关系型数据之LinQ基本查询

如下图所示关系型数据,LinQ语句为:


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" alt="" width="650" height="309" />

var Query= from a in data.A
where a.admin==传入的用户名&&a.pwd==传入的密码(可以传入一个model实体)
join b in data.B
on a.bid equals b.id into ab
from r1 in ab.DefaultIfEmpty()
join c in data.C
on r1.cid equals c.id into bc
from r2 in bc.DefaultIfEmpty()
join d in data.D
on r2.did equals d.id into cd
from r3 in cd.DefaultIfEmpty() select new
{ //这里是table A 的id;
Id = a.Id, //这里是table B的Name;
Name = r1.Name,
Pro = r2.Pro,
IpAdd = r3.IpAdd
}; //转成数组形式; var list = Query.ToList(); //list[0].Name即表示整个LinQ查询的结果的第一条数据的table B的Name,以此类推;

注: r1可以.出table B的所有数据...以此类推;

r2==table C;

r3==table D;

=====================================================================================================

 、左连接:

 var LeftJoin = from emp in ListOfEmployees
join dept in ListOfDepartment
on emp.DeptID equals dept.ID into JoinedEmpDept
from dept in JoinedEmpDept.DefaultIfEmpty()
select new
{
EmployeeName = emp.Name,
DepartmentName = dept != null ? dept.Name : null
}; 、右连接:

var RightJoin = from dept in ListOfDepartment
join employee in ListOfEmployees
on dept.ID equals employee.DeptID into joinDeptEmp
from employee in joinDeptEmp.DefaultIfEmpty()
select new
{
EmployeeName = employee != null ? employee.Name : null,
DepartmentName = dept.Name
}; 29 、内连接: var query = from t in entitiy.TB_GCGL_ADA_USER
join p in entitiy.TB_GCGL_ZY_ZYK
on t.ETPRS_CODE equals p.ETPRS_CODE select new TB_USER_ZYK
{
USER_ID = t.USER_ID,
USER_NAME = t.USER_NAME,
USER_PASSWORD = t.USER_PASSWORD, };
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