1.先在数据库中创建一张表:
CREATE TABLE CLASS_INFO( CLASS_ID NUMBER(5,0), CLASS_NAME VARCHAR2(20), CONSTRAINT PK_CLASS_INFO PRIMARY KEY(CLASS_ID), //添加主键约束 CONSTRAINT UQ_CLASS_NAME UNIQUE(CLASS_NAME) //添加唯一约束 )
然后插入一条测试数据:
INSER INTO CLASS_INFO(CLASS_ID,CLASS_NAME) VALUES(1,'网络工程班');
2.新建一个存储教程
CREATE OR REPLACE PROCEDUE add_classInfo(classid IN number,classname OUT varchar2) //输入输出参数可只写类型,不用写长度 AS BEGIN SELECT class_name INTO classname FROM class_info WHERE class_id=classid; END;
3调用存储过程:
DECLARE className VARCHAR2(20); //此处必须给定长度,不然报错 BEGIN add_classInfo(1,className); //调用存储过程 DBMS_OUTPUT.PUT_LINE(className); END;
4输出的结果则应为“网络一班”,如果没有输入,请打开输出服务:set serveroutput on;