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用Java编写Oracle数据库存储过程

Jun 07, 2016 pm 03:02 PM
java oracle storage database write process Enter

欢迎进入Java社区论坛,与200万技术人员互动交流 >>进入 Oracle里可以使用多种语言来编写存储过程,比如Pro*C/C++,PL/SQL,COBOL,在Oracle8i开始支持用Java编写存储过程。 如果非要写存储过程的话,做为以Java谋生的我,首选用Java编写,用PL/SQL需要记忆很多

欢迎进入Java社区论坛,与200万技术人员互动交流 >>进入

    Oracle里可以使用多种语言来编写存储过程,比如Pro*C/C++,PL/SQL,COBOL,在Oracle8i开始支持用Java编写存储过程。

    如果非要写存储过程的话,做为以Java谋生的我,首选用Java编写,用PL/SQL需要记忆很多的语法(Pascal类的语法)和函数,远不如使用Java/JDBC这么轻车熟路。而且,DB2等数据库都支持Java存储过程,所以不比为每一种数据学习一种编写存储过程的方法了。

Java存储过程与一般的JDBC程序有所不同的是:
1.有安全限制,毕竟是在oracle内部运行的,不允许访问操作系统的资源,如文件。
2.获取数据库联接方式,connection = new OracleDriver().defaultConnection();
3.System.out,System.err,System.in等输入输出有所不同。可以利用某些命令重定向。

下面用Java 存储过程写一个Hello World的例子。
1)在plsqldeveloper里,java source里增加一个TestJava1类,

代码

 

  create or replace and compile java source named TestJava1 as
 
public class TestJava1
  
{
  
  public static void test()
  
  {
  
   System.out.println("Hello");
  
  }
  
} 

执行它,以保存并编译。

2)增加一个procedure,执行如下命令:

代码

create or replace procedure testJava1 as language java name 'TestJava1.test()';  

3)在command window里输入

代码

SET SERVEROUTPUT ON;   
CALL dbms_java.set_output(2000);   

 
以使System.out重定向到当前窗口;
在command window里输入,exec testJava1();
即可看到结果:

Hello

PL/SQL procedure successfully completed

用Java编写Oracle数据库存储过程

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