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How can I directly view blobs in MySQL Workbench

Posted by: admin November 1, 2017 Leave a comment

Questions:

I’m using MySQL Workbench CE 5.2.30 CE / Rev 6790 . When execute the following statement:

SELECT OLD_PASSWORD("test")

I only get back a nice BLOB icon, I need to left-click to select the cell, right-click and choose “Open Value in viewer” and select the “Text” tab.

Using the same with phpMyAdmin, I get directly back the value of the OLD_PASSWORD call. It’s just an example, but is there a way to directly see such results in the output?

Answers:

In short:

  1. Go to Edit > Preferences
  2. Choose SQL Editor
  3. Under SQL Execution, check Treat BINARY/VARBINARY as nonbinary character string
  4. Restart MySQL Workbench (you will not be prompted or informed of this requirement).

With this setting you will be able to concatenate fields without getting blobs.

I think this applies to versions 5.2.22 and later and is the result of this MySQL bug.

Disclaimer: I don’t know what the downside of this setting is – maybe when you are selecting BINARY/VARBINARY values you will see it as plain text which may be misleading and/or maybe it will hinder performance if they are large enough?

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Perform three steps:

  1. Go to “WorkBench Preferences” –> Choose “SQL Editor” Under “Query Results”: check “Treat BINARY/VARBINARY as nonbinary character string”

  2. Restart MySQL WorkBench.

  3. Now select SELECT SUBSTRING(BLOB<COLUMN_NAME>,1,2500) FROM <Table_name>;

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I’m not sure if this answers the question but if if you right click on the “blob” icon in the field (when viewing the table) there is an option to “Open Value in Editor”. One of the tabs lets you view the blob. This is in ver. 5.2.34

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casting works, but it is a pain, so I would recommend using spioter’s method unless you are using a lot of truly blob data.

SELECT CAST(OLD_PASSWORD("test") AS CHAR)

You can also cast as other types, and even restrict the size, but most of the time I just use CHAR:
http://dev.mysql.com/doc/refman/5.5/en/cast-functions.html#function_cast

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Doesn’t seem to be possible I’m afraid, its listed as a bug in workbench:
http://bugs.mysql.com/bug.php?id=50692
It would be very useful though!

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had the same problem, according to the MySQL documentation, you can select a Substring of a BLOB:

SELECT id, SUBSTRING(comment,1,2000) FROM t

HTH, glissi

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Work bench 6.3
Follow High scoring answer then use UNCOMPRESS()

(In short:
1. Go to Edit > Preferences
2. Choose SQL Editor
3. Under SQL Execution, check Treat BINARY/VARBINARY as nonbinary character string
4. Restart MySQL Workbench (you will not be prompted or informed of this requirement).)

Then

SELECT SUBSTRING(UNCOMPRESS(<COLUMN_NAME>),1,2500) FROM <Table_name>;

or

SELECT CAST(UNCOMPRESS(<COLUMN_NAME>) AS CHAR) FROM <Table_name>;

If you just put UNCOMPRESS(<COLUMN_NAME>) you can right click blob and click “Open Value in Editor”.

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there is few things that you can do

SELECT GROUP_CONCAT(CAST(name AS CHAR))
FROM product
WHERE  id   IN (12345,12346,12347)

If you want to order by the query you can order by cast as well like below

SELECT GROUP_CONCAT(name ORDER BY name))
FROM product
WHERE id   IN (12345,12346,12347)

as it says on this blog

http://www.kdecom.com/mysql-group-concat-blob-bug-solved/

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SELECT *, CONVERT( UNCOMPRESS(column) USING “utf8” ) AS column FROM table_name