Oracle触发器反向调用Java程序

Posted 2020-08-15 qingxin

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/[email protected]   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/[email protected] -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/[email protected] -v -resolve hello.java

loadjava -u test/[email protected] -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/[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();
            }
        }
        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‘ );