JdbcConnectionPool

java.lang.Object
- org.h2.jdbcx.JdbcConnectionPool

All Implemented Interfaces:: java.sql.Wrapper, java.util.EventListener, javax.sql.CommonDataSource, javax.sql.ConnectionEventListener, javax.sql.DataSource, JdbcConnectionPoolBackwardsCompat

public final class JdbcConnectionPool
extends java.lang.Object
implements javax.sql.DataSource, javax.sql.ConnectionEventListener, JdbcConnectionPoolBackwardsCompat

A simple standalone JDBC connection pool. It is based on the MiniConnectionPoolManager written by Christian d'Heureuse (Java 1.5) . It is used as follows:

 import java.sql.*;
 import org.h2.jdbcx.JdbcConnectionPool;
 public class Test {
     public static void main(String... args) throws Exception {
         JdbcConnectionPool cp = JdbcConnectionPool.create(
             "jdbc:h2:~/test", "sa", "sa");
         for (String sql : args) {
             Connection conn = cp.getConnection();
             conn.createStatement().execute(sql);
             conn.close();
         }
         cp.dispose();
     }
 }

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`connectionClosed(javax.sql.ConnectionEvent event)` INTERNAL
`void`	`connectionErrorOccurred(javax.sql.ConnectionEvent event)` INTERNAL
`static JdbcConnectionPool`	`create(javax.sql.ConnectionPoolDataSource dataSource)` Constructs a new connection pool.
`static JdbcConnectionPool`	`create(java.lang.String url, java.lang.String user, java.lang.String password)` Constructs a new connection pool for H2 databases.
`void`	`dispose()` Closes all unused pooled connections.
`int`	`getActiveConnections()` Returns the number of active (open) connections of this pool.
`java.sql.Connection`	`getConnection()` Retrieves a connection from the connection pool.
`java.sql.Connection`	`getConnection(java.lang.String user, java.lang.String password)` INTERNAL
`int`	`getLoginTimeout()` Gets the maximum time in seconds to wait for a free connection.
`java.io.PrintWriter`	`getLogWriter()` INTERNAL
`int`	`getMaxConnections()` Gets the maximum number of connections to use.
`java.util.logging.Logger`	`getParentLogger()` [Not supported]
`boolean`	`isWrapperFor(java.lang.Class<?> iface)` Checks if unwrap can return an object of this class.
`void`	`setLoginTimeout(int seconds)` Sets the maximum time in seconds to wait for a free connection.
`void`	`setLogWriter(java.io.PrintWriter logWriter)` INTERNAL
`void`	`setMaxConnections(int max)` Sets the maximum number of connections to use from now on.
`<T> T`	`unwrap(java.lang.Class<T> iface)` Return an object of this class if possible.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - create
```
public static JdbcConnectionPool create(javax.sql.ConnectionPoolDataSource dataSource)
```
    Constructs a new connection pool.
    
    Parameters:
    
    dataSource - the data source to create connections
    
    Returns:
    
    the connection pool
  - create
```
public static JdbcConnectionPool create(java.lang.String url,
                                        java.lang.String user,
                                        java.lang.String password)
```
    Constructs a new connection pool for H2 databases.
    
    Parameters:
    
    url - the database URL of the H2 connection
    
    user - the user name
    
    password - the password
    
    Returns:
    
    the connection pool
  - setMaxConnections
```
public void setMaxConnections(int max)
```
    Sets the maximum number of connections to use from now on. The default value is 10 connections.
    
    Parameters:
    
    max - the maximum number of connections
  - getMaxConnections
```
public int getMaxConnections()
```
    Gets the maximum number of connections to use.
    
    Returns:
    
    the max the maximum number of connections
  - getLoginTimeout
```
public int getLoginTimeout()
```
    Gets the maximum time in seconds to wait for a free connection.
    
    Specified by:
    
    getLoginTimeout in interface javax.sql.CommonDataSource
    
    Returns:
    
    the timeout in seconds
  - setLoginTimeout
```
public void setLoginTimeout(int seconds)
```
    Sets the maximum time in seconds to wait for a free connection. The default timeout is 30 seconds. Calling this method with the value 0 will set the timeout to the default value.
    
    Specified by:
    
    setLoginTimeout in interface javax.sql.CommonDataSource
    
    Parameters:
    
    seconds - the timeout, 0 meaning the default
  - dispose
```
public void dispose()
```
    Closes all unused pooled connections. Exceptions while closing are written to the log stream (if set).
  - getConnection
```
public java.sql.Connection getConnection()
                                  throws java.sql.SQLException
```
    Retrieves a connection from the connection pool. If maxConnections connections are already in use, the method waits until a connection becomes available or timeout seconds elapsed. When the application is finished using the connection, it must close it in order to return it to the pool. If no connection becomes available within the given timeout, an exception with SQL state 08001 and vendor code 8001 is thrown.
    
    Specified by:
    
    getConnection in interface javax.sql.DataSource
    
    Returns:
    
    a new Connection object.
    
    Throws:
    
    java.sql.SQLException - when a new connection could not be established, or a timeout occurred
  - getConnection
```
public java.sql.Connection getConnection(java.lang.String user,
                                         java.lang.String password)
```
    INTERNAL
    
    Specified by:
    
    getConnection in interface javax.sql.DataSource
  - connectionClosed
```
public void connectionClosed(javax.sql.ConnectionEvent event)
```
    INTERNAL
    
    Specified by:
    
    connectionClosed in interface javax.sql.ConnectionEventListener
  - connectionErrorOccurred
```
public void connectionErrorOccurred(javax.sql.ConnectionEvent event)
```
    INTERNAL
    
    Specified by:
    
    connectionErrorOccurred in interface javax.sql.ConnectionEventListener
  - getActiveConnections
```
public int getActiveConnections()
```
    Returns the number of active (open) connections of this pool. This is the number of Connection objects that have been issued by getConnection() for which Connection.close() has not yet been called.
    
    Returns:
    
    the number of active connections.
  - getLogWriter
```
public java.io.PrintWriter getLogWriter()
```
    INTERNAL
    
    Specified by:
    
    getLogWriter in interface javax.sql.CommonDataSource
  - setLogWriter
```
public void setLogWriter(java.io.PrintWriter logWriter)
```
    INTERNAL
    
    Specified by:
    
    setLogWriter in interface javax.sql.CommonDataSource
  - unwrap
```
public <T> T unwrap(java.lang.Class<T> iface)
             throws java.sql.SQLException
```
    Return an object of this class if possible.
    
    Specified by:
    
    unwrap in interface java.sql.Wrapper
    
    Parameters:
    
    iface - the class
    
    Returns:
    
    this
    
    Throws:
    
    java.sql.SQLException
  - isWrapperFor
```
public boolean isWrapperFor(java.lang.Class<?> iface)
                     throws java.sql.SQLException
```
    Checks if unwrap can return an object of this class.
    
    Specified by:
    
    isWrapperFor in interface java.sql.Wrapper
    
    Parameters:
    
    iface - the class
    
    Returns:
    
    whether or not the interface is assignable from this class
    
    Throws:
    
    java.sql.SQLException
  - getParentLogger
```
public java.util.logging.Logger getParentLogger()
```
    [Not supported]
    
    Specified by:
    
    getParentLogger in interface javax.sql.CommonDataSource

Class JdbcConnectionPool

Method Summary

Methods inherited from class java.lang.Object

Method Detail

create

create

setMaxConnections

getMaxConnections

getLoginTimeout

setLoginTimeout

dispose

getConnection

getConnection

connectionClosed

connectionErrorOccurred

getActiveConnections

getLogWriter

setLogWriter

unwrap

isWrapperFor

getParentLogger