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## javax.xml.xquery
Interface XQDataSource

All Known Implementing Classes:
  SaxonXQDataSource

    public interface XQDataSource

An `XQDataSource` is a factory for `XQConnection` objects. The datasource may be obtained from a JNDI source or through other means.
The XQuery connection (`XQConnection`) objects may be created using an existing JDBC connection. This is an optional feature that may not be supported by all implementations. If the implementation supports this mechanism, then the XQuery connection may inherit some of the JDBC connection's properties, such as login timeout, log writer etc.

Method Summary
`XQConnection` | `getConnection()` Attempts to create a connection to an XML datasource.
`XQConnection` | `getConnection(Connection con)` Attempts to create a connection to an XML datasource using an existing JDBC connection.
`XQConnection` | `getConnection(String username, String passwd)` Attempts to establish a connection to an XML datasource using the supplied username and password.
`int` | `getLoginTimeout()` Gets the maximum time in seconds that this datasource can wait while attempting to connect to a database.
`PrintWriter` | `getLogWriter()` Retrieves the log writer for this `XQDataSource` object.
`String` | `getProperty(String name)` Returns the current value of the named property if set, else `null`.
`String[]` | `getSupportedPropertyNames()` Returns an array containing the property names supported by this `XQDataSource`.
`void` | `setLoginTimeout(int seconds)` Sets the maximum time in seconds that this datasource will wait while attempting to connect to a database.
`void` | `setLogWriter(PrintWriter out)` Sets the log writer for this `XQDataSource` object to the given `java.io.PrintWriter` object.
`void` | `setProperties(Properties props)` Sets the data source properties from the specified `Properties` instance.
`void` | `setProperty(String name, String value)` Sets the named property to the specified value.

Method Detail

### getConnection

    XQConnection getConnection()
                               throws XQException

  Attempts to create a connection to an XML datasource.

  Returns:
    a connection to the XML datasource
  Throws:
    `XQException` - if a datasource access error occurs

### getConnection

    XQConnection getConnection(Connection con)
                               throws XQException

  Attempts to create a connection to an XML datasource using an existing JDBC connection. An XQJ implementation is not required to support this method. If it is not supported, then an exception (`XQException`) is thrown. The XQJ and JDBC connections will operate under the same transaction context.

  Parameters:
    `con` - an existing JDBC connection
  Returns:
    a connection to the XML datasource
  Throws:
    `XQException` - if (1) a datasource access error occurs, (2) the implementation does not support this method of getting an `XQConnection`, or (3) if the `con` parameter is `null`

### getConnection

    XQConnection getConnection(String username,
                               String passwd)
                               throws XQException

  Attempts to establish a connection to an XML datasource using the supplied username and password.

  Parameters:
    `username` - the user on whose behalf the connection is being made
    `passwd` - the user's password
  Returns:
    a connection to the XML datasource
  Throws:
    `XQException` - if a datasource access error occurs

### getLoginTimeout

    int getLoginTimeout()
                        throws XQException

  Gets the maximum time in seconds that this datasource 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 XQDataSource object is created, the login timeout is initially zero. It is implementation-defined whether the returned login timeout is actually used by the data source implementation.

  Returns:
    the datasource login time limit
  Throws:
    `XQException` - if a datasource access error occurs

### getLogWriter

    PrintWriter getLogWriter()
                             throws XQException

  Retrieves the log writer for this `XQDataSource` object. The log writer is a character output stream to which all logging and tracing messages for this datasource 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. When a `XQDataSource` object is created, the log writer is initially `null`; in other words, the default is for logging to be disabled.

  Returns:
    the log writer for this datasource or `null` if logging is disabled
  Throws:
    `XQException` - if a datasource access error occurs

### getSupportedPropertyNames

    String[] getSupportedPropertyNames()

  Returns an array containing the property names supported by this `XQDataSource`. Implementations that support user name and password must recognize the user name and password properties listed below.

  `user` | the user name to use for creating a connection
  `password` | the password to use for creating a connection

  Any additional properties are implementation-defined.

  Returns:
    `String[]` an array of property names supported by this implementation

### setProperty

    void setProperty(String name,
                     String value)
                     throws XQException

  Sets the named property to the specified value. If a property with the same name was already set, then this method will override the old value for that property with the new value.

  If the implementation does not support the given property or if it can determine that the value given for this property is invalid, then an exception is thrown. If an exception is thrown, then no previous value is overwritten.

  Parameters:
    `name` - the name of the property to set
    `value` - the value of the named property
  Throws:
    `XQException` - if (1) the given property is not recognized, (2) the value for the given property is determined to be invalid, or (3) the `name` parameter is `null`

### getProperty

    String getProperty(String name)
                       throws XQException

  Returns the current value of the named property if set, else `null`. If the implementation does not support the given property then an exception is raised.

  Parameters:
    `name` - the name of the property whose value is needed
  Returns:
    `String` representing the value of the required property if set, else `null`
  Throws:
    `XQException` - if (1) a given property is not supported, or (2) the name parameter is `null`

### setProperties

    void setProperties(Properties props)
                       throws XQException

  Sets the data source properties from the specified `Properties` instance. Properties set before this call will still apply but those with the same name as any of these properties will be replaced. Properties set after this call also apply and may replace properties set during this call.

  If the implementation does not support one or more of the given property names, or if it can determine that the value given for a specific property is invalid, then an exception is thrown. If an exception is thrown, then no previous value is overwritten. is invalid, then an exception is raised.

  Parameters:
    `props` - the list of properties to set
  Throws:
    `XQException` - if (1) a given property is not recognized, (2) the value for a given property is determined to be invalid, or (3) the `props` parameter is `null`

### setLoginTimeout

    void setLoginTimeout(int seconds)
                         throws XQException

  Sets the maximum time in seconds that this datasource 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 `XQDataSource` object is created, the login timeout is initially zero. It is implementation-defined whether the specified login timeout is actually used by the data source implementation. If the connection is created over an existing JDBC connection, then the login timeout value from the underlying JDBC connection may be used.

  Parameters:
    `seconds` - the datasource login time limit
  Throws:
    `XQException` - if a datasource access error occurs

### setLogWriter

    void setLogWriter(PrintWriter out)
                      throws XQException

  Sets the log writer for this `XQDataSource` 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 datasource 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. When a `XQDataSource` object is created the log writer is initially `null`; in other words, the default is for logging to be disabled.

  Parameters:
    `out` - the new log writer; to disable logging, set to `null`
  Throws:
    `XQException` - if a datasource access error occurs

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