将公式转换为数字列表的 MySQL 过程

Question

我有一个字母数字字符串列表，其中包括两个特殊字符

+

和

-

。如下所示，输入代表我们公司产品的部件号。我想提取各个组件作为输出。大约有 45,000 种产品，下面的数据是部件号的示例。如何解析此字符串以区分

+

和

-

并提供正确的输出？

我不确定如何区分

-

指示的范围和

+

指示的加法。

Answer 1

创建程序：

DELIMITER //

CREATE PROCEDURE ConvertRangesToList(input_string VARCHAR(255))
BEGIN
    DECLARE output_list VARCHAR(255) DEFAULT '';
    DECLARE current_part VARCHAR(255);
    DECLARE range_start INT;
    DECLARE range_end INT;
    DECLARE range_separator_pos INT;
    DECLARE plus_separator_pos INT;
    DECLARE current_number INT;
    DECLARE delimiter_pos INT;

    -- Replace '+' with ','
    SET input_string = REPLACE(input_string, '+', ',');

    -- Add a comma at the end to ensure the last number is processed
    SET input_string = CONCAT(input_string, ',');

    -- Process each part of the input string
    WHILE LENGTH(input_string) > 0 DO
        -- Find the position of the next comma delimiter
        SET delimiter_pos = INSTR(input_string, ',');
        -- Extract the current part
        SET current_part = TRIM(SUBSTRING(input_string, 1, delimiter_pos - 1));
        -- Remove the processed part from the input string
        SET input_string = SUBSTRING(input_string, delimiter_pos + 1);

        -- Find the position of the range separator '-'
        SET range_separator_pos = INSTR(current_part, '-');
        IF range_separator_pos > 0 THEN
            -- If a range separator is found
            SET range_start = CAST(SUBSTRING_INDEX(current_part, '-', 1) AS UNSIGNED);
            SET range_end = CAST(SUBSTRING_INDEX(current_part, '-', -1) AS UNSIGNED);

            -- Append the range to the output list
            WHILE range_start <= range_end DO
                SET output_list = CONCAT(output_list, IF(output_list = '', '', ','), range_start);
                SET range_start = range_start + 1;
            END WHILE;
        ELSE
            -- If no range separator is found, it's a single number
            SET current_number = CAST(current_part AS UNSIGNED);
            SET output_list = CONCAT(output_list, IF(output_list = '', '', ','), current_number);
        END IF;
    END WHILE;

    SELECT output_list AS Output;
END//

DELIMITER ;

并称其为：

CALL ConvertRangesToList('1-12+20');

要点：将公式转换为数字列表的 MySQL 程序