Mssql Server 到 MySql 之间的迁移视图
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【中文标题】Mssql Server 到 MySql 之间的迁移视图【英文标题】：migration view between Mssql Server to MySql 【发布时间】：2019-02-27 09:58:45 【问题描述】：我将数据库表从 mssql 迁移到 mysql。现在我想在 mssql 到 mysql 数据库之间迁移一个视图，我尝试手动执行此操作。对于 mysql，我使用工作台。 mssql数据库中的视图如下：
SELECT
u.Name,
u.Rights,
u.FirstName,
u.LastName,
u.IsDeleted,
activities.SiteName,
activities.RegionID,
activities.RegionName,
activities.ActivityID,
activities.DateTime,
activities.UserID,
activities.IPAddress,
activities.ClientID,
activities.SiteID,
activities.VariableID,
activities.ActivityActionID,
activities.Description,
activities.LogActionDescription,
activities.DeviceName,
activities.VariableName
FROM Security.[User] AS u
INNER JOIN
(SELECT a.SiteName,
a.RegionID,
a.RegionName,
a.ActivityID,
a.DateTime,
a.UserID,
a.IPAddress,
a.ClientID,
a.SiteID,
a.VariableID,
a.ActivityActionID,
a.Description,
a.LogActionDescription,
v.DeviceName,
v.VariableName
FROM dbo.v_ReportVariables AS v
RIGHT OUTER JOIN
(SELECT s.SiteName,
s.RegionID, s.RegionName, [Log].Activity.ActivityID,
[Log].Activity.DateTime, [Log].Activity.UserID, [Log].Activity.IPAddress,
[Log].Activity.ClientID, [Log].Activity.SiteID, [Log].Activity.VariableID,
[Log].Activity.ActivityActionID, [Log].Activity.Description,
[Log].ActivityAction.Description AS LogActionDescription
FROM dbo.v_Sites AS s
RIGHT OUTER JOIN
[Log].Activity ON s.SiteID = [Log].Activity.SiteID
INNER JOIN [Log].ActivityAction ON [Log].Activity.ActivityActionID = [Log].ActivityAction.ActivityActionID) AS a
ON v.VariableID = a.VariableID
) AS activities ON u.UserID = activities.UserID
当我在 mysql 中迁移数据库表时，表的名称发生了变化。 例如，当 mssql 中的名称为“Security.User”时，mysql 中的名称更改为 security_user。 我尝试手动创建从 mssql 到 mysqlsql 的上述视图，更改表的名称如下：
SELECT
u.Name,
u.Rights,
u.FirstName,
u.LastName,
u.IsDeleted,
activities.SiteName,
activities.RegionID,
activities.RegionName,
activities.ActivityID,
activities.DateTime,
activities.UserID,
activities.IPAddress,
activities.ClientID,
activities.SiteID,
activities.VariableID,
activities.ActivityActionID,
activities.Description,
activities.LogActionDescription,
activities.DeviceName,
activities.VariableName
FROM Security_User AS u
INNER JOIN
(SELECT a.SiteName,
a.RegionID,
a.RegionName,
a.ActivityID,
a.DateTime,
a.UserID,
a.IPAddress,
a.ClientID,
a.SiteID,
a.VariableID,
a.ActivityActionID,
a.Description,
a.LogActionDescription,
v.DeviceName,
v.VariableName
FROM dbo_v_ReportVariables AS v
RIGHT OUTER JOIN
(SELECT s.SiteName,
s.RegionID, s.RegionName, Log_Activity.ActivityID,
Log_Activity.DateTime, Log_Activity.UserID, Log_Activity.IPAddress,
Log_Activity.ClientID, Log_Activity.SiteID, Log_Activity.VariableID,
Log_Activity.ActivityActionID, Log_Activity.Description,
Log_ActivityAction.Description AS LogActionDescription
FROM dbo_v_Sites AS s
RIGHT OUTER JOIN
Log_Activity ON s.SiteID = Log_Activity.SiteID
INNER JOIN Log_ActivityAction ON Log_Activity.ActivityActionID = Log_ActivityAction.ActivityActionID) AS a
ON v.VariableID = a.VariableID
) AS activities ON u.UserID = activities.UserID
我在 mysql 中创建了一个没有语法错误的视图。 但是mysql中创建后的代码视图改为：
SELECT
`u`.`Name` AS `Name`,
`u`.`Rights` AS `Rights`,
`u`.`FirstName` AS `FirstName`,
`u`.`LastName` AS `LastName`,
`u`.`IsDeleted` AS `IsDeleted`,
`activities`.`SiteName` AS `SiteName`,
`activities`.`RegionID` AS `RegionID`,
`activities`.`RegionName` AS `RegionName`,
`activities`.`ActivityID` AS `ActivityID`,
`activities`.`DateTime` AS `DateTime`,
`activities`.`UserID` AS `UserID`,
`activities`.`IPAddress` AS `IPAddress`,
`activities`.`ClientID` AS `ClientID`,
`activities`.`SiteID` AS `SiteID`,
`activities`.`VariableID` AS `VariableID`,
`activities`.`ActivityActionID` AS `ActivityActionID`,
`activities`.`Description` AS `Description`,
`activities`.`LogActionDescription` AS `LogActionDescription`,
`activities`.`DeviceName` AS `DeviceName`,
`activities`.`VariableName` AS `VariableName`
FROM
(`eye`.`security_user` `u`
JOIN (SELECT
`a`.`SiteName` AS `SiteName`,
`a`.`RegionID` AS `RegionID`,
`a`.`RegionName` AS `RegionName`,
`a`.`ActivityID` AS `ActivityID`,
`a`.`DateTime` AS `DateTime`,
`a`.`UserID` AS `UserID`,
`a`.`IPAddress` AS `IPAddress`,
`a`.`ClientID` AS `ClientID`,
`a`.`SiteID` AS `SiteID`,
`a`.`VariableID` AS `VariableID`,
`a`.`ActivityActionID` AS `ActivityActionID`,
`a`.`Description` AS `Description`,
`a`.`LogActionDescription` AS `LogActionDescription`,
`v`.`DeviceName` AS `DeviceName`,
`v`.`VariableName` AS `VariableName`
FROM
(((SELECT
`s`.`SiteName` AS `SiteName`,
`s`.`RegionID` AS `RegionID`,
`s`.`RegionName` AS `RegionName`,
`eye`.`log_activity`.`ActivityID` AS `ActivityID`,
`eye`.`log_activity`.`DateTime` AS `DateTime`,
`eye`.`log_activity`.`UserID` AS `UserID`,
`eye`.`log_activity`.`IPAddress` AS `IPAddress`,
`eye`.`log_activity`.`ClientID` AS `ClientID`,
`eye`.`log_activity`.`SiteID` AS `SiteID`,
`eye`.`log_activity`.`VariableID` AS `VariableID`,
`eye`.`log_activity`.`ActivityActionID` AS `ActivityActionID`,
`eye`.`log_activity`.`Description` AS `Description`,
`eye`.`log_activityaction`.`Description` AS `LogActionDescription`
FROM
((`eye`.`log_activity`
LEFT JOIN `eye`.`dbo_v_sites` `s` ON ((`s`.`SiteID` = `eye`.`log_activity`.`SiteID`)))
JOIN `eye`.`log_activityaction` ON ((`eye`.`log_activity`.`ActivityActionID` = `eye`.`log_activityaction`.`ActivityActionID`))))) `a`
LEFT JOIN `eye`.`dbo_v_reportvariables` `v` ON ((`v`.`VariableID` = `a`.`VariableID`)))) `activities` ON ((`u`.`UserID` = `activities`.`UserID`)))
它与我创建的代码不同，我不知道它是否具有相同的结果。我可以帮我指导一下如何手动迁移视图吗？
【问题讨论】：
【参考方案1】：在 99% 的情况下，您没有理由不能只逐字复制视图，如果需要更改表名。任何语法错误都应该足够明显。
我会从那里开始，因为在您的第三个示例中发生的重构不是我想要经历的。所有引用字符都让我的眼睛流泪。并且从右到左连接的交换也需要仔细理解。
顺便说一句，我还要说，在我（比我想记住的时间更长）的职业生涯中，我从来没有写过正确的加入，因为我发现换一种方式更清楚，但这可能是只有我。即便如此，我也不希望将其留给自动重构，这会使阅读变得更加困难，而变得更容易。
所以请使用您的手动版本 - 两个数据库之间的 sql 几乎总是可以工作。我相信您可以找到详细说明可能妨碍您的差异（如数据类型、转换等）的资源。
您的视图没有这些。
【讨论】：
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