- EFCore扩展Select方法(根据实体定制查询语句)
- Extentions Update Method 支持 UPDATE User SET Id=Id+1 自更新操作
public partial class User
{
public int Id { get; set; }
[Required]
[StringLength(50)]
public string Name { get; set; }
public int RoleId { get; set; }
[ForeignKey(nameof(RoleId))]
public virtual Role Role { get; set; }
}
public partial class Role
{
public int Id { get; set; }
public string Name { get; set; }
public int DepartmentId { get; set; }
[ForeignKey(nameof(DepartmentId))]
public virtual Department Department { get; set; }
}
public partial class Department
{
public int Id { get; set; }
[Required]
[StringLength(50)]
public string Name { get; set; }
} public partial class UserModel
{
public string Name { get; set; }
public string RoleName { get; set; }
//[FromEntity("Name","Role")]
//public string RoleName1 { get; set; }
[FromEntity("Name", "Department", "Role")]
public string DepartmentName { get; set; }
}static void Main(string[] args)
{
using (var context = new TestContext())
{
var list = context.User.Select<UserModel>().ToList();
}
Console.WriteLine($"------------结束--------------------");
Console.ReadLine();
} SELECT [u].[Name] AS [Name0], [u.Role].[Name] AS [RoleName], [u.Role.Department].[Name] AS [DepartmentName]
FROM [User] AS [u]
INNER JOIN [Role] AS [u.Role] ON [u].[RoleId] = [u.Role].[Id]
INNER JOIN [Department] AS [u.Role.Department] ON [u.Role].[DepartmentId] = [u.Role.Department].[Id]此方案用在接口，精确查询字段，需要强类型视图的地方相对比较方便
static void Main(string[] args)
{
using (var context = new TestContext())
{
var user1 = context.User.AsNoTracking().FirstOrDefault(x=>x.Id==2);
Console.WriteLine($"-----------Before Update --------------------");
Console.WriteLine($"{user1.Id}:{user1.Name}:{user1.RoleId}");
//更新语句
context.User.Where(x => x.Id == 2).RestValue(x => x.Name == (x.Name + " Add Bob") && x.RoleId == (x.RoleId + 1));
var user2 = context.User.AsNoTracking().FirstOrDefault(x => x.Id == 2);
Console.WriteLine($"-----------After Update --------------------");
Console.WriteLine($"{user2.Id}:{user2.Name}:{user2.RoleId}");
}
Console.WriteLine($"------------结束--------------------");
Console.ReadLine();
}生成的SQL如下
UPDATE [x] SET x.[Name] =x.[Name] + @param_0 ,x.[RoleId] =x.[RoleId] + @param_1
FROM [User] AS [x]
WHERE [x].[Id] = 2