我有一个具有不同方法和构造函数的类。在SaveDB（）中，我选择@@ IDENTITY，但我不知道如何将其返回到C＃中。我在Stack上看到有关于此的其他帖子，但我没有看到C＃的任何直接答案。任何帮助表示赞赏。
我正在寻找的结果看起来像这样：
int mySiteUserID;
mySiteUserID = 4; //4 is the Identity of the last saved SiteUser
public class SiteUser
{
#region Fields
private int siteUserID;
private string siteUserFirstName;
private string siteUserLastName;
private string siteUserTitle;
private string siteUserEmail;
private string siteUserPhone;
private string siteUserPassword;
private int siteUserType;
private int companyID;
private bool siteUserActive;
#endregion
#region Properties
public int SiteUserID { get { return siteUserID; } set { siteUserID = value; } }
public string SiteUserFirstName { get { return siteUserFirstName; } set { siteUserFirstName = value; } }
public string SiteUserLastName { get { return siteUserLastName; } set { siteUserLastName = value; } }
public string SiteUserTitle { get { return siteUserTitle; } set { siteUserTitle = value; } }
public string SiteUserEmail { get { return siteUserEmail; } set { siteUserEmail = value; } }
public string SiteUserPhone { get { return siteUserPhone; } set { siteUserPhone = value; } }
public string SiteUserPassword { get { return siteUserPassword; } set { siteUserPassword = value; } }
public int SiteUserType { get { return siteUserType; } set { siteUserType = value; } }
public int CompanyID { get { return companyID; } set { companyID = value; } }
public bool SiteUserActive { get { return siteUserActive; } set { siteUserActive = value; } }
#endregion
#region Constructors
public SiteUser()
{
siteUserID = 0;
siteUserFirstName = "";
siteUserLastName = "";
siteUserTitle = "";
siteUserEmail = "";
siteUserPhone = "";
siteUserPassword = "";
siteUserType = 0;
companyID = 0;
siteUserActive = false;
}
public SiteUser(int PrimaryKeyValue)
{
string sql = @"
SELECT *
FROM SiteUsers
WHERE SiteUserID = @PrimaryKeyValue";
SqlParameter[] parms = new SqlParameter[1];
parms[0] = new SqlParameter("@PrimaryKeyValue", PrimaryKeyValue);
SqlDataReader dr = DBUtil.FillDataReader(sql, parms);
while (dr.Read())
{
this.siteUserID = Convert.ToInt32(dr["siteUserID"].ToString());
this.siteUserFirstName = Convert.ToString(dr["siteUserFirstName"].ToString());
this.siteUserLastName = Convert.ToString(dr["siteUserLastName"].ToString());
this.siteUserTitle = Convert.ToString(dr["siteUserTitle"].ToString());
this.siteUserEmail = Convert.ToString(dr["siteUserEmail"].ToString());
this.siteUserPhone = Convert.ToString(dr["siteUserPhone"].ToString());
this.siteUserPassword = Convert.ToString(dr["siteUserPassword"].ToString());
this.siteUserType = Convert.ToInt32(dr["siteUserType"].ToString());
this.companyID = Convert.ToInt32(dr["companyID"].ToString());
this.siteUserActive = Convert.ToBoolean(dr["siteUserActive"].ToString());
}
dr.Close();
}
#endregion
public int SaveDB()
{
//db code to write record
SqlConnection conn = new SqlConnection(Config.ConnectionString);
string sql = "";
if (SiteUserID == 0)
{
//this is an insert
sql = @"
INSERT SiteUsers(
--SiteUserID,
SiteUserFirstName,
SiteUserLastName,
SiteUserTitle,
SiteUserEmail,
SiteUserPhone,
SiteUserPassword,
SiteUserType,
CompanyID,
SiteUserActive
)VALUES(
--@SiteUserID,
@SiteUserFirstName,
@SiteUserLastName,
@SiteUserTitle,
@SiteUserEmail,
@SiteUserPhone,
@SiteUserPassword,
@SiteUserType,
@CompanyID,
@SiteUserActive
);
SELECT @@IDENTITY
";
}
else
{
//this is an update //siteUserID = @siteUserID
//this is an update //siteUserFirstName = @siteUserFirstName
//this is an update //siteUserLastName = @siteUserLastName
//this is an update //siteUserTitle = @siteUserTitle
//this is an update //siteUserEmail = @siteUserEmail
//this is an update //siteUserPhone = @siteUserPhone
//this is an update //siteUserPassword = @siteUserPassword
//this is an update //siteUserType = @siteUserType
//this is an update //companyID = @companyID
//this is an update //siteUserActive = @siteUserActive
sql = @"
UPDATE SiteUsers
SET
--SiteUserID = @SiteUserID,
SiteUserFirstName = @SiteUserFirstName,
SiteUserLastName = @SiteUserLastName,
SiteUserTitle = @SiteUserTitle,
SiteUserEmail = @SiteUserEmail,
SiteUserPhone = @SiteUserPhone,
SiteUserPassword = @SiteUserPassword,
SiteUserType = @SiteUserType,
CompanyID = @CompanyID,
SiteUserActive = @SiteUserActive
WHERE SiteUserID =
@SiteUserID
";
}
SqlCommand cmd = new SqlCommand(sql, conn);
SqlParameter siteUserIDParam = new SqlParameter("@siteUserID", SqlDbType.Int);
SqlParameter siteUserFirstNameParam = new SqlParameter("@siteUserFirstName", SqlDbType.VarChar);
SqlParameter siteUserLastNameParam = new SqlParameter("@siteUserLastName", SqlDbType.VarChar);
SqlParameter siteUserTitleParam = new SqlParameter("@siteUserTitle", SqlDbType.VarChar);
SqlParameter siteUserEmailParam = new SqlParameter("@siteUserEmail", SqlDbType.VarChar);
SqlParameter siteUserPhoneParam = new SqlParameter("@siteUserPhone", SqlDbType.VarChar);
SqlParameter siteUserPasswordParam = new SqlParameter("@siteUserPassword", SqlDbType.VarChar);
SqlParameter siteUserTypeParam = new SqlParameter("@siteUserType", SqlDbType.Int);
SqlParameter companyIDParam = new SqlParameter("@companyID", SqlDbType.Int);
SqlParameter siteUserActiveParam = new SqlParameter("@siteUserActive", SqlDbType.Bit);
siteUserIDParam.Value = siteUserID;
siteUserFirstNameParam.Value = siteUserFirstName;
siteUserLastNameParam.Value = siteUserLastName;
siteUserTitleParam.Value = siteUserTitle;
siteUserEmailParam.Value = siteUserEmail;
siteUserPhoneParam.Value = siteUserPhone;
siteUserPasswordParam.Value = siteUserPassword;
siteUserTypeParam.Value = siteUserType;
companyIDParam.Value = companyID;
siteUserActiveParam.Value = siteUserActive;
cmd.Parameters.Add(siteUserIDParam);
cmd.Parameters.Add(siteUserFirstNameParam);
cmd.Parameters.Add(siteUserLastNameParam);
cmd.Parameters.Add(siteUserTitleParam);
cmd.Parameters.Add(siteUserEmailParam);
cmd.Parameters.Add(siteUserPhoneParam);
cmd.Parameters.Add(siteUserPasswordParam);
cmd.Parameters.Add(siteUserTypeParam);
cmd.Parameters.Add(companyIDParam);
cmd.Parameters.Add(siteUserActiveParam);
conn.Open();
cmd.ExecuteNonQuery();
conn.Close();
return 0;
}
}
答案 0 :(得分：1)
执行脚本时，请使用ExecuteScalar代替ExecuteNonQuery，并将结果转换为int。该脚本仍会产生插入行的副作用，但它的值将是作用域标识。