public int UpdateBatch <TEntity>(Expression <Func <TEntity, TEntity> > evaluator, Expression <Func <TEntity, bool> > filter = null)
where TEntity : class
{
string tableName = AttributesHelper.GetTableName <TEntity>();
List <SqlParameter> parameters = new List <SqlParameter>();
int memberInitCount = 1;
string setString = null;
evaluator.Visit <MemberInitExpression>(delegate(MemberInitExpression expression)
{
if (memberInitCount > 1)
{
throw new NotImplementedException("Currently only one MemberInitExpression is allowed for the evaluator parameter.");
}
memberInitCount++;
setString = GetDbSetStatement <TEntity>(expression, parameters);
return(expression);
});
string whereString = null;
if (filter != null)
{
whereString = GetBatchConditionQuery(filter, parameters);
}
string sql = string.Format("UPDATE {0}\r\n{1}\r\n\r\n{2}", tableName, setString, whereString);
return(this.Database.ExecuteSqlCommand(sql, parameters.ToArray()));
}
public static void SetCache <TEntity>()
where TEntity : class
{
var db = CoreDBContext.GetContext();
string tableName = AttributesHelper.GetTableName <TEntity>();
SetValue(tableName, db.Set <TEntity>().ToList());
}
public static List <TEntity> GetCacheOfEntity <TEntity>()
where TEntity : class
{
string tableName = AttributesHelper.GetTableName <TEntity>();
if (!Exists(tableName))
{
SetCache <TEntity>();
}
return(GetEntitys <TEntity>(tableName));
}
public static object GetPropertyValue(object[] entitys, string tableName, string fieldName)
{
object entity = null;
foreach (var item in entitys)
{
if (item != null && AttributesHelper.GetTableName(item.GetType()) == tableName)
{
entity = item;
break;
}
}
if (entity == null)
{
throw new Exception(string.Format("未能从参数中解析到表名为{0}的数据!", tableName));
}
return(GetPropertyValue(entity, fieldName));
}
public int Delete <T>(Expression <Func <T, bool> > predicate) where T : class
{
string tableName = AttributesHelper.GetTableName <T>();
if (!string.IsNullOrEmpty(tableName))
{
string command = String.Format("DELETE FROM {0}", tableName);
ConditionBuilder conditionBuilder = new ConditionBuilder();
conditionBuilder.Build(predicate.Body);
if (!String.IsNullOrEmpty(conditionBuilder.Condition))
{
command += " WHERE " + conditionBuilder.Condition;
}
return(this.Database.ExecuteSqlCommand(command, conditionBuilder.Arguments));
}
return(0);
}
public virtual void Delete(string[] ids)
{
string tableName = AttributesHelper.GetTableName <TEntity>();
if (!string.IsNullOrEmpty(tableName))
{
string command = string.Format("DELETE FROM {0}", tableName);
if (ids.Length > 0)
{
string ary = string.Empty;
foreach (var item in ids)
{
ary += item + ",";
}
ary = ary.Trim(new char[] { ',' });
command += string.Format(" WHERE ID IN({0})", ary);
}
this.DB.Database.ExecuteSqlCommand(command, new string[0]);
}
}
protected static T GetCache <T>()
where T : class
{
Type type = TypeHelper.GetChildType(typeof(T));
string tableName = AttributesHelper.GetTableName(type);
string cacheName = AttributesHelper.GetCacheName(type);
if (!string.IsNullOrEmpty(tableName))
{
var cache = CacheProvider.GetCache <T>(tableName);
if (cache == null)
{
lock (lockObj)
{
cache = CacheProvider.GetCache <T>(tableName);
if (cache == null && GetData != null)
{
var list = GetData.GetInvocationList();
for (int i = list.Length - 1; i >= 0; i--)
{
try
{
cache = list[i].DynamicInvoke(tableName) as T;
}
catch
{
}
if (cache != null)
{
break;
}
}
CacheProvider.AddCache(tableName, cache, cacheName ?? tableName);
}
}
}
return(cache);
}
throw new WarningException("无法缓存未设置表名的实体");
}
