Question

如何使用java对mysql数据库中的一行数据查询

Answer 1

　　1、登陆SYS用户，执行以下代码

begin
Dbms_Java.Grant_Permission('PSIID','java.io.FilePermission', '<<ALL FILE>>','read ,write, execute, delete');
Dbms_java.grant_permission('PSIID', 'SYS:java.io.FilePermission', '<<ALL FILES>>','read ,write, execute, delete');
Dbms_Java.Grant_Permission('PSIID', 'java.io.FilePermission', 'd:a.bat','read ,write, execute, delete');
dbms_java.grant_permission('PSIID', 'java.lang.RuntimePermission','*','writeFileDescriptor' );
end;

2、登陆psiid用户创建java程序资源

create or replace and compile
java source named "Util"
as
import java.io.*;
import java.lang.*;
public class Util extends Object
{
public static int RunThis(String args)
{
Runtime rt = Runtime.getRuntime();
int rc = -1;
try
{
Process p = rt.exec(args);
int bufSize = 4096;
BufferedInputStream bis =
new BufferedInputStream(p.getInputStream(), bufSize);
int len;
byte buffer[] = new byte[bufSize];
// Echo back what the program spit out
while ((len = bis.read(buffer, 0, bufSize)) != -1)
System.out.write(buffer, 0, len);
rc = p.waitFor();
}
catch (Exception e)
{
e.printStackTrace();
rc = -1;
}
finally
{
return rc;
}
}
}

3、创建调用Java资源的函数

create or replace function RUN_CMD(p_cmd in varchar2) return number
as
language java name 'Util.RunThis(java.lang.String) return integer';

4、建立一过程调用存储过程

create or replace procedure RUN(p_cmd in varchar2)
as
x number;
begin
x := run_cmd(p_cmd);
end;

------------------------------
------- 执行例子
------------------------------
--d:a.bat 文件
cd d:
rename %1 %2

SQL> exec rc('d:a.bat mytest.sql b.sql') ;
D:oracleora92DATABASE>cd d:
D:>rename mytest.sql b.sql

exec :x := RUN_CMD('ipconfig');

variable x number;
exec dbms_java.set_output(100000);
exec :x := RUN_CMD('ipconfig');
exec :x := RUN_CMD('d:a.bat') ;

Answer 2

使用where条件啊！