Springboot Java Developer with Focus on JDBC and Regular Expression

Have a springboot application which is already able to make calls to database and query information. Need someone to assist with some additional tasks including but not limited to:

1. calling to DB and properly returning results when queries return several rows and/or columns using parameter(s)
(EXAMPLE: Select Attr_Name, Attr_Value from attr_table where party_id = ‘SUN’)
2. once the results are returned, need to validate some of the key value pairs
3. also need to save some of the results to variables that can later be reassigned
(example: if the database returns Y for an attribute, then the value of a variable is 1, otherwise it returns 2)
4. database value may return one json string which needs to be parsed and turned into a key value list and later results need to be validated

Willing to do a quick demo to give more details but should make sense to someone who has experience.