SAS Drivers for JDBC and SAS/CONNECT: Class MVADriver

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com.sas.rio
Class MVADriver

java.lang.Object
  |
  +--com.sas.rio.MVADriver

All Implemented Interfaces:

public class MVADriver
extends Object
implements java.sql.Driver

MVADriver class implements the Driver interface.

The DriverManager will try to load as many drivers as it can find and then for any given connection request, it will ask each driver in turn to try to connect to the target URL.

When a Driver class is loaded, it should create an instance of itself and register it with the DriverManager. This means that a user can load and register a driver by doing Class.forName("foo.bah.Driver").

See Also:: MVAConnection

Field Summary

Constructor Summary

Method Summary

boolean acceptsURL(String url)
          Returns True if the driver thinks that it can open a connection to the given URL, else returns False.

Connection connect(String url, Properties info)
          Attempts to make a database connection to the server specified by the URL.

int getMajorVersion()
          Gets the driver's major version number.

int getMinorVersion()
          Gets the driver's minor version number.

DriverPropertyInfo[] getPropertyInfo(String url, Properties info)
          Gets a DriverPropertyInfo object that lists the properties for the SAS/Integrated Object Model driver for JDBC.

boolean jdbcCompliant()
          Reports whether the Driver is a genuine JDBC COMPLIANT (tm) driver.

Methods inherited from class java.lang.Object

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

Field Detail

Constructor Detail

Method Detail

connect

public Connection connect(String url,
                          Properties info)
                   throws SQLException

Attempts to make a database connection to the server specified by the URL. The driver returns a NULL if it determines that it is the wrong kind of driver to connect to the server. The driver raises an SQLException if it is the right driver to connect to the server, but cannot connect to the database.

The connect method accepts a string representation of a URL and a java.util.Properties object as input.

Specified by:: connect in interface Driver

Parameters:

url - The URL of the database to connect to. If the URL does not specify sasiom, a NULL is returned.

The URL must be of the form:

      jdbc:sasiom://hostname:portnumber

where hostname is the name of the machine where the MVA server is running, and portnumber is the port the MVA server is configured to use.

info - A list of connection arguments as a Properties object. The properties for the MVAConnection class are as follows:

userName

A valid username for the MVA server you specify in the URL.

password

The password that corresponds to the username you specify with the userName property.

librefs

A list of libnames and corresponding paths that specify the location of each data set your program will access. The librefs property value must be specifies as follows:

      (libname 'filepath'; libname 'filepath';...)

dbms

The name of the DBMS your program will access; the value must be eight characters padded with blanks. The default is "SQLVIEW ", which specifies that SAS data sets will be accessed. If you are not accessing SAS data, specify the name of the foreign DBMS as it is defined using SAS/ACCESS software.

dbmsOptions

Options for the foreign DBMS your program will access. Specify the options as you specify the database-definition arguments when using the PROC SQL statement CONNECT TO.

remarks

A Boolean value that determines whether the SAS/Integrated Object Model driver for JDBC returns the data set label for each data set in the library that your program accesses. If the value is True, the labels are returned; the default value is False.

Note: When this property is set to True, any operation that involves reading and returning data set labels can result in poor performance because each data set must be opened in order to read the label. For example, if this property is set to True, performance may be degraded when using the MVADatabaseMetaData.getTables() method to retrieve a description of the tables in a catalog.

undoPolicyNone

A Boolean value that determines whether changes to the data are undone when an UPDATE or INSERT statement generates errors. When the value is set to True (the recommended setting), the changes are not undone; when the value is set to False, the server attempts to undo the changes.

encryptionPolicy

whether or not JavaBridge should attempt to negotiate with the server over which encryption algorithm to use and what to do if the negotiations fail. Possible values:

none: do not use encryption. This is the default.
optional: attempt to use encryption but, if algorithm negotiation fails, continue with an unencrypted session
required: attempt to use encryption but, if algorithm negotiation fails, fail the connection

encryptionContent

specifies which messages should be encrypted if encryption is used. Possible values:

all: encrypt all messages. This is the default.
authentication: encrypt only messages that contain user name and password information.

encryptionAlgorithms

the list of algorithms you are willing to use in order of preference. Values in the list should be separated by commas and chosen from sasproprietary, rc2, rc4, des, or tripledes. If no value is specified, then one of the server's favorite algorithms will be used.

Note that the server's encryption policy is, by default, optional so no special action is needed to prepare an IOM BRIDGE server to use encryption. However, it is possible to set up the server so that encryption is required. Consult IOM BRIDGE server documentation for details.

applyFormats

specifies whether or not column formats are applied when retrieving data. If the value is true, all data is returned as Strings. For any column, the format used is the one defined on the column in the dataset. If "applyFormats" is set to false (the default case) no formatting is applied.

Note: Users have the ability to pass in properties embedded in the url. The syntax for this is "url?[attr=value]&[...]", where attr is a valid property name, and value is a valid name. If users make use of this functionality, then if properties are also passed in via the Properties object, the properties in the url will, in the case of conflicts, override those in the Properties object. This means that if a user specifies a libref (for example) in both the URL and in the Properties object, the libref in the url will be the one to take precedence, and the one in the Properties object will be ignored.

Returns:

A connection to the URL if the correct form of URL is used; otherwise, a NULL is returned.

Throws:

SQLException - This exception is thrown if a RIOException is detected.

acceptsURL

public boolean acceptsURL(String url)
                   throws SQLException

Returns True if the driver thinks that it can open a connection to the given URL, else returns False.

Specified by:: acceptsURL in interface Driver

Parameters:: url - The URL of the database.
Returns:: True if this driver can connect to the given URL.
Throws:: SQLException - This exception is required by the interface but it is never thrown.

getPropertyInfo

public DriverPropertyInfo[] getPropertyInfo(String url,
                                            Properties info)
                                     throws SQLException

Gets a DriverPropertyInfo object that lists the properties for the SAS/Integrated Object Model driver for JDBC. The properties are as follows: