缺少参数名称，通过代码执行函数时

Question

我正在尝试执行以下代码

 Dim transaction As PgSqlTransaction
    Dim command As New PgSqlCommand
    Dim paramLastNo As PgSqlParameter = command.Parameters.Add("funcUpdategtab03", PgSqlType.Int)
    command.Connection = Myconnstr
    Myconnstr.Open()
    command.Transaction = transaction
    transaction = command.Connection.BeginTransaction()
    Try
        command.CommandText = _
        "select funcUpdategtab03(" & SORD & "," & gintAcYrId & "," & gintBranchId & ");"
        command.ExecuteScalar()
        updateGtab03 = paramLastNo.Value
        transaction.Commit()

        Return updateGtab03
    Catch ex As Exception
        transaction.Rollback()
        MsgBox(ex.Message, MsgBoxStyle.Information, "RStari9 - updateGtab03")
    Catch ex As Exception
        transaction.Rollback()
        MsgBox(ex.Message, MsgBoxStyle.Information, "RStari9 - updateGtab03")
    Finally
        Myconnstr.Close()
    End Try

我创建的函数是

    CREATE OR REPLACE FUNCTION funcupdategtab03(ivrid integer, iacyrid integer, ibranchid integer)
  RETURNS integer AS
$BODY$
declare id_val int;
BEGIN
   UPDATE GTAB03 SET lastno=lastno+1 where vrid=ivrid and acyrid=iacyrid and BranchID=ibranchid RETURNING lastno into id_val;

return id_val;
END;
$BODY$
  LANGUAGE plpgsql VOLATILE
  COST 100;

• 上述函数用于更新表 得到的错误如下

错误参数名称丢失。

Answer 1

您已经创建了一个输入参数并尝试将其用作输出参数。查询中根本没有使用该参数，因此无法获取值，并且查询实际返回的结果被忽略。

去掉参数，通过ExecuteScalar方法得到结果：

updateGtab03 = command.ExecuteScalar()

但是，您应该考虑对三个输入值使用参数，而不是将它们连接到查询中。