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getting the path of an ODBC database

Posted on 2002-03-26
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Last Modified: 2010-03-31
All,

Please can anyone tell me how to get the full pathname of an existing ODBC database.

I have the ODBC name, but can't seem to find the appropriate class to get the actually database path in which the ODBC is pointing to.

Thanks in advance.
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Question by:Cuong
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9 Comments
 
LVL 3

Expert Comment

by:msterjev
ID: 6896186
You need to put jdbc:odbc in front of the ODBC name. For example, if you have registered Northwind database the exact path is:

jdbc:odbc:Nortwind
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Author Comment

by:Cuong
ID: 6896232
I tried doing this!

Maybe I should have mentioned, that I need to create a File object using the path.

I tried the following, and it doesn't seem to create the File

String DBName = "jdbc:odbc"+ODBCName;
File DBFile = new File(DBName);

DBFile.getAbsolutePath() returns jdbc:odbc+ODBCName



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LVL 3

Expert Comment

by:msterjev
ID: 6896765
Did you loaded the approapriate driver before connecting to the database?You must type this:

Class.forName("sun.jdbc.odbc.JdbcOdbcDriver")
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Author Comment

by:Cuong
ID: 6896873
Yes.

I have adatabase class, and I make a connection in the constructor.

It is from this Database object, that i need to get the path in which the Database is pointing at.

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Accepted Solution

by:
msterjev earned 100 total points
ID: 6898852
OK. You need some JNI code. Write this class:

public class JODBCInfo
{
     static
     {
          System.loadLibrary("JODBCInfo");
     }
     
     public static native String getDatabasePath(String dbName);
}

Then generate header file with:

javah JODBCInfo

Then start C++ and make new Win32Dll project.

The JNI code is as follows:

#include "JODBCInfo.h"
#include <windows.h>

JNIEXPORT jstring JNICALL Java_JODBCInfo_getDatabasePath(JNIEnv * env, jclass c, jstring dbName)
{
     
     HKEY hKey;
     long ret;
     char dbPath[MAX_PATH];
     DWORD cbDbPath=MAX_PATH;
     DWORD lType;
     char regKey[100];
     jstring path=NULL;
     const char *db = env->GetStringUTFChars(dbName, 0);
     lstrcpy(regKey,"Software\\ODBC\\ODBC.INI\\");
     lstrcat(regKey,db);
      ret=RegOpenKeyEx(HKEY_LOCAL_MACHINE,regKey,0,KEY_QUERY_VALUE,&hKey);
     if(ret==ERROR_SUCCESS)
     {
          ret=RegQueryValueEx(hKey,"DBQ",NULL,&lType,(unsigned char *)dbPath,&cbDbPath);
          if(ret==ERROR_SUCCESS)
          {
               path=env->NewStringUTF(dbPath);
          }
          RegCloseKey(hKey);
     }
     env->ReleaseStringUTFChars(dbName,db);
     return path;
}

Put the generated JODBCInfo.dll in the same directory with the JODBCInfo class.

Test this:

public class Test
{
     public static void main(String[] args)
     {
          System.out.println(JODBCInfo.getDatabasePath("Northwind"));
     }
}


I think the result is exactly what do you want to achieve. If you are not coding  with JNI, don't be afraid, the code is short and complete!The task can only be done this way!
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LVL 3

Expert Comment

by:msterjev
ID: 6901792
It seems you are not willing to give me the points!The proposed solutions works fine and is definitelly what you are looking for!
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LVL 3

Expert Comment

by:msterjev
ID: 6904588
The points ;-)
0
 
LVL 3

Expert Comment

by:msterjev
ID: 6909725
I really don't know what is wrong with the above solution. I wrote this JNI code only for you, and I think it is worth a little price!
0
 

Author Comment

by:Cuong
ID: 6912305
Thanks!

I only gave average cause it's not the type of solution i was looking for.  I.e. the time to implement the solution did not warrent the problem.

I haven't actually tried it yet, but I'll take your word that it works.
0

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