CICS
All CICS programs that access DB2 use the CICS attachment facility. CICS provides components that establish the connection to DB2. Many connections, called threads, can be established between a single CICS region and a DB2 subsystem. Each CICS region can attach to only one DB2 subsystem at a time. CICS/DB2 programs using embedded SQL can be written in COBOL, PL/I, C, C++, or Assembler.
CICS programs can also be written in Java using JDBC or SQLJ to access DB2. JDBC does not allow connections to be shared, so non-Java programs that call a Java program should commit or rollback their UOW prior to that call. Unlike SQLJ and JDBC applications that use other attachment facilities, SQLJ and JDBC applications that use the CICS attachment facility ...
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