Question

我在mssql和mysql之间迁移了数据库表。现在，我想将mssql之间的视图迁移到mysql数据库，然后尝试手动进行操作。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，表的名称已更改。例如，当mssql中的名称为“ Security.User”时，mysql中的名称更改为security_user。我试图手动创建从mssql到myssql的上述视图，将表名称更改如下：

 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

，我创建了一个在mysql中没有语法错误的视图。但是创建后的代码视图在mysql中更改为：

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。我可以帮我指导某些人如何手动迁移视图吗？

Answer 1

您没有理由99％的时间不能只逐字复制视图，如果需要的话可以更改表名。任何语法错误都应该足够明显。

我将从这里开始，因为在您的第三个示例中发生的重构不是我想要经历的。所有引号字符使我眼前一亮。从右连接到左连接的交换也需要仔细理解。

顺便说一句，我也要说，在我的职业生涯（比我想念的要长）中，我从来没有写过正确的联接，因为我发现相反的做法更加清楚，但这可能是只有我。即便如此，我也不想将其留给自动重构，这使得阅读起来变得更加困难，而晒黑变得更加容易。

因此，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会造成影响的差异（诸如数据类型，转换等之类的资源）的资源。

您的视图没有这些。

Mssql服务器到MySql之间的迁移视图

1 个答案: