Question

我们正在使用与.net（MVC）和Oracle数据库配合使用的软件。之后，我们不得不在新服务器中安装新版本的Oracle（12.1.0），我们在搜索时会遇到此错误，而在12.2.0版中则没有此类错误。错误：

ORA-01425：转义字符必须是长度为1的字符串

我的查询在这里

availableTasks.Where(task => task.Document.RegistrationNumber.Contains(searchkeyWord) || task.WorkflowNumber.Contains(searchkeyWord) || task.Description.Contains(searchkeyWord));

值得一提的是，当我删除task.Document.RegistrationNumber.Contains(searchkeyWord)或task.WorkflowNumber.Contains(searchkeyWord) || task.Description.Contains(searchkeyWord)时，效果很好。

我的查询输出来自Linq：

SELECT 
"GroupBy1"."A1" AS "C1"
FROM ( SELECT 
    COUNT(1) AS "A1"
    FROM   (SELECT "Extent1"."Id" AS "Id1", "Extent1"."Document_Id" AS "Document_Id", "Extent1"."Member_Id" AS "Member_Id", "Extent1"."Command_Id" AS "Command_Id", "Extent1"."InitialTask_Id" AS "InitialTask_Id", "Extent1"."Sender_Id" AS "Sender_Id", "Extent1"."Receiver_Id" AS "Receiver_Id", "Extent1"."Department_Id" AS "Department_Id", "Extent1"."PreviousTask_Id" AS "PreviousTask_Id", "Extent1"."OpeningTime" AS "OpeningTime", "Extent1"."ClosingTime" AS "ClosingTime", "Extent1"."IsDone" AS "IsDone", "Extent1"."Description" AS "Description", "Extent1"."MetaData" AS "MetaData", "Extent1"."WorkflowNumber" AS "WorkflowNumber", "Extent1"."Comment" AS "Comment", "Extent2"."Id" AS "Id2", "Extent2"."PortCommunity_Id" AS "PortCommunity_Id", "Extent2"."Accessibility_Id" AS "Accessibility_Id", "Extent2"."IssuedUser_Id" AS "IssuedUser_Id", "Extent2"."ChangingTime" AS "ChangingTime", "Extent2"."RegistrationNumber" AS "RegistrationNumber", "Extent2"."RegistrationDate" AS "RegistrationDate", "Extent2"."SequenceNumber" AS "SequenceNumber", "Extent2"."DocumentStatus" AS "DocumentStatus", "Extent2"."DocumentType" AS "DocumentType"
        FROM  "KISH"."Task" "Extent1"
        INNER JOIN "KISH"."Document" "Extent2" ON "Extent1"."Document_Id" = "Extent2"."Id"
        WHERE ("Extent1"."IsDone" <> 1) ) "Filter1"
    LEFT OUTER JOIN "KISH"."User" "Extent3" ON "Filter1"."Receiver_Id" = "Extent3"."Id"
    WHERE (((("Filter1"."Member_Id" = :p__linq__0) AND ("Filter1"."Command_Id" = :p__linq__1)) OR ("Filter1"."Command_Id" <> :p__linq__2)) AND ("Filter1"."PortCommunity_Id" = :p__linq__3) AND ((:p__linq__4 <> 1) OR ("Filter1"."Receiver_Id" IS NULL) OR ("Filter1"."Receiver_Id" = :p__linq__5)) AND ( EXISTS (SELECT 
        1 AS "C1"
        FROM "KISH"."Permission" "Extent4"
        WHERE (("Extent4"."User_Id" = :p__linq__6) AND ("Extent4"."Member_Id" = :p__linq__7) AND ("Extent4"."PortCommunity_Id" = :p__linq__8) AND ( EXISTS (SELECT 
            1 AS "C1"
            FROM "KISH"."RoleCommand" "Extent5"
            WHERE (("Extent4"."Role_Id" = "Extent5"."Role_Id") AND ("Extent5"."Command_Id" = "Filter1"."Command_Id"))
        )) AND (("Extent4"."Department_Id" IS NULL) OR ("Filter1"."Department_Id" IS NULL) OR ("Extent4"."Department_Id" = "Filter1"."Department_Id") OR (("Extent4"."Department_Id" IS NULL) AND ("Filter1"."Department_Id" IS NULL))))
    )) AND (("Filter1"."RegistrationNumber" LIKE :p__linq__9 ESCAPE '\') OR ("Filter1"."WorkflowNumber" LIKE :p__linq__10 ESCAPE '\') OR ("Filter1"."Description" LIKE :p__linq__11 ESCAPE '\')))
)  "GroupBy1"SQL: 
SQL: -- p__linq__0: 'db717061-06f1-4235-8413-1d76f65ba80f' (Type = Binary, IsNullable = false)
SQL: -- p__linq__1: '19ccc777-634f-43c6-a5d3-037ae78be91c' (Type = Binary, IsNullable = false)
SQL: -- p__linq__2: '19ccc777-634f-43c6-a5d3-037ae78be91c' (Type = Binary, IsNullable = false)
SQL: -- p__linq__3: '04922971-1ea5-4f76-8de6-13b6e460364b' (Type = Binary, IsNullable = false)
SQL: -- p__linq__4: 'True' (Type = Decimal, IsNullable = false)
SQL: -- p__linq__5: '1d0c0570-9dd0-4aa4-92d7-8055b567c351' (Type = Binary, IsNullable = false)
SQL: -- p__linq__6: '1d0c0570-9dd0-4aa4-92d7-8055b567c351' (Type = Binary, IsNullable = false)
SQL: -- p__linq__7: 'db717061-06f1-4235-8413-1d76f65ba80f' (Type = Binary, IsNullable = false)
SQL: -- p__linq__8: '04922971-1ea5-4f76-8de6-13b6e460364b' (Type = Binary, IsNullable = false)
SQL: -- p__linq__9: '%30%' (Type = Object)
SQL: -- p__linq__10: '%30%' (Type = Object)
SQL: -- p__linq__11: '%30%' (Type = Object)

我完全被这个问题弄糊涂了。我不知道它是针对其他Oracle版本还是其他版本。

Answer 1

在某些情况下直接处理Contains()自变量时，在LINQ中使用Entity Framework ODP实现System.String方法似乎无法正常工作，它将通过LIKE语句生成ESCAPE '\'在PL / SQL查询中将引发ORA-01425错误（如similar issue here中所示）。要缓解这种行为，只需对字符串参数使用Trim()方法内的Contains()：

availableTasks.Where(task => task.Document.RegistrationNumber.Contains(searchkeyWord.Trim()) 
                     || task.WorkflowNumber.Contains(searchkeyWord.Trim()) 
                     || task.Description.Contains(searchkeyWord.Trim()));

Trim()方法将生成INSTR和TRIM条语句（或LTRIM-RTRIM对），以LIKE替换为{{ 1}}语句，如下例所示：

ESCAPE

通过使用SELECT <snip> FROM <snip> WHERE [condition] AND ((NVL(INSTR("Filter1"."RegistrationNumber", TRIM(:p__linq__9)), 0)) > 0) OR ((NVL(INSTR("Filter1"."WorkflowNumber", TRIM(:p__linq__10)), 0)) > 0) OR ((NVL(INSTR("Filter1"."Description", TRIM(:p__linq__11)), 0)) > 0)实现INSTR，在处理包含TRIM值的LINQ生成的参数（:p__linq__XX）时，查询将平稳运行。

Answer 2

您发布的SQL语句中的ESCAPE很好-ESCAPE '\'

但这是 LINQ

记录的查询文本

查看实际查询语句发送到数据库的最佳方法是激活 10046跟踪。

 ALTER SESSION SET tracefile_identifier = escape;
 alter session set events '10046 trace name context forever, level 12';

在您的连接中运行语句。

您将在数据库服务器的跟踪文件夹中找到诸如xxx_ora_NNNN_ESCAPE.trc之类的文件。

我怀疑您会看到类似

的语句

escape '\\'

Answer 3

我们有同样的问题

通过将参数CURSOR_SHARING更改为EXACT

来解决

Answer 4

select emp.emp_id from employee emp where emp.NAME like '%\\_%' ESCAPE '\\';

ORA-01425：转义字符必须是长度为1的字符串

4 个答案: