.NetCore中EFCore的使用整理（三）-關聯表操做

1、查詢關聯表數據

            StudyAboard_TestContext _context = new StudyAboard_TestContext();
            CrmRole role = _context.CrmRole
                .Include(q => q.CrmRoleMenu)
                .Where(q => q.Id == 1).FirstOrDefault();

 

2、清空關聯表數據

            StudyAboard_TestContext _context = new StudyAboard_TestContext();
            CrmRole role = _context.CrmRole
                .Include(q => q.CrmRoleMenu)
                .Where(q => q.Id == 1).FirstOrDefault();

            //清空關聯表數據
            _context.CrmRoleMenu.RemoveRange(role.CrmRoleMenu);
            _context.SaveChanges();

 

3、添加關聯表數據

1.徹底添加

            CrmRole role = new CrmRole()
            {
                Name = "測試角色"
            };

            role.CrmRoleMenu.Add(new CrmRoleMenu()
            {
                MenuId = 1
            });
            role.CrmRoleMenu.Add(new CrmRoleMenu()
            {
                MenuId = 2
            });
            _context.CrmRole.Add(role);
            _context.SaveChanges();

 

2.讀取後添加

            StudyAboard_TestContext _context = new StudyAboard_TestContext();
            CrmRole role = _context.CrmRole
                .Include(q => q.CrmRoleMenu)
                .Where(q => q.Id == 1).FirstOrDefault();

            //添加關聯表數據
            role.CrmRoleMenu.Add(new CrmRoleMenu()
            {
                MenuId = 1
            });
            role.CrmRoleMenu.Add(new CrmRoleMenu()
            {
                MenuId = 2
            });
            _context.SaveChanges();

 

 

更多：

EF Core中執行Sql語句查詢操做之FromSql，ExecuteSqlCommand，SqlQuery

.NetCore中EFCore的使用整理（二）-關聯表查詢

.NetCore中EFCore的使用整理