如何在MySQL存储过程中传递字符串列表? [英] How to Pass a List of String in MySQL Stored Procedure?

问题描述

我正在尝试在MySQL存储过程中将数组作为字符串传递，但无法正常工作.

I'm trying to pass an array as a String in MySQL Stored Procedure but it doesn't work fine.

这是我的SQL代码:

CREATE DEFINER=`root`@`localhost` PROCEDURE `search_equipment`(IN equip VARCHAR(100), IN category VARCHAR(255))
BEGIN
    SELECT *
        FROM Equipment
        WHERE e_description
        LIKE CONCAT("%",equip,"%")
            AND e_type IN (category)
END

这是我如何调用该过程:

And here's how i call the procedure:

String type = "'I.T. Equipment','Office Supply'";

CALL search_equipment('some equipment', type);

有什么想法吗?

推荐答案

您的朋友在这里是FIND_IN_SET.我首先在此问题中遇到了该方法:也在此问题中涉及

Your friend here is FIND_IN_SET I expect. I first came across that method in this question : also covered in this question MYSQL - Stored Procedure Utilising Comma Separated String As Variable Input

有关FIND_IN_SET的MySQL文档，请参见 http://dev.mysql.com/doc/refman/5.0/zh-CN/string-functions.html#function_find-in-set

MySQL documention for FIND_IN_SET is here http://dev.mysql.com/doc/refman/5.0/en/string-functions.html#function_find-in-set

所以您的程序将变成

CREATE DEFINER=`root`@`localhost` 
PROCEDURE `search_equipment`(
    IN equip VARCHAR(100), 
    IN category VARCHAR(255)
)
BEGIN
    SELECT *
    FROM Equipment
    WHERE e_description LIKE CONCAT("%",equip,"%")
    AND FIND_IN_SET(e_type,category)
END

这取决于类别字符串是一个逗号分隔的列表，因此您的呼叫代码将变为

This relies on the category string being a comma-delimited list, and so your calling code becomes

String type = "I.T. Equipment,Office Supply";

CALL search_equipment('some equipment', type);

(p.s.修正了一个错字，在您输入参数时输入了类别)

(p.s. fixed a typo, in your arguments you had typed categoy)

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