“ where子句”中的未知列“ x”

Question

我正在使用MySql和Delphi。 下面的代碼我怎么了？

我在“ where子句”中收到“未知列'x'”錯誤->在'where子句'中未知列'_code_ehda_konandeh'我因此需要它。 我必須做這個項目2天后........

---

   DELIMITER $$

USE `bimarestan`$$

DROP PROCEDURE IF EXISTS `Save_Ehda_Konande`$$

CREATE DEFINER=`root`@`localhost` PROCEDURE `Save_Ehda_Konande`(
IN _code_ehda_konandeh VARCHAR(50),
IN _tarikh_moarefi VARCHAR(50),
IN _tarikh_tashkil_parvandeh VARCHAR(50),
IN _name VARCHAR(50),
IN _name_khanevadegi VARCHAR(50),
IN _name_pedar VARCHAR(50),
IN _tarikh_tavalod VARCHAR(20),
IN _tahsilat VARCHAR(50),
IN _vaziyat_taahol VARCHAR(50),
IN _noe_bimeh VARCHAR(50),
IN _gorooh_khoon VARCHAR(50),
IN _rezayat_dahandeh VARCHAR(50),
IN _shoghl VARCHAR(50),
IN _address VARCHAR(50),
IN _telphone VARCHAR(50),
OUT _out INT)
BEGIN
IF LTRIM(RTRIM(_code_ehda_konandeh))<>'' THEN
 BEGIN
 SET _out = 0;
  IF NOT EXISTS(SELECT * FROM bimar WHERE `_code_ehda_konandeh` = `code_ehda_konandeh`) THEN
    INSERT INTO `ehda_konandeh` (
code_ehda_konandeh,
tarikh_moarefi,
tarikh_tashkil_parvandeh,
NAME,
name_khanevadegi,
name_pedar,
tarikh_tavalod,
tahsilat,
vaziyat_taahol,
noe_bimeh,
gorooh_khoon,
rezayat_dahandeh,
shoghl,
address,
telphone)
    VALUES(
_code_ehda_konandeh,
_tarikh_moarefi,
_tarikh_tashkil_parvandeh,
_name,
_name_khanevadegi,
_name_pedar,
_tarikh_tavalod,
_tahsilat,
_vaziyat_taahol,
_noe_bimeh,
_gorooh_khoon,
_rezayat_dahandeh,
_shoghl,
_address,
_telphone
);
  ELSE
    SET _out = 1;  
  END IF;
    END; 
END IF;
END$$

DELIMITER ;

---

在MySql上存儲的Proc運行沒有任何問題，但是當我想向其發送delphi參數時，我得到了該錯誤！

這是我的delphi代碼：

if flag_new_edit = 1 then
  sp_sabt.StoredProcName := 'Save_Ehda_Konande'
 else
  sp_sabt.StoredProcName := 'Edit_Ehda_Konande';
   With sp_sabt Do
   Begin
   ParamByName('_code_ehda_konandeh').Value := Trim(txt_code_ehda_konande.Text);
   ParamByName('_tarikh_moarefi').Value := Trim(txt_tarikh_tavalod.Text);
   ParamByName('_tarikh_tashkil_parvandeh').Value := Trim(txt_name_khanevadegi.Text);
   ParamByName('_name').Value := Trim(txt_name.Text);
   ParamByName('_name_khanevadegi').Value := Trim(txt_name_khanevadegi.Text);
   ParamByName('_name_pedar').Value := Trim(txt_name_pedar.Text);
   ParamByName('_tarikh_tavalod').Value := Trim(txt_tarikh_tavalod.Text);
   ParamByName('_tahsilat').Value := Trim(cmb_tahsilat.Text);
   ParamByName('_vaziyat_taahol').Value := Trim(cmb_vaziyat_taahol.Text);
   ParamByName('_noe_bimeh').Value := Trim(cmb_noe_bime.Text);
   ParamByName('_gorooh_khoon').Value := Trim(cmb_gorooh_khoon.Text);
   ParamByName('_rezayat_dahandeh').Value := Trim(txt_rezayat_dahande.Text);
   ParamByName('_shoghl').Value := Trim(txt_shoghl.Text);
   ParamByName('_address').Value := Trim(txt_adress.Text);
   ParamByName('_telphone').Value := Trim(txt_tel.Text);
   ExecProc;
End;

問候

Answer 1

  IF NOT EXISTS(SELECT * FROM bimar WHERE `_code_ehda_konandeh` = `code_ehda_konandeh`) THEN
                                          ^---                ^---

刪除指示的引號。 反引號用於“轉義”保留字。 它們還強制MySQL將那些轉義的單詞視為字段/表名。 您的參數不是字段，因此MySQL被迫錯誤地解釋它們。

Answer 2

盡管我指出了您的sql代碼中的錯誤，但我想提供更多詳細信息。

That Stored Procedure Runing at MySql WithOut any problems but when send Delphi parameters to sp , i get that Error !! 但是你錯了。

您的過程創建中存在a known bug 。 由於該原因，引發了運行時異常 。
Semantics of Stored procedure code is not checked at CREATE time. At runtime, undeclared variables are detected, and an error message is generated for each reference to an undeclared variable. However, SP's seem to believe any reference denotes a column, even though the syntactic context excludes that. This leads to a very confusing error message in case the procedure.

標准測試示例如下所示：

mysql> drop procedure proc_test;
Query OK, 0 rows affected (0.00 sec)

mysql> delimiter //
mysql> CREATE PROCEDURE proc_test()
    -> BEGIN
    ->     select current_day;
    -> END
    -> //
Query OK, 0 rows affected (0.00 sec)

在這里，您可以了解current day被忽略的過程編譯。

mysql> delimiter ;
mysql> call proc_test();
ERROR 1054 (42S22): Unknown column 'current_day' in 'field list'
mysql>

有了這個，您應該理解That Stored Procedure Runing at MySql WithOut any problems ...而沒有That Stored Procedure Runing at MySql WithOut any problems ...是不正確的。

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快速解決您的查詢將解決此問題。 您提到I defined input parameters with _ prefix. I don't know waht i must do ! I defined input parameters with _ prefix. I don't know waht i must do ! 。 如果是這樣的話
更改

SELECT * FROM bimar WHERE `_code_ehda_konandeh` = `code_ehda_konandeh`

至

SELECT * FROM bimar WHERE `code_ehda_konandeh` = _code_ehda_konandeh

它應該正在工作。 在這里，我還假定code_ehda_konandeh也是表bimar一列。