Question

I have a table say

MyTable (myId,myStringCol1,myStringCol2,myStringCol3)

When Using

QUERY1

hibernateTemplate.find("SELECT new(myId,myStringCol1) from MyTable")

I am getting the MyTable Object and for this there should be one constructor in the MyTable class like this

MyTable{
      MyTable(Integer id,String col1){
          this.id = id;
          this.col1 = col1;
       }

}

But when in another method I am calling like this

QUERY2

hibernateTemplate.find("SELECT new(myId,myStringCol2) from MyTable")  ///myStringCol2

Here, there also be one constructor, like above, but we can’t create the same signature constructor.
So when running the second query (QUERY2) I am getting the myStringCol2 values in col1
because of the first constructor.

So how can I solve this problem..

Waiting for the suggestions.

Answer 1

How about this:

class MyTable1{
      MyTable1(Integer id,String col1, String col2){
          this.id = id;
          this.col1 = col1;
          this.col2 = col2;
       }

}

And then:

Q1

hibernateTemplate.find("SELECT new(myId,myStringCol1,'') from MyTable")

Q2

hibernateTemplate.find("SELECT new(myId,'',myStringCol2) from MyTable") 

Would be nice if you could pass null instead of ”, but AFAIK you can not, because there is a bug that prevents you from doing that: https://forum.hibernate.org/viewtopic.php?f=1&t=985612&start=0. So, you will have to use ”

Another option, inspired by Talha answer would be:

class MyTable{
      MyTable(Integer id,String col1, Boolean isColumn2){
          this.id = id;
          if(isColumn2){
             this.col2 = col2;
          }
          else{
             this.col1 = col1;
          }
      }      
}

Then you can just write:

Q1

hibernateTemplate.find("SELECT new(myId,myStringCol1,false) from MyTable")

Q2

hibernateTemplate.find("SELECT new(myId,myStringCol2,true) from MyTable")