/// <summary>
/// 根据查询表达式获取查询属性,转换为表字段
/// 忽略IsIgnore=true的属性
/// </summary>
/// <param name="select">查询表达式</param>
/// <param name="unSelect">排除查询表达式</param>
/// <returns></returns>
public static List <PiMap> GetPiMapList <T>(Expression select = null, Expression unSelect = null)
{
List <PiMap> result = new List <PiMap>();
List <string> inPiList = null;
List <string> exPiList = null;
DtoMapping dtoMapping = GetDtoMapping <T>();
if (select != null)
{
inPiList = ExpressionHelper.GetPiList((Expression <Func <T, object> >)select);
for (int i = 0; i < inPiList.Count; i++)
{
if (!dtoMapping.PiMapDic.Keys.Contains(inPiList[i]))
{
continue;
//throw new Exception("属性:" + inPiList[i] + "未包含在目标对象" + typeof(T).Name + "中.");
}
if (dtoMapping.PiMapDic[inPiList[i]].IsIgnore)
{ //如果是忽略字段
continue;
}
result.Add(dtoMapping.PiMapDic[inPiList[i]]);
}
}
else if (unSelect != null)
{
exPiList = ExpressionHelper.GetPiList((Expression <Func <T, object> >)unSelect);
foreach (KeyValuePair <string, PiMap> piMapItem in dtoMapping.PiMapDic)
{
if (exPiList.Contains(piMapItem.Key))
{ //如果包含在排除列表,则跳过该属性
continue;
}
if (piMapItem.Value.IsIgnore)
{ //如果是忽略字段
continue;
}
result.Add(piMapItem.Value);
}
}
else
{ //排除忽略字段
result = dtoMapping.PiMapDic.Where(piMap => !piMap.Value.IsIgnore).Select(piMap => piMap.Value).ToList();
}
return(result);
}
/// <summary>
/// 获取Dto的DtoDbMapping,获取第一次后会放入一个缓存列表中
/// </summary>
public static DtoMapping GetDtoMapping <T>()
{
Type t = typeof(T);
if (!dtoMappingCache.ContainsKey(t))
{
lock (lockForDtoMappingObj)
{ //获取写入锁后再次判断
if (!dtoMappingCache.ContainsKey(t))
{
DtoMapping mapping = new DtoMapping();
SetDtoMappingDic <T>(mapping);
mapping.EntityType = t;
mapping.TableAttr = GetDtoTableAttr <T>();
dtoMappingCache.TryAdd(t, mapping);
}
}
}
return((DtoMapping)dtoMappingCache[t]);
}
/// <summary>
/// lambda表达式转换sql
/// 支持的方法:
/// Contains(支持List.Contains字段与字段Contains字符串),
/// StartsWith,EndsWith,=,!=,>,>=,小于,小于等于
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="select"></param>
/// <param name="query"></param>
/// <param name="orderByClauseList"></param>
/// <param name="pager"></param>
/// <param name="unSelect"></param>
/// <returns></returns>
private void FillFilter <T>(
Expression <Func <T, bool> > query = null,
Expression <Func <T, object> > select = null,
List <OrderByClause> orderByClauseList = null,
Pager pager = null,
Expression <Func <T, object> > unSelect = null) where T : class, new()
{
dtoDbMapping = DtoMappingHelper.GetDtoMapping <T>();
#region 处理查询条件
if (query != null)
{
Expression exp = query.Body as Expression;
HandleFilterExpression(exp);
}
#endregion
#region 处理排序
if (orderByClauseList != null && orderByClauseList.Count > 0)
{
for (int i = 0; i < orderByClauseList.Count; i++)
{
filter.AddOrderBy(orderByClauseList[i].FieldName, orderByClauseList[i].Order);
}
}
#endregion
#region 处理分页
if (pager != null)
{
filter.InitPage(pager.PageIndex, pager.PageSize);
}
#endregion
#region 处理查询属性
filter.Select = select;
filter.UnSelect = unSelect;
#endregion
}
/// <summary>
/// 通过解析获得Dto的对象的参数,Key:为类的属性名
/// </summary>
/// <returns>返回Dto参数</returns>
public static void SetDtoMappingDic <T>(DtoMapping mapping)
{
Dictionary <string, FieldAttribute> fieldDic = new Dictionary <string, FieldAttribute>();
Dictionary <string, PropertyInfo> piDic = new Dictionary <string, PropertyInfo>();
Type type = typeof(T);
PropertyInfo[] piList = type.GetProperties();
foreach (PropertyInfo pi in piList)
{
FieldAttribute attr = GetCustomAttribute <FieldAttribute>(pi);
NoMappingAttribute noMappingAttr = GetCustomAttribute <NoMappingAttribute>(pi);
if (attr != null)
{ //如果列名没有赋值,则将列名定义和属性名一样的值
if (string.IsNullOrEmpty(attr.Name))
{
attr.Name = pi.Name;
attr.PiName = pi.Name;
}
}
else
{ //如果实体没定义Field信息,则自动添加
attr = new FieldAttribute()
{
Name = pi.Name,
PiName = pi.Name,
};
}
if (!pi.CanRead || !pi.CanWrite)
{ //如果只读或只写,则该字段IsIgnore属性设置为True
attr.IsIgnore = true;
}
if (noMappingAttr != null)
{ //如果发现NoMapping,则该字段IsIgnore属性设置为True
attr.IsIgnore = true;
}
PiMap piMap = new PiMap(pi, attr);
mapping.PiMapDic.Add(piMap.PiName, piMap);
}
}
