Java SQL routines

Your iSeries™ server provides the ability to access Java™ programs from SQL statements and programs. This can be done using Java stored procedures and Java user-defined functions (UDFs). The iSeries server supports both the DB2^® and SQLJ conventions for calling Java stored procedures and Java UDFs. Both Java stored procedures and Java UDFs can use Java classes that are stored in JAR files. The iSeries server uses stored procedures defined by the SQLJ Part 1 standard to register JAR files with the database.

• Use Java SQL routines
  You can access Java programs from SQL statements and programs. This can be done using Java stored procedures and Java user-defined functions (UDFs).
• Java stored procedures
  When using Java to write stored procedures, you can use two possible parameter passing styles.
• Java user-defined scalar functions
  A Java scalar function returns one value from a Java program to the database. For example, a scalar function could be created that returns the sum of two numbers.
• SQLJ procedures that manipulate JAR files
  Both Java stored procedures and Java UDFs can use Java classes that are stored in Java JAR files.
• Parameter passing conventions for Java stored procedures and UDFs
  The following table lists how SQL data types are represented in Java stored procedures and UDFs.