怎么把arraylist中的所有对象插入到数据库中

public class TeaCourseAdd {
private String teacherid;
private String course[];
public String execute()
{ List teacourselist=new ArrayList();
int i;
for(i=0;i {Teacher teacher=new Teacher();
Course course=new Course();
teacher.setTeacherid(getTeacherid());
course.setCourseid(getCourse()[i]);
TeacourseId teacourseid=new TeacourseId();
teacourseid.setCourse(course);
teacourseid.setTeacher(teacher);
Teacourse teacourse=new Teacourse();
teacourse.setId(teacourseid);
teacourselist.add(teacourse);
}

for(i=0;i {
TeaCourseOp teacourseop=new TeaCourseOp();
teacourseop.addsteacourse(geta);//到这就不会了
}
return "success";
}

为了避免多次进行数据库操作，使用批处理，即如下的代码：
String sql = "insert into employee (name, city, phone) values (?, ?, ?)";

Connection connection = new getConnection();

PreparedStatement ps = connection.prepareStatement(sql);

final int batchSize = 1000;

int count = 0;

for (Employee employee: employees) {

    ps.setString(1, employee.getName());

    ps.setString(2, employee.getCity());

    ps.setString(3, employee.getPhone());

    ps.addBatch();

    if(++count % batchSize == 0) {

        ps.executeBatch();

    }

}

ps.executeBatch(); // insert remaining records

ps.close();

connection.close();

虽然我很聪明，但这么说真的难到我了