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/*==============================================================*/
/* DBMS name: ORACLE Version 11g */
/* Created on: 2016/5/27 16:20:29 */
/*==============================================================*/
WHENEVER SQLERROR EXIT --查询执行异常时自动停止
set serveroutput on --显示输出日志
--判断脚本是否已经执行过
declare
var_upgrade_version varchar2(32) := 'V02.000.00';
var_exists_version varchar2(32) ;
no_result EXCEPTION;
BEGIN
SELECT count(1) INTO var_exists_version from BD_DATABASE_VERSION where version_source=var_upgrade_version;
IF var_exists_version>0 THEN
dbms_output.put_line('==============>当前脚本已升级');
RAISE no_result;--抛出异常，程序停止
END IF;
END;
/
alter table test drop column ES_CODE;