I am trying to make a simple insert into a DB with HQlL by using native SQL code.
It doesn't give any error, it just doesn't work. Any help is appreciated.
Thanks.
public void AddMedicament(Medicament medicament) {
System.out.println(medicament.getName());
// open a database connection
Session session = FarmacieHibernateUtil.getSessionFactory().openSession();
Transaction transaction = session.beginTransaction();
// prepare SQL insert command
session.createSQLQuery("insert into Medicament(name) values('test')");
// close the database connection
session.close();
}
You need to call
session.executeUpdate()
transaction.commit();
before closing session.
I am not familar with Hibernate, but i dont see you sre running your command. You just create query and close session
I think you need some statement to execute it.
If you use createSQLQuery this throw a native sql instruction
Your object table name is Medicament too?
session.saveOrUpdate(medicament);
tx.commit();
then it will insert if u r not setting the Primarykey, if u r setting the PK in the domain object then it will be updated.
no need to executeQuery in hibernate if you are using the Spring ORM.
Related
I am using the below set of code for an update:
private void updateAvatarPath(Integer param1, String param2, String param3, boolean param4){
Transaction avatarUpdatePathTransaction = session.beginTransaction();
String updateQuery = "query goes here with param";
Query query = session.createSQLQuery(updateQuery);
query.executeUpdate();
avatarUpdatePathTransaction.commit();
session.flush();
}
This function is being called from a loop. So this takes time to update since for each loop it's hitting the DB. Instead of hitting DB every time, to increase the performance I am planning to execute it as batches. But have no idea how to do it.
session.doWork() is one of the solutions which I got. I want to know any other option available to do it.
You should move Transaction avatarUpdatePathTransaction = session.beginTransaction(); before the start of your loop and avatarUpdatePathTransaction.commit(); after the end of your loop.
The recommended pattern is to have one session per "unit of work", in your case this seems to be modifying multiple entities in a single session/transaction.
The session.flush(); is not necessary I think, committing the transaction should flush the session
I have to execute multiple insert queries using JDBC for which I am trying to execute batch statement. Everything works fine in my code but when i try to see values in the table, the table is empty.
Here is the code :
SessionImpl sessionImpl = (SessionImpl) getSessionFactory().openSession();
Connection conn = (Connection) sessionImpl.connection();
Statement statement = (Statement) conn.createStatement();
for (String query : queries) {
statement.addBatch(query);
}
statement.executeBatch();
statement.close();
conn.close();
And the
List<String> queries
contains insert queries like:
insert into demo values (null,'Sharmzad','10006','http://demo.com','3 Results','some values','$44.00','10006P2','No Ratings','No Reviews','Egypt','Duration: 8 hours','tour','Day Cruises');
And the table structure is like:
create table demo ( ID INTEGER PRIMARY KEY AUTO_INCREMENT,supplierName varchar(200),supplierId varchar(200),supplierUrl varchar(200),totalActivities varchar(200),activityName varchar(200),activityPrice varchar(200),tourCode varchar(200),starRating varchar(200),totalReviews varchar(200),geography varchar(200),duration varchar(200),category varchar(200),subCategory varchar(200));
No exception is thrown anywhere but no value is inserted. Can someone explain?
Most JDBC drivers use autocommit, but some of them do not. If you don't know, you should use either .setAutoCommit(true) before the transaction or .commit() after it..
Could be a transaction issue. Perhaps you're not committing your transaction? If so, then it is normal not to see anything in the database.
You can check if this is the case by running a client in READ_UNCOMMITTED transaction mode, right after .executeBatch(); (but before close()) and see if there are any rows.
You don't should assign a value to ID add supply all the others columns name
insert into demo
(
supplierName
,supplierId
,supplierUrl
,totalActivities
,activityName
,activityPrice
,tourCode
,starRating
,totalReviews
,geography
,duration
,category
,subCategory
)
values (
'Sharmzad'
,'10006'
,'http://demo.com'
,'3 Results'
,'some values'
,'$44.00'
,'10006P2'
,'No Ratings'
,'No Reviews'
,'Egypt'
,'Duration: 8 hours
','tour'
,'Day Cruises'
);
and add commit to your code
Working on a Spring application that uses Hibernate, and in my DAO layer we are running an UPDATE statement to update some values in an Oracle database.
To make sure I'm not crazy, I ran the statement in SQL Developer to make sure it works properly. Here is part of my DAO code:
public void updateObjectInMyTable(SomeClassA objectOfSomeClassA) {
Session session = getCurrentSession();
String sql = "UPDATE SCHEMA_NAME.TABLE_XYZ SET FIRST_NAME=:firstName, LAST_NAME=:lastName, ADDRESS=:address, CITY=:city, ZIPCODE=:zipcode WHERE ID_NUMBER = :idNumber";
SQLQuery query = session.createSQLQuery(sql);
query.setParameter("firstName", objectOfSomeClassA.getFirstName());
query.setParameter("lastName", objectOfSomeClassA.getLastName());
query.setParameter("address", objectOfSomeClassA.getAddress());
query.setParameter("city", objectOfSomeClassA.getCity());
query.setParameter("zipcode", objectOfSomeClassA.getZipcode());
query.setParameter("idNumber", objectOfSomeClassA.getIdNumber());
query.executeUpdate();
}
(Excuse the poor variables names used for substitutions of the real ones.) I did debug on the server and I do not see any errors with query.executeUpdate() It gets to that line, and doesn't pass on to the next statement I have in my service layer.
Anything I'm doing wrong?
Where's your transaction ?!
Use :
session.beginTransaction().commit();
add this in the end line of your code.
I hope this helps you.
question background:
1.database is neo4j 2.3.1, driver using jdbc;
2.db connection initialized as a class member, default is auto-commit(not changed);
To avoid insert duplicates, i query before insert. after program stopped, found duplicates. why?
code:
String query = "CREATE (n:LABEL {name:'jack'})";
System.out.println(query);
Statement stmt = dbConnection.createStatement();
stmt.executeUpdate(query);
stmt.close();
Use MERGE + unique constraints instead
How do you "check"
You would have to check in the same tx and also take a write lock
after debugging i found that for neo4j-jdbc(v2.1.4), the default db connection transaction level is TRANSACTION_NONE, then i set it to TRANSACTION_READ_COMMITTED, above issue disappeared. so i think that TRANSACTION_READ_COMMITTED will force the previous insert committed, though this is not the recommended way. for isolation level refer to:Difference between read commit and repeatable read
I have a native query that does a batch insert into a MySQL database:
String sql = "insert into t1 (a, b) select x, y from t2 where x = 'foo'";
EntityTransaction tx = entityManager.getTransaction();
try {
tx.begin();
int rowCount = entityManager.createNativeQuery(sql).executeUpdate();
tx.commit();
return rowCount;
}
catch(Exception ex) {
tx.rollback();
log.error(...);
}
This query causes a deadlock: while it reads from t2 with insert .. select, another process tries to insert a row into t2.
I don't care about the consistency of reads from t2 when doing an insert .. select and want to set the transaction isolation level to READ_UNCOMMITTED.
How do I go about setting it in JPA?
Update
So I ended up creating a regular SQL connection for this case as it seemed to me the simplest option. Thanks everyone!
You need to set it at the connection level, get the session from the entitymanager and do this:
org.hibernate.Session session = (Session)entityManager.getDelegate();
Connection connection = session.connection();
connection.setTransactionIsolation(Connection.READ_UNCOMMITTED);
In JPA you don't. JDO is the only standard that supports setting txn isolation. Obviously going for particular implementations methods can allow it, but then you become non-portable
Since you are using BMT, you can do the following using a datasource to get the connection.
and set the iso. level.
DataSource source = (javax.sql.DataSource) jndiCntxt.lookup("java:comp/env/jdbc/myds");
Connection con = source.getConnection( );
con.setTransactionIsolation(Connection.TRANSACTION_READ_UNCOMMITTED);