01_8_sql主键生成方式

01_8_sql主键生成方式

1. 配置映射文件

<insert id="insertStudentBySequence" parameterClass="Student">

<selectKey resultClass="int" keyProperty="sid">

select studentPKSequence.nextVal as sid from dual

</selectKey>

insert into Student(sid, name, major, birth, score) values(#sid#, #name#, #major#, #birth#, #score#)

</insert>

2. 实现类的方法

public void addStudentBySequence(Student student) {

try {

sqlMapClient.insert("insertStudentBySequence", student);

} catch (SQLException e) {

e.printStackTrace();

}

}

3. 测试

public static void main(String[] args) {

Student student = new Student();

student.setName("星星");

student.setMajor("数学");

student.setScore(10);

student.setBirth(Date.valueOf("2018-01-1"));

student.setSid(12);

IStudentDAO dao = new IStudentDAOImpl();

dao.addStudentBySequence(student);

for(Student stu : dao.queryAllStudent()) {

System.out.println(stu);

}

}

[sid:1, name:李明, major:语文, birth:Tue Mar 27 00:00:00 CST 2018, score:100.0]

[sid:2, name:可可, major:英语, birth:Mon Mar 12 00:00:00 CST 2018, score:120.0]

[sid:3, name:子浩, major:数学, birth:Thu Jan 25 00:00:00 CST 2018, score:100.0]

[sid:22, name:星星, major:数学, birth:Mon Jan 01 00:00:00 CST 2018, score:10.0]