In my database, I created the tables structure as follows.
CREATE TABLE Course
(
Course_ID int IDENTITY(1,1) PRIMARY KEY,
Name varchar(255) NOT NULL,
);
CREATE TABLE Student
(
Stu_ID int IDENTITY(1,1) PRIMARY KEY,
Name varchar(255) NOT NULL,
Mobile varchar(255),
Age int,
Course_ID int,
FOREIGN KEY (Course_ID) REFERENCES Course(Course_ID)
);
CREATE TABLE Subject
(
Sub_ID int IDENTITY(1,1) PRIMARY KEY,
Name varchar(255) NOT NULL,
);
CREATE TABLE Teacher
(
Teach_ID int IDENTITY(1,1) PRIMARY KEY,
Name varchar(255) NOT NULL,
Mobile varchar(255)
);
CREATE TABLE Course_Subject
(
CouSub_ID int IDENTITY(1,1) PRIMARY KEY,
Course_ID int,
Sub_ID int,
FOREIGN KEY (Course_ID) REFERENCES Course(Course_ID),
FOREIGN KEY (Sub_ID) REFERENCES Subject(Sub_ID)
);
CREATE TABLE Teacher_Subject
(
TeachSub_ID int IDENTITY(1,1) PRIMARY KEY,
Teach_ID int,
Sub_ID int,
FOREIGN KEY (Teach_ID) REFERENCES Teacher(Teach_ID),
FOREIGN KEY (Sub_ID) REFERENCES Subject(Sub_ID)
);
Now my problem is I need to retrieve students data who learned from some teacher, which means need to retrieve some teacher's students who learned from his/her. To accomplish my requirement. I write this SQL query.
select
s.*
from
tbl_student s
inner join
Course_Subject tcs on s.Course_Id = tcs.Course_Id
inner join
Teacher_Subject tst on tst.Sub_ID = tcs.Sub_ID
inner join
Teacher t on t.Teach_ID = tst.Teach_ID
where
t.Teach_ID = @SomeTeacherId
Now I need to convert this query to a lambda expression or Linq. How can I do it? Please help me. Have any possible way to generate this using Visual Studio.
3条答案
按热度按时间mzaanser1#
Well, you could use EF to generate object mapping to your tables. And use LINQ to rewrite your query with a slightly different syntax:
Not sure it's an absolutely correct query, but I hope you'll get the main idea.
ecfsfe2w2#
Have any possible way to generate this using Visual Studio.?
Yes, you can do this using Linq-to-SQL
for your query, this might be appropriated
x6492ojm3#
Lambda: