executeQuery()
returns a ResultSet
. I'm not as familiar with Java/MySQL, but to create indexes you probably want a executeUpdate()
.
If you're using spring boot, just add an @Modifying annotation.
@Modifying
@Query
(value = "UPDATE user SET middleName = 'Mudd' WHERE id = 1", nativeQuery = true)
void updateMiddleName();
Besides executeUpdate() on the parentheses, you must also add a variable to use an SQL statement.
For example:
PreparedStatement pst = connection.prepareStatement(sql);
int numRowsChanged = pst.executeUpdate(sql);
Use executeUpdate()
to issue data manipulation statements. executeQuery()
is only meant for SELECT queries (i.e. queries that return a result set).
That's what executeUpdate
is for.
Here's a very brief summary of the difference: http://www.coderanch.com/t/301594/JDBC/java/Difference-between-execute-executeQuery-executeUpdate
This code works for me: I set values whit an INSERT and get the LAST_INSERT_ID() of this value whit a SELECT; I use java NetBeans 8.1, MySql and java.JDBC.driver
try {
String Query = "INSERT INTO `stock`(`stock`, `min_stock`,
`id_stock`) VALUES ("
+ "\"" + p.get_Stock().getStock() + "\", "
+ "\"" + p.get_Stock().getStockMinimo() + "\","
+ "" + "null" + ")";
Statement st = miConexion.createStatement();
st.executeUpdate(Query);
java.sql.ResultSet rs;
rs = st.executeQuery("Select LAST_INSERT_ID() from stock limit 1");
rs.next(); //para posicionar el puntero en la primer fila
ultimo_id = rs.getInt("LAST_INSERT_ID()");
} catch (SqlException ex) { ex.printTrace;}
For Delete query - Use @Modifying
and @Transactional
before the @Query
like:-
@Repository
public interface CopyRepository extends JpaRepository<Copy, Integer> {
@Modifying
@Transactional
@Query(value = "DELETE FROM tbl_copy where trade_id = ?1 ; ", nativeQuery = true)
void deleteCopyByTradeId(Integer id);
}
It won't give the java.sql.SQLException: Can not issue data manipulation statements with executeQuery()
error.
Edit:
Since this answer is getting many upvotes, I shall refer you to the documentation as well for more understanding.
By default, CRUD methods on repository instances are transactional. For read operations,
the transaction configuration readOnly flag is set to true.
All others are configured with a plain @Transactional so that default transaction
configuration applies.
Indicates a query method should be considered as modifying query as that changes the way
it needs to be executed. This annotation is only considered if used on query methods defined
through a Query annotation). It's not applied on custom implementation methods or queries
derived from the method name as they already have control over the underlying data access
APIs or specify if they are modifying by their name.
Queries that require a @Modifying annotation include INSERT, UPDATE, DELETE, and DDL
statements.
@Modifying
@Transactional
@Query(value = "delete from cart_item where cart_cart_id=:cart", nativeQuery = true)
public void deleteByCart(@Param("cart") int cart);
Do not forget to add @Modifying and @Transnational before @query. it works for me.
To delete the record with some condition using native query with JPA the above mentioned annotations are important.
Source: Stackoverflow.com