Module org.hsqldb
Package org.hsqldb.jdbc

Class JDBCPool

  • All Implemented Interfaces:
    java.sql.Wrapper, java.util.EventListener, javax.naming.Referenceable, javax.sql.CommonDataSource, javax.sql.ConnectionEventListener, javax.sql.DataSource, javax.sql.StatementEventListener
    public class JDBCPool
extends java.lang.Object
implements javax.sql.DataSource, javax.naming.Referenceable, javax.sql.ConnectionEventListener, javax.sql.StatementEventListener, java.sql.Wrapper
    A fast connection pool.

    HSQLDB-Specific Information:

    A connection pool for HyperSQL connections. This implementation of DataSource is dedicated to HyperSQL and guarantees all connection states are automatically reset when a connection is reused.

    The methods of the parent class, JDBCCommonDataSource are used to specify the database URL, user, password, and / or connection properties.

    Since:
    HSQLDB 2.2.9
    Author:
    Fred Toussi (fredt@users dot sourceforge.net)

    • Constructor Summary

      Constructors 
      Constructor Description
      JDBCPool()
      Creates a connection pool with the maximum size of 8.
      JDBCPool​(int size)
      Creates a connection pool with the given maximum size.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void close​(int wait)
      Closes the pool immediately.
      void connectionClosed​(javax.sql.ConnectionEvent event)  
      void connectionErrorOccurred​(javax.sql.ConnectionEvent event)  
      java.sql.Connection getConnection()
      Retrieves a new connection using the properties that have already been set.
      java.sql.Connection getConnection​(java.lang.String username, java.lang.String password)
      Retrieves a new connection using the given username and password, and the database url that has been set.
      java.lang.String getDatabase()
      Synonym for getUrl().
      java.lang.String getDatabaseName()
      Synonym for getUrl().
      java.lang.String getDataSourceName()
      Retrieves the name of the data source.
      java.lang.String getDescription()
      Retrieves the description of the data source.
      int getLoginTimeout()
      Gets the maximum time in seconds that this data source can wait while attempting to connect to a database.
      java.io.PrintWriter getLogWriter()
      Retrieves the log writer for this DataSource object.
      java.util.logging.Logger getParentLogger()
      Return the parent Logger of all the Loggers used by this data source.
      javax.naming.Reference getReference()
      Retrieves the Reference of this object.
      java.lang.String getUrl()
      Retrieves the jdbc database connection url attribute.
      java.lang.String getURL()
      Retrieves the jdbc database connection url attribute.
      java.lang.String getUser()
      Retrieves the user name for the connection.
      boolean isWrapperFor​(java.lang.Class<?> iface)
      Returns true if this either implements the interface argument or is directly or indirectly a wrapper for an object that does.
      void setDatabase​(java.lang.String database)
      Synonym for setUrl(String).
      void setDatabaseName​(java.lang.String databaseName)
      Synonym for setUrl(String).
      void setLoginTimeout​(int seconds)
      Sets the maximum time in seconds that this data source will wait while attempting to connect to a database.
      void setLogWriter​(java.io.PrintWriter out)
      Sets the log writer for this DataSource object to the given java.io.PrintWriter object.
      void setPassword​(java.lang.String password)
      Sets the password for the username.
      void setProperties​(java.util.Properties props)
      Sets connection properties.
      void setUrl​(java.lang.String url)
      Sets the jdbc database URL.
      void setURL​(java.lang.String url)
      Sets the jdbc database URL.
      void setUser​(java.lang.String user)
      Sets the user name.
      void statementClosed​(javax.sql.StatementEvent event)  
      void statementErrorOccurred​(javax.sql.StatementEvent event)  
      <T> T unwrap​(java.lang.Class<T> iface)
      Returns an object that implements the given interface to allow access to non-standard methods, or standard methods not exposed by the proxy.

      • Methods inherited from class java.lang.Object

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

      • Methods inherited from interface javax.sql.CommonDataSource

        createShardingKeyBuilder

      • Methods inherited from interface javax.sql.DataSource

        createConnectionBuilder

    • Constructor Detail

      • JDBCPool

        public JDBCPool()
        Creates a connection pool with the maximum size of 8. The database and connection settings are made before the getConnection() is called.

      • JDBCPool

        public JDBCPool​(int size)
        Creates a connection pool with the given maximum size. The database and connection settings are made before the getConnection() is called.
        Parameters:
        size - int maximum size of the pool

    • Method Detail

      • getConnection

        public java.sql.Connection getConnection()
                                  throws java.sql.SQLException
        Retrieves a new connection using the properties that have already been set.
        Specified by:
        getConnection in interface javax.sql.DataSource
        Returns:
        a connection to the data source
        Throws:
        java.sql.SQLException - if a database access error occurs

      • getConnection

        public java.sql.Connection getConnection​(java.lang.String username,
                                         java.lang.String password)
                                  throws java.sql.SQLException
        Retrieves a new connection using the given username and password, and the database url that has been set. No other properties are used for the connection. This method can be used only with the same username and password used for the connection pool. The first call to this method sets the user name and password for the connection pool.
        Specified by:
        getConnection in interface javax.sql.DataSource
        Parameters:
        username - the database user on whose behalf the connection is being made
        password - the user's password
        Returns:
        a connection to the data source
        Throws:
        java.sql.SQLException - if a database access error occurs

      • unwrap

        public <T> T unwrap​(java.lang.Class<T> iface)
             throws java.sql.SQLException
        Returns an object that implements the given interface to allow access to non-standard methods, or standard methods not exposed by the proxy. If the receiver implements the interface then the result is the receiver or a proxy for the receiver. If the receiver is a wrapper and the wrapped object implements the interface then the result is the wrapped object or a proxy for the wrapped object. Otherwise return the result of calling unwrap recursively on the wrapped object or a proxy for that result. If the receiver is not a wrapper and does not implement the interface, then an SQLException is thrown.
        Specified by:
        unwrap in interface java.sql.Wrapper
        Parameters:
        iface - A Class defining an interface that the result must implement.
        Returns:
        an object that implements the interface. May be a proxy for the actual implementing object.
        Throws:
        java.sql.SQLException - If no object found that implements the interface
        Since:
        JDK 1.6, HSQLDB 2.0

      • isWrapperFor

        public boolean isWrapperFor​(java.lang.Class<?> iface)
                     throws java.sql.SQLException
        Returns true if this either implements the interface argument or is directly or indirectly a wrapper for an object that does. Returns false otherwise. If this implements the interface then return true, else if this is a wrapper then return the result of recursively calling isWrapperFor on the wrapped object. If this does not implement the interface and is not a wrapper, return false. This method should be implemented as a low-cost operation compared to unwrap so that callers can use this method to avoid expensive unwrap calls that may fail. If this method returns true then calling unwrap with the same argument should succeed.
        Specified by:
        isWrapperFor in interface java.sql.Wrapper
        Parameters:
        iface - a Class defining an interface.
        Returns:
        true if this implements the interface or directly or indirectly wraps an object that does.
        Throws:
        java.sql.SQLException - if an error occurs while determining whether this is a wrapper for an object with the given interface.
        Since:
        JDK 1.6, HSQLDB 2.0

      • getReference

        public javax.naming.Reference getReference()
                                    throws javax.naming.NamingException
        Retrieves the Reference of this object.
        Specified by:
        getReference in interface javax.naming.Referenceable
        Returns:
        The non-null Reference of this object.
        Throws:
        javax.naming.NamingException - If a naming exception was encountered while retrieving the reference.

      • connectionClosed

        public void connectionClosed​(javax.sql.ConnectionEvent event)
        Specified by:
        connectionClosed in interface javax.sql.ConnectionEventListener

      • connectionErrorOccurred

        public void connectionErrorOccurred​(javax.sql.ConnectionEvent event)
        Specified by:
        connectionErrorOccurred in interface javax.sql.ConnectionEventListener

      • statementClosed

        public void statementClosed​(javax.sql.StatementEvent event)
        Specified by:
        statementClosed in interface javax.sql.StatementEventListener

      • statementErrorOccurred

        public void statementErrorOccurred​(javax.sql.StatementEvent event)
        Specified by:
        statementErrorOccurred in interface javax.sql.StatementEventListener

      • getLogWriter

        public java.io.PrintWriter getLogWriter()
                                 throws java.sql.SQLException

        Retrieves the log writer for this DataSource object.

        The log writer is a character output stream to which all logging and tracing messages for this data source will be printed. This includes messages printed by the methods of this object, messages printed by methods of other objects manufactured by this object, and so on. Messages printed to a data source specific log writer are not printed to the log writer associated with the java.sql.DriverManager class. When a DataSource object is created, the log writer is initially null; in other words, the default is for logging to be disabled.

        Specified by:
        getLogWriter in interface javax.sql.CommonDataSource
        Specified by:
        getLogWriter in interface javax.sql.DataSource
        Returns:
        the log writer for this data source or null if logging is disabled
        Throws:
        java.sql.SQLException - if a database access error occurs
        Since:
        1.4
        See Also:
        setLogWriter(java.io.PrintWriter)

      • setLogWriter

        public void setLogWriter​(java.io.PrintWriter out)
                  throws java.sql.SQLException

        Sets the log writer for this DataSource object to the given java.io.PrintWriter object.

        The log writer is a character output stream to which all logging and tracing messages for this data source will be printed. This includes messages printed by the methods of this object, messages printed by methods of other objects manufactured by this object, and so on. Messages printed to a data source- specific log writer are not printed to the log writer associated with the java.sql.DriverManager class. When a DataSource object is created the log writer is initially null; in other words, the default is for logging to be disabled.

        Specified by:
        setLogWriter in interface javax.sql.CommonDataSource
        Specified by:
        setLogWriter in interface javax.sql.DataSource
        Parameters:
        out - the new log writer; to disable logging, set to null
        Throws:
        java.sql.SQLException - if a database access error occurs
        Since:
        1.4
        See Also:
        getLogWriter()

      • setLoginTimeout

        public void setLoginTimeout​(int seconds)
                     throws java.sql.SQLException

        Sets the maximum time in seconds that this data source will wait while attempting to connect to a database. A value of zero specifies that the timeout is the default system timeout if there is one; otherwise, it specifies that there is no timeout. When a DataSource object is created, the login timeout is initially zero.

        Specified by:
        setLoginTimeout in interface javax.sql.CommonDataSource
        Specified by:
        setLoginTimeout in interface javax.sql.DataSource
        Parameters:
        seconds - the data source login time limit
        Throws:
        java.sql.SQLException - if a database access error occurs.
        Since:
        1.4
        See Also:
        getLoginTimeout()

      • getLoginTimeout

        public int getLoginTimeout()
                    throws java.sql.SQLException
        Gets the maximum time in seconds that this data source can wait while attempting to connect to a database. A value of zero means that the timeout is the default system timeout if there is one; otherwise, it means that there is no timeout. When a DataSource object is created, the login timeout is initially zero.
        Specified by:
        getLoginTimeout in interface javax.sql.CommonDataSource
        Specified by:
        getLoginTimeout in interface javax.sql.DataSource
        Returns:
        the data source login time limit
        Throws:
        java.sql.SQLException - if a database access error occurs.
        Since:
        1.4
        See Also:
        setLoginTimeout(int)

      • getDescription

        public java.lang.String getDescription()
        Retrieves the description of the data source.
        Returns:
        the description

      • getDataSourceName

        public java.lang.String getDataSourceName()
        Retrieves the name of the data source.
        Returns:
        the description

      • getDatabaseName

        public java.lang.String getDatabaseName()
        Synonym for getUrl().
        Returns:
        the jdbc database connection url attribute

      • getDatabase

        public java.lang.String getDatabase()
        Synonym for getUrl().
        Returns:
        the jdbc database connection url attribute

      • getUrl

        public java.lang.String getUrl()
        Retrieves the jdbc database connection url attribute.
        Returns:
        the jdbc database connection url attribute

      • getURL

        public java.lang.String getURL()
        Retrieves the jdbc database connection url attribute.
        Returns:
        the jdbc database connection url attribute

      • getUser

        public java.lang.String getUser()
        Retrieves the user name for the connection.
        Returns:
        the username for the connection

      • setDatabaseName

        public void setDatabaseName​(java.lang.String databaseName)
        Synonym for setUrl(String).
        Parameters:
        databaseName - the new value for the attribute

      • setDatabase

        public void setDatabase​(java.lang.String database)
        Synonym for setUrl(String).
        Parameters:
        database - the new value for the attribute

      • setUrl

        public void setUrl​(java.lang.String url)
        Sets the jdbc database URL.
        Parameters:
        url - the new value of this object's jdbc database connection url attribute

      • setURL

        public void setURL​(java.lang.String url)
        Sets the jdbc database URL.
        Parameters:
        url - the new value of this object's jdbc database connection url attribute

      • setPassword

        public void setPassword​(java.lang.String password)
        Sets the password for the username.
        Parameters:
        password - the password

      • setUser

        public void setUser​(java.lang.String user)
        Sets the user name.
        Parameters:
        user - the user id

      • setProperties

        public void setProperties​(java.util.Properties props)
        Sets connection properties. If user / password / loginTimeout has been set with one of the setXXX() methods it will be added to the Properties object.
        Parameters:
        props - properties. If null, then existing properties will be cleared/replaced.

      • getParentLogger

        public java.util.logging.Logger getParentLogger()
                                         throws java.sql.SQLFeatureNotSupportedException
        Return the parent Logger of all the Loggers used by this data source. This should be the Logger farthest from the root Logger that is still an ancestor of all of the Loggers used by this data source. Configuring this Logger will affect all of the log messages generated by the data source. In the worst case, this may be the root Logger.
        Specified by:
        getParentLogger in interface javax.sql.CommonDataSource
        Returns:
        the parent Logger for this data source
        Throws:
        java.sql.SQLFeatureNotSupportedException - if the data source does not use java.util.logging.
        Since:
        JDK 1.7, HSQLDB 2.2.9

      • close

        public void close​(int wait)
           throws java.sql.SQLException
        Closes the pool immediately. Waits the given number of seconds before closing all existing connections in the pool.
        Parameters:
        wait - int number of seconds to wait before closing the connections, maximum 60 seconds
        Throws:
        java.sql.SQLException - on any error