Oracle - 将 IF 语句转换为 WHERE 子句

Question

我应该将 C# 代码翻译成 Oracle 中的存储过程。

我在 where 中写了一个带有大小写的存储过程，但没有返回正确的数据。我哪里错了？

问题是管理输入参数的IF。

甲骨文：

CREATE OR REPLACE PROCEDURE SP_S_RICCFEMESSE 
(
    NUMEROCV        IN VARCHAR2,
    PROFILO         IN NUMBER,
    SALAES          IN NUMBER,
    DATAINIZIO      IN VARCHAR2,
    DATAFINE        IN VARCHAR2,
    ric_carteemesse OUT SYS_REFCURSOR
)
AS 
BEGIN
    OPEN ric_carteemesse FOR
       SELECT DISTINCT A.*
                ,DESCARDPRFCFR AS TIPO_CARTA
                ,TO_CHAR(DATNAS,'DD/MM/YYYY') AS DATA_DI_NASCITA 
                ,TO_CHAR(A.DATIVOPSA,'DD/MM/YYYY HH24:MI:SS') AS DATA_EMISSIONE 
                ,TO_CHAR(DATINIVALRTA,'DD/MM/YYYY') AS INIZIO_VALIDITA_CARTA 
                ,TO_CHAR(DATFINIVALRTA,'DD/MM/YYYY') AS FINE_VALIDITA_CARTA 
                ,C.S_DENOMINAZIONE AS SALA_ES 
                ,CASE 
                    WHEN NVL(SCDUP,0) = '0' 
                    THEN 'NO' 
                    WHEN SCDUP > 0 
                    THEN 'SI' 
                END AS DUPLICATO 
FROM 
DEMIRTAFRC A 
INNER JOIN SMART_CARD B 
    ON A.CODSRE = B.COD_SM 
LEFT JOIN RIVENDITA C 
    ON B.S_POSTAZIONE_UM = TO_CHAR(C.COD_RIVENDITA) 
INNER JOIN DANACARDPRFCFR D ON A.CODPRF= D.CARDPRFCFR 
WHERE 
    (B.D_ELETTRIFICAZIONE BETWEEN TO_DATE(DATAINIZIO,'DD/MM/YYYY') AND TO_DATE(DATAFINE,'DD/MM/YYYY') 
    AND A.MDLCSG = 'CBM' AND CODSRE IS NOT NULL)
    AND NUMEROCV = (CASE WHEN NUMEROCV <> '' 
                         THEN A.CODRTA
                         ELSE null 
                    END)
    AND PROFILO = (CASE WHEN PROFILO <> 0 
                        THEN B.COD_REQUISITI
                        ELSE null 
                   END)
    AND SALAES = (CASE WHEN SALAES <> 999
                       THEN B.S_POSTAZIONE_UM
                       ELSE null 
                  END)
ORDER BY A.DATETR DESC;

END SP_S_RICCFEMESSE;

这是要替换的 C# 代码：

if (_NumCV.ToString().Trim() != "")
                _cmd.CommandText += " AND A.CODRTA = '" + _NumCV + "' ";

            if (_Profilo != 0)
                _cmd.CommandText += " AND B.COD_REQUISITI = " + _Profilo;

            if (_SalaES != 999)
                _cmd.CommandText += " AND B.S_POSTAZIONE_UM = '" + _SalaES + "' ";

Answer 1

NULL 从不等于 NULL。因此，如果任何 CASE 语句进入 ELSE 分支，则该语句将评估为 FALSE。此外，在 Oracle 中，空字符串与 NULL 相同（是的，这是有争议的，但 Oracle 已经这样做了将近 40 年，就是这样），这意味着这总是 FALSE：NUMEROCV <> ''。

简单的解决方案是，不要在 WHERE 子句中使用 CASE。这更清楚：

AND (NUMEROCV is null or NUMEROCV = A.CODRTA)
AND (PROFILO = 0 or PROFILO = B.COD_REQUISITI)
AND (SALAES = 999 or SALAES = B.S_POSTAZIONE_UM))

Answer 2

您在 PROFILO、SALAES、NUMEROCV 列中是否有空值。 如果是，那么您必须在 where 部分的此列上设置 nvl。

因为你 c# 说你可能有 null 试试这个：

 CREATE OR REPLACE PROCEDURE SP_S_RICCFEMESSE 
(
    NUMEROCV        IN VARCHAR2,
    PROFILO         IN NUMBER,
    SALAES          IN NUMBER,
    DATAINIZIO      IN VARCHAR2,
    DATAFINE        IN VARCHAR2,
    ric_carteemesse OUT SYS_REFCURSOR
)


AS 
BEGIN

OPEN ric_carteemesse FOR
SELECT DISTINCT A.*
                ,DESCARDPRFCFR AS TIPO_CARTA
                ,TO_CHAR(DATNAS,'DD/MM/YYYY') AS DATA_DI_NASCITA 
                ,TO_CHAR(A.DATIVOPSA,'DD/MM/YYYY HH24:MI:SS') AS DATA_EMISSIONE 
                ,TO_CHAR(DATINIVALRTA,'DD/MM/YYYY') AS INIZIO_VALIDITA_CARTA 
                ,TO_CHAR(DATFINIVALRTA,'DD/MM/YYYY') AS FINE_VALIDITA_CARTA 
                ,C.S_DENOMINAZIONE AS SALA_ES 
                ,CASE 
                    WHEN NVL(SCDUP,0) = '0' 
                    THEN 'NO' 
                    WHEN SCDUP > 0 
                    THEN 'SI' 
                END AS DUPLICATO 
FROM 
DEMIRTAFRC A 
INNER JOIN SMART_CARD B 
    ON A.CODSRE = B.COD_SM 
LEFT JOIN RIVENDITA C 
    ON B.S_POSTAZIONE_UM = TO_CHAR(C.COD_RIVENDITA) 
INNER JOIN DANACARDPRFCFR D ON A.CODPRF= D.CARDPRFCFR 
WHERE 
    (B.D_ELETTRIFICAZIONE BETWEEN TO_DATE(DATAINIZIO,'DD/MM/YYYY') AND TO_DATE(DATAFINE,'DD/MM/YYYY') 
    AND A.MDLCSG = 'CBM' AND CODSRE IS NOT NULL)
    AND nvl(NUMEROCV, ' ') = (CASE WHEN nvl(NUMEROCV, ' ') <> ' ' 
                         THEN A.CODRTA
                         ELSE null 
                    END)
    AND nvl(PROFILO, 0) = (CASE WHEN nvl(PROFILO, 0) <> 0 
                        THEN B.COD_REQUISITI
                        ELSE null 
                   END)
    AND NVL(SALAES, 0) = (CASE WHEN NVL(SALAES, 0) <> 999
                       THEN B.S_POSTAZIONE_UM
                       ELSE null 
                  END)
ORDER BY A.DATETR DESC;

END SP_S_RICCFEMESSE;

Answer 3

如果你有很多条件，你可以动态构建 sql

声明 sql_statement

sql_statement VARCHAR2(...);

sql_statement := 'SELECT .... WHERE ' // your select

IF PROFILO <> 0 THEN // your criteria here
    sql_statement := sql_statement || ' AND B.COD_REQUISITI = ' || PROFILO // your criteria here;

EXECUTE IMMEDIATE(sql_statement);