具有IN子句参数的Oracle存储过程 [英] Oracle stored procedure with parameters for IN clause

问题描述

如何创建一个Oracle存储过程，该存储过程接受用于输入IN子句的可变数量的参数值?

How can I create an Oracle stored procedure which accepts a variable number of parameter values used to feed a IN clause?

这是我想要达到的目标.我不知道如何在PLSQL中声明要传递要更新的行的主键的变量列表.

This is what I am trying to achieve. I do not know how to declare in PLSQL for passing a variable list of primary keys of the rows I want to update.

FUNCTION EXECUTE_UPDATE
  ( <parameter_list>
   value IN int)
  RETURN  int IS
BEGIN 
    [...other statements...]
    update table1 set col1 = col1 - value where id in (<parameter_list>) 

    RETURN SQL%ROWCOUNT ;
END;

此外，我想从C#调用此过程，因此它必须与.NET功能兼容.

Also, I would like to call this procedure from C#, so it must be compatible with .NET capabilities.

谢谢， 罗伯特

推荐答案

使用CSV可能是最简单的方法，假设您可以100％确定您的元素本身不会包含字符串.

Using CSV is probably the simplest way, assuming you can be 100% certain that your elements won't themselves contain strings.

一种替代的方法，也许是更强大的方法，是将自定义类型创建为字符串表.假设您的字符串长度不超过100个字符，那么您可以:

An alternative, and probably more robust, way of doing this is to create a custom type as a table of strings. Supposing your strings were never longer than 100 characters, then you could have:

CREATE TYPE string_table AS TABLE OF varchar2(100);

然后，您可以将这种类型的变量传递到您的存储过程中，并直接对其进行引用.您的情况是这样的:

You can then pass a variable of this type into your stored procedure and reference it directly. In your case, something like this:

FUNCTION EXECUTE_UPDATE(
    identifierList string_table,
    value int)
RETURN int
IS
BEGIN

    [...other stuff...]

    update table1 set col1 = col1 - value 
    where id in (select column_value from table(identifierList));

    RETURN SQL%ROWCOUNT;

END

table()函数将您的自定义类型转换为带有单列"COLUMN_VALUE"的表，然后您可以将其像任何其他表一样对待(联接也可以，在这种情况下，也可以是子选择).

The table() function turns your custom type into a table with a single column "COLUMN_VALUE", which you can then treat like any other table (so do joins or, in this case, subselects).

这样做的好处是Oracle会为您创建一个构造函数，因此在调用存储过程时，您可以简单地编写:

The beauty of this is that Oracle will create a constructor for you, so when calling your stored procedure you can simply write:

execute_update(string_table('foo','bar','baz'), 32);

我假设您可以通过C#以编程方式处理此命令.

I'm assuming that you can handle building up this command programatically from C#.

顺便说一句，在我公司，我们有许多这样的自定义类型，它们被定义为标准的字符串，双精度型，整型等列表.我们还利用 Oracle JPublisher 来将这些类型直接映射到相应的Java对象.我快速浏览了一下，但是看不到C#的任何直接等效项.只是以为我提到了它，以防Java开发人员遇到这个问题.

As an aside, at my company we have a number of these custom types defined as standard for lists of strings, doubles, ints and so on. We also make use of Oracle JPublisher to be able to map directly from these types into corresponding Java objects. I had a quick look around but I couldn't see any direct equivalents for C#. Just thought I'd mention it in case Java devs come across this question.

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