Postgres GENERATED AS IDENTITY 与 .NET 实体模型冲突

Question

我正在使用 .NET Core、PostgresSQL 和 SQLKata+dapper（非 EF）构建 API

我有这两张桌子

CREATE TABLE "UserProfile"(
    "Id" INT GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
    "Deleted" BOOLEAN NOT NULL DEFAULT FALSE,
    "CreatedBy" VARCHAR(50) NOT NULL,
    "CreatedTime" TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_DATE,
    "LastModifiedBy" VARCHAR(50),
    "LastModifiedTime" TIMESTAMP WITH TIME ZONE,
    "FirstName" VARCHAR(50) NOT NULL,
    "LastName" VARCHAR(50),
    "Email" VARCHAR(50) UNIQUE NOT NULL
);
CREATE TABLE "UserLogin"(
    "Id" INT GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
    "Deleted" BOOLEAN NOT NULL DEFAULT FALSE,
    "CreatedBy" VARCHAR(50) NOT NULL,
    "CreatedTime" TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_DATE,
    "LastModifiedBy" VARCHAR(50),
    "LastModifiedTime" TIMESTAMP WITH TIME ZONE,
    "Username" VARCHAR(50) UNIQUE NOT NULL,
    "Password" VARCHAR(200) NOT NULL,
    "IsLocked" BOOLEAN NOT NULL DEFAULT FALSE,
    "IsActive" BOOLEAN NOT NULL DEFAULT FALSE,
    "UserProfileId" INT NOT NULL,
    CONSTRAINT "FK_UserLogin_UserProfile" FOREIGN KEY("UserProfileId") REFERENCES "UserProfile"("Id")
);

在我的 C# 中，我创建了包含表格的实体

public class BaseEntity
{
    public int Id { set; get; }
    public bool Deleted { set; get; }
    public string CreatedBy { set; get; }
    public DateTime CreatedTime { set; get; }
    public string LastModifiedBy { set; get; }
    public DateTime? LastModifiedTime { set; get; }

    public BaseEntity()
    {
        this.Deleted = false;
        this.CreatedBy = "SYSTEM"; //TODO: Change to UserPrincipal
        this.CreatedTime = DateTime.Now;
        this.LastModifiedBy = null;
        this.LastModifiedTime = null;
    }
}

public class UserLogin : BaseEntity 
{
    public string Username { set; get; }
    public string Password { set; get; }
    public bool IsLocked { set; get; }
    public bool IsActive { set; get; }
    public int UserProfileId { set; get; }
}

public class UserProfile:BaseEntity
{
    public string FirstName { set; get; }
    public string LastName { set; get; }
    public string Email { set; get; }

}

那么问题来了，如果我想在数据库中插入新记录

public async Task<ResponseBase> SignUp(SignUpRequest request)
    {
        ResponseBase result = new ResponseBase();
        try
        {
            using var conn = await db.CreateConnectionAsync();
            var query = new QueryFactory(conn, new PostgresCompiler());
            var scope = conn.BeginTransaction();

            var userProfileId = await query.Query(UserProfileConst.TableName)
                                           .InsertAsync(new UserProfile
                                           {
                                               FirstName = request.FirstName,
                                               LastName = request.LastName,
                                               Email = request.Email
                                           });

            var affectedUserLogin = await query.Query(UserLoginConst.TableName)
                                               .InsertAsync(new UserLogin
                                               {
                                                   Username = request.Username,
                                                   Password = Argon2.Hash(request.Password),
                                                   IsActive = true,
                                                   IsLocked = false,
                                                   UserProfileId = userProfileId
                                               });
            
            if (userProfileId > 0 && affectedUserLogin > 0)
            {
                scope.Commit();
                result.Success("Success Insert New User");
            }
            else
            {
                scope.Rollback();
                result.Failed("Success Insert New User");
            }
        }
        catch (Exception e)
        {
            result.Failed(e.Message);
        }
        return result;
    } 

new UserLogin({ }) 和 new UserProfile({ }) 将自动将默认值设置为 Id 从 BaseEntity 到 0 它会导致Postgres中的错误

{
    "acknowledge": 0,
    "message": "428C9: cannot insert into column \"Id\"",
    "isSuccess": false
}

我知道我可以创建新的Object 而不定义它的类，但我想知道是否还有其他方法

有人有想法吗？

Answer 1

您可以在列上使用KeyAttribute 注释将其标记为主键，以便在插入/更新查询时将其忽略。

您也可以使用Ignore 属性忽略任意字段

public class BaseEntity
{
    [Key]
    public int PrimaryKeyColumnWillBeIgnoredOnInsert { set; get; }
   
    [Ignore]
    public int ThisColumnWillBeIgnoredAlso { set; get; }
}

检查 https://github.com/sqlkata/querybuilder/blob/master/QueryBuilder/ColumnAttribute.cs#L27