Oracle触发器反向调用Java程序
导入jar包 在oracle中导入需要的jar包,我们把编辑好的java类打成jar包,直接在oarcle里面写简单的调用就可以了, 1、操作系统需要拥有支持loadjava命令的jdk。 2、加载jlha.jar包,到oracle数据库中。 操作过程:在dos环境下,输入命令: loadjava -r -f -o -user usscares/usscares@usscares jlha.jar 注意:jar包要在1.4的环境下编译,项目右键 properties java compiler compoler compliance level 1.4 即可 否则报version 49 类似的错误 调用JAVA类 oracle调用JAVA类的方法主要有以下三种: 用loadjava方法装载; 可能是调试方便,据说这种方法比较通用。 c:\test\hello.java public class hello { public static void main(String[] args) { System.out.println("Hello"); hello h = new hello(); h.insertM(9); } public static void insertM(int pid) { System.out.println("This is the method insertM."); } } C:\test>loadjava -u test/test@mydb -v -resolve hello.java SQL> create procedure prc_hehe as language java name 'hello.main(java.lang.String[]) 过程已创建。 SQL> call prc_hehe(); 调用完成。 SQL> set serveroutput on size 2000 SQL> call prc_hehe(); 调用完成。 SQL> exec dbms_java.set_output(2000); PL/SQL 过程已成功完成。 SQL> call prc_hehe(); Hello This is the method insertM. 调用完成。 SQL>show errors; 修改java类,先删除再装载,方法: dropjava -u test/test@mydb -v -resolve hello.java loadjava -u test/test@mydb -v -resolve hello.java 用sql语句创建 create or replace and compile java source named hehe AS public class hello { public static void msg(String name) { System.out.println("hello," + name); } }; create or replace procedure prc_hehe ( p_name VARCHAR2 ) as language java name 'hello.msg(java.lang.String)'; -- 调用结果 SQL> call prc_hehe('oopp'); hello,oopp 用外部class文件来装载创建 create or replace directory CLASS_DIR as 'c:\test'; create or replace java class using bfile(class_dir,'hello.class'); create or replace procedure prc_hello ( p_name VARCHAR2 ) as language java name 'hello.msg(java.lang.String)'; -- 测试结果 SQL> call prc_hello('java'); java 可能出现的错误 SQL> call prc_hello('Jerry'); call prc_hello('Jerry') * 第 1 行出现错误: ORA-29516: Aurora 断言失败: Assertion failure at eox.c:359 Uncaught exception System error: java/lang/UnsupportedClassVersionError 原因:机器装了多个java版本,oracle的java版本低于环境变量设置的版本。 解决方法:用$ORACLE_HOME/jdk/javac 重新编译java文件 核对java已经导入数据库 select * from user_source where type LIKE 'JAVA%' AND NAME = '<java file>' 建立function CREATE 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'; 例: 登陆某一用户登录,并创建java程序资源,在pl/sql中java source中显示你所编写的java代码; create or replace and compile java source named bb_wx_replosssbk as import java.sql.*; import oracle.jdbc.driver.*; public class bb_wx_replosssbk { /** * 社保卡挂失 */ public static String callProc(String sSfzh, String sPwd, String sType) { OracleDriver driver = new OracleDriver(); Connection connection = null; CallableStatement cstmt = null; String sRtn = "beg"; try { sRtn = " try beg"; connection = DriverManager.getConnection("jdbc:oracle:thin:user/pwd@127.0.0.1:1521: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(); } } return sRtn; } } 创建调用Java资源的函数 create or replace function run_bb_wx_replosssbk( sSfz in varchar2, sPwd in varchar2, sType in varchar2 ) return varchar2 as language java name 'bb_wx_replosssbk.callProc(java.lang.String,java.lang.String,java.lang.String) return java.lang.String'; 建立一过程调用存储过程 create or replace procedure RUN( sSfz in varchar2, sPwd in varchar2, sType in varchar2 sRtn out varchar2 ) as begin --sRtn := run_bb_wx_replosssbk(sSfz in varchar2,sPwd in varchar2,sType in varchar2); Select run_bb_wx_replosssbk(sSfz in varchar2,sPwd in varchar2,sType in varchar2) Into sRtn from dual; end; / 附: 如果需要java存取文件,需要使用dba用户赋权 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' ); 收回权限的语句如下 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' );