MySQL存储过程返回多个参数

Question

我不喜欢存储过程。现在我有一个可以工作的，但我想学习如何优化它。

CREATE DEFINER=`simonh`@`%` PROCEDURE `get_normalized_client_id`(IN source_id INT, IN source_division VARCHAR(255), IN source_currency VARCHAR(255), OUT NORMALIZED_ID INT, OUT NAME VARCHAR(255), OUT ADDRESS VARCHAR(255))
BEGIN

IF source_id > 100000 THEN SET source_id = source_id - 100000; END IF;

SELECT
CLIENT.NEW_GROUP_REFERENCE_NUMBER INTO NORMALIZED_ID
FROM ccis_vendors.client_id SOURCE
INNER JOIN ccis_vendors.receivable CLIENT ON CLIENT.id = SOURCE.ACCOUNT_ID
WHERE SOURCE.number = source_id AND SOURCE.division = source_division;

SELECT
CLIENT.name INTO NAME
FROM ccis_vendors.client_id SOURCE
INNER JOIN ccis_vendors.receivable CLIENT ON CLIENT.id = SOURCE.ACCOUNT_ID
WHERE SOURCE.number = source_id AND SOURCE.division = source_division;

SELECT
CONCAT(IFNULL(CLIENT.OPERATION_STREET,''), ' ', IFNULL(CLIENT.OPERATION_CITY,''), ' ', 
IFNULL(CLIENT.OPERATION_STATE_PROVINCE, ''), ' ', IFNULL(CLIENT.OPERATION_ZIP, '')) INTO ADDRESS
FROM ccis_vendors.client_id SOURCE
INNER JOIN ccis_vendors.receivable CLIENT ON CLIENT.id =  SOURCE.ACCOUNT_ID
WHERE SOURCE.number = source_id AND SOURCE.division = source_division;

END

如您所见，我使用相同的查询 3 次来填充 3 个 OUT 参数。

我的问题是，有没有办法只用一个查询来做到这一点？

谢谢。

编辑： 我明白为什么 INTO 现在不适合我了。语法错误。

这是工作版本：

CREATE PROCEDURE `t_get_normalized_client_id`(IN source_id INT, IN source_division VARCHAR(255), IN source_currency VARCHAR(255), OUT NORMALIZED_ID INT, OUT NAME VARCHAR(255), OUT ADDRESS VARCHAR(255))
BEGIN

IF source_id > 100000 THEN SET source_id = source_id - 100000; END IF;

SELECT
CLIENT.NEW_GROUP_REFERENCE_NUMBER, 
CLIENT.name,  
CONCAT(IFNULL(CLIENT.OPERATION_STREET,''), ' ',    IFNULL(CLIENT.OPERATION_CITY,''), ' ', 
IFNULL(CLIENT.OPERATION_STATE_PROVINCE, ''), ' ', IFNULL(CLIENT.OPERATION_ZIP, ''))

INTO 
NORMALIZED_ID,
NAME,
ADDRESS

FROM ccis_vendors.client_id SOURCE
INNER JOIN ccis_vendors.receivable CLIENT ON CLIENT.id = SOURCE.ACCOUNT_ID
WHERE SOURCE.number = source_id AND SOURCE.division = source_division;

END

谢谢大家！

Answer 1

你不能这样吗？

 CREATE DEFINER=`simonh`@`%` PROCEDURE `get_normalized_client_id`(IN source_id INT, IN source_division VARCHAR(255), IN source_currency VARCHAR(255), OUT NORMALIZED_ID INT, OUT NAME VARCHAR(255), OUT ADDRESS VARCHAR(255))
    BEGIN

IF source_id > 100000 THEN SET source_id = source_id - 100000; END IF;

SELECT
CLIENT.NEW_GROUP_REFERENCE_NUMBER INTO NORMALIZED_ID,
CONCAT(IFNULL(CLIENT.OPERATION_STREET,''), ' ', IFNULL(CLIENT.OPERATION_CITY,''), ' ', 
IFNULL(CLIENT.OPERATION_STATE_PROVINCE, ''), ' ', IFNULL(CLIENT.OPERATION_ZIP, '')) INTO ADDRESS,
CLIENT.name INTO NAME
FROM ccis_vendors.client_id SOURCE
INNER JOIN ccis_vendors.receivable CLIENT ON CLIENT.id = SOURCE.ACCOUNT_ID
WHERE SOURCE.number = source_id AND SOURCE.division = source_division;


END

Answer 2

您可以将选择简化为一个。而且，我建议对参数使用一致的命名约定——因此不太可能与列混淆：

DELIMITER $$
CREATE DEFINER=`simonh`@`%` PROCEDURE `get_normalized_client_id`(
    IN in_source_id INT,
    IN in_source_division VARCHAR(255),
    IN in_source_currency VARCHAR(255),
    OUT out_NORMALIZED_ID INT,
    OUT out_NAME VARCHAR(255),
    OUT out_ADDRESS VARCHAR(255)
)
BEGIN
    IF in_source_id > 100000 THEN
        SET in_source_id = in_source_id - 100000;
    END IF;

    SELECT out_NORMALIZED_ID := CLIENT.NEW_GROUP_REFERENCE_NUMBER,
           out_Name := CLIENT.NAME,
           out_Address := CONCAT_WS(' ', CLIENT.OPERATION_STREET, CLIENT.OPERATION_CITY,
                                    CLIENT.OPERATION_STATE_PROVINCE, CLIENT.OPERATION_ZIP
                                   )
    FROM ccis_vendors.client_id SOURCE INNER JOIN
         ccis_vendors.receivable CLIENT
         ON CLIENT.id = SOURCE.ACCOUNT_ID
    WHERE SOURCE.number = in_source_id AND SOURCE.division = in_source_division;

END;$$
DELIMITER ;

另外：

• 我将IF 放在多行上。更清楚的是END IF 在那里。一般来说，我会将事情的“结束”放在“开始”的下方，以确保正确结束。
• CONCAT_WS() 似乎比 CONCAT() 更好。作为奖励，它还处理 NULL 值。
• 我更喜欢:= 的内联语法而不是INTO。这真的只是风格问题。 INTO 用于其他用途，例如文件访问，所以我认为:= 更清晰。

Answer 3

Begin 和 End 语句之间 选择 CLIENT.name INTO NAME, CLIENT.NEW_GROUP_REFERENCE_NUMBER 到 NORMALIZED_ID， CONCAT(IFNULL(CLIENT.OPERATION_STREET,''), '', IFNULL(CLIENT.OPERATION_CITY,''), '', IFNULL(CLIENT.OPERATION_STATE_PROVINCE, ''), ' ', IFNULL(CLIENT.OPERATION_ZIP, '')) 进入地址 FROM ccis_vendors.client_id SOURCE 内部连接 ​​ccis_vendors.receivable CLIENT ON CLIENT.id = SOURCE.ACCOUNT_ID WHERE SOURCE.number = source_id AND SOURCE.division = source_division;