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## org.jfree.data.jdbc
Class JDBCCategoryDataset

    java.lang.Object
      org.jfree.data.general.AbstractDataset
          org.jfree.data.category.DefaultCategoryDataset
              org.jfree.data.jdbc.JDBCCategoryDataset

All Implemented Interfaces:
  java.io.ObjectInputValidation, java.io.Serializable, java.lang.Cloneable, CategoryDataset, Dataset, KeyedValues2D, Values2D

    public class JDBCCategoryDataset

extends DefaultCategoryDataset

A `CategoryDataset` implementation over a database JDBC result set. The dataset is populated via a call to `executeQuery(String)` with the string SQL query. The SQL query must return at least two columns. The first column will be the category name and remaining columns values (each column represents a series). Subsequent calls to `executeQuery(String)` will refresh the dataset.

The database connection is read-only and no write back facility exists.

NOTE: Many people have found this class too restrictive in general use. For the greatest flexibility, please consider writing your own code to read data from a `ResultSet` and populate a `DefaultCategoryDataset` directly.

See Also:
  Serialized Form

Constructor Summary
`JDBCCategoryDataset(java.sql.Connection connection)` Create a new dataset with the given database connection.
`JDBCCategoryDataset(java.sql.Connection connection, java.lang.String query)` Creates a new dataset with the given database connection, and executes the supplied query to populate the dataset.
`JDBCCategoryDataset(java.lang.String url, java.lang.String driverName, java.lang.String user, java.lang.String passwd)` Creates a new dataset with a database connection.

Method Summary
`void` | `executeQuery(java.sql.Connection con, java.lang.String query)` Populates the dataset by executing the supplied query against the existing database connection.
`void` | `executeQuery(java.lang.String query)` Populates the dataset by executing the supplied query against the existing database connection.
`boolean` | `getTranspose()` Returns a flag that controls whether or not the table values are transposed when added to the dataset.
`void` | `setTranspose(boolean transpose)` Sets a flag that controls whether or not the table values are transposed when added to the dataset.

Methods inherited from class org.jfree.data.category.DefaultCategoryDataset
`addValue, addValue, clear, clone, equals, getColumnCount, getColumnIndex, getColumnKey, getColumnKeys, getRowCount, getRowIndex, getRowKey, getRowKeys, getValue, getValue, hashCode, incrementValue, removeColumn, removeColumn, removeRow, removeRow, removeValue, setValue, setValue`

Methods inherited from class org.jfree.data.general.AbstractDataset
`addChangeListener, fireDatasetChanged, getGroup, hasListener, notifyListeners, removeChangeListener, setGroup, validateObject`

Methods inherited from class java.lang.Object
`finalize, getClass, notify, notifyAll, toString, wait, wait, wait`

Methods inherited from interface org.jfree.data.general.Dataset
`addChangeListener, getGroup, removeChangeListener, setGroup`

Constructor Detail

### JDBCCategoryDataset

    public JDBCCategoryDataset(java.lang.String url,
                               java.lang.String driverName,
                               java.lang.String user,
                               java.lang.String passwd)
                        throws java.lang.ClassNotFoundException,
                               java.sql.SQLException

  Creates a new dataset with a database connection.

  Parameters:
    `url` - the URL of the database connection.
    `driverName` - the database driver class name.
    `user` - the database user.
    `passwd` - the database user's password.
  Throws:
    `java.lang.ClassNotFoundException` - if the driver cannot be found.
    `java.sql.SQLException` - if there is an error obtaining a connection to the database.

### JDBCCategoryDataset

    public JDBCCategoryDataset(java.sql.Connection connection)

  Create a new dataset with the given database connection.

  Parameters:
    `connection` - the database connection.

### JDBCCategoryDataset

    public JDBCCategoryDataset(java.sql.Connection connection,
                               java.lang.String query)
                        throws java.sql.SQLException

  Creates a new dataset with the given database connection, and executes the supplied query to populate the dataset.

  Parameters:
    `connection` - the connection.
    `query` - the query.
  Throws:
    `java.sql.SQLException` - if there is a problem executing the query.

Method Detail

### getTranspose

    public boolean getTranspose()

  Returns a flag that controls whether or not the table values are transposed when added to the dataset.

  Returns:
    A boolean.

### setTranspose

    public void setTranspose(boolean transpose)

  Sets a flag that controls whether or not the table values are transposed when added to the dataset.

  Parameters:
    `transpose` - the flag.

### executeQuery

    public void executeQuery(java.lang.String query)
                      throws java.sql.SQLException

  Populates the dataset by executing the supplied query 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.
  Throws:
    `java.sql.SQLException` - if there is a problem executing the query.

### executeQuery

    public void executeQuery(java.sql.Connection con,
                             java.lang.String query)
                      throws java.sql.SQLException

  Populates the dataset by executing the supplied query 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:
    `con` - the connection.
    `query` - the query.
  Throws:
    `java.sql.SQLException` - if there is a problem executing the query.

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