Select a part of a string in MySQL - mysql

Question

I have a MySQL table with a string column as,
ID String
----- -----------------------------------------
1 {"Type":"new", "Node":"{Status=New, Properties=[{PropertyValue=Samp, PropertyRefernceTypeID=1, PropertyTypeID=26}, {PropertyValue=25, PropertyRefernceTypeID=1, PropertyTypeID=33}]}"}
2 {Type":"new", "Node":"{Status=New, Properties=[{PropertyValue=25, PropertyRefernceTypeID=1, PropertyTypeID=33}, {PropertyValue=168-3, PropertyRefernceTypeID=1, PropertyTypeID=103}]}"}
Now how can I select only the PropertyValue of PropertyTypeID=33 in MySQL select Query? It is possible by using substring() method only if the length of all the strings are equal but in my case the length may vary for different ids.

Answer 1

This is why it is considered bad practice to store JSON, serialized arrays/objects, or just multiple values in a database field, unless for some reason you would never need anything inside it.
The field should always be atomic. You should follow database normalization guidelines.
Therefore your database should be something like:
ID | PropertyValue | PropertyReferenceTypeID | ProductTypeID
Then you would never have this problem, you would just do SELECT PropertyValue FROM Properties WHERE ID=1
But for now, to avoid this trouble, if you are using an app language, just get the string and decode it. For example, in PHP:
$array = json_decode($str);
$PropertyValue = $arr['Node']['Properties']['PropertyValue'];
P.S. Your json still isn't completely valid with it's nesting.