Discover how a ResultSetExtractor works? RowMapper Vs ResultSetExtractor || Spring JDBC | #4

[@smishra9691]

Grt simply legend of java like natraz sir🙏🙏

[@lunatichigh2896]

Thank you Abhilash!

[@nilamphajge6300]

Thanks Abhilash

[@RohitKumar-nb8qe]

Crystal clear concept..

[@AjayGupta-ob8oe]

Very very thanks abhilash.

[@christiangyaban9666]

Great piece 👏

[@Divya-xs5qb]

Thank you sir.your videos are crystal clear...

[@rajannam8279]

Hi Abhilash, Thank you for you explanation , Does we hit the DB for each row if we use the rowmapper ?

[@ramyewale2290]

Hi Abhilash.. thank you so much for this video, it helps me a lot to understand the concept in depth. I would like to suggest you one thing, is it possible to make the video bit shorter. Sometime it is being bit longer. Just suggestion. Thank you again for the valuable sessions.

[@abinashbapun9625]

As you described in the tutorial that in case of row mapper for every row it will go to the db and fetch that record, is that a round trip to db for every record , if yes would that be a performance impact as the number of round trips are more when the number of records are high? Thanks in advance.

[@Saravanan-lj9so]

Thanks.Excellent.

[@yoshitamahajan353]

Please make hibernate series also...

[@mohdharish9834]

I am so happy

[@praveengarg2427]

Sir can you make a video , what if we dont want student class as such

[@MrCupcakes85]

Will this series also complete the Love Calculator app that we started on in Spring MVC Intermediate?

[@SeleniumExpress]

Yes, Willy, That's coming up after we complete the basics !! video no 9 will be focused on spring MVC and spring JDBC integration.

[@lakshmidurgamamidipaka9078]

RowMapper will also be called only once when you pass the aruguments in the jdbcTemplate.query method as like below jdbcTemplate.query(sql,new StudentRowMapper(),rollno): The above I had tested in my practise it worked fine and mapRow() method was called only once. Then what is the difference between resultsetExtractor and RowMapper in the above case

[@badrinarayanpanda921]

Because jdbcTemplate.query(SQL,new StudentRowMapper,roll no); Method returns only one student object based on given roll number.. so that mapRow method called only once

[@omit_krish]

I have one doubt entity class properties and database properties doesn't match even how did you get data base values by using of row maller as well resultset exetractor...? 😊

[@debiprasaddash654]

In RowMapper and ResultSetExtractor we are overriding method mapRow and extractData method where we are getting resulset and that result set contain row(s) and we are extracting data feom reaultset based on db column name or position and set to our student class object so in this case no need of matching our class property name and db column name.

[@omit_krish]

@@debiprasaddash654 how did you get data from results without match those results set and database

[@omit_krish]

@@debiprasaddash654 how did you get data from results set without matching those results properties and database properties

[@rajannam8279]

@@omit_krish If you are using BeanPropertyRowMapper given by springframework , your table column names and entity variable names should be matched or else you will not get the data mapped to your object. In the case of rowmapper or resultsetextractor , we are not writing our custom Rowmapper class and ResultSetExtractor class to set the values to the object from the result set. I hope you got the answer.