[GENERAL] Swing JTable and ResultSet TableModel (with big resultsets)
Hi, I don't know if this is the right list for this question but I don't know where to ask... I have a question about JTable and a ResultSet TableModel (using JDBC postgresql driver). I have to develop a swingJTable application that gets the data from a ResultSetTableModel where the user can update the jtable data. Theproblem is the following: the JTable have to contain the whole data of the source database table. Currently I have defined a a TYPE_SCROLL_SENSITIVE CONCUR_UPDATABLE statement. The problem is that when I execute the query the whole ResultSet is "downloaded" on the client side application (my jtable) and I could receive (withbig resultsets) an "out of memory error"... I have investigate about the possibility of load (in the client side) only a small subset of the resultset but with no luck. In the maling lists I see that the only way to load the resultset incrementally is to define a forward only resultset with autocommit off, and using setFetchSize(...). But this solution doesn't solve my problem because if the user scrolls the entire table, the whole resultset will be downloaded... In my opinion, there is only one solution: - create a small JTable "cache structure" and update the structure with "remote calls" to the server ... in other words I have to define on the server side a "servlet environment" that queries the database, creates the resultset and gives to the jtable only the data subsets that it needs... (alternatively I could define an RMI client/server distribuited applications...) This is my solution, somebody can help me? Are there others solutions for my problem? Thanks in advance, Stefano
[GENERAL] database file encryption
Hi all, I have just discovered that in postgres database file the data are not encrypted. If I open with a text editor these files I can read the records values. I'd like to know if there is a way in order to encrypt these data. PS. for example in mysql the database file are not readable. Thanks ad advance. Stefano
[GENERAL] Data warehouse OLAP
hi, I'm working in the implementation of a datawarehouse on Postgres. For analisys of aggregated data I'd like to use some OLAP tools like for example, Mondrian, OR use the meterialized view (if better). My questions: isthere anydocumentation about warehouse (with OLAP or materialized view)on Postgres? Which is better? OLAP tools (I think) or materialized view? Any information is welcome! Thanks Stefano
[GENERAL] Finding missing records
Hi, I have two identical tables table1 (f1,f2,f3,f4 primary key (f1,f2,f3,f4)) table2 (g1,g2,g3,g4 primary key (g1,g2,g3,g4)) How can I find the difference between the two tables? table1 has 1 records table2 has 9900 records (these records are in table1 as well) I'd like to find 100 missing records. I have try this query select f1,f2,f3,f4 from table1 where (f1,f2,f3,f4) NOT IN (select f1,f2,f3,f4 from table2) but it seems not work (as I want). It returns me no records. If I use the IN clause it returns me all 1 table1 records. Thanks in advance Stefano
[GENERAL] could not connect to the server error
Hi, I have several java jdbc client applications that connect to my Postgres 8.0.4 server. "After some days" the server rejects the connections. There are nomessage in the log file.Only the local connections are permitted. I have tryed to make a connection with EMS postgresql and I receive the following error: could not connect to the server: Connection refused (0x274D/10061) Is the server running on host 213.212.159.153 and accepting TCP/IP connections on port 5432? the LOCAL CONNECTIONS are accepted. Could be a JDBC problem? It seems that "something" is still open and postgresql can't create a new connection. I had this problem with the older 8.0.x postgres version. OS is FreeBSD 5.3 Any help will be appreciated. Thanks.
[GENERAL] Postgresql server crash after some day
Hi all, I have some strange problems with postgres. After some days it works in local but it doesn't listen on port 5432 for remote request. I can make a connectionfrom local host but I can't from remote host. If I try to make a connection from remote host the server returns me the classic remote error: could not connect to server ... is the server running on host ... and accepting TCP/IP connections on port 5432? This problem happens after some day that I have start the server. There is noparticular error in the log file (the server seems to work) PostgreSql version: 8.0.3 on FreeBSD 5.3 Thanks in advance.
