mysql - 是否可以在 MySQL 中搜索和替换字符串数组？

Question

考虑以下数组:

"Bank of America"    => "BOA",
"Microsoft"          => "MSFT",
"Berkshire Hathaway" => "BRK"

实际上，该数组有 100 对长。如果我有一个带有文本记录的 MySQL 表“字符串”:

str_id  str_text
-------------------------------------------------------------
1       I wish I had bought Berkshire Hathaway in the 1980's!
2       Microsoft to release Windows 8 in 4 flavours

有没有办法 - 在 SQL 中! - 循环遍历所有数百万条记录并用其股票代码替换所有公司名称？那么当查询完成时，字符串表将如下所示？

str_id  str_text
-------------------------------------------------------------
1       I wish I had bought BRK in the 1980's!
2       MSFT to release Windows 8 in 4 flavours

我之所以这么问，是因为使用 PHP 是可能的，但这本质上会比较慢，因为我必须检索几千条记录，循环遍历它们，更新它们，使用 crontab 等检索更多数千条记录。

Answer 1

不使用 PHP 的替代方案(仅限 MySQL):

创建MySQL过程:

    DELIMITER // 
    DROP PROCEDURE IF EXISTS replace_strings// 
    CREATE PROCEDURE replace_strings(IN table_name VARCHAR(100), IN field_name VARCHAR(100))

    BEGIN

    DECLARE done INT DEFAULT FALSE;
    DECLARE str_from VARCHAR(255);
    DECLARE str_to VARCHAR(255);
    DECLARE cur1 CURSOR FOR SELECT string_from, string_to FROM replacements;
    DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;
    OPEN cur1;

    read_loop: LOOP
        FETCH cur1 INTO str_from, str_to;
        IF done THEN
            LEAVE read_loop;
        END IF;

    SET @sql_command = CONCAT("UPDATE ",table_name," SET ",field_name," = REPLACE(",field_name,", '",str_from,"', '",str_to,"')");
    PREPARE stmt FROM @sql_command;
    EXECUTE stmt;
    DEALLOCATE PREPARE stmt;

    END LOOP;

    CLOSE cur1;

    END // 
    DELIMITER ;

使用字段 string_from 和 string_to 创建表replacements。向该表添加可能的自动更改。

在代码中使用过程调用:

    CALL replace_strings('strings','str_text');