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Mysql insert  or update depending on if record exists

Posted on 2014-12-01
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Last Modified: 2014-12-01
I need to update a Table Temp_MyTools

using this criteria
Create Table TempMyUpdate(Select MAX(UploadDate) as UploadDate,SerialNumber, FROM Inventory_SerializedAssets Where LocationID in(1));
update Temp_MyTools mt
Join Temp_MyUpdate as mu on mu.serialnumber = mt.serialnumber
   set mt.FUploadTime = mu.UploadDate


if there is nothing to update then Insert

/////insert
INSERT INTO Temp_MyTools(Select ToolType,SerialNumber,MAX(UploadDate) as FUploadTime, Cast('2012:01:01 12:00:00 AM'as DateTime) AS 'HUploadTime',  LocationID as DefaultLocationIndex, 1 as Qty FROM Inventory_SerializedAssets Where LocationID in(1) GROUP BY SerialNumber);

the tricky part is that this is part of a large query so it is not just by itself how would I do this?
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Question by:r3nder
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Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 500 total points
ID: 40473844
you want to use the insert with on duplicate key update syntax:
http://dev.mysql.com/doc/refman/5.7/en/insert-on-duplicate.html
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Author Comment

by:r3nder
ID: 40473851
would this work?
Create Table Temp_Update(Select MAX(UploadDate) as UploadDate,SerialNumber, FROM Inventory_SerializedAssets Where LocationID in(" + locationIndex + ")); 

             IF(Select * From Temp_MyTools Where SerialNumber in(Select SerialNumber from Temp_Update )IS NULL THEN  
                         INSERT INTO Temp_MyTools(Select ToolType,SerialNumber,MAX(UploadDate) as FUploadTime, Cast('2012:01:01 12:00:00 AM'as DateTime) AS 'HUploadTime',  LocationID as DefaultLocationIndex, 1 as Qty FROM Inventory_SerializedAssets Where LocationID in('" + locationIndex + "') GROUP BY SerialNumber);  
             ELSE UPDATE Temp_MyTools mt 
             Join Temp_MyUpdate as mu on mu.serialnumber = mt.serialnumber 
             set mt.FUploadTime = mu.UploadDate 

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Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 40473858
it will likely not work, as you will have some value on serialnumber that already are in the table, and others are not.
either then you run this per single serial number, or use the syntax I proposed
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Author Comment

by:r3nder
ID: 40473880
like this
INSERT INTO Temp_MyTools(Select ToolType,SerialNumber,MAX(UploadDate) as FUploadTime, Cast('2012:01:01 12:00:00 AM'as DateTime) AS 'HUploadTime',  LocationID as DefaultLocationIndex, 1 as Qty FROM Inventory_SerializedAssets Where LocationID in('" + locationIndex + "') GROUP BY SerialNumber)  ON DUPLICATE KEY UPDATE FUploadTime = VALUES(FUploadTime);

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LVL 142

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 40473914
that looks good :)
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Author Closing Comment

by:r3nder
ID: 40474089
Worked like a champ ! Thanks Guy
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Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

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