mysql - 如何将参数传递给具有联合的mysql存储过程

Question

我是 MySQL 的新手，正在尝试使用 IF 语句 和 UNION ALL 在存储过程中编写一个存储过程。但我不确定在查询中的何处添加 Where Condition。

我正在尝试:

BEGIN
SELECT 'ele_certificate' AS CERTIFICATE, `ele_certificate` AS STATUS, `property_id` AS pid, `ELEcertificate_issue_date` AS OldExpiry, `ELEcertificate_expiry_date` AS NewExpiry, `ELEcertificate_duration` AS Duration, `ELEcertNotes` AS Notes, `property_code`, `property_added_date`, `property_address_1`, `property_address_2`, `property_address_3`, `property_city`, `property_cluster`, `property_area`, `property_postcode`, `property_landlord_id`, `property_status`, CONCAT(tbl_landlord.landlord_first_name,' ',tbl_landlord.landlord_middle_name,' ',tbl_landlord.landlord_last_name) AS fullName, tbl_landlord.landlord_work_number, tbl_landlord.landlord_mobile_number, tbl_landlord.landlord_main_email
FROM tbl_property LEFT OUTER JOIN tbl_landlord ON tbl_property.property_landlord_id=tbl_landlord.landlord_id
UNION ALL
SELECT 'eml_certificate', `eml_certificate`, `property_id`, `EMLcertificate_issue_date`, `EMLcertificate_expiry_date`, `EMLcertificate_duration`, `EMLcertNotes`, `property_code`, `property_added_date`, `property_address_1`, `property_address_2`, `property_address_3`, `property_city`, `property_cluster`, `property_area`, `property_postcode`, `property_landlord_id`, `property_status`, CONCAT(tbl_landlord.landlord_first_name,' ',tbl_landlord.landlord_middle_name,' ',tbl_landlord.landlord_last_name) AS fullName, tbl_landlord.landlord_work_number, tbl_landlord.landlord_mobile_number, tbl_landlord.landlord_main_email
FROM tbl_property LEFT OUTER JOIN tbl_landlord ON tbl_property.property_landlord_id=tbl_landlord.landlord_id
UNION ALL
SELECT 'epc_certificate', `epc_certificate`, `property_id`, `EPCcertificate_issue_date`, `EPCcertificate_expiry_date`, `EPCcertificate_duration`, `EPCcertNotes`, `property_code`, `property_added_date`, `property_address_1`, `property_address_2`, `property_address_3`, `property_city`, `property_cluster`, `property_area`, `property_postcode`, `property_landlord_id`, `property_status`, CONCAT(tbl_landlord.landlord_first_name,' ',tbl_landlord.landlord_middle_name,' ',tbl_landlord.landlord_last_name) AS fullName, tbl_landlord.landlord_work_number, tbl_landlord.landlord_mobile_number, tbl_landlord.landlord_main_email
FROM tbl_property LEFT OUTER JOIN tbl_landlord ON tbl_property.property_landlord_id=tbl_landlord.landlord_id
UNION ALL
SELECT 'fir_certificate', `fir_certificate`, `property_id`, `FIRcertificate_issue_date`, `FIRcertificate_expiry_date`, `FIRcertificate_duration`, `FIRcertNotes`, `property_code`, `property_added_date`, `property_address_1`, `property_address_2`, `property_address_3`, `property_city`, `property_cluster`, `property_area`, `property_postcode`, `property_landlord_id`, `property_status`, CONCAT(tbl_landlord.landlord_first_name,' ',tbl_landlord.landlord_middle_name,' ',tbl_landlord.landlord_last_name) AS fullName, tbl_landlord.landlord_work_number, tbl_landlord.landlord_mobile_number, tbl_landlord.landlord_main_email
FROM tbl_property LEFT OUTER JOIN tbl_landlord ON tbl_property.property_landlord_id=tbl_landlord.landlord_id
UNION ALL
SELECT 'gas_certificate', `gas_certificate`, `property_id`, `GAScertificate_issue_date`, `GAScertificate_expiry_date`, `GAScertificate_duration`, `GAScertNotes`, `property_code`, `property_added_date`, `property_address_1`, `property_address_2`, `property_address_3`, `property_city`, `property_cluster`, `property_area`, `property_postcode`, `property_landlord_id`, `property_status`, CONCAT(tbl_landlord.landlord_first_name,' ',tbl_landlord.landlord_middle_name,' ',tbl_landlord.landlord_last_name) AS fullName, tbl_landlord.landlord_work_number, tbl_landlord.landlord_mobile_number, tbl_landlord.landlord_main_email
FROM tbl_property LEFT OUTER JOIN tbl_landlord ON tbl_property.property_landlord_id=tbl_landlord.landlord_id
UNION ALL
SELECT 'hmo_certificate', `hmo_certificate`, `property_id`, `HMOcertificate_issue_date`, `HMOcertificate_expiry_date`, `HMOcertificate_duration`, `HMOcertNotes`, `property_code`, `property_added_date`, `property_address_1`, `property_address_2`, `property_address_3`, `property_city`, `property_cluster`, `property_area`, `property_postcode`, `property_landlord_id`, `property_status`, CONCAT(tbl_landlord.landlord_first_name,' ',tbl_landlord.landlord_middle_name,' ',tbl_landlord.landlord_last_name) AS fullName, tbl_landlord.landlord_work_number, tbl_landlord.landlord_mobile_number, tbl_landlord.landlord_main_email
FROM tbl_property LEFT OUTER JOIN tbl_landlord ON tbl_property.property_landlord_id=tbl_landlord.landlord_id
UNION ALL
SELECT 'ins_certificate', `ins_certificate`, `property_id`, `INScertificate_issue_date`, `INScertificate_expiry_date`, `INScertificate_duration`, `INScertNotes`, `property_code`, `property_added_date`, `property_address_1`, `property_address_2`, `property_address_3`, `property_city`, `property_cluster`, `property_area`, `property_postcode`, `property_landlord_id`, `property_status`, CONCAT(tbl_landlord.landlord_first_name,' ',tbl_landlord.landlord_middle_name,' ',tbl_landlord.landlord_last_name) AS fullName, tbl_landlord.landlord_work_number, tbl_landlord.landlord_mobile_number, tbl_landlord.landlord_main_email
FROM tbl_property LEFT OUTER JOIN tbl_landlord ON tbl_property.property_landlord_id=tbl_landlord.landlord_id;
END

这个过程给了我正确的结果，我在单个表上应用了 UNION ALL 以将列转换为行。

当我尝试将参数传递给过程时，我正在编写以下查询:

BEGIN
SET @Certificates = ("SELECT 'ele_certificate' AS CERTIFICATE, `ele_certificate` AS STATUS, `property_id` AS pid, `ELEcertificate_issue_date` AS OldExpiry, `ELEcertificate_expiry_date` AS NewExpiry, `ELEcertificate_duration` AS Duration, `ELEcertNotes` AS Notes, `property_code`, `property_added_date`, `property_address_1`, `property_address_2`, `property_address_3`, `property_city`, `property_cluster`, `property_area`, `property_postcode`, `property_landlord_id`, `property_status`, CONCAT(tbl_landlord.landlord_first_name,' ',tbl_landlord.landlord_middle_name,' ',tbl_landlord.landlord_last_name) AS fullName, tbl_landlord.landlord_work_number, tbl_landlord.landlord_mobile_number, tbl_landlord.landlord_main_email
FROM tbl_property LEFT OUTER JOIN tbl_landlord ON tbl_property.property_landlord_id=tbl_landlord.landlord_id
UNION ALL
SELECT 'eml_certificate', `eml_certificate`, `property_id`, `EMLcertificate_issue_date`, `EMLcertificate_expiry_date`, `EMLcertificate_duration`, `EMLcertNotes`, `property_code`, `property_added_date`, `property_address_1`, `property_address_2`, `property_address_3`, `property_city`, `property_cluster`, `property_area`, `property_postcode`, `property_landlord_id`, `property_status`, CONCAT(tbl_landlord.landlord_first_name,' ',tbl_landlord.landlord_middle_name,' ',tbl_landlord.landlord_last_name) AS fullName, tbl_landlord.landlord_work_number, tbl_landlord.landlord_mobile_number, tbl_landlord.landlord_main_email
FROM tbl_property LEFT OUTER JOIN tbl_landlord ON tbl_property.property_landlord_id=tbl_landlord.landlord_id
UNION ALL
SELECT 'epc_certificate', `epc_certificate`, `property_id`, `EPCcertificate_issue_date`, `EPCcertificate_expiry_date`, `EPCcertificate_duration`, `EPCcertNotes`, `property_code`, `property_added_date`, `property_address_1`, `property_address_2`, `property_address_3`, `property_city`, `property_cluster`, `property_area`, `property_postcode`, `property_landlord_id`, `property_status`, CONCAT(tbl_landlord.landlord_first_name,' ',tbl_landlord.landlord_middle_name,' ',tbl_landlord.landlord_last_name) AS fullName, tbl_landlord.landlord_work_number, tbl_landlord.landlord_mobile_number, tbl_landlord.landlord_main_email
FROM tbl_property LEFT OUTER JOIN tbl_landlord ON tbl_property.property_landlord_id=tbl_landlord.landlord_id
UNION ALL
SELECT 'fir_certificate', `fir_certificate`, `property_id`, `FIRcertificate_issue_date`, `FIRcertificate_expiry_date`, `FIRcertificate_duration`, `FIRcertNotes`, `property_code`, `property_added_date`, `property_address_1`, `property_address_2`, `property_address_3`, `property_city`, `property_cluster`, `property_area`, `property_postcode`, `property_landlord_id`, `property_status`, CONCAT(tbl_landlord.landlord_first_name,' ',tbl_landlord.landlord_middle_name,' ',tbl_landlord.landlord_last_name) AS fullName, tbl_landlord.landlord_work_number, tbl_landlord.landlord_mobile_number, tbl_landlord.landlord_main_email
FROM tbl_property LEFT OUTER JOIN tbl_landlord ON tbl_property.property_landlord_id=tbl_landlord.landlord_id
UNION ALL
SELECT 'gas_certificate', `gas_certificate`, `property_id`, `GAScertificate_issue_date`, `GAScertificate_expiry_date`, `GAScertificate_duration`, `GAScertNotes`, `property_code`, `property_added_date`, `property_address_1`, `property_address_2`, `property_address_3`, `property_city`, `property_cluster`, `property_area`, `property_postcode`, `property_landlord_id`, `property_status`, CONCAT(tbl_landlord.landlord_first_name,' ',tbl_landlord.landlord_middle_name,' ',tbl_landlord.landlord_last_name) AS fullName, tbl_landlord.landlord_work_number, tbl_landlord.landlord_mobile_number, tbl_landlord.landlord_main_email
FROM tbl_property LEFT OUTER JOIN tbl_landlord ON tbl_property.property_landlord_id=tbl_landlord.landlord_id
UNION ALL
SELECT 'hmo_certificate', `hmo_certificate`, `property_id`, `HMOcertificate_issue_date`, `HMOcertificate_expiry_date`, `HMOcertificate_duration`, `HMOcertNotes`, `property_code`, `property_added_date`, `property_address_1`, `property_address_2`, `property_address_3`, `property_city`, `property_cluster`, `property_area`, `property_postcode`, `property_landlord_id`, `property_status`, CONCAT(tbl_landlord.landlord_first_name,' ',tbl_landlord.landlord_middle_name,' ',tbl_landlord.landlord_last_name) AS fullName, tbl_landlord.landlord_work_number, tbl_landlord.landlord_mobile_number, tbl_landlord.landlord_main_email
FROM tbl_property LEFT OUTER JOIN tbl_landlord ON tbl_property.property_landlord_id=tbl_landlord.landlord_id
UNION ALL
SELECT 'ins_certificate', `ins_certificate`, `property_id`, `INScertificate_issue_date`, `INScertificate_expiry_date`, `INScertificate_duration`, `INScertNotes`, `property_code`, `property_added_date`, `property_address_1`, `property_address_2`, `property_address_3`, `property_city`, `property_cluster`, `property_area`, `property_postcode`, `property_landlord_id`, `property_status`, CONCAT(tbl_landlord.landlord_first_name,' ',tbl_landlord.landlord_middle_name,' ',tbl_landlord.landlord_last_name) AS fullName, tbl_landlord.landlord_work_number, tbl_landlord.landlord_mobile_number, tbl_landlord.landlord_main_email
FROM tbl_property LEFT OUTER JOIN tbl_landlord ON tbl_property.property_landlord_id=tbl_landlord.landlord_id");
IF datepickerfilter1 != 0 AND datepickerfilter2 != 0 THEN
SELECT @Certificates + WHERE 
ELEcertificate_expiry_date BEGIN datepickerfilter1 AND datepickerfilter2 OR 
EMLcertificate_expiry_date BEGIN datepickerfilter1 AND datepickerfilter2 OR 
EPCcertificate_expiry_date BEGIN datepickerfilter1 AND datepickerfilter2 OR 
FIRcertificate_expiry_date BEGIN datepickerfilter1 AND datepickerfilter2 OR 
GAScertificate_expiry_date BEGIN datepickerfilter1 AND datepickerfilter2 OR 
HMOcertificate_expiry_date BEGIN datepickerfilter1 AND datepickerfilter2 OR 
INScertificate_expiry_date BEGIN datepickerfilter1 AND datepickerfilter2;
PREPARE smtp FROM @Certificates;
EXECUTE smtp;
END IF;
IF datepickerfilter1 != 0 AND datepickerfilter2 = 0 THEN
SELECT @Certificates + WHERE 
ELEcertificate_expiry_date = datepickerfilter1 OR EMLcertificate_expiry_date = datepickerfilter1 OR EPCcertificate_expiry_date = datepickerfilter1 OR FIRcertificate_expiry_date = datepickerfilter1 OR GAScertificate_expiry_date = datepickerfilter1 OR HMOcertificate_expiry_date = datepickerfilter1 OR INScertificate_expiry_date = datepickerfilter1;
PREPARE smtp FROM @Certificates;
EXECUTE smtp;
END IF;
IF datepickerfilter1 = 0 AND datepickerfilter2 != 0 THEN
SELECT @Certificates + WHERE 
ELEcertificate_expiry_date = datepickerfilter2 OR EMLcertificate_expiry_date = datepickerfilter2 OR EPCcertificate_expiry_date = datepickerfilter2 OR FIRcertificate_expiry_date = datepickerfilter2 OR GAScertificate_expiry_date = datepickerfilter2 OR HMOcertificate_expiry_date = datepickerfilter2 OR INScertificate_expiry_date = datepickerfilter2;
PREPARE smtp FROM @Certificates;
EXECUTE smtp;
END IF;
IF datepickerfilter1 = 0 AND datepickerfilter2 != 0 THEN
SELECT @Certificates;
PREPARE smtp FROM @Certificates;
EXECUTE smtp;
END IF;
END

在这里，我尝试将我之前的结果存储在一个变量中，然后应用 IF 条件。但是我执行程序失败。

注意:

我在单个表中有 7 个不同的 expiry_date 列，通过应用 UNION ALL 我将其转换为单个列。现在我试图通过将参数传递给结果输出来过滤数据。

我用谷歌搜索了它，但没有找到合适的解决方案，欢迎任何形式的帮助，在此先感谢。

Answer 1

局部变量(以@开头)不会在运行时求值，您必须在创建准备语句之前使用常规字符串变量来存储 SQL。

像这样构建您的@certificates 变量使用concat(...):

IF datepickerfilter1 <> 0 AND datepickerfilter2 = 0 THEN

   set @Certificates = concat(@Certificates,
         " WHERE ELEcertificate_expiry_date ", 
         " BETWEEN '",datepickerfilter1,"' AND '",datepickerfilter2, "'" );
     /*I'm using one line as example, you must complete to meet your query*/

   PREPARE smtp FROM @Certificates;
   EXECUTE smtp;
   DEALLOCATE PREPARE smtp; -- important
END IF;

对其他准备好的语句执行相同的操作。