I have an ODBC database on Windows Server 2008. Typically I use Access or PHP when I want to work with it, but for reasons I need to connect to it with Java now and it's proving more difficult than I thought it would. Most other questions on this topic are dealing with MS Access, but I'm not in this case and while maybe I could create an MDB file with linked tables then use something like UCanAccess I really don't want to try going there.
So in PHP I can connect to the database with the line:
$conn = odbc_connect("ODBC;ServerName=127.0.0.0;DSN={$odbc_name};",$user,$password);
Is there something equivalent I can do with jdk1.8.0_181? Or is this something where I'd have to revert back to jdk1.7 and use ODBC Bridge?
Edit: I should add that the DB I'm trying to access is not on SQL Server, but rather a more obscure platform called Pervasive SQL. It is still ODBC though.
Related
I'm trying to write a small program for CRUD operations against an old Pervasive 9 database, but as soon as I try to get a connection with Drivermanager.getConnection it throws
"java.io.IOException: LNA session closed"
I've read THAT post but copy/paste on that code didn't help me. Could be it configuration on that Pervasive 9 machine? Is it JDBC10 driver that won't play nice with older versions?
Or.. is it me being stupid? (everything is always possible)
Regards
According to Pervasive, using a newer client to an older engine is not recommended. This is documented at http://docs.pervasive.com/products/database/psqlv11/wwhelp/wwhimpl/js/html/wwhelp.htm#href=getstart/installprep.02.6.html#149125.
That doesn't mean it won't work but there's no guarantee. There are reports of the Btrieve interface working properly but the relational (SQL, ODBC, JDBC) side fails more often mainly because it changes between major versions where the Btrieve side stays the same.
I would suggest using the v9 client (and JDBC driver) or upgrading the server to v10.
#elwis your trouble it's the conecction with the database. I recommend you, make a connection using a reverse ssh tunnel against the machine where you have the database first with port by default of pervasive.
Something like: ssh user#yourmachine -L 15831:192.1X.X0.X80:1583
Then, using the tool can generate the connection DBeaver to see and do what you need.
That works for me.
Good luck.
Sorry Maybe this is the second time I am Asking this question because of not getting any answers .
this is my Code
try{
File f = new File("Database.sql");
if(f.exists()){
Class.forName("com.mysql.jdbc.Driver").newInstance();
Connection con = DriverManager.getConnection("jdbc:mysql://localhost/"+f.getName(),"","");
}else{
f.createNewFile();
System.out.println("file created");
//also do the connection
}
}catch(Exception ex){
System.out.println(ex.getMessage());
}
and Here is the error :
Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
The purpose of this question is:
I am creating an Application that is for many users, the problem is they don't know anything about computer and I must make it as simple as possible.
So is there any way to connect with MYSQL like MS ACCESS via Directory Path ?
OR is there any other suggestion instead ?
Thanks .
AFAIK, you can't plug in a file name in the JDBC url for MySQL. MySQL needs to be running, and you need to connect to it via its TCP port. Something like:
jdbc:mysql://localhost:3306/yourDatabaseName
See http://dev.mysql.com/doc/refman/5.6/en/connector-j-reference-configuration-properties.html
Preliminary definitions
"Connect to a MySQL database file" is improper phrasing.
One actually connects to a MySQL database server, which allows access to a database. And so there must be a MySQL server to connect to, more about that below.
Your Database.sql file is a database dump file, that is to say, a dumb (plain text) file. You need a specialized process to extract data from it, after interpreting your SQL queries: a database server.
You might be assuming that one can connect to a file because you are used to working with MS Access files. I am not an expert neither in Java nor in MS Access, but it is my undestanding that accessing a MS Access "database" file from Java actually means connecting to some middleware server, such as this ODBC thingy from Microsoft.
The answer
There is no way to connect to a MySQL database server via a directory path. The only native ways are:
TCP
Local socket (Unix servers only)
Named pipes (Windows servers only)
Shared memory (Windows servers only)
There could be some third-party pieces of software around that provide other protocols, which I am not aware of, but they all reduce to the same problem: there must be a MySQL sever running somewhere.
On second thought there is actually one way to access MySQL data without an external MySQL server running: the embedded MySQL server C library. I never tried it myself, but it looks like a viable option for stand-alone applications. I do not believe, however, that it is a desirable solution if you plan to share the same MySQL data across several processes or computers.
The workarounds
Now I understand you are building a Java desktop application based on data that you have in the form of a SQL dump file, probably dumped from a MySQL server. If you want your users to be able to access this data from this Java application, I can see a few options:
Install a MySQL server on their computers and load this dump into it. Obvious as hell, but impractical, if I hear you well. Although I guess this installation could certainly be performed automatically by your Java application.
Install a MySQL server on a machine of your own, and make it accessible from your users' computers. Major drawback: it requires your users to be connected. You would also probably want to create a distinct database for each user.
Use an actually serverless database engine such as SQLite. This seems to be the best option for you. Its SQL syntax is virtually identical to MySQL for usual operations. There must be plenty of JDBC drivers for it. Again, I am not the best advisor in Java, but this one seems to be a serious candidate.
I want to connect oracle database without oracle client.After searching that how can i do this, figure out I must be use oracle instance client . But how can I use this? Icant find something about that.
The recommended (and most frequently used) JDBC driver for Oracle is the "thin driver". It doesn't need anything installed on the client (and is free).
This FAQ might be useful : http://www.orafaq.com/wiki/JDBC
Oracle client is a software that can easily be found and downloaded from oracle.com website. It has different versions for Windows, Linux, etc. After installing appropriate client, you will be able to communicate with the database by specifying its parameters such as host address, username, password etc. Without it, I think it's not possible to communicate with the database server.
http://www.orafaq.com/wiki/JDBC
On this page it says: "You must use a JDBC OCI driver appropriate to your Oracle client installation." What I understand from here is that you should use JDBC driver in your application, but without client installed, it will be nonsense.
My Java application uses a .mdb database and i want to run this application on MAC OS for that am definitely gonna nead a TYPE 4 JDBC driver i have google and came across two
- HXTT & StelsMDB but both are out of my reach
So if any body has some alternative or suggestions please reply.
Thanks in advance
I've used jackcess to read the tables from an MDB and convert the database to sqlite3. Not ideal if you need to keep the .mdb format, but it allowed me to keep the database in a single file and made the database cross-platform.
MS Access databases on MS Windows are driven by the Microsoft Jet Engine. Different from client server database management systems like MS SQL Server or MySQL the connection to a MS Access database runs in embedded mode via OLE and some DLLs.
As far as I know there is no Jet Engine implementation for operating systems other than MS Windows. So if you want to connect to a MDB file on Mac OS a simple JDBC driver is not enough. There has to be some kind of emulation layer to emulate the Jet Engine DLLs. According to the HXTT website this is exactly the way the HXTT JDBC driver works.
From the HXTT website:
It contains a fast database engine
written in Java, which supports
embedded and server modes.
If the usage of the MS Access database format is an absolute requirement, then these kind of emulation might be the best way for you. But you have to testify if the compatibility level is high enough. (Maybe there is no way to access VBA macros contained in the MDB file.)
It seems there is no open source project doing the same kind of emulation like HXTT.
There are several alternatives. If you want an embedded database system then you can use for example
SQLite (this JDBC driver supports Mac Os) (one database file, requires some native libraries),
H2 (only a few database files, pure Java) or
Apache Derby (many database files, pure Java).
Or you can use a client server database management system, install the server on a host and connect to that host from your Mac OS machine. For that you can use for example
PostgreSQL
Firebird
MySQL
Even the pure Java databases H2 and Derby have client server modes.
I suppose UCanAccess is what you are looking for.
It is an open source Java JDBC Driver implementation which allows Java developers and jdbc client programs (e.g., DBeaver, NetBeans, SQLeo, Open Office Base, Libre Office Base, Squirrell) to read/write Microsoft Access database. Because it is a pure java implementation it run in both Windows and non-Windows Operative Systems (e.g., linux/unix). No ODBC needed.
StelsMDB is not as expensive as HXTT, still not open source...
http://www.csv-jdbc.com/stels_mdb_jdbc.htm
Have'n tried it, but evaluation copy is available.
Anyone else got suggestions? I'm looking for an opensource variant myself. Shouldn't be impossible to build on top of jaccess ...
We use stelsMDB JDBC driver at our server to read/write MDB files. It is platform-independent, so you can use it in MacOS as well.
I'm looking for a way to open an Access MDB file inside a Java App (using JDBC).
A quick Google Search suggests that I need the JDBC-ODBC Bridge for this...
Does this mean that I need to configure every system I want to run my app on to provide a ODBC DSN for the MDB I want to open?
And one more question (since I've never used ODBC before): will the communication happen over some sort of a socket (in a client/server-style), or through method/function calls (like with an embeded Derby db)?
1) You won't need to configure every system with a SYSTEM or USER ODBC DSN to access the MDB you want. You can still provide all the information you need in your JDBC URL:
jdbc:odbc:Driver={Microsoft Access Driver (*.mdb)};DBQ=c:/yourdb.mdb
But keep in mind that the system will need to have the driver you are using installed.
2) The communication will happen the way your ODBC driver communicates. If it opens a socket to the server (the way an Oracle ODBC connection takes place) it will open a socket. If it uses library function calls, it will communicate through library function calls.
JDBC to ODBC communication uses JNI to communicate.