Question

connection();
String sqlQueryReg = "INSERT INTO  StudentReg(Name, City, Address) VALUES(@Name,@City,@Address)";
SqlCommand cmdReg = new SqlCommand(sqlQueryReg, con);
cmdReg.Parameters.AddWithValue("@Name", model.Name);
cmdReg.Parameters.AddWithValue("@City", model.City);
cmdReg.Parameters.AddWithValue("@Address", model.Address);

con.Open();
int iReg = cmdReg.ExecuteNonQuery();

if (iReg >= 1)
{
    String sqlQueryInfo = "INSERT INTO  StudentInfo(Id, MotherName, FatherName) VALUES(@Id, @MotherName,@FatherName)";
    SqlCommand cmdInfo = new SqlCommand(sqlQueryInfo, con);
    cmdInfo.Parameters.AddWithValue("@Id", ????????????????);
    cmdInfo.Parameters.AddWithValue("@MotherName", model.MotherName);
    cmdInfo.Parameters.AddWithValue("@FatherName", model.FatherName);
    int iInfo = cmdInfo.ExecuteNonQuery();
}
con.Close();

由于某种原因，我需要分离2个与1：1关系相关的表[StudentReg]表包含一个自动编号（SQL Server中的标识）。在[StudentRecord]中插入记录后，我需要[Id]字段值，因为我需要将它插入第二个表[StudentInfo]

预期产出

[StudentReg] Table : Note : (Id = Assigned by SQL Server-Identity)
Id | Name | City  | Address
1  | John | ABC   | DEF
2  | Kent | GHI   | PPP

[StudentInfo] Table 
Id | Mother Name | Father Name
1  | Maria       | Jake
2  | Janice      | Frank

Answer 1

使用Scope_Identity获取当前会话和范围中最后插入的标识值

declare @StudentRegId int 

INSERT INTO  StudentReg(Name, City, Address) VALUES(@Name,@City,@Address)

select @StudentRegId = scope_identity()

INSERT INTO  StudentInfo(Id, MotherName, FatherName) VALUES(@StudentRegId, @MotherName,@FatherName)

Answer 2

如果存在插入触发器，则范围标识将起作用，否则您可以使用ExecuteScalar

Int32 savedId;

connection();
String sqlQueryReg = "INSERT INTO  StudentReg(Name, City, Address) OUTPUT INSERTED.ID VALUES(@Name,@City,@Address)";
SqlCommand cmdReg = new SqlCommand(sqlQueryReg, con);
cmdReg.Parameters.AddWithValue("@Name", model.Name);
cmdReg.Parameters.AddWithValue("@City", model.City);
cmdReg.Parameters.AddWithValue("@Address", model.Address);
savedId = (Int32) cmgRed.ExecuteScalar();

con.Open();
int iReg = cmdReg.ExecuteNonQuery();

if (iReg >= 1)
{
    String sqlQueryInfo = "INSERT INTO  StudentInfo(Id, MotherName, FatherName) VALUES(@Id, @MotherName,@FatherName)";
    SqlCommand cmdInfo = new SqlCommand(sqlQueryInfo, con);
    cmdInfo.Parameters.AddWithValue("@Id", savedId);
    cmdInfo.Parameters.AddWithValue("@MotherName", model.MotherName);
    cmdInfo.Parameters.AddWithValue("@FatherName", model.FatherName);
    int iInfo = cmdInfo.ExecuteNonQuery();
}
con.Close();

另外，请查看.GetLastInsertId()

具有1：1关系的多个相关表。自动编号的第一个表

2 个答案: