/// <summary>
/// search student information
/// </summary>
/// <param name="query">query string </param>
/// <param name="e">reference variable use for return query error information</param>
/// <returns>query result</returns>
///
public static List <tbl_student> search(string keywords, ref Err e)
{
//todo judge query exist
try
{
DataBase db = new DataBase();
List <tbl_student> result = new List <tbl_student>();
result.AddRange((
from d in db.tbl_student
where d.S_Num.IndexOf(keywords) >= 0
orderby d.S_index
select d
).ToList());
result.AddRange((
from d in db.tbl_student
where d.S_Name.IndexOf(keywords) >= 0
orderby d.S_index
select d
).ToList());
result.AddRange((
from d in db.tbl_student
where d.S_Gender.IndexOf(keywords) >= 0
orderby d.S_index
select d
).ToList());
result.AddRange((
from d in db.tbl_student
where d.S_Department.IndexOf(keywords) >= 0
orderby d.S_index
select d
).ToList());
return(result);
}
catch (Exception ex)
{
e.res = false;
e.info = ex.Message;
return(null);
}
}
public static Err update(tbl_course cc)
{
Err e = new Err();
try
{
DataBase db = new DataBase();
tbl_course c = (
from d in db.tbl_course
where d.C_index == cc.C_index
select d
).Single();
c = cc;
db.SaveChanges();
}
catch (Exception ex)
{
e.res = false;
e.info = ex.Message;
}
return(e);
}
/// <summary>
/// change user information(not include index!!!!)
///
/// 1. connecting to database
/// 2. find the object befor information
/// 3. change the value of the object
/// 4. save change in database
/// </summary>
/// <param name="user">input user information</param>
/// <returns>error information</returns>
public static Err update(tbl_user user)
{
Err e = new Err();
try
{
var db = new DataBase();
var before = (from d in db.tbl_user
where d.U_index == user.U_index
select d).Single();
before.U_ID = user.U_ID;
before.U_Power = user.U_Power;
before.U_PWD = user.U_PWD;
db.SaveChanges();
}
catch (Exception ex)
{
e.res = false;
e.info = ex.Message;
}
return(e);
}
public static Err mark_update(int index, decimal new_mark)
{
Err e = new Err();
try
{
using (var db = new DataBase())
{
tbl_stu_mark tsm = (
from d in (new DataBase()).tbl_stu_mark
where d.mk_index == index
select d
).Single();
tsm.mk_mark = new_mark;
db.SaveChanges();
}
}
catch (Exception ex)
{
}
return(e);
}
public static List <tbl_student> searchtime(
DateTime birthday_start,
DateTime birthday_end,
ref Err e)
{
//todo judge query exist
try
{
DataBase db = new DataBase();
var q = from d in db.tbl_student
where d.S_Birthday >= birthday_start && d.S_Birthday <= birthday_end
orderby d.S_index
select d;
return(q.ToList());
}
catch (Exception ex)
{
e.res = false;
e.info = ex.Message;
return(null);
}
}
public static List <tbl_course> search(string keyword, ref Err e)
{
try
{
using (var db = new DataBase())
{
List <tbl_course> result = new List <tbl_course>();
result.AddRange((
from d in db.tbl_course
where d.C_Num.IndexOf(keyword) >= 0
orderby d.C_Num
select d
).ToList());
result.AddRange((
from d in db.tbl_course
where d.C_Name.IndexOf(keyword) >= 0
orderby d.C_Num
select d
).ToList());
result.AddRange((
from d in db.tbl_course
where d.C_Course.IndexOf(keyword) >= 0
orderby d.C_Num
select d
).ToList());
return(result);
}
}
catch (Exception ex)
{
e.res = false;
e.info = ex.Message;
return(null);
}
}
public static Err mark_update(v_mark vv)
{
Err e = new Err();
try
{
using (var db = new DataBase())
{
tbl_stu_mark tsm = (
from d in db.tbl_stu_mark
where d.mk_index == vv.mk_index
select d
).Single();
tsm.mk_mark = vv.mk_mark;
db.SaveChanges();
}
}
catch (Exception ex)
{
e.res = false;
e.info = ex.Message;
}
return(e);
}