[FIXED] Execute merge query in Spring JPA

Issue

I have a couple SQL tables say

table1
___________________________ _ _ _ _ _
|id | date | col1 | col2 |col3 |col4 ...
--------------------------------------
|1  | 1/11 |      |      |     | 
____________________________ _ _ _ _ _

and

table2
_________________________
|id | date | col1 | col2 |
--------------------------
|1  | 1/11 | ice  | cone |

I want the ability to merge data from table2 into table1 based on the id and date - if the id and date match - then the data (col1 and col2) is copied over from table2 onto table1.

I have the SQL query to make this work

// merge_query1:

MERGE table1 t1
USING table2 t2
ON (t1.id = t2.id AND t1.date=t2.date )
WHEN MATCHED
    THEN UPDATE SET
                    t1.col1 = t2.col1,
                    t1.col2 = t2.col2
;

now the question is how do I execute this using Spring JPA.

I was thinking something along the lines of writing a JPA Interface like so.

// How would I design this or something like this ? 
// What pojo should be put instead of the question mark in JpaRepository<?, .. >

public interface MergeTables extends JpaRepository<?, Long> {
    @Query(value = MERGE_TABLE2_WITH_TABLE1, nativeQuery = true)
    void executeMergeTableQuery();
}

where the MERGE_TABLE2_WITH_TABLE1 String is

public static String MERGE_TABLE2_WITH_TABLE1 = "MERGE table1 t1
                                                   USING table2 t2
                                                   ON (t1.id = t2.id AND t1.date=t2.date )
                                                   WHEN MATCHED
                                                   THEN UPDATE SET
                                                         t1.col1 = t2.col1,
                                                         t1.col2 = t2.col2
                                                   ;
                                                ";

So the question is How would I design so that the merge query is executed upon calling the above function or is there another way of doing something like this?

Solution

Adding @Modified and @Transactional did the trick.

Answered By - dilbert2219
Answer Checked By - Timothy Miller (JavaFixing Admin)