Question

我有一个像这样的mysql存储过程：

CREATE DEFINER=`root`@`localhost` PROCEDURE `accounts_summary_by`(
    IN **created_by** int(10)
)
BEGIN
    SET group_concat_max_len=2048;
    SET @sql = NULL;
    SELECT
    GROUP_CONCAT(
    DISTINCT CONCAT(
    'MAX(IF(fiscal_year = ''',
    fiscal_year,
    ''', amount, 0)) AS ',
    CONCAT("'",fiscal_year,"'")
    )
    ) INTO @sql
    FROM
    net_savings;
    SET @sql = CONCAT('SELECT   accounts.id,
                                accounts.account, 
                                accounts.region, 
                                accounts.cluster, 
                                accounts.industry, ,'
                                ,@sql,
                                'FROM net_savings join accounts 
                                on  accounts.id = net_savings.account_id
                                Where accounts.user_id = **created_by**
                                GROUP BY accounts.account,net_savings.account_id 
                                ORDER BY accounts.id');

    PREPARE statement FROM @sql;
    EXECUTE statement;
    DEALLOCATE PREPARE statement;
    END

但是在调用这样的程序时：

CALL accounts_summary_by(2)

2是对另一个名为users的表的user_id引用。

它给了我一个错误。请帮助，因为我找不到任何修复我的问题。

0   72  23:41:12    CALL `buckets`.`accounts_summary_by`(1) Error Code: 1054. Unknown column 'created_by' in 'where clause' 0.000 sec

Answer 1

MySQL的内部编程语言不是php，它不会解析文本中的变量，所以你需要将它正确地连接到预处理语句的中间：

SET @sql = CONCAT('SELECT   accounts.id,
                            accounts.account, 
                            accounts.region, 
                            accounts.cluster, 
                            accounts.industry,'
                            ,@sql,
                            'FROM net_savings join accounts 
                            on  accounts.id = net_savings.account_id
                            Where accounts.user_id ='
                            ,created_by
                            ,'GROUP BY accounts.account,net_savings.account_id 
                            ORDER BY accounts.id');

由于created_by是过程的参数，因此您无需使用@。

预先定位它

Mysql参数不起作用

1 个答案: