Package weka.gui.sql

Class ResultSetHelper

  • public class ResultSetHelper
extends java.lang.Object
    Represents an extended JTable, containing a table model based on a ResultSet and the corresponding query.
    Version:
    $Revision: 7043 $
    Author:
    FracPete (fracpete at waikato dot ac dot nz)

    • Constructor Summary

      Constructors 
      Constructor Description
      ResultSetHelper​(java.sql.ResultSet rs)
      initializes the helper, with unlimited number of rows.
      ResultSetHelper​(java.sql.ResultSet rs, int max)
      initializes the helper, with the given maximum number of rows (less than 1 means unlimited).

    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      java.lang.Object[][] getCells()
      returns an 2-dimensional array with the content of the resultset, the first dimension is the row, the second the column (i.e., getCells()[y][x]).
      java.lang.Class[] getColumnClasses()
      returns the classes for the columns.
      int getColumnCount()
      returns the number of columns in the resultset.
      java.lang.String[] getColumnNames()
      returns an array with the names of the columns in the resultset.
      int getMaxRows()
      the maximum number of rows to retrieve, less than 1 means unlimited.
      boolean[] getNumericColumns()
      returns an array that indicates whether a column is numeric or nor.
      java.sql.ResultSet getResultSet()
      the underlying resultset.
      int getRowCount()
      returns the number of rows in the resultset.
      boolean hasMaxRows()
      whether a limit on the rows to retrieve was set.
      static boolean typeIsNumeric​(int type)
      returns whether the SQL type is numeric (and therefore the justification should be right).
      static java.lang.Class typeToClass​(int type)
      Returns the class associated with a SQL type.

      • Methods inherited from class java.lang.Object

        equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Constructor Detail

      • ResultSetHelper

        public ResultSetHelper​(java.sql.ResultSet rs)
        initializes the helper, with unlimited number of rows.
        Parameters:
        rs - the resultset to work on

      • ResultSetHelper

        public ResultSetHelper​(java.sql.ResultSet rs,
                       int max)
        initializes the helper, with the given maximum number of rows (less than 1 means unlimited).
        Parameters:
        rs - the resultset to work on
        max - the maximum number of rows to retrieve

    • Method Detail

      • getResultSet

        public java.sql.ResultSet getResultSet()
        the underlying resultset.
        Returns:
        the resultset

      • getColumnCount

        public int getColumnCount()
        returns the number of columns in the resultset.
        Returns:
        the number of columns

      • getRowCount

        public int getRowCount()
        returns the number of rows in the resultset. If -1 then the number of rows couldn't be determined, i.e., the cursors aren't scrollable.
        Returns:
        the number of rows, -1 if it wasn't possible to determine

      • getColumnNames

        public java.lang.String[] getColumnNames()
        returns an array with the names of the columns in the resultset.
        Returns:
        the column names

      • getNumericColumns

        public boolean[] getNumericColumns()
        returns an array that indicates whether a column is numeric or nor.
        Returns:
        the numeric columns

      • getColumnClasses

        public java.lang.Class[] getColumnClasses()
        returns the classes for the columns.
        Returns:
        the column classes

      • hasMaxRows

        public boolean hasMaxRows()
        whether a limit on the rows to retrieve was set.
        Returns:
        true if there's a limit

      • getMaxRows

        public int getMaxRows()
        the maximum number of rows to retrieve, less than 1 means unlimited.
        Returns:
        the maximum number of rows

      • getCells

        public java.lang.Object[][] getCells()
        returns an 2-dimensional array with the content of the resultset, the first dimension is the row, the second the column (i.e., getCells()[y][x]). Note: the data is not cached! It is always retrieved anew.
        Returns:
        the data

      • typeToClass

        public static java.lang.Class typeToClass​(int type)
        Returns the class associated with a SQL type.
        Parameters:
        type - the SQL type
        Returns:
        the Java class corresponding with the type

      • typeIsNumeric

        public static boolean typeIsNumeric​(int type)
        returns whether the SQL type is numeric (and therefore the justification should be right).
        Parameters:
        type - the SQL type
        Returns:
        whether the given type is numeric