方式一 Linq To Entity形式：
/// <summary>
/// 查询的数据
/// </summary>
/// <param name="order">升序asc（默认）还是降序desc</param>
/// <param name="sort">排序字段</param>
/// <param name="search">查询条件</param>
/// <param name="listQuery">额外的参数</param>
/// <returns></returns>
public IQueryable<BasicComponentView> DaoChuData(YKTEntities db, string order, string sort, QueryEntity entity, int userId)
{
int? type_id = null;
int? userComId = null;
if (userId > 0)
{
var d = db.SMUSERTB.Where(x => x.USER_ID == userId).Select(x => new { x.TYPE_ID, x.COMPONENT_ID }).FirstOrDefault();
type_id = d.TYPE_ID;
userComId = d.COMPONENT_ID;
}
var data = from a in db.OMBASICCOMPONENTTB
join b in db.BASE_DICTIONARY on a.GUILD_CODE equals b.ITEM_VALUE
into ComDir
from b in ComDir.DefaultIfEmpty()
join c in db.OMCOMPONENTTYPETB on new { a.GUILD_CODE, a.TYPE_CODE } equals new { c.GUILD_CODE, c.TYPE_CODE } into BaseComType
from c in BaseComType.DefaultIfEmpty()
join d in db.OMBASICCOMPONENTTB on a.FATHER_ID equals d.COMPONENT_ID into BaseCom
from d in BaseCom.DefaultIfEmpty()
where a.STATUS != "0"
select new BasicComponentView
{
COMPONENT_NAME = a.COMPONENT_NAME,
SEGMENT2 = a.SEGMENT2,
SEGMENT4 = a.SEGMENT4,
REMARK = a.REMARK,
SEGMENT3 = a.SEGMENT3,
SEGMENT40 = a.SEGMENT40,
IndustryName = b.ITEM_NAME,
TypeName = c.TYPE_NAME,
ParentCommponent = d.COMPONENT_NAME,
FATHER_ID = a.FATHER_ID,
TYPE_CODE = a.TYPE_CODE,
GUILD_CODE = a.GUILD_CODE,
COMPONENT_ID = a.COMPONENT_ID,
COMMUN_ID = a.COMMUN_ID,
CommunName = db.OMCOMMUNICATIONTB.Where(x => x.COMMUN_ID == a.COMMUN_ID && x.STATUS != "D").
Select(x => x.COMMUN_NAME).FirstOrDefault()
};
if (entity.Industry == "BUS") //行业为公交
{
data = data.Where(x => x.GUILD_CODE == "BUS");
switch (entity.Type)
{
case null:
case "":
if (type_id != 1)
{
data = data.Where(x => x.FATHER_ID == userComId).AsQueryable();
}
break;
case "1": //公司
if (type_id != 1)
{
data = data.Where(x => x.FATHER_ID == userComId && x.TYPE_CODE == 2);
}
else
{
data = data.Where(x => x.TYPE_CODE == 1);
}
break;
case "2": //分公司
data = data.Where(x => x.TYPE_CODE == 2);
if (!string.IsNullOrEmpty(entity.Unit))
{
int unit = int.Parse(entity.Unit);
data = data.Where(x => x.FATHER_ID == unit);
}
break;
case "3"://线路
data = data.Where(x => x.TYPE_CODE == 3);
if (!string.IsNullOrEmpty(entity.Com))
{
int id = int.Parse(entity.Com);
data = data.Where(x => x.FATHER_ID == id);
}
else if (string.IsNullOrEmpty(entity.Com) && !string.IsNullOrEmpty(entity.Unit))
{
int id = int.Parse(entity.Unit);
data = from m in data where (from f in db.OMBASICCOMPONENTTB where f.STATUS != "0" && f.FATHER_ID == id select
f.COMPONENT_ID).Any(x => x == m.FATHER_ID) select m;
}
break;
case "4": //车辆
if (!string.IsNullOrEmpty(entity.Line))
{
data = data.Where(x => x.TYPE_CODE == 4);
int id = int.Parse(entity.Line);
data = data.Where(x => x.FATHER_ID == id);
}
else if (string.IsNullOrEmpty(entity.Line) && !string.IsNullOrEmpty(entity.Com))
{
data = data.Where(x => x.TYPE_CODE == 4);
int id = int.Parse(entity.Com);
data = from m in data where (from f in db.OMBASICCOMPONENTTB where f.STATUS != "0" && f.FATHER_ID == id
select f.COMPONENT_ID).Any(x => x == m.FATHER_ID) select m;
}
else if (string.IsNullOrEmpty(entity.Line) && string.IsNullOrEmpty(entity.Com) && !string.IsNullOrEmpty(entity.Unit))
{
int id = int.Parse(entity.Unit);
var temp1 = db.OMBASICCOMPONENTTB.Where(x => x.STATUS != "0" && x.FATHER_ID == id).Select(x => x.COMPONENT_ID);
var temp2 = db.OMBASICCOMPONENTTB.Where(x => x.STATUS != "0").Select(x => x.COMPONENT_ID);
var temp = from m in temp2 where temp1.Any(x => x == m) select m;
data = from m in data where temp.Any(x => x == m.FATHER_ID) select m;
}
else
{
data = data.Where(x => x.TYPE_CODE == 4);
}
break;
default: //car
if (!string.IsNullOrEmpty(entity.Car))
{
int id = int.Parse(entity.Car);
data = data.Where(x => x.TYPE_CODE == 5 && x.FATHER_ID == id);
}
else if (string.IsNullOrEmpty(entity.Car) && !string.IsNullOrEmpty(entity.Line))
{
int id = int.Parse(entity.Line);
var temp = db.OMBASICCOMPONENTTB.Where(x => x.STATUS != "0" && x.FATHER_ID == id).Select(x => x.COMPONENT_ID);
data = from m in data where temp.Any(x => x == m.FATHER_ID) select m;
}
else if (string.IsNullOrEmpty(entity.Car) && string.IsNullOrEmpty(entity.Line) && !string.IsNullOrEmpty(entity.Com))
{
int id = int.Parse(entity.Com);
var temp1 = db.OMBASICCOMPONENTTB.Where(x => x.STATUS != "0" && x.FATHER_ID == id).Select(x => x.COMPONENT_ID);
var temp2 = db.OMBASICCOMPONENTTB.Where(x => x.STATUS != "0").Select(x => x.COMPONENT_ID);
var temp = from m in temp2 where temp1.Any(x => x == m) select m;
data = from m in data where temp.Any(x => x == m.FATHER_ID) select m;
}
else if (string.IsNullOrEmpty(entity.Car) && string.IsNullOrEmpty(entity.Line) && string.IsNullOrEmpty(entity.Com) &&
!string.IsNullOrEmpty(entity.Unit))
{
int id = int.Parse(entity.Unit);
var temp1 = db.OMBASICCOMPONENTTB.Where(x => x.STATUS != "0" && x.FATHER_ID == id).Select(x => x.COMPONENT_ID);
var temp2 = db.OMBASICCOMPONENTTB.Where(x => x.STATUS != "0").Select(x => x.COMPONENT_ID);
var temp3 = db.OMBASICCOMPONENTTB.Where(x => x.STATUS != "0").Select(x => x.COMPONENT_ID);
var temp4 = from m in temp2 where temp1.Any(x => x == m) select m;
var temp = from m in temp3 where temp4.Any(x => x == m) select m;
data = from m in data where temp.Any(x => x == m.FATHER_ID) select m;
}
else
{
data = data.Where(x => x.TYPE_CODE == 5);
}
break;
}
}
else if (string.IsNullOrEmpty(entity.Industry))//没选择行业
{
}
else //其他行业
{
data = data.Where(x => x.GUILD_CODE == entity.Industry);
if (string.IsNullOrEmpty(entity.Type))
{
if (type_id != 1)
{
data = data.Where(x => x.FATHER_ID == userComId);
}
}
else if (entity.Type == "1")
{
if (type_id != 1)
{
data = data.Where(x => x.FATHER_ID == userComId && x.TYPE_CODE == 2);
}
else
{
data = data.Where(x => x.TYPE_CODE == 1);
}
}
else if (entity.Type == "2")
{
data = data.Where(x => x.TYPE_CODE == 2);
if (!string.IsNullOrEmpty(entity.Unit))
{
int id = int.Parse(entity.Unit);
data = data.Where(x => x.FATHER_ID == id);
}
}
else
{
if (!string.IsNullOrEmpty(entity.Com))
{
int id = int.Parse(entity.Com);
data = data.Where(x => x.TYPE_CODE == 5 && x.FATHER_ID == id);
}
else if (entity.Com == "" && entity.Unit != "")
{
int id = int.Parse(entity.Unit);
data = data.Where(x => x.TYPE_CODE == 3);
var temp = db.OMBASICCOMPONENTTB.Where(x => x.STATUS != "0" && x.FATHER_ID == id).Select(x => x.COMPONENT_ID).FirstOrDefault();
data = data.Where(x => x.FATHER_ID == temp);
}
else
{
int id = int.Parse(entity.Type);
data = data.Where(x => x.TYPE_CODE == id);
}
}
}
if (!string.IsNullOrEmpty(entity.Name))
{
data = data.Where(x => x.COMPONENT_NAME.Contains(entity.Name));
}
if (data != null)
{
data = LinqHelper.DataSorting(data, sort, order);
}
return data;
}
方式二 拼接字符串：
/// <summary>
/// 查询的数据
/// </summary>
/// <param name="YKTEntities">数据访问的上下文</param>
/// <param name="order">排序字段</param>
/// <param name="sort">升序asc（默认）还是降序desc</param>
/// <param name="search">查询条件</param>
/// <param name="listQuery">额外的参数</param>
/// <returns></returns>
public IQueryable<SMROLETB> DaoChuData(YKTEntities db, string order, string sort, string search, params object[] listQuery)
{
string where = string.Empty;
int flagWhere = 0;
Dictionary<string, string> queryDic = ValueConvert.StringToDictionary(search.GetString());
if (queryDic != null && queryDic.Count > 0)
{
foreach (var item in queryDic)
{
if (flagWhere != 0)
{
where += " and ";
}
flagWhere++;
if (!string.IsNullOrWhiteSpace(item.Key) && !string.IsNullOrWhiteSpace(item.Value) && item.Key.Equals("STATUS")) //需要查询的列名
{
where += "it." + item.Key + " = ‘" + item.Value + "‘";
continue;
}
where += "it." + item.Key + " like ‘%" + item.Value + "%‘";
}
}
return db.SMROLETB
.Where(string.IsNullOrEmpty(where) ? "true" : where)
.OrderBy("it." + sort.GetString() + " " + order.GetString())
.AsQueryable();
}Entity Framework多表多条件动态查询,布布扣,bubuko.com
原文地址：http://blog.csdn.net/zouyujie1127/article/details/25400835
