mysql - 更新临时表问题的查询 - mysql

Question

更新查询不会将值更新到 mysql 中的临时表中。

DECLARE _defaultDateTime DATETIME;
DECLARE _resourceTypeId CHAR(36);
DECLARE _billedUsageHrs DECIMAL(15,6);
DECLARE _unbilledusageHrs DECIMAL(15,6);
DECLARE _billedCost DECIMAL(15,6);
DECLARE _unBilledCost DECIMAL(15,6);
DECLARE _resourceIdentifier CHAR(36);

DROP TABLE IF EXISTS _usageTable;

CREATE TEMPORARY TABLE _usageTable(resourceinstanceId CHAR(36),billedusageinHrs DECIMAL(15,6), billedusageCost DECIMAL(15,6),                       unBilledusageinHrs DECIMAL(15,6), unbilledusageCost DECIMAL(15,6)) ENGINE=MEMORY;


UPDATE  _usageTable SET resourceinstanceId = 'a17b5e49-000c-11e3-8bfa-842b2bac06e5' WHERE 1 = 1;  

SELECT resourceinstanceId, billedusageinHrs, billedusageCost, unBilledusageinHrs, unbilledusageCost FROM _usageTable; 

上述存储过程返回空行

Answer 1

CREATE TEMPORARY TABLE _usageTable(resourceinstanceId CHAR(36),
                                   billedusageinHrs DECIMAL(15,6), 
                                   billedusageCost DECIMAL(15,6),
                                   unBilledusageinHrs DECIMAL(15,6), 
                                   unbilledusageCost DECIMAL(15,6)) ENGINE=MEMORY;


UPDATE  _usageTable SET resourceinstanceId = 'a17b5e49-000c-11e3-8bfa-842b2bac06e5' WHERE 1 = 1;  

UPDATE将更新现有行。

据我所知，您刚刚创建了表格。所以它是空的。根本没有要更新的行。

也许您正在寻找INSERT而不是UPDATE？或者，也许你的例子没有强调真正的问题？