How to count number of tables in a db using java?

[erdomester]

Hi all!
I have several tables in an MsAccess db and I would like to read all data of a certain column to a Hashmap. With 3 tables and using static array, it' working but i have about 300 tables.
With the static array, I used sg like this:

id=1;
int array[] = {206,260,91}; //names of 3 tables
    for (int i=0; i<3; i++) 
    {
      int tables = array[i];
      String sql = "SELECT * FROM "+tables+"";
      try
     {
           PreparedStatement stat = con.prepareStatement (sql);
           ResultSet rs = stat.executeQuery (); 
           Statement stmt2 = con.createStatement();

       if (rs != null) 
       {                
           while (rs.next())
           {
              station = rs.getString("STATIONS");
               boolean blnExists = hMap.containsValue(station);
              
               if (blnExists == true) 
               {
                  System.out.println("Already exists " + station + ": " + blnExists);     
               }
               else
               {
                  hMap.put(id, station);
                  String sql_out = "INSERT INTO Stations_All(ID_STATION, STATION) VALUES(" + id + ", '" + station + "')";
                  stmt2.executeUpdate(sql_out);
                  id++;
                  System.out.println(hMap.values());
               }
            }
          } 
       }
   }

So this puts the stations of the 3 tables into both a hashmap and a new database(Stations_All). But what happens if I have several databases especially when the number of tables occasionally change? I haven't found a solution. I believe with the method number of tables should be determined and then somehow read all tables.
Any help is appreciated.

[Ezzaral]

You can use the following query to get a list of the non-system tables

select name from MSysObjects where type=1 and flags=0

[erdomester]

How to use this? I set everything in access to have all the rights on sysobjects.

String sql_count = "select count(name) from MSysObjects where type=1 and flags=0";
     try {
         PreparedStatement st = con.prepareStatement (sql_count);
         ResultSet rsst = st.executeQuery();
         Statement stst = con.createStatement();
         if (rsst != null) {
             while (rsst.next()) {
                 stst.executeUpdate(sql_count);
             }
         }

This gives this msg: No row count was produced
What is wrong with my code? And i'd like to have the number of tables written out...

[masijade]

Don't do it that way. That is Database specific. Read the API docs for DatabaseMetaData.

[blackcompe]

Connection c;
ResultSet rs = c.getMetaData().getTables(catalog, schemaPattern, tableNamePattern, types);
while(rs.next())
{
//rs.getString("<column for table names>");
}

[erdomester]

This looks like similar to what i found:

DatabaseMetaData dbmd = con.getMetaData();
      String[] types = {"TABLE"};   // Specify the type of object; in this case we want tables
      ResultSet resultSet = dbmd.getTables(null, null, "%", types);
     // Get the table names
        while (resultSet.next()) 
      {  
          String tableName = resultSet.getString(3);   // Get the table name
          String tableCatalog = resultSet.getString(1);  // Get the table's catalog and schema names (if any)
          String tableSchema = resultSet.getString(2);
}

Thank u all for the help.