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Committing changes to database


Committing changes to database

By : HindiTracks
Date : November 22 2020, 02:42 PM
this will help I tried to piece together the code fragments you posted in the comments, and I see something wrong with your code.
code :
public <T> T mergeEntity(T entity) { 
    entity = em.merge(entity); 
    commitTransaction(); 
    return entity; 
}

private void commitTransaction() { 
    final EntityTransaction entityTransaction = em.getTransaction(); 
    if (!entityTransaction.isActive()) { entityTransaction.begin(); 
    } entityTransaction.commit(); 
} 
entityTransaction.begin(); 
entity = em.merge(entity); 
entityTransaction.commit(); 


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Committing dataset changes to database

Committing dataset changes to database


By : amit.ablaze
Date : March 29 2020, 07:55 AM
will be helpful for those in need I'm working with a dataset that's connected to an sql server and what I'm trying to do is delete multiple rows at once and then saving the changes to the sql server. I've tried it with the code below: , try without AcceptChanges
code :
DataRow[] rows = this.computechDataSet.VALHIS.Select("VAL_SRT = '" + this.computechDataSet.V_ALUTA.Rows[this.v_ALUTABindingSource.Position][0].ToString() + "'");
foreach (DataRow row in rows)
{
    row.Delete();
}
this.tableAdapterManager.UpdateAll(this.computechDataSet);
Add association (<<) without committing to database

Add association (<<) without committing to database


By : Ben Foote
Date : March 29 2020, 07:55 AM
I wish this helpful for you Is it possible in Rails to add an association to an existing record without immediately committing this change to the database? E.g. if I have Post has_many :tags , This should work in Rails 3.2 and Rails 4:
code :
post.association(:tags).add_to_target(Tag.first)
post.association(:tags).send(:build_through_record, Tag.first)
# Tested in Rails 4.2.5
Performance Difference Between Explicitly Committing vs Auto-Committing Transactions in MySQL and SQL Server

Performance Difference Between Explicitly Committing vs Auto-Committing Transactions in MySQL and SQL Server


By : AndreasEzban
Date : March 29 2020, 07:55 AM
seems to work fine Using explicit transactions should be faster especially if you do a lot of inserts or updates.
For implicit transaction (autocommit = 1 in MySQL), database engine have to write transaction log to disk (or disk cache for that matter) after each statement. For explicit transaction (autocommit = 0 in MySQL), database engine can potentially have only one input/output operation for writing transaction log for all statements used in a transaction.
code :
UPDATE balance b1 JOIN balance b2
    ON b1.id = 1 
   AND b2.id = 2
   SET b1.current_balance = 40,
       b2.current_balance = 50
UPDATE balance 
   SET CASE id WHEN 1 THEN 40 
               WHEN 2 THEN 50
       END
 WHERE id IN(40, 50)
pyodbc not committing changes to db2 database

pyodbc not committing changes to db2 database


By : Gleb Chudetsky
Date : March 29 2020, 07:55 AM
may help you . As OP found out, the application layer language, Python, may not raise specific database exceptions such as duplicate index or foreign key issues and hence will silently fail or will be logged on server side. Usually errors that affect actual SQL queries to run like incorrect identifiers and syntax errors will raise an error on client side.
Therefore, as best practice in programming it is necessary to use exception handling like Python's try/except/finally or the equivalent in other general purpose languages that interface with any external API like database connections in order to catch and properly handle runtime issues.
code :
try:
    conn2 = pyodbc.connect(...)
    db2 = conn2.cursor()

    sql = "..."
    db2.execute(sql, params)
    conn2.commit()

except Exception as e:
    print(e)

finally:
    db2.close()
    conn2.close()
JTATransactionManager Not Committing To Database

JTATransactionManager Not Committing To Database


By : jack dowson
Date : March 29 2020, 07:55 AM
Does that help I think you need to add to the context xml. That will run a context post processor that will wrap methods with @Transactional with an AOP method interceptor that provides the transaction behavior you're looking for.
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