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java.lang.Objectorg.jfree.data.AbstractDataset
org.jfree.data.DefaultPieDataset
org.jfree.data.JDBCPieDataset
A PieDataset that reads data from a database via JDBC.
A query should be supplied that returns data in two columns, the first containing VARCHAR data, and the second containing numerical data. The data is cached in-memory and can be refreshed at any time.
| Constructor Summary | |
JDBCPieDataset(java.sql.Connection con)
Creates a new JDBCPieDataset using a pre-existing database connection. |
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JDBCPieDataset(java.sql.Connection con,
java.lang.String query)
Creates a new JDBCPieDataset using a pre-existing database connection. |
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JDBCPieDataset(java.lang.String url,
java.lang.String driverName,
java.lang.String user,
java.lang.String password)
Creates a new JDBCPieDataset and establishes a new database connection. |
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| Method Summary | |
void |
close()
Close the database connection |
void |
executeQuery(java.sql.Connection con,
java.lang.String query)
ExecuteQuery will attempt execute the query passed to it against the existing database connection. |
void |
executeQuery(java.lang.String query)
ExecuteQuery will attempt execute the query passed to it against the existing database connection. |
| Methods inherited from class org.jfree.data.DefaultPieDataset |
clone, equals, getIndex, getItemCount, getKey, getKeys, getValue, getValue, hashCode, setValue, setValue |
| Methods inherited from class org.jfree.data.AbstractDataset |
addChangeListener, fireDatasetChanged, getGroup, 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.Dataset |
addChangeListener, getGroup, removeChangeListener, setGroup |
| Constructor Detail |
public JDBCPieDataset(java.lang.String url,
java.lang.String driverName,
java.lang.String user,
java.lang.String password)
throws java.sql.SQLException,
java.lang.ClassNotFoundException
url - the URL of the database connection.driverName - the database driver class name.user - the database user.password - the database users password.
java.lang.ClassNotFoundException - if the driver cannot be found.
java.sql.SQLException - if there is a problem obtaining a database connection.public JDBCPieDataset(java.sql.Connection con)
The dataset is initially empty, since no query has been supplied yet.
con - the database connection.
public JDBCPieDataset(java.sql.Connection con,
java.lang.String query)
throws java.sql.SQLException
The dataset is initialised with the supplied query.
con - the database connection.query - the database connection.
java.sql.SQLException - if there is a problem executing the query.| Method Detail |
public void executeQuery(java.lang.String query)
throws java.sql.SQLException
query - the query to be executed.
java.sql.SQLException - if there is a problem executing the query.
public void executeQuery(java.sql.Connection con,
java.lang.String query)
throws java.sql.SQLException
query - the query to be executedcon - the connection the query is to be executed against
java.sql.SQLException - if there is a problem executing the query.public void close()
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