我有这个MySQL程序，它将一些循环放入2个表中，将数据准备到tblResults，然后在删除2个日期之间找到的所有行后，将所有数据（如果没有错误）插入到一个巨大的表中。
问题是程序运行完毕后，我收到此警告：
Unsafe statement written to the binary log using statement format since BINLOG_FORMAT = STATEMENT. Statements writing to a table with an auto-increment column after selecting from another table are unsafe because the order in which rows are retrieved determines what (if any) rows will be written. This order cannot be predicted and may differ on master and the slave.
因此，如果我在tblResults表中有250个不同的行，则该过程将250个相同的行插入到最终表中。 （通常在tblResults中找到第一行或最后一行，乘以tblResults中的记录数。）
SQL代码如下所示：
BEGIN
-- DECLARE bDone INT;
DECLARE CustomerId INT;
DECLARE LocationId INT;
DECLARE ContractId INT;
DECLARE DatePeriod DATE;
DECLARE SerialWeight DOUBLE;
DECLARE Serial VARCHAR(150);
DECLARE EnergyZone VARCHAR(5);
DECLARE ConsDay DATE;
DECLARE T0 DOUBLE;
DECLARE T1 DOUBLE;
DECLARE T2 DOUBLE;
DECLARE T3 DOUBLE;
DECLARE T4 DOUBLE;
DECLARE T5 DOUBLE;
DECLARE T6 DOUBLE;
DECLARE T7 DOUBLE;
DECLARE T8 DOUBLE;
DECLARE T9 DOUBLE;
DECLARE T10 DOUBLE;
DECLARE T11 DOUBLE;
DECLARE T12 DOUBLE;
DECLARE T13 DOUBLE;
DECLARE T14 DOUBLE;
DECLARE T15 DOUBLE;
DECLARE T16 DOUBLE;
DECLARE T17 DOUBLE;
DECLARE T18 DOUBLE;
DECLARE T19 DOUBLE;
DECLARE T20 DOUBLE;
DECLARE T21 DOUBLE;
DECLARE T22 DOUBLE;
DECLARE T23 DOUBLE;
DECLARE QtyEstimated DECIMAL(20,4);
DECLARE QtyMeasured DECIMAL(20,4);
DECLARE POD VARCHAR(50);
DECLARE Quantity DECIMAL(20,4);
DECLARE LocationCode VARCHAR(50);
DECLARE rCustomerId INT;
DECLARE rLocationId INT;
DECLARE rContractId INT;
DECLARE rDate DATE;
DECLARE rTime INT;
DECLARE rQtyEstimated DECIMAL(20,4);
DECLARE rQtyPredicted DECIMAL(20,4);
DECLARE rQtyMeasured DOUBLE;
DECLARE rCreateUser INT;
DECLARE rUpdateUser INT;
DECLARE rFirmaId INT;
DECLARE curs CURSOR FOR
select
ec.CustomerId,
ec.LocationId,
ec.Id as ContractId,
els.Date as DatePeriod,
els.SerialWeight,
ets.Serial,
ets.EnergyZone,
ets.Date as ConsDay,
ets.T0,
ets.T1,
ets.T2,
ets.T3,
ets.T4,
ets.T5,
ets.T6,
ets.T7,
ets.T8,
ets.T9,
ets.T10,
ets.T11,
ets.T12,
ets.T13,
ets.T14,
ets.T15,
ets.T16,
ets.T17,
ets.T18,
ets.T19,
ets.T20,
ets.T21,
ets.T22,
ets.T23,
CASE substr(els.Date, 6, 2)
WHEN '01' THEN ec.Estimated1
WHEN '02' THEN ec.Estimated2
WHEN '03' THEN ec.Estimated3
WHEN '04' THEN ec.Estimated4
WHEN '05' THEN ec.Estimated5
WHEN '06' THEN ec.Estimated6
WHEN '07' THEN ec.Estimated7
WHEN '08' THEN ec.Estimated8
WHEN '09' THEN ec.Estimated9
WHEN '10' THEN ec.Estimated10
WHEN '11' THEN ec.Estimated11
WHEN '12' THEN ec.Estimated12
END as QtyEstimated
from EnergyLocationSeries els
left join EnergyTimeSeries ets ON ets.Serial = els.Serial and concat(substr(ets.Date, 1, 7), '-01') = els.Date
left join EnergyLocation el ON el.Code2 = els.LocationCode
left join EnergyContract ec ON (el.Id = ec.LocationId AND el.Codep = '') OR (ec.LocationId = (SELECT max(Id) FROM EnergyLocation WHERE Code2 = el.Codep) AND Codep !='') -- AND ec.`Status` != 'Reziliat'
where els.Date = MTH and els.EnergyZone = ZONE
order by ets.Date ASC LIMIT 10;
DECLARE pods_cursor CURSOR FOR
SELECT els.LocationCode, els.Quantity
FROM EnergyLocation el
RIGHT JOIN EnergyLocationSeries els ON els.LocationCode = el.Code2 OR els.LocationCode = el.Codep
LEFT JOIN EnergyContract ec on ec.LocationId = el.Id
WHERE el.Code2 IS NULL;
DECLARE result CURSOR FOR
SELECT `CustomerId`, `LocationId`, `ContractId`, `Date`, `Time`, `QtyEstimated`, `QtyPredicted`, `QtyMeasured`, `CreateUser`, `UpdateUser`, `FirmaId`
FROM tblResults ORDER BY CustomerId, ContractId ASC;
DROP TABLE IF EXISTS tblResultsErrors;
CREATE TABLE IF NOT EXISTS tblResultsErrors (
`POD` INT(11) NULL DEFAULT NULL,
`QtyMeasured` DECIMAL(20,4) NULL DEFAULT NULL
);
DROP TABLE IF EXISTS tblResults;
CREATE TABLE IF NOT EXISTS tblResults (
`CustomerId` INT(11) NULL DEFAULT NULL,
`LocationId` INT(11) NULL DEFAULT NULL,
`ContractId` INT(11) NULL DEFAULT NULL,
`Date` DATE NULL DEFAULT NULL,
`Time` SMALLINT(6) NULL DEFAULT NULL,
`QtyEstimated` DECIMAL(20,4) NULL DEFAULT NULL,
`QtyPredicted` DECIMAL(20,4) NULL DEFAULT NULL,
`QtyMeasured` DOUBLE NULL DEFAULT NULL,
`CreateUser` VARCHAR(32) NULL DEFAULT NULL,
`UpdateUser` VARCHAR(32) NULL DEFAULT NULL,
`FirmaId` INT(11) NULL DEFAULT NULL
);
OPEN curs;
BEGIN
DECLARE bDone INT;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET bDone = 1;
SET bDone = 0;
REPEAT
FETCH curs INTO
CustomerId,
LocationId,
ContractId,
DatePeriod,
SerialWeight,
Serial,
EnergyZone,
ConsDay,
T0,
T1,
T2,
T3,
T4,
T5,
T6,
T7,
T8,
T9,
T10,
T11,
T12,
T13,
T14,
T15,
T16,
T17,
T18,
T19,
T20,
T21,
T22,
T23,
QtyEstimated;
IF bDone = 0 THEN
INSERT INTO tblResults VALUES
(CustomerId,LocationId,ContractId,ConsDay,1,QtyEstimated,0,(T0 * (SerialWeight / 100)),'root','root',0),
(CustomerId,LocationId,ContractId,ConsDay,2,QtyEstimated,0,(T1 * (SerialWeight / 100)),'root','root',0),
(CustomerId,LocationId,ContractId,ConsDay,3,QtyEstimated,0,(T2 * (SerialWeight / 100)),'root','root',0),
(CustomerId,LocationId,ContractId,ConsDay,4,QtyEstimated,0,(T3 * (SerialWeight / 100)),'root','root',0),
(CustomerId,LocationId,ContractId,ConsDay,5,QtyEstimated,0,(T4 * (SerialWeight / 100)),'root','root',0),
(CustomerId,LocationId,ContractId,ConsDay,6,QtyEstimated,0,(T5 * (SerialWeight / 100)),'root','root',0),
(CustomerId,LocationId,ContractId,ConsDay,7,QtyEstimated,0,(T6 * (SerialWeight / 100)),'root','root',0),
(CustomerId,LocationId,ContractId,ConsDay,8,QtyEstimated,0,(T7 * (SerialWeight / 100)),'root','root',0),
(CustomerId,LocationId,ContractId,ConsDay,9,QtyEstimated,0,(T8 * (SerialWeight / 100)),'root','root',0),
(CustomerId,LocationId,ContractId,ConsDay,10,QtyEstimated,0,(T9 * (SerialWeight / 100)),'root','root',0),
(CustomerId,LocationId,ContractId,ConsDay,11,QtyEstimated,0,(T10 * (SerialWeight / 100)),'root','root',0),
(CustomerId,LocationId,ContractId,ConsDay,12,QtyEstimated,0,(T11 * (SerialWeight / 100)),'root','root',0),
(CustomerId,LocationId,ContractId,ConsDay,13,QtyEstimated,0,(T12 * (SerialWeight / 100)),'root','root',0),
(CustomerId,LocationId,ContractId,ConsDay,14,QtyEstimated,0,(T13 * (SerialWeight / 100)),'root','root',0),
(CustomerId,LocationId,ContractId,ConsDay,15,QtyEstimated,0,(T14 * (SerialWeight / 100)),'root','root',0),
(CustomerId,LocationId,ContractId,ConsDay,16,QtyEstimated,0,(T15 * (SerialWeight / 100)),'root','root',0),
(CustomerId,LocationId,ContractId,ConsDay,17,QtyEstimated,0,(T16 * (SerialWeight / 100)),'root','root',0),
(CustomerId,LocationId,ContractId,ConsDay,18,QtyEstimated,0,(T17 * (SerialWeight / 100)),'root','root',0),
(CustomerId,LocationId,ContractId,ConsDay,19,QtyEstimated,0,(T18 * (SerialWeight / 100)),'root','root',0),
(CustomerId,LocationId,ContractId,ConsDay,20,QtyEstimated,0,(T19 * (SerialWeight / 100)),'root','root',0),
(CustomerId,LocationId,ContractId,ConsDay,21,QtyEstimated,0,(T20 * (SerialWeight / 100)),'root','root',0),
(CustomerId,LocationId,ContractId,ConsDay,22,QtyEstimated,0,(T21 * (SerialWeight / 100)),'root','root',0),
(CustomerId,LocationId,ContractId,ConsDay,23,QtyEstimated,0,(T22 * (SerialWeight / 100)),'root','root',0),
(CustomerId,LocationId,ContractId,ConsDay,24,QtyEstimated,0,(T23 * (SerialWeight / 100)),'root','root',0);
END IF;
UNTIL bDone END REPEAT;
END;
CLOSE curs;
OPEN pods_cursor;
BEGIN
DECLARE bDone INT;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET bDone = 1;
SET bDone = 0;
REPEAT
FETCH pods_cursor INTO POD, QtyMeasured;
IF bDone = 0 THEN
INSERT INTO tblResultsErrors VALUES
(LocationCode, Quantity);
END IF;
UNTIL bDone END REPEAT;
END;
CLOSE pods_cursor;
IF NOT EXISTS ( SELECT * FROM tblResultsErrors ) THEN
BEGIN
DELETE FROM EnergyIbdRecord WHERE Date BETWEEN MTH AND LAST_DAY(MTH);
OPEN result;
BEGIN
DECLARE bDone INT;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET bDone = 1;
SET bDone = 0;
REPEAT
FETCH result INTO rCustomerId,rLocationId,rContractId,rDate,rTime,rQtyEstimated,rQtyPredicted,rQtyMeasured,rCreateUser,rUpdateUser,rFirmaId;
IF bDone = 0 THEN
INSERT INTO EnergyIbdRecord (`CustomerId`, `LocationId`, `ContractId`, `Date`, `Time`, `QtyEstimated`, `QtyPredicted`, `QtyMeasured`, `CreateUser`, `UpdateUser`, `FirmaId`)
VALUES (rCustomerId,rLocationId,rContractId,rDate,rTime,rQtyEstimated,rQtyPredicted,rQtyMeasured,rCreateUser,rUpdateUser,rFirmaId);
END IF;
UNTIL bDone END REPEAT;
END;
CLOSE result;
END;
ELSE
BEGIN
SELECT * FROM tblResultsErrors;
END;
END IF;
END
有什么建议可以摆脱插入tblResults包含的内容吗？
也许有必要运行2个独立的程序？这是一种方法吗？
答案 0 :(得分：0)
尽可能避免使用CURSORs。 SQL旨在批量处理，而不是一次处理一行。
研究像
这样的结构INSERT INTO ... SELECT ...;
CREATE TABLE ... SELECT ...;
例如，pods_cursor可能会通过以下方式消除：
INSERT INTO tblResultsErrors
(POD, QtyMeasured)
SELECT els.LocationCode, els.Quantity
FROM EnergyLocation el
RIGHT JOIN EnergyLocationSeries els
ON els.LocationCode = el.Code2 OR els.LocationCode = el.Codep
LEFT JOIN EnergyContract ec
on ec.LocationId = el.Id
WHERE el.Code2 IS NULL;
（哎哟。混合右手和左手使我的头像猫头鹰一样旋转。）
在OR中使用ON听起来非常低效。意图是什么？