Create Java Stored Procedure
Don’t save Java source in database
(1) Create a java class and use javac to compile the .java file to .class file.
(2) Use loadjava utility to load .class file to database
(3) Create a PL/SQL wrapper procedure around the java method.
(4) Call the PLSQL procedure as usual.
Example:
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// Hello.java public class Hello { public static String world(){ return "Hello world"; } } C:\PLSQL_JAVA\Test>javac Hello.java C:\PLSQL_JAVA\Test>dir Volume in drive C has no label. Volume Serial Number is 483A-B798 Directory of C:\PLSQL_JAVA\Test 08/09/2012 11:14 AM <DIR> . 08/09/2012 11:14 AM <DIR> .. 08/09/2012 11:14 AM 273 Hello.class 08/09/2012 11:13 AM 88 Hello.java 2 File(s) 361 bytes 2 Dir(s) 144,559,951,872 bytes free C:\PLSQL_JAVA\Test>loadjava -user ro_gem_32_si_b13/a@1.1.1.1/orcl Hello.class C:\PLSQL_JAVA\Test>sqlplus ro_gem_32_si_b13/a@1.1.1.1/orcl SQL*Plus: Release 10.2.0.4.0 - Production on Thu Aug 9 11:15:48 2012 Copyright (c) 1982, 2007, Oracle. All Rights Reserved. Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production With the Partitioning, OLAP, Data Mining and Real Application Testing options SQL> create or replace function helloworld return varchar2 2 as 3 language java name 'Hello.world() return java.lang.String'; 4 / Function created. |
Save Java Source in database
(1) Create a “JAVA SOURCE” object in database. (create or replace java source named xxx as….)
(2) Compile the java source object. (alter java source xxx compile)
(3) Create a PLSQL wrapper procedure around the java method
(4) Call the PLSQL procedure as usual
Example:
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create or replace and resolve java source named "HELLO_WORLD" AS public class Hello { public static String world(){ return "Hello world"; } } / SQL> alter java source HELLO_WORLD compile; SQL> create or replace function helloworld return varchar2 2 as 3 language java name 'Hello.world() return java.lang.String'; 4 / Function created. SQL> select helloworld from dual; HELLOWORLD ------------------------------------------------------------------------- Hello world |
SQLJ
Remember to add “throws SQLException” clause when using SQLJ directive in java class.
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SQL> create or replace and resolve java source named "HELLO_WORLD" 2 AS 3 public class Hello { 4 public static String world() { 5 String returnVal; 6 7 #sql {select 'Hello World' into :returnVal from dual}; 8 9 return returnVal; 10 } 11 } 12 / Java created. SQL> alter java source HELLO_WORLD compile; Warning: Java altered with compilation errors. SQL> show err Errors for JAVA SOURCE "HELLO_WORLD": LINE/COL ERROR -------- ----------------------------------------------------------------- 0/0 HELLO_WORLD:5: unreported exception java.sql.SQLException; must be caught or declared to be thrown 0/0 1 error 0/0 ^ 0/0 #sql {select 'Hello World' into :returnVal from dual}; SQL> create or replace java source named "HELLO_WORLD" 2 AS 3 public class Hello { 4 public static String world() throws SQLException{ 5 String returnVal; 6 7 #sql {select 'Hello World' into :returnVal from dual}; 8 9 return returnVal; 10 } 11 } 12 / Java created. SQL> alter java source HELLO_WORLD compile; Warning: Java altered with compilation errors. SQL> show err Errors for JAVA SOURCE "HELLO_WORLD": LINE/COL ERROR -------- ----------------------------------------------------------------- 0/0 HELLO_WORLD:2: cannot find symbol 0/0 symbol : class SQLException 0/0 1 error 0/0 public static String world() throws SQLException{ 0/0 ^ 0/0 location: class Hello SQL> create or replace java source named "HELLO_WORLD" 2 AS 3 import java.sql.*; 4 public class Hello { 5 public static String world() throws SQLException{ 6 String returnVal; 7 8 #sql {select 'Hello World' into :returnVal from dual}; 9 10 return returnVal; 11 } 12 } 13 / Java created. SQL> alter java source HELLO_WORLD compile; Java altered. |
Reference Doc
Oracle® Database Java Developer's Guide 10g Release 2 (10.2)
