Oracle triggers reverse call to Java program

Import jar Package in Oracle to import the required jar package, we put the edited Java class into a jar package, directly in the oarcle to write a simple call on it,1, the operating system needs to have a JDK that supports the Loadjava command. 2, load the Jlha.jar package into the Oracle database. Operation process: In DOS environment, input command: Loadjava-r-f-o-user usscares/[email protected] Jlha.jar Note: The jar package is to be compiled in 1.4 environment, Project right-click Properties Java compiler Compoler compliance level1.4 or Else version 49similar error calling Java class Oracle calls the Java class method mainly has the following three kinds: load with the Loadjava method, may be debugging convenient, it is said that this method is more common. C:\test\hello.java Public classhello{ Public Static voidMain (string[] args) {System.out.println ("Hello"); Hello h=Newhello (); H.insertm (9); }     Public Static voidInsertm (intpid) {System.out.println ("This is the method Insertm."); }} C:\test>loadjava-u Test/[email Protected]-V-Resolve Hello.javasql> CREATE PROCEDURE prc_hehe as language Java name ' Hello.main (java.lang.string[])The process has been created. SQL>call Prc_hehe (); calls complete. SQL> Set serveroutput on Size 2000SQL>call Prc_hehe (); calls complete. SQL> Exec dbms_java.set_output (2000);P L/The SQL process has completed successfully. SQL>Call Prc_hehe (); Hellothis is the method Insertm. Call complete. SQL>show errors; modify Java class, first remove Reload, method: Dropjava-u test/[email protected]-V-Resolve Hello.javaloadjava-u test/[email protected]-V-Resolve Hello.java Creating a Create or Replace with SQL statement and compile Java source named Heheas Public classhello{ Public Static voidmsg (String name) {System.out.println ("Hello," +name); }}; Create or Replace procedure Prc_hehe (p_name VARCHAR2) aslanguage Java name' Hello.msg (java.lang.String) ';--Call Result SQL> Call Prc_hehe (' Oopp '); Hello,oopp use an external CLASS file to mount the Create or replace directory Class_dir as' C:\Test '; Create or replace JavaclassUsing bfile (Class_dir, ' Hello.class 'Create or Replace procedure Prc_hello (p_name VARCHAR2) aslanguage Java name' Hello.msg (java.lang.String) ';--test Result SQL> Call Prc_hello (' Java '); Java may appear error SQL> Call Prc_hello (' Jerry '); Call Prc_hello (' Jerry ')     *Section1line error: ORA-29516:aurora Assertion Failure: Assertion failure at eox.c:359uncaught exception System Error:java/lang/unsupportedclassversionerror Reason: The machine has multiple Java versions, and the Java version of Oracle is lower than the version set by the environment variable. Workaround: Use $oracle_home/jdk/Javac recompile java file Check Java has imported database select* from User_source where type like ' java% ' and NAME = ' <java file> 'Establish functioncreate OR REPLACE FUNCTION<FUNCTION_NAME> (<parameter LIST in ORACLE datatype>) return <oracle DATATYPE of return variable>As LANGUAGE JAVA NAME' <clase.method> (<parameter list in Java datatype>) return Java datatype of return variable 'Login to a user and create a Java program resource in PL/Java code in SQL is displayed in Java source that you write; Create or replace and compile Java source named BB_WX_REPLOSSSBK asImportJava.sql.*;ImportOracle.jdbc.driver.*; Public classbb_wx_replosssbk{/*** Loss of Social Security card*/     Public Staticstring Callproc (String Ssfzh, String spwd, String stype) {Oracledriver driver=NewOracledriver (); Connection Connection=NULL; CallableStatement cstmt=NULL; String Srtn= "Beg"; Try{Srtn= "Try Beg"; Connection= Drivermanager.getconnection ("Jdbc:oracle:thin:user/[email PROTECTED]:1521:ORCL"); Srtn= "Con"; Cstmt= Connection.preparecall ("{Call RUN_REPLOSSSBK (?,?,?,?)}"); Srtn= "Invoke"; Cstmt.setstring (1, Ssfzh); Cstmt.setstring (2, SPWD); Cstmt.setstring (3, stype); Cstmt.registeroutparameter (4, Java.sql.Types.VARCHAR); Srtn= "Set Value";            Cstmt.executeupdate (); Srtn= "Execute"; Srtn= Cstmt.getstring (4); }        Catch(Exception e) {Srtn=e.tostring ();        E.printstacktrace (); }        finally        {            Try            {                if(Cstmt! =NULL) {cstmt.close (); }                if(Connection! =NULL) {connection.close (); }            }            Catch(Exception e) {e.printstacktrace (); }        }        returnSrtn; }} Create a function that calls Java resources Create or Replace function RUN_BB_WX_REPLOSSSBK (Ssfz in Varchar2,spwd in Varchar2,stype in varchar2)returnvarchar2as language Java name' Bb_wx_replosssbk.callproc (java.lang.string,java.lang.string,java.lang.string) return java.lang.String 'Create a procedure call stored procedure Create or Replace procedure RUN (Ssfz in Varchar2,spwd in Varchar2,stype in Varchar2srtn out varchar2) Asbeg Inch--SRTN: =RUN_BB_WX_REPLOSSSBK (Ssfz in Varchar2,spwd in Varchar2,stype in varchar2); Select RUN_BB_WX_REPLOSSSBK (Ssfz in Varchar2,spwd, Varchar2,stype in varchar2) to Srtn from Dual;end;/attached: If Java Access file is required, use DBA user to empower exec dbms_java.grant_permission (' onboarding ', ' SYS:java.lang.RuntimePermission ', ' writefiledescriptor ', '); EXEC Dbms_java.grant_permission (' onboarding ', ' SYS:java.lang.RuntimePermission ', ' readfiledescriptor ', '); EXEC Dbms_java.grant_permission (' onboarding ', ' SYS:java.io.FilePermission ', ' <<all files>> ', ' execute '); The following statement of permission is exec dbms_java.revoke_permission (' onboarding ', ' SYS:java.lang.RuntimePermission ', ' writefiledescriptor ', '); EXEC Dbms_java.revoke_permission (' onboarding ', ' SYS:java.lang.RuntimePermission ', ' readfiledescriptor ', '); EXEC Dbms_java.revoke_permission (' onboarding ', ' SYS:java.io.FilePermission ', ' <<all files>> ', ' execute ');

Oracle triggers reverse calling Java programs