mysql - 从mysql中的xml中提取值

Question

我正在尝试从 xml 中提取值。当 xml 具有属性时，我遇到了问题。就像下面的存储过程

DELIMITER $$
DROP PROCEDURE IF EXISTS `excel`.`insert_items` $$
CREATE DEFINER=`root`@`localhost` PROCEDURE `insert_items`()
BEGIN
SET @xml = '<items><item>
        <value columntype="0">Single Line Text_01</value>
    <value columntype="1">Single Line Text_12341</value>
    <value columntype="2">Single Line Text_21</value>
    <value columntype="3">Single Line Text_31</value>
    <value columntype="4">Single Line Text_41</value>
    </item>
</items>';
SELECT @columntype, ExtractValue(@xml, 'items/item/value[items/item/value/@columntype=0]');    
END $$
DELIMITER ;

Answer 1

获取具有属性 columntype="0" 的元素的值

SELECT ExtractValue(@xml, 'items/item/value[@columntype=0]') value;

输出:

|               VALUE |
-----------------------
| Single Line Text_01 |

SQLFiddle