Database related

Some things that I need to work on, related to Database.
These code is used only to solve my needs, not suitable for production.

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1. Print data of a table

     private static void printTableDetails() {
       String tableName = "Student";
       Connection con=null;
       try {
         Class.forName("com.vertica.jdbc.Driver");  
         
         Properties props = new Properties();
         props.put("user", "xxx");
               props.put("password", "xxx");
         
         con=DriverManager.getConnection("jdbc:xxx://host:port/",props); 
         
         System.out.println("### Metadata of table : " + tableName);
         
         DatabaseMetaData databaseMetaData = con.getMetaData();
         ResultSet columns = databaseMetaData.getColumns(null,null, tableName, null);
         int count = 1;
         
         Statement stmt = con.createStatement();
         ResultSet rs = stmt.executeQuery("select * from " + tableName);
         ResultSetMetaData rsmd = rs.getMetaData();
         
         List columnNames = new ArrayList();
         while(columns.next()) {
             String columnName = columns.getString("COLUMN_NAME");
             columnNames.add(columnName);
             String columnSize = columns.getString("COLUMN_SIZE");
             String datatype = columns.getString("DATA_TYPE");
             String isNullable = columns.getString("IS_NULLABLE");
             String isAutoIncrement = columns.getString("IS_AUTOINCREMENT");
             
             String column_type_name = rsmd.getColumnTypeName(count);
             ++count;
             
             System.out.println("Column Name : " + columnName + ", \tData Type : " + column_type_name);
         }
         
         System.out.println("--------");
         ResultSet rs1 = stmt.executeQuery("Select * from " + tableName);
         
         System.out.println("Data of table : " + tableName);
         // Print column names
         for(String colName : columnNames) {
           System.out.print(colName + " \t\t");
         }
         System.out.println("");
             
         // Print table data
         while(rs1.next()) {  
           for(String colName : columnNames) {
             System.out.print(rs1.getString(colName) + " \t\t");
           }
           System.out.println("");
         }
       }
       catch(Exception e) {
         e.printStackTrace();
       }
       finally {
         if(con != null) {
           try {
             con.close();
           } catch(Exception ex) {}
         }
       }
     }