java - JdbcTemplate select for update -

-

i have spring application reads data database , sends system 'x'. using task executors spin threads, there 5 threads reading database rows @ same time. each thread need make sure unique records selected. achieve using jdbctemplate , "select update"

i have written code in logs able see 2 threads picking same rows. not able figure out root cause of issue. has suggestion

try {     list<map<string, object>> rows = getjdbctemplate().queryforlist(                         select_for_update,                          new object[] {a,b,c,d});       (map<string,object> row : rows) {          header = new header();         a.setmailid(((bigdecimal)row.get("mailid")).intvalue());         a.setversion(((bigdecimal)row.get("version")).intvalue());         // other parameters           getjdbctemplate().update(update_msg_state_version_n_orig_msg_stat,                                   x,                                  a.getversion()+1,                                  y),                                  a.getmailid(),                                  a.getversion());          headers.add(a);     } }  update_msg_state_version_n_orig_msg_stat = update message set msg_stat_cd = ?, version_nbr = ?, orig_msg_stat_cd=?, last_upd_ts=systimestamp message.mail_id = ? , version_nbr = ?   string select_for_update = "select m.mail_id mailid, m.version_nbr version, m.msg_stat_cd state,"                  + "from message m                 + "and m.msg_stat_cd in ('nerwerw')"                 + " , m.create_ts > (sysdate - ?)"                 + " , mod(mail_id,?) = ?"                 + " , rownum <= ?"                 + " order mt.msg_priority update";

have had transaction control set up?

if not, transaction happen duration of update statement, , committed automatically (you using oracle believe, base on syntax).

that means, although acquired lock of records, released right-away.


Comments

Post a Comment

Popular posts from this blog

PHP DOM loadHTML() method unusual warning -

-
i had following code works fine on localhost: $document = new domdocument(); $document->loadhtml($p_result); $form = $document->getelementsbytagname('form')->item(0); // code continues using $form variable after same code updated on outside server, loadhtml() failed , issued warning. warning: domdocument::loadhtml() expects parameter 1 valid path, string given in path/name/to/script.php returned null instead of object code pretty gets fatal error. note contents of $p_result absolutely same on outside server , on localhost. but why displays kind of warning , why not work? doesn't loadhtml() expects argument 1 string in first place? why method expects parameter 1 valid path ? just make clear i'm not calling loadhtmlfile() , i'm calling loadhtml() . thanks. you're affected one of php bugs . issue present in php 5.6.8 , 5.6.9. have affected php version on server, , bug-free version on localhost. the bug forbids null
Read more

python - How to create jsonb index using GIN on SQLAlchemy? -

-
here's current code creating index jsonb. index("mytable_data_idx_id_key", mytable.data['id'].astext, postgresql_using='gin') but got error. sqlalchemy.exc.programmingerror: (psycopg2.programmingerror) data type text has no default operator class access method "gin" hint: must specify operator class index or define default operator class data type. [sql: "create index event_data_idx_id_key on event using gin ((data ->> 'id'))"] is there way create index on sqlalchemy? the postgresql specific sqlalchemy docs @ http://docs.sqlalchemy.org/en/latest/dialects/postgresql.html#operator-classes mention postgresql_ops dictionary provide "operator class" used postgresql, , provide example illustrating use: index('my_index', my_table.c.id, my_table.c.data, postgresql_ops={ 'data': 'text_pattern_ops',
Read more

c# - TransactionScope not rolling back although no complete() is called -

-
i'm using transactionscope rollback transaction fail bool errorreported = false; action<importerrorlog> newerrorcallback = e => { errorreported = true; errorcallback(e); }; using (var transaction = new transactionscope()) { foreach (importtaskdefinition task in taskdefinition) { loader.load(streamfile, newerrorcallback, task.destinationtable, processingtaskid); } if (!errorreported) transaction.complete(); } i'm sure there no transactionscope started ahead or after code. i'm using entity framework insert in db. regardless state of errorreported transaction never rolled in case of error. what missing ? transactionscope sets transaction.current . that's does. wants transacted must @ property. i believe ef each time connection opened reason. probably, connection open when scope installed. open connection inside of scope or enlist manually. ef has nasty "design decision": default opens
Read more