使用prepared语句进行复杂mysql查询时出现问题
以下过程不执行。int_id是用户定义的输入 我的目标是使用STR_TABLE_NAME作为表的动态变量。 注意:但是,如果我用目标表的名称替换它并删除SET@prep_stmt=,查询就会工作 为了在准备好的语句中包含变量,我使用了字符串连接。您的查询将出现错误,因为STR_TABLE_NAME将被视为表名,并且找不到任何表名。 从输入参数中删除“backtick”。使用prepared语句进行复杂mysql查询时出现问题,mysql,variables,dynamic,Mysql,Variables,Dynamic,以下过程不执行。int_id是用户定义的输入 我的目标是使用STR_TABLE_NAME作为表的动态变量。 注意:但是,如果我用目标表的名称替换它并删除SET@prep_stmt=,查询就会工作 为了在准备好的语句中包含变量,我使用了字符串连接。您的查询将出现错误,因为STR_TABLE_NAME将被视为表名,并且找不到任何表名。 从输入参数中删除“backtick”。 我明白了:MySQL说:1054-where子句中的未知列'int_id'。NIDA:“IDTABLE”必须重命名为“ItID
我明白了:MySQL说:1054-where子句中的未知列'int_id'。NIDA:“IDTABLE”必须重命名为“ItIDID”相同参数,在声明语句后的SELECT语句中从变量ItILID中删除Butik,否则MySQL会将其视为列。我在回答中也提到了同样的问题。使用答案中提到的完整代码,我对此做了许多小的更正。请确保您有一个名为int_id的过程输入参数,请考虑int_id而不是[…]中的idtable更新您的答案,其中id_region=int_id
BEGIN
DECLARE STR_TABLE_NAME VARCHAR(100) DEFAULT NULL;
SELECT `table_source` INTO STR_TABLE_NAME FROM `list_repository` WHERE
id=`int_id` LIMIT 1;
DROP TABLE IF EXISTS `loyaltytry`;
SET @prep_stmt = CREATE TABLE `loyaltytry` as (SELECT Months as month,
Number_of_New_Customers as `new_customers` , `Number_of_Repeat_Customers`
as `repeat_customers`
from
(SELECT monthname(Months) as Months, month(Months) as `Month_number`,
sum(CASE WHEN REP_COUNT ='no' then cnts end) as `Number_of_New_Customers`,
sum(CASE WHEN REP_COUNT = 'yes' then cnts end) as
`Number_of_Repeat_Customers`
from (
SELECT months,REP_COUNT,count(*) as cnts
from (
SELECT (date_commande_client) as Months , numero,
CASE WHEN cnt > 1 THEN 'yes'
ELSE 'no'
END AS REP_COUNT
from (
SELECT COUNT(*) as cnt, date_commande_client, numero
FROM STR_TABLE_NAME
WHERE YEAR(date_commande_client)=2017
AND intitule IN (SELECT showroom_name FROM `showrooms` WHERE
id_region=`int_id`)
group by date_commande_client , numero) as tmp) as final
GROUP BY Months,REP_COUNT ) as tmp1
GROUP BY monthname(Months),month(Months)
ORDER BY Month_number) as finalll
);
PREPARE stmt FROM @prep_stmt;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
END
BEGIN
DECLARE STR_TABLE_NAME VARCHAR(100) DEFAULT NULL;
SELECT table_source INTO STR_TABLE_NAME FROM list_repository WHERE id = int_id LIMIT 1;
DROP TABLE IF EXISTS `loyaltytry`;
SET @prep_stmt = CONCAT('CREATE TABLE `loyaltytry` AS (
SELECT
Months AS MONTH,
Number_of_New_Customers AS `new_customers`,
`Number_of_Repeat_Customers` AS `repeat_customers`
FROM (
SELECT
MONTHNAME(Months) AS Months,
MONTH(Months) AS `Month_number`,
SUM(CASE WHEN REP_COUNT = "no" THEN cnts END) AS `Number_of_New_Customers`,
SUM(CASE WHEN REP_COUNT = "yes" THEN cnts END) AS `Number_of_Repeat_Customers`
FROM (
SELECT
months,
REP_COUNT,
COUNT(*) AS cnts
FROM (
SELECT
(date_commande_client) AS Months,
numero,
CASE WHEN cnt > 1 THEN "yes" ELSE "no" END AS REP_COUNT
FROM (
SELECT
COUNT(*) AS cnt,
date_commande_client,
numero
FROM ', STR_TABLE_NAME ,
' WHERE YEAR(date_commande_client) = 2017
AND intitule IN (
SELECT
showroom_name
FROM `showrooms`
WHERE id_region= ', int_id , '
)
GROUP BY date_commande_client, numero
) AS tmp
) AS final
GROUP BY Months, REP_COUNT
) AS tmp1
GROUP BY MONTHNAME(Months), MONTH(Months)
ORDER BY Month_number) AS finalll
)');
PREPARE stmt FROM @prep_stmt;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
END