Hibernate 一对多单向关系
业务逻辑：
Teacher 类和 Student 类，假定为一对多的关系，即一个教师有多个学生。
1. 数据库 schema
Teachers 表:
create table TEACHERS
(
ID NUMBER(10) not null,
TEACHERNAME VARCHAR2(15)
)
alter table TEACHERS
add constraint DERE primary key (ID)
Students 表：
create table STUDENTS
(
ID NUMBER(10) not null,
STUDENTNAME VARCHAR2(15),
TEACHER_ID NUMBER(10)
)
alter table STUDENTS
add constraint RERE primary key (ID)
alter table STUDENTS
add constraint FFF foreign key (TEACHER_ID)
references TEACHERS (ID);
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