我的DataBase中有两个表BUNTS
,其中包含有关钢件的信息
CREATE TABLE BUNTS (
BUNTCODE INTEGER NOT NULL,
BUNTNAME VARCHAR(20),
BUNTSTEEL INTEGER,
......
);
和POLL_WEIGHT_BUNTS
,其中包含有关对每个短信执行的操作的信息
CREATE TABLE POLL_WEIGHT_BUNTS (
PWBCODE INTEGER NOT NULL,
PWBBUNTCODE INTEGER,
PWBDEPARTMENTFROM INTEGER,
PWBDEPARTMENTTO INTEGER
....
);
这种关系是一对多的。我将这些表映射到模型。一切都很好。 最近我决定在表BUNTS中添加一个字段,该字段将引用最后一次对bunt执行的操作:
BUNTLASTOPER INTEGER
现在我的模型看起来像这样:
[Table("BUNTS")]
public class Bunt
{
[Key]
[Column("BUNTCODE")]
public int? Code { set; get; }
[Column("BUNTNAME")]
public string Name { set; get; }
[Column("BUNTSTEEL")]
public int? SteelCode { set; get; }
[Column("BUNTLASTOPER")]
public int? LastOperationID { set; get; }
[ForeignKey("LastOperationID")]
public BuntOperation LastOperation { set; get; }
public virtual ICollection<BuntOperation> Operations { set; get; }
}
[Table("POLL_WEIGHT_BUNTS")]
public class BuntOperation
{
[Key]
[Column("PWBCODE")]
public int? Code { set; get; }
[Column("PWBBUNTCODE")]
public int? BuntCode { set; get; }
[ForeignKey("BuntCode")]
public Bunt Bunt { set; get; }
[Column("PWBDEPARTMENTFROM")]
public int? DepartmentFromCode { set; get; }
.....
}
在我完成此操作后,当我尝试查询此类操作时
return _context.Operations;
它生成一个带有新的错误字段Bunt_Code
的SQL语句SELECT
"B"."PWBCODE" AS "PWBCODE",
"B"."PWBBUNTCODE" AS "PWBBUNTCODE",
"B"."PWBDEPARTMENTFROM" AS "PWBDEPARTMENTFROM",
....
"B"."Bunt_Code" AS "Bunt_Code"
FROM "POLL_WEIGHT_BUNTS" AS "B"
我假设现在EF查找的字段是BUNTS
表的外键,并且无法找到它。因此它生成Bunt_Code
字段,我的数据库中缺少该字段。但是我在Bunt
类中已经有一个属性BuntOperation
,它引用了BUNTS
表。我错过了什么?
UPDATE 似乎这解决了我的问题
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<Bunt>().HasOptional(b => b.LastOperation).WithMany();
modelBuilder.Entity<Bunt>().HasMany(b => b.Operations).WithRequired(op => op.Bunt);
}
答案 0 :(得分:0)
似乎这解决了我的问题
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<Bunt>().HasOptional(b => b.LastOperation).WithMany();
modelBuilder.Entity<Bunt>().HasMany(b => b.Operations).WithRequired(op => op.Bunt);
}