weka.gui.sql

## Class ResultSetHelper

- java.lang.Object
- - weka.gui.sql.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: 11247 $
  Author:
    FracPete (fracpete at waikato dot ac dot nz)

- - ### Constructor Summary

    Constructors
    Constructor and 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

    Methods
    Modifier and Type | Method and 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