import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.Statement;
import java.sql.SQLException;
import java.io.File;
import java.io.IOException;
import java.util.Scanner;

/**
   Executes all SQL statements from a file or the console.
*/
public class ExecSQL
{
   public static void main(String[] args) 
         throws SQLException, IOException, ClassNotFoundException
   {   
      if (args.length == 0)
      {   
         System.out.println(
               "Usage: java -classpath driver_class_path"
               + File.pathSeparator 
               + ". ExecSQL propertiesFile [SQLcommandFile]");
         return;
      }

      SimpleDataSource.init(args[0]);
      
      Scanner in; 
      if (args.length > 1) 
         in = new Scanner(new File(args[1]));
      else
         in = new Scanner(System.in);
      
      Connection conn = SimpleDataSource.getConnection();
      try
      {
         Statement stat = conn.createStatement();      
         while (in.hasNextLine())
         {
            String line = in.nextLine();
            try
            {
               boolean hasResultSet = stat.execute(line);
               if (hasResultSet)
               {
                  ResultSet result = stat.getResultSet();
                  showResultSet(result);
                  result.close();
               }
            }
            catch (SQLException ex)
            {
               System.out.println(ex);
            }
         }
      }
      finally
      {      
         conn.close();
      }
   }

   /**
      Prints a result set.
      @param result the result set
   */
   public static void showResultSet(ResultSet result) 
         throws SQLException
   { 
      ResultSetMetaData metaData = result.getMetaData();
      int columnCount = metaData.getColumnCount();

      for (int i = 1; i <= columnCount; i++)
      {  
         if (i > 1) System.out.print(", ");
         System.out.print(metaData.getColumnLabel(i));
      }
      System.out.println();

      while (result.next())
      {  
         for (int i = 1; i <= columnCount; i++)
         {  
            if (i > 1) System.out.print(", ");
            System.out.print(result.getString(i));
         }
         System.out.println();
      }
   }
}