クラス org.objectweb.cjdbc.controller.connection.DriverManager

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説明

This class defines a DriverManager. In contrast to java.sql.DriverManager this class allows to use Drivers with the same name but with different versions, if no drivername is used it is a wrapper around java.sql.DriverManager.

作者:

Emmanuel Cecchet

バージョン:

1.0

DriverManager.java の 52 行で定義されています。

Static Public メソッド
Connection	getConnection (String url, String user, String password, String driverPathName, String driverClassName) throws SQLException
void	loadDriverClass (String driverClassName) throws ClassNotFoundException
File	convertToAbsolutePath (String pathName) throws IOException
スタティック変数
Trace	logger
Static Private メソッド
File	getDriversDir () throws IOException
Connection	getConnectionForDriver (String url, String user, String password, Driver driver) throws SQLException
Driver	loadDriver (File path, String driverClassName) throws ClassNotFoundException, InstantiationException, IllegalAccessException
Static Private 変数
Set	defaultDrivers = new HashSet()
Map	namedDrivers = new HashMap()

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メソッド

File org.objectweb.cjdbc.controller.connection.DriverManager.convertToAbsolutePath (  String  pathName  )  throws IOException [static]

convert a path into an absolute path if the path is already an absolute path, it is just returned otherwise a relative path is considered to be relative to the drivers directory 引数: pathName  the relativ or absolute path 戻り値: the converted path 例外: IOException  if the converted path does not exist DriverManager.java の 208 行で定義されています。 参照先 org.objectweb.cjdbc.controller.connection.DriverManager.getDriversDir(), と org.objectweb.cjdbc.controller.connection.DriverManager.logger. 参照元 org.objectweb.cjdbc.controller.connection.DriverManager.getConnection(). { File dir = null; if (pathName != null) { File path = new File(pathName); if (path.canRead()) return path; else throw new IOException("Invalid path name " + pathName); } else { dir = getDriversDir(); } if (!dir.canRead()) { String msg = Translate.get("controller.driver.dir.not.found"); logger.error(msg); throw new IOException(msg); } return dir; }

Connection org.objectweb.cjdbc.controller.connection.DriverManager.getConnection (  String  url, String  user, String  password, String  driverPathName, String  driverClassName )  throws SQLException [static]

Attempts to establish a connection to the given database URL. The DriverManager attempts to select an appropriate driver from the set of registered JDBC drivers. 引数: url  a database url of the form jdbc:subprotocol:subname user  the database user on whose behalf the connection is being made password  the user's password driverPathName  the path where the driver classes are located, null if default directory driverClassName  the class name of the driver 戻り値: a connection to the URL 例外: SQLException  if a database access error occurs DriverManager.java の 85 行で定義されています。 参照先 org.objectweb.cjdbc.controller.connection.DriverManager.convertToAbsolutePath(), org.objectweb.cjdbc.controller.connection.DriverManager.getConnectionForDriver(), org.objectweb.cjdbc.controller.connection.DriverManager.getDriversDir(), org.objectweb.cjdbc.controller.connection.DriverManager.loadDriver(), org.objectweb.cjdbc.controller.connection.DriverManager.loadDriverClass(), org.objectweb.cjdbc.controller.connection.DriverManager.logger, と org.objectweb.cjdbc.controller.connection.DriverManager.namedDrivers. { Driver driver = null; boolean isDefaultPath = false; if (driverPathName == null) { // no path specified // have we already loaded this driver driver = (Driver) namedDrivers.get(driverClassName); if (driver == null) { // the driver has not yet been loaded // first we try to load class from classpath try { if (driverClassName != null) { loadDriverClass(driverClassName); } return java.sql.DriverManager.getConnection(url, user, password); } catch (ClassNotFoundException e) { if (driverClassName == null) { throw new SQLException( "could not load driver as no class name is specified "); } try { driverPathName = getDriversDir().getAbsolutePath(); isDefaultPath = true; } catch (IOException ioExc) { throw new SQLException("could not find default drivers directory"); } } } } if (driver == null) { // have we already loaded this named driver ? driver = (Driver) namedDrivers.get(driverPathName); } if (driver == null) { // no driver with this name has been loaded so far try { File path = convertToAbsolutePath(driverPathName); // we load the driver now if (logger.isDebugEnabled()) { logger.debug("loading driver with name " + driverPathName + " for class " + driverClassName); } driver = loadDriver(path, driverClassName); } catch (Exception e) { if (logger.isDebugEnabled()) { logger.debug("could not load driver for class " + driverClassName, e); } throw new SQLException("could not load driver for class name " + driverClassName + " and driverPath " + driverPathName); } // driver has been loaded successfully, we cache it for // further use if (isDefaultPath) {// we cache it with the class name namedDrivers.put(driverClassName, driver); } else { // we cache it with the pathName namedDrivers.put(driverPathName, driver); } } return getConnectionForDriver(url, user, password, driver); }

Connection org.objectweb.cjdbc.controller.connection.DriverManager.getConnectionForDriver (  String  url, String  user, String  password, Driver  driver )  throws SQLException [static, private]

DriverManager.java の 250 行で定義されています。 参照元 org.objectweb.cjdbc.controller.connection.DriverManager.getConnection(). { java.util.Properties info = new java.util.Properties(); if (user != null) { info.put("user", user); } if (password != null) { info.put("password", password); } return driver.connect(url, info); }

File org.objectweb.cjdbc.controller.connection.DriverManager.getDriversDir (   )  throws IOException [static, private]

DriverManager.java の 235 行で定義されています。 参照先 org.objectweb.cjdbc.controller.connection.DriverManager.logger. 参照元 org.objectweb.cjdbc.controller.connection.DriverManager.convertToAbsolutePath(), と org.objectweb.cjdbc.controller.connection.DriverManager.getConnection(). { URL url = Controller.class .getResource(ControllerConstants.C_JDBC_DRIVER_JAR_FILE); File driversDir = new File(url.getFile()).getParentFile(); if (!driversDir.exists()) { String msg = Translate.get("controller.driver.dir.not.found"); logger.error(msg); throw new IOException(msg); } return driversDir; }

Driver org.objectweb.cjdbc.controller.connection.DriverManager.loadDriver (  File  path, String  driverClassName )  throws ClassNotFoundException, InstantiationException, IllegalAccessException [static, private]

DriverManager.java の 266 行で定義されています。 参照先 org.objectweb.cjdbc.controller.connection.DriverManager.logger. 参照元 org.objectweb.cjdbc.controller.connection.DriverManager.getConnection(). { ClassLoader loader = new DriverClassLoader(null, path); // load java.sql.DriverManager with the new classloader // Driver instances register with the DriverManager and we want the new // Driver to register with its own DriverManager // Otherwise the new Driver would register with the default DriverManager // and possibly overwrite an other driver with the same name Class.forName(java.sql.DriverManager.class.getName(), true, loader); // load class Class driverClass = Class.forName(driverClassName, true, loader); if (logger.isDebugEnabled()) logger.debug(Translate.get("backend.driver.loaded", driverClassName)); // get an instance of the class and return it return (Driver) driverClass.newInstance(); }

void org.objectweb.cjdbc.controller.connection.DriverManager.loadDriverClass (  String  driverClassName  )  throws ClassNotFoundException [static]

Load the driver class 引数: driverClassName  the class name of the driver 例外: ClassNotFoundException  if the class could not be found DriverManager.java の 181 行で定義されています。 参照先 org.objectweb.cjdbc.controller.connection.DriverManager.defaultDrivers, と org.objectweb.cjdbc.controller.connection.DriverManager.logger. 参照元 org.objectweb.cjdbc.controller.connection.DriverManager.getConnection(). { if (!defaultDrivers.contains(driverClassName)) { if (logger.isDebugEnabled()) { logger.debug("we are using default classloader and driverClassName =" + driverClassName); } Class.forName(driverClassName); if (logger.isDebugEnabled()) logger.debug(Translate.get("backend.driver.loaded", driverClassName)); // the driver was successfully loaded defaultDrivers.add(driverClassName); } }

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変数

Set org.objectweb.cjdbc.controller.connection.DriverManager.defaultDrivers = new HashSet() [static, private]

Driver class names read from default drivers, without driverPath DriverManager.java の 62 行で定義されています。 参照元 org.objectweb.cjdbc.controller.connection.DriverManager.loadDriverClass().

Trace org.objectweb.cjdbc.controller.connection.DriverManager.logger [static, package]

初期値: Trace .getLogger("org.objectweb.cjdbc.controller.connection.DriverManager") Logger instance. DriverManager.java の 56 行で定義されています。 参照元 org.objectweb.cjdbc.controller.connection.DriverManager.convertToAbsolutePath(), org.objectweb.cjdbc.controller.connection.DriverManager.getConnection(), org.objectweb.cjdbc.controller.connection.DriverManager.getDriversDir(), org.objectweb.cjdbc.controller.connection.DriverManager.loadDriver(), と org.objectweb.cjdbc.controller.connection.DriverManager.loadDriverClass().

Map org.objectweb.cjdbc.controller.connection.DriverManager.namedDrivers = new HashMap() [static, private]

We keep a reference to already loaded named drivers. Each named driver has been loaded with a separate classloader. DriverManager.java の 68 行で定義されています。 参照元 org.objectweb.cjdbc.controller.connection.DriverManager.getConnection().

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このクラスの説明は次のファイルから生成されました:

• src/org/objectweb/cjdbc/controller/connection/DriverManager.java

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