Package org.jfree.data

Class JDBCXYDataset

java.lang.Object
org.jfree.data.AbstractDataset
org.jfree.data.AbstractSeriesDataset
org.jfree.data.AbstractXYDataset
org.jfree.data.JDBCXYDataset
All Implemented Interfaces:
ObjectInputValidation, Serializable, Cloneable, EventListener, Dataset, RangeInfo, SeriesChangeListener, SeriesDataset, TableXYDataset, XYDataset
public class JDBCXYDataset
extends AbstractXYDataset
implements XYDataset, TableXYDataset, RangeInfo
This class provides an XYDataset implementation over a database JDBC result set. The dataset is populated via a call to executeQuery with the string sql query. The sql query must return at least two columns. The first column will be the x-axis and remaining columns y-axis values. executeQuery can be called a number of times. The database connection is read-only and no write back facility exists.
See Also:
Serialized Form

  • Constructor Details

    • JDBCXYDataset

      public JDBCXYDataset​(String url, String driverName, String user, String password) throws SQLException, ClassNotFoundException
      Creates a new dataset (initially empty) and establishes a new database connection.
      Parameters:
      url - URL of the database connection.
      driverName - the database driver class name.
      user - the database user.
      password - the database user's password.
      Throws:
      ClassNotFoundException - if the driver cannot be found.
      SQLException - if there is a problem connecting to the database.

    • JDBCXYDataset

      public JDBCXYDataset​(Connection con) throws SQLException
      Creates a new dataset (initially empty) using the specified database connection.
      Parameters:
      con - the database connection.
      Throws:
      SQLException - if there is a problem connecting to the database.

    • JDBCXYDataset

      public JDBCXYDataset​(Connection con, String query) throws SQLException
      Creates a new dataset using the specified database connection, and populates it using data obtained with the supplied query.
      Parameters:
      con - the connection.
      query - the SQL query.
      Throws:
      SQLException - if there is a problem executing the query.

  • Method Details

    • isTimeSeries

      public boolean isTimeSeries()
      Returns true if the dataset represents time series data, and false otherwise.
      Returns:
      a boolean.

    • setTimeSeries

      public void setTimeSeries​(boolean timeSeries)
      Sets a flag that indicates whether or not the data represents a time series.
      Parameters:
      timeSeries - the new value of the flag.

    • executeQuery

      public void executeQuery​(String query) throws SQLException
      ExecuteQuery will attempt execute the query passed to it against the existing database connection. If no connection exists then no action is taken. The results from the query are extracted and cached locally, thus applying an upper limit on how many rows can be retrieved successfully.
      Parameters:
      query - the query to be executed.
      Throws:
      SQLException - if there is a problem executing the query.

    • executeQuery

      public void executeQuery​(Connection con, String query) throws SQLException
      ExecuteQuery will attempt execute the query passed to it against the provided database connection. If connection is null then no action is taken The results from the query are extracted and cached locally, thus applying an upper limit on how many rows can be retrieved successfully.
      Parameters:
      query - the query to be executed.
      con - the connection the query is to be executed against.
      Throws:
      SQLException - if there is a problem executing the query.

    • getXValue

      public Number getXValue​(int seriesIndex, int itemIndex)
      Returns the x-value for the specified series and item. The implementation is responsible for ensuring that the x-values are presented in ascending order.
      Specified by:
      getXValue in interface XYDataset
      Parameters:
      seriesIndex - The series (zero-based index).
      itemIndex - The item (zero-based index).
      Returns:
      The x-value
      See Also:
      XYDataset

    • getYValue

      public Number getYValue​(int seriesIndex, int itemIndex)
      Returns the y-value for the specified series and item.
      Specified by:
      getYValue in interface XYDataset
      Parameters:
      seriesIndex - The series (zero-based index).
      itemIndex - The item (zero-based index).
      Returns:
      The yValue value
      See Also:
      XYDataset

    • getItemCount

      public int getItemCount​(int seriesIndex)
      Returns the number of items in the specified series.
      Specified by:
      getItemCount in interface XYDataset
      Parameters:
      seriesIndex - The series (zero-based index).
      Returns:
      The itemCount value
      See Also:
      XYDataset

    • getItemCount

      public int getItemCount()
      Returns the number of items in all series. This method is defined by the TableXYDataset interface.
      Specified by:
      getItemCount in interface TableXYDataset
      Returns:
      The item count.

    • getSeriesCount

      public int getSeriesCount()
      Returns the number of series in the dataset.
      Specified by:
      getSeriesCount in interface SeriesDataset
      Specified by:
      getSeriesCount in class AbstractSeriesDataset
      Returns:
      The seriesCount value
      See Also:
      XYDataset, Dataset

    • getSeriesName

      public String getSeriesName​(int seriesIndex)
      Returns the name of the specified series.
      Specified by:
      getSeriesName in interface SeriesDataset
      Specified by:
      getSeriesName in class AbstractSeriesDataset
      Parameters:
      seriesIndex - The series (zero-based index).
      Returns:
      The seriesName value
      See Also:
      XYDataset, Dataset

    • getLegendItemCount

      public int getLegendItemCount()
      Returns the number of items that should be displayed in the legend.
      Returns:
      The legendItemCount value

    • getLegendItemLabels

      public String[] getLegendItemLabels()
      Returns the legend item labels.
      Returns:
      The legend item labels.

    • getMinimumRangeValue

      public Number getMinimumRangeValue()
      Returns the minimum data value in the dataset's range.
      Specified by:
      getMinimumRangeValue in interface RangeInfo
      Returns:
      The minimum value.
      See Also:
      RangeInfo

    • getMaximumRangeValue

      public Number getMaximumRangeValue()
      Returns the maximum data value in the dataset's range.
      Specified by:
      getMaximumRangeValue in interface RangeInfo
      Returns:
      The maximum value.
      See Also:
      RangeInfo

    • close

      public void close()
      Close the database connection

    • getValueRange

      public Range getValueRange()
      Returns the range of the values in this dataset's range (y-values).
      Specified by:
      getValueRange in interface RangeInfo
      Returns:
      The range.