build: 禁用jpa修改数据库，增加ddl.sql文件记录ddl操作

db/ddl.sql

@@ -0,0 +1,8 @@
+-- 项目ddl SQL语句统一放在这里记录，包括表结构、关联关系、索引、函数、存储过程等
+
+-- 每段sql语句必须要按规范注释，注释规范如下：
+-- date: 2018-12-11
+-- author: suntg
+-- content: 内容备注xxx
+
+

src/main/resources/META-INF/persistence.xml

@@ -16,7 +16,7 @@
 				to modify an existing database; value="create-drop" means the same as "create" 
 				but also drops tables when Hibernate closes; value="validate" makes no changes 
 				to the database -->
-			<property name="hibernate.hbm2ddl.auto" value="update" />
+			<property name="hibernate.hbm2ddl.auto" value="none" />
 			<property name="hibernate.ejb.naming_strategy" value="org.hibernate.cfg.ImprovedNamingStrategy" />
 			<property name="hibernate.connection.charSet" value="UTF-8" />
 			<!-- Uncomment the following two properties for JBoss only -->