MySQL Bugs: #82843: MySQL Workbench fails to connect because of incorrect LastDefaultSchema escaping

Bug #82843	MySQL Workbench fails to connect because of incorrect LastDefaultSchema escaping
Submitted:	2 Sep 2016 10:21	Modified:	3 Sep 2016 6:46
Reporter:	Rob Janssen	Email Updates:
Status:	Verified	Impact on me:	None
Category:	MySQL Workbench	Severity:	S3 (Non-critical)
Version:	6.0 - 6.3.7	OS:	Windows
Assigned to:		CPU Architecture:	Any

Description:
Yesterday I connected to MySQL server and everything was all fine and dandy. I created a schema and imported a backup and went along my merry way doing what I do. Last night I went home to get some sleep. This morning, after a cup of joe, I fired up MySQL Workbench (then 6.0.<something>) and tried to connect to one of the stored connections. This resulted in the following error message (http://i.imgur.com/WTfuUaw.png):

Your connection attempt failed for user '<username>' from your host to server at foo.bar.com:3306:
Type mismatch: expected type string, but got int

I lost an entire morning trying to figure out what was going on. My colleague could connect with MySQL Workbench fine (he was on 6.2.<something>). So I downloaded the latest (currently 6.3.7) and tried that. Still got the same error. I tried everything from changing the hostname to the IP of the host thinking the problem had something to do with the actual connection, resetting the passwordt etc. etc. Nothing helped; the only thing that helped was deleting the connection and creating a new one. FINALLY! I was back on my merry way and chalked it up as a fluke.

Then I came back from lunch, fired up MySQL Workbench again and lo and behold: the same frikkin' error. Digging deeper this time I finally went to the 'Advanced' tab of the connection and cleared the 'Others' text field and the problem was gone!? Taking another look at what I had just removed I noticed the "LastDefaultSchema=20160901" part... (http://i.imgur.com/CNi3bCM.png) Hmmm, that was the database I created yesterday and since then I'd been experiencing trouble. "Type mismatch: expected type string, but got int"... No, wait... That can't be! Seriously? I put quotes around the 20160901 part and, sure enough, the problem went away.

How to repeat:
1. Create a schema in MySQL with a numeric name [0-9] only
2. Connect MySQL Workbench to the server and set the schema created in step 1 as default schema
3. Close MySQL Workbench and use the same stored connection as used in step 2
4. Error is shown

Suggested fix:
Escape the LastDefaultSchema value correctly

Error

Attachment: ss1.png (image/png, text), 15.32 KiB.

Settings

Attachment: ss2.png (image/png, text), 13.07 KiB.

Step 3 should read:

3. Close MySQL Workbench >>and reopen it<< and use the same stored connection as used in step 2

But I'm pretty sure that was clear ;-)

Hello Rob Janssen,

Thank you for the report.
Observed this with WB 6.3.7 on Win7.

Thanks,
Umesh

Issue still exists in 8.0.17

Problem still present in Workbench v8.0. My LastDefaultSchema was set to 2022. While editing the connection, Test Connection worked. Open Connection from Home page did not. Delimited the 2022 with double quotes and the connection opens.