SAS/ACCESS 9.2 for Relational Databases: Reference, Fourth Edition

90 LIBNAME Statement Syntax for Relational Databases 4 Chapter 10reference section for your SAS/ACCESS interface . For more information aboutLIBNAME options, see “LIBNAME Options for Relational Databases” on page 92.CLEARdisassociates one or more currently assigned librefs.Specify libref to disassociate a single libref. Specify _ALL_ to disassociate allcurrently assigned librefs._ALL_specifies that the CLEAR or LIST argument applies to all currently assigned librefs.LISTwrites the attributes of one or more SAS/ACCESS libraries or SAS libraries to theSAS log.Specify libref to list the attributes of a single SAS/ACCESS library or SAS library.Specify _ALL_ to list the attributes of all libraries that have librefs in your currentsession.Detailsu Using Data from a DBMS You can use a LIBNAME statement to read from andwrite to a DBMS table or view as if it were a SAS data set.For example, in MYDBLIB.EMPLOYEES_Q2, MYDBLIB is a SAS libref that pointsto a particular group of DBMS objects, and EMPLOYEES_Q2 is a DBMS table name.When you specify MYDBLIB.EMPLOYEES_Q2 in a DATA step or procedure, youdynamically access the DBMS table. SAS supports reading, updating, creating, anddeleting DBMS tables dynamically.v Disassociating a Libref from a SAS Library To disassociate or clear a libref from aDBMS, use a LIBNAME statement. Specify the libref (for example, MYDBLIB) and theCLEAR option as shown here:libname mydblib CLEAR;You can clear a single specified libref or all current librefs.The database engine disconnects from the database and closes any free threads orresources that are associated with that libref’s connection.w Writing SAS Library Attributes to the SAS Log Use a LIBNAME statement to writethe attributes of one or more SAS/ACCESS libraries or SAS libraries to the SAS log.Specify libref to list the attributes of a single SAS/ACCESS library or SAS library, asfollows:libname mydblib LIST;Specify _ALL_ to list the attributes of all libraries that have librefs in your currentsession.SQL Views with Embedded LIBNAME StatementsWith SAS software, you can embed LIBNAME statements in the definition of an SQLview. This means that you can store a LIBNAME statement in an SQL view thatcontains all information that is required to connect to a DBMS. Whenever the SQL viewis read, PROC SQL uses the embedded LIBNAME statement to assign a libref. Afterthe view has been processed, PROC SQL de-assigns the libref.In this example, an SQL view of the Oracle table DEPT is created. Whenever youuse this view in a SAS program, the ORALIB library is assigned. The library uses the