ejb连接数据库，可以完成增删改查等操作，无须在使用繁琐的代码-ejb connect to the database, you can check the completion of operations such as additions and deletions to change, no need to use the complicated code

java 数据库连接 通用的增、删、改、查及异常处理 只用设置sql参数和sql语句-select update insert