1. Closing a connection stackoverflow.comI am using a class DBConnection which has a static method createConnection.I create a connection object like |
2. Problem with not closing db connection while debugging? stackoverflow.comI have a Java app that opens a connection to a database at the beginning, and closes it at the end. However, the program doesn't always finish, because an exception is ... |
3. What is JDBC's Connection.isClosed() good for, and why is Snaq DBPool misbehaving on close? stackoverflow.comI have the following code in Java: |
4. How to close a db4o connection when application is shutdown/restarted? stackoverflow.comI have just started writing my first webapp using java/wicket/db4o and all technologies are new to me so please forgive what might be a daft question. I have created a simple MyDao ... |
5. Java closing connections and findbugs stackoverflow.comIn our code we usually use the following pattern: |
6. How to test if a database connection is closed successfully? stackoverflow.comNormally our framework classes hibernate will handle the opening and closIng of databse connection. But due to some technical requirement, we are required to open another db connection using a direct call ... |
7. closing and opening database connections? stackoverflow.comIn java application I need to check if data has been updated in my application and update the changes in other database. I have connection open to both database all the ... |
8. When to close connection? coderanch.comThis all depends on the type of application. Server applications are better off using a connection pool and aging your connections (closing the connection after a pre-determined amount of time). Creating a connection is an expensive operation so pooling saves time. Single user applications with limited access to the database benefit from closing the connection after the data is retrieved. Hope ... |
9. Problem closing the connection coderanch.com |
10. closing connections coderanch.com |
11. Closing Connection Which way ???? coderanch.comHi Friends, My Current strucuture of coding is a Centralised Java Bean which act as Connection Object Supplier Program to all JSP which needs DB Connections. So In my Jsp i used to hook a method of Java Bean which provides Connection from WebSphere DataSource Pool(WAS3.5.5-JDNI LookUp etc .etc). Jsp pages creates Statement,ResultSet , executes SQL queries and in finally block ... |
12. Closing connection problem coderanch.comHello, It is possible to close a connection in the same method (i.e. creating a statement + ResultSet,..). But when I am making several methods() within the same class to deal with different types of data + opening and closing the database, I cannot close it anymore with the close() method. Or is it better to open/close everytime you need to ... |
13. Connection Opening & Closing Every Time? coderanch.comHmm, I have been writing using JDBC for a while connecting to my Oracle 9i database. I have always re-written the same block of code try { Class.forName("oracle.jdbc.driver.OracleDriver"); Connection conn = DriverManager.getConnection("jdbc :-o racle:thin:@server:1521 :mrgreen: BName","scott","tiger"); PreparedStatement pstmt = conn.prepareStatement(queryLookupString); ResultSet rset = pstmt.executeQuery(); System.out.println(queryLookup); while (rset.next()) { ... } } catch(Exception e) { e.printStackTrace(); } and I was curious if ... |
14. Leave connection Open or Close it??? coderanch.comUp to this point, I have been storing the username and password in a Vector that I access whenever I need a connection to the Database. When I am done with the connection, I close the connection. I was wondering what would be the problems in cretaing a single connection when the user logs into the database, and just keeping it ... |
15. Help with closing jdbc connections coderanch.comI think you should take a look at incorporating a connection pool instead. Constantly creating new connections can create a performance problem and a connection pool will take care of closing connections when needed. For example, in one of our apps, we have a servlet that initializes a connection pool in its init() method and then "closes" the pool in its ... |
16. How can i close a connection to Access97? coderanch.comhello, i think, i have a smal problem, but i can't see the solution. i created a connection to access97, i can read the datas in the tables, but the connection doesn't close. ... Class.forName ("sun.jdbc.odbc.JdbcOdbcDriver"); connection = DriverManager.getConnection ("jdbc:odbc:Driver={Microsoft Access Driver (*.mdb)};DBQ=" + currentDB); statement = connection.createStatement(); connection.setAutoCommit(false); resultset = statement.executeQuery("Select ..."); ... resultset.close(); statement.close(); connection.close(); in line connection.close(); access ... |
17. Connections not getting closed, Urgent please coderanch.comThanks in Advance Actually i am having the problem with the connections, the problem is even though i am closing the connection in finally block some connections are not getting closed. i am using JSP,DB2,WebSphere the code is in my session bean can any one can say why the connections are not getting closed even though i am explecitely closing before ... |
18. Result Sets and Closing Connections coderanch.com |
19. connection pool in UDB does not close connections coderanch.comWe are getting connections from the pool and closing them after we done, which releases connections to the pool. But even after the application is closed connection to UDB is still exist. Does anybody experience this? Connection conn = null; Statement stmt = null; ResultSet rs = null; try { conn = DBHelper.instance().getConnection(false); sql.append("SELECT ID FROM TABLE WHERE KEY = " ... |
20. Connection.close hangs coderanch.comHi, I have a connection which executes an Oracle Procedure through CallableStatement. The procedure takes about 5 minutes to complete. When i call the close method of that connection from another thread, the connection hangs. It will remain in that state until the statement execution is over. I am having problems because of this since i call the connection close method ... |
21. Closing connection coderanch.comDepends on the database provider, but most of the time, the connection times out and get's closed automatically. Of course, if you are using connection pooling, there should always be open connections anyway. Depending on the provider and your app, it isn't a huge deal if a connection doesn't get closed. But I have seen it cause some locking problems. |
22. How do the connections get closed in Connection Pool coderanch.comNormally a connection pool is used for giving connections to the users based on the request for a connection by the user. now let us say i have a connection pool where i have a max of 10 connections and i open these 10 connections but after sometime i close all the connections. therefore when i do that all the connections ... |
23. close connection coderanch.comThanks guys, actually I don't really understand what is a db connection in a more low level term. Can someone help me with this? Is it an IO stream? Beside of taking resource in the jvm, did it also take resource in the database? If it is, and it was closed automatically (either by application exit or timeout), did it also ... |
24. jdbc connection suddenly closed coderanch.comI have the following code in a Session Bean: ... conn = utilObj.getConnection(); System.out.println( "conn obj = " + conn ) ; System.out.println( "conn closed = " + conn.isClosed() ) ; SomeClass someObj = new SomeClass(conn, arg2, arg3); ... SomeClass constructor just has: public SomeClass(Connection c, String arg2, String arg3){ System.out.println( "conn obj = " + c ) ; System.out.println( "conn ... |
25. Closing connection coderanch.com |
26. connection.close coderanch.com |
27. What happens if Database Connections not closed? coderanch.com |
28. Connections that won't close coderanch.com |
29. Strange problem cause the connection failed in close coderanch.comHi, everybody, Can any one help me on this. Now I am developed a program to scan all the record in the database, but when reading one record(which is CLob type) cause me failed in close the connection. It throws out. java.sql.SQLException: Protocol violation at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:134) at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:179) at oracle.jdbc.dbaccess.DBError.check_error(DBError.java:1160) at oracle.jdbc.ttc7.Ocommoncall.receive(Ocommoncall.java:149) at oracle.jdbc.ttc7.TTC7Protocol.rollback(TTC7Protocol.java:488) at oracle.jdbc.driver.OracleConnection.rollback (OracleConnection.java:1412) at com.core.esg.database.NonAutoCommitConnection.close (NonAutoCommitConnection.java:169) at ... |
30. what if we do not close DB connection ? coderanch.com |
31. major problem with connections not closing coderanch.comWe had a major problem in which we tried to roll the web app over to running against an Oracle database, and the number of open connections in our pooling code (that worked fine with the old database) blew up when lots of users started getting onto the site. The connections just were not being released, and any JDBC calls starting ... |
32. connection already closed problem coderanch.comtrupti, your description is quite mixed, or i am not able to get it properly. your method A calls B (in method B you are creating a connection) after processing of B again you are creating a connection and sharing it with methdo C. now question is why are you not sharing connection with B ??? create connection before calling method ... |
33. closing the database connection coderanch.comHello All, In my code, I have made sure that I am closing all the open dataBase connections like below: finally{ if(con!=null){ dao.close(null,conn); } } where conn is the connection object. and null is for preparedStatement. In the dao close() method if connection is not null, con.close() (java method) is called. While debugging the application , I found out that the ... |
34. DSRA9110E Connection is closed coderanch.comDear all, My MDB EJB application retrieves a MQ message, it creates a thread to handle this MQ message. This thread uses SQLJ and datasource to connect to DB2 and insert/update all data to database. When the number of MQ Messages (e.g. 10, 100) are received by MDB and the corresponding of threads are trying to insert/update its data to DB2, ... |
35. Invalid state, the Connection object is closed. coderanch.comdrivers of SQL server can act erratic and there is every possibility that jTDS closes the connection on it's own. I know one thing for sure that MIcrosoft's driver was opeing a lot of implicit connections when I evaluted that one. I am assuming that you are not closing the connection any where.If this be the case, If I were you ... |
36. Does closing Connection always close related JDBC objects coderanch.comA properly programmed JDBC driver will have references in the Connection object allowing it to close all child objects before it itself is closed. Some people swear that not all drivers are properly programmed and insist on explicitly closing all resources themselves; it's not a bad practice anyway and can't hurt, it gets your code in a state where its easier ... |
37. Difference between close & null with regards to connection coderanch.comOriginally posted by Ashutosh Limaye: Assume Connection con=DriverManager.getConnection("Some Driver URL"); what is the difference between saying con.close(); and con=null; The first one is a good way to do it and the second one is a bad way to do it. Yes. The second will cause the resources for at least the connection object in YOUR program to be garbage collected. BUT ... |
38. I need advice on closing connection and stmt after use coderanch.comHi Thank you for reading my post. I want to know , how and where i should close statement ,PreparedStatement, Connection that i use in my source code. imagine that i have a try catch block , so inside Try i create the connection , statement ,... I do all my jobs here. if my source code execution face any exception ... |
39. How do you close the JDBC connection back to the Connection pool? coderanch.comThe question is ambiguous - do you mean "how do you close a connection" or "how do you hand it back to the connection pool"? The previous answers assume that you want to close the connection, but if a connection pool is involved that's most likely not what you want to do. The pool implementation opens and closes connections - the ... |
40. How to correctly close the Connection object? coderanch.comHi, I am having a connection object and getting conectin from some class. my DbClass method getConnection throws an exception if it is unable to make a connection. the code is like Connection con; try { con = DbClass.getConnection(); Statement st = con.getStatement(); .......... st.close(); } catch (Exception Ex){ } finally{ con.close(); } Suppose the con is not establish in DbClass.getConnection, ... |
41. Closing connections properly... coderanch.comHi guys Is it ok to just set a connection object to null? like conn=null, instead of using conn.close() ? An application was turned over to me and it's having null pointer exceptions with it's connection objects. The error is very intermittent though, so i thought the number connections is getting over the limit of the maximum number of connections set... ... |
42. Close connection coderanch.comIt's good practice to close it if you no longer need it, since it consumes limited system resources (namely, a port). If the "connection" object goes out of scope and is garbage-collected, that will have the same effect -eventually- as closing the connection explicitly, but that's not good style at all. In many cases you need the connection more than once, ... |
43. Closing Database connections coderanch.comI have a Pagination using Scriptlet that works great where I am using two database connections to the MySQL database. Now I want to close the connections correctly but cant seem to figure out the best way to do it. I assume for JSP this is okay to open up the database connections the way this program is running but was ... |
44. JDBC Closing a Connection coderanch.comHi All, In our application we are using JDBC to connect to DB2 running in Mainframe. The application is used to create very large reports. Sometime the users may run a report which may run for more than an hour so the user may close the application screen abruptly by clicking the browser top right X button. Here in my application ... |
45. connection not closed coderanch.comA have solved this kind of problem with a single class which handles the connection with the database and also closes the connection. This class is tested and I know for sure that the resultset and the needed connection is closed. If you've a huge application it's important to have a good design in which you have a separation of concern. ... |
46. Closing The connection (Database) coderanch.comHi, In my web application. i have one java class which contains more than 20 method. each method does database related operations. so i have created one constructor for that class. which parse xml for connection and create one connection conn. I'm using 1 connection for all the 20 method. now ideally where should i close the connection ??? if i ... |
47. Why we want close connection ?. coderanch.comHi Praveen, it's always better to close connections immediately if you know you don't need them anymore. I can imagine that it depends on the JDBC implementation if connections are closed correctly when you shutdown an application. If they're not closed correctly they may still appear as opened on the server side and so eating up resources and locking out other ... |
48. Connection close issue coderanch.comHi All, Thanks a lot in advance. We are facing a serious problem with Connections. How can I identify through programatically how many connections are opening and closing while browsing the application. Is there any way to find out in Java/Oracle to find out open connections. Without verifying line by line code beacuse we 1000 files. Please help me . Reagards, ... |
49. Connection is already closed.due to Firewall coderanch.comHi All, I have a query which is taking more then 2 hours to run on a remote machine .But my application server is behind the firewall so the firewall is dropping the ideal connection (waiting for results )after every hour . Please help me .Is there a way to maintain connection . ========================================================== Caught IOException: com.sybase.jdbc2.jdbc.SybConnectionDeadException: JZ0C0: Connection is already ... |
50. Connection close problem? coderanch.com |
51. Connection closing - pooling, without pooling. coderanch.com |
52. connection validation and connection close method in connection pooling when DB is down coderanch.comThe scenario is like this. A connection pool was configured with application server Minimum number of connections > 0 were configured. Hence they will be instantiated at server start up. I used some of the connections and closed them except one. Meanwhile DB went down. The requirement is I want to check if this is a valid connection or not with ... |
53. Why does my Connection.close fail? coderanch.comI didn't know that even existed (I am just learning this stuff, but probably should have looked up all the available stuff in x) Anyway, I test the method with this block of code: try { ResultSet myRs = myDbUtils.doSelectQ(myQ); System.out.println("ResultSet myRs returned \n"); while (myRs.next()) { route_id = myRs.getString("route_id"); System.out.println("ROUTE_ID=" + route_id + "\n"); } } catch( SQLException x ) ... |
54. Just closing connection enough? coderanch.comHi friends..This is my first post...I am a newbie Java Developer..Okay Here goes I have just made a LAN based Java application using Swing,JDBC with backend as MS-Access..The backend is on a shared network drive.. The application is distributed as jar files on the LAN PCs.. Everywhere I have connected to the database I have just closed the connection explicitly like ... |
55. Doubt while closing connection. coderanch.comI believe, there are very few, if there are, applications which don't use pooling for connections. So, in case you are employing a pooling mechanism, then there is no closing for connections on your end, therefore you must close statements and resultsets. Of course you need to set the connection back to the pool. I believe, closing a statement should automatically ... |
56. OrionCMTConnection not closed, check your code! Logical connection not closed, check your code! coderanch.comHi, I am getting OrionCMTConnection not closed, check your code! Logical connection not closed, check your code! (Use -Djdbc.connection.debug=true error while i execute my application from LIVE container, i am using oracle oc4j container to deploy and execute my application. I am not getting this error when i run my application locally, i am using jdeveloper and oc4j container locally. |
57. closing connection? coderanch.comDear friends, I have a problem with making and closing the connection to my data base. let me explain, I closed my CONNECTION and PSTMT after insert query but when I run this code after the first round I get the below error : code: trigger code: DB2 DB2= new DB2(); for (int i=0;i<7;i++) { DB2.insert("Celeron","Intel2",85,106,0.33,3,2.5,0.33,7,0.33); } insert code: public static ... |
58. JDBC Connection gets closed just after it is created. coderanch.comMy application is using following way to create a statement through a connection. 1: Connection conn = null; 2: try { 3: conn = ServerUtil.getConnection(); 4: ps = conn.prepareStatement(sql.toString()); 5: : 6: : 7: } catch { 8: } 9: finally { 10: ServerUtil.releaseConnection(); 11: } ServerUtil is a utility class which provides method to get instance of connection and closing ... |
59. difference between connection.close() and con = null coderanch.comRahul.p Kumar wrote:when we close() the connection (layman term), then what exactly it does with that connection object or driver class You don't know and you don't care. Its not for a programmer to look inside a JDBC driver and determine how/what it does. The only thing you need to know is that any time you get a connection you *must* ... |
60. Result of JDBC connection not closed coderanch.comYou need to be wary when the resources used are not Java resources. A database Connection is owned and managed by the database, the Class just gives you access to that database resource. If you don't close the connection then the Java class can be garbage collected, but the Database may not be able to tell that the connection is no ... |
61. Close the Database Connection in finally block coderanch.com |
62. I'm holding a connection open even though I close it? coderanch.comHi all, I'm connecting to a SQL Server 2008 DB, and my code is apparently holding connections open in the DB, as evidenced by the Activity Monitor (sleeping - waiting for command), and in reports - Activity All Sessions (Show as a connection, 'no active requests on the session'). I'm closing my ResultSet, my Statement, and my Connection. Is this not ... |
63. DBUtility for closing connections coderanch.comHello, should the DB utility classes be used for closing the connections, if the connections is also obtained using the same DB utility classe. Since the connection returned from the getConnection() method has still a reference to the connection object which is never closed. for example in the below mentioned example the connection is not null even after calling the metod ... |
64. Do we need to close the Connection while using Connection Pooling? coderanch.com |
65. Finding connections that aren't closing coderanch.comHey all, I've got a small project ahead of me; there is an application that is not closing a connection, somewhere, somehow, it isn't clear where. We know it is happening because slowly the connections in the database will ramp up. I've set the max connections in tomcat so after 5 it will refuse more connections and it appears to be ... |
66. jdbc connections not closing coderanch.comI'm stumped with this one: Im using the following: Hibernate 3.5 with c3p0 Struts2 Tomcat 6.0.29 Java 6 I get an error indicating a memory leak whenever the webapp is reloaded without shutting down Tomcat completely. For example, I see the following when the webapp reloads in Eclipse: Jan 29, 2011 11:20:50 AM org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc SEVERE: The web application [/MyApp] registered ... |
67. Closing database connections properly? coderanch.comHello. I sometimes experience that a database connection is never getting closed in my web application. How do I ensure that the database connections i properly closed? What if the user loads the web site twice (starting a new thread for each load), before the first connection is closed? Here is two cases: Case 1: If a user reloads the page ... |
68. OrionCMTConnection not closed, check your code! Logical connection not closed, check your code! coderanch.comHI Once again iam repeating my query..Please respond. I am using JDeveloper 10g and oc4j server. I am getting below message. OrionCMTConnection not closed, check your code! 11/07/29 18:51:36 Logical connection not closed, check your code! 11/07/29 18:51:36 (Use -Djdbc.connection.debug=true to find out where the leaked connection was created) I already read a thread in this forum that given me almost ... |
69. Opening the Closed Connection coderanch.com |
70. How to close db connection coderanch.comHi, I am making a small application. I have a separate class which inserts or gets the data from database. I want to know how to close the connection of database? Should I do con.close(); in every method or closing the connection in finalize() method is sufficient? public class DatabaseClass { private Connection con; //no argument constructor public DatabaseClass throws ClassNotFoundException ... |
71. How to close JDBC Connection java-forums.org |
72. Close connection object java-forums.orgHi I have made a client/server application. After say x number of socket connections the sever is not sending the object across the network to the client. Initilay I thought its a socket or stream problem but now I have the feeling that it could be something related with database connection object. There is proper socket connection every time, but I ... |
73. Do we requires to close the connection? java-forums.org |
74. Closing JDBC connection forums.oracle.comWhat kind of application are you writing? One user desktop application? Multiple user server/web application? Database connections are generally considered a scarce resource. First, the target database can normally only keep so many open at a time simultaneously. Second, there is more latency in creating the connection than in simply executing a database operation. That leads to a number of considerations. ... |
75. Closing connection to db after redirect forums.oracle.com |
76. When to close database connection forums.oracle.comI'm working on an application that reads a customer number from an Access database and returns the name, address, etc of the customer number. My question is the following, is it best practice to close the database each time the request has been processed, and open it every time a request is made? |
77. When to close database connections forums.oracle.comI'm surprised there isn't an implementation in the JRE, that you have to include the DBCP or C3P0 jar. Even if you are writing a simple client/server application, using a connection pool of size one handles the headache of having to reestablish the connection if it times out when your user take a coffee break. |
78. Closing connection in JDBC forums.oracle.comI have a while loop that executes every 10 sec and needs to retrieve/update some fields in a database. I would like to know the efficient way to create and close a connection in this scenario. Should I create one connection before the beginning of while loop and write the close statements after the loop (this might not get executed if ... |
79. close database connection... forums.oracle.com"The finalize() method may be called automatically by the system, but when it is called, or even if it is called, is uncertain. Therefore, you should not rely on this method to do your cleanup for you. For example, if you don't close file descriptors in your code after performing I/O and you expect finalize() to close them for you, you ... |
80. Null Pointer when Closing JDBC Connection forums.oracle.comI'm getting a null pointer error when trying to close my statement, connection, and result sets. My progam leaves the SQL query class I made to work with the resultset in another class, then returns to the SQL query class to close the connections. I am able to work with the result set in the other class OK, but I cannot ... |