0}不是映射列，不能进行SQL处理", pname));
}
return(p);
}