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学生成绩管理系统

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jiandan 2 days ago
commit 79a78869c4
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134
src/com/lizhou/service/ClazzService.java
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package com.lizhou.service;
import java.sql.Connection;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import com.lizhou.bean.Clazz;
import com.lizhou.bean.Grade;
import com.lizhou.bean.Page;
import com.lizhou.bean.Student;
import com.lizhou.dao.impl.BaseDaoImpl;
import com.lizhou.dao.impl.ClazzDaoImpl;
import com.lizhou.dao.inter.BaseDaoInter;
import com.lizhou.dao.inter.ClazzDaoInter;
import com.lizhou.tools.MysqlTool;
import com.lizhou.tools.StringTool;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import net.sf.json.JsonConfig;
/**
* 年级服务层
* @author bojiangzhou
*
*/
public class ClazzService {
ClazzDaoInter dao = new ClazzDaoImpl();
/**
* 获取指定年级下的班级
* @param gid 年级ID
* @return JSON格式的班级
*/
public String getClazzList(String gradeid){
int id = Integer.parseInt(gradeid);
//获取数据
List<Object> list = dao.getList(Clazz.class, "SELECT * FROM clazz WHERE gradeid=?", new Object[]{id});
//json化
JsonConfig config = new JsonConfig();
config.setExcludes(new String[]{"grade", "studentList"});
String result = JSONArray.fromObject(list, config).toString();
return result;
}
/**
* 获取班级详细信息
* @param gradeid
* @param page
* @return
*/
public String getClazzDetailList(String gradeid, Page page) {
//获取数据
List<Clazz> list = dao.getClazzDetailList(gradeid, page);
//获取总记录数
long total = 0;
if(!StringTool.isEmpty(gradeid)){
int gid = Integer.parseInt(gradeid);
total = dao.count("SELECT COUNT(*) FROM clazz WHERE gradeid=?", new Object[]{gid});
} else {
total = dao.count("SELECT COUNT(*) FROM clazz", new Object[]{});
}
//定义Map
Map<String, Object> jsonMap = new HashMap<String, Object>();
//total键 存放总记录数，必须的
jsonMap.put("total", total);
//rows键 存放每页记录 list
jsonMap.put("rows", list);
//格式化Map,以json格式返回数据
String result = JSONObject.fromObject(jsonMap).toString();
return result;
}
/**
* 添加班级
* @param name
* @param gradeid
*/
public void addClazz(String name, String gradeid) {
int gid = Integer.parseInt(gradeid);
dao.insert("INSERT INTO clazz(name, gradeid) value(?,?)", new Object[]{name, gid});
}
/**
* 删除班级
* @param clazzid
* @throws Exception
*/
public void deleteClazz(int clazzid) throws Exception {
//获取连接
Connection conn = MysqlTool.getConnection();
try {
//开启事务
MysqlTool.startTransaction();
//删除成绩表
dao.deleteTransaction(conn, "DELETE FROM escore WHERE clazzid=?", new Object[]{clazzid});
//删除考试记录
dao.deleteTransaction(conn, "DELETE FROM exam WHERE clazzid=?", new Object[]{clazzid});
//删除用户
List<Object> list = dao.getList(Student.class, "SELECT number FROM student WHERE clazzid=?", new Object[]{clazzid});
if(list.size() > 0){
Object[] param = new Object[list.size()];
for(int i = 0;i < list.size();i++){
Student stu = (Student) list.get(i);
param[i] = stu.getNumber();
}
String sql = "DELETE FROM user WHERE account IN ("+StringTool.getMark(list.size())+")";
dao.deleteTransaction(conn, sql, param);
//删除学生
dao.deleteTransaction(conn, "DELETE FROM student WHERE clazzid=?", new Object[]{clazzid});
}
//删除班级的课程和老师的关联
dao.deleteTransaction(conn, "DELETE FROM clazz_course_teacher WHERE clazzid=?", new Object[]{clazzid});
//最后删除班级
dao.deleteTransaction(conn, "DELETE FROM clazz WHERE id=?", new Object[]{clazzid});
//提交事务
MysqlTool.commit();
} catch (Exception e) {
//回滚事务
MysqlTool.rollback();
e.printStackTrace();
throw e;
} finally {
MysqlTool.closeConnection();
}
}
}

96
src/com/lizhou/service/CourseService.java
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package com.lizhou.service;
import java.sql.Connection;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import com.lizhou.bean.Clazz;
import com.lizhou.bean.Course;
import com.lizhou.bean.Grade;
import com.lizhou.bean.Page;
import com.lizhou.bean.Student;
import com.lizhou.dao.impl.BaseDaoImpl;
import com.lizhou.dao.impl.ClazzDaoImpl;
import com.lizhou.dao.inter.BaseDaoInter;
import com.lizhou.dao.inter.ClazzDaoInter;
import com.lizhou.tools.MysqlTool;
import com.lizhou.tools.StringTool;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import net.sf.json.JsonConfig;
/**
* 课程服务层
* @author bojiangzhou
*
*/
public class CourseService {
BaseDaoInter dao = new BaseDaoImpl();
/**
* 获取所有课程
* @return
*/
public String getCourseList(String gradeid){
List<Object> list;
if(StringTool.isEmpty(gradeid)){
list = dao.getList(Course.class, "SELECT * FROM course");
} else{
list = dao.getList(Course.class,
"SELECT c.* FROM course c, grade_course gc WHERE c.id=gc.courseid AND gc.gradeid=?",
new Object[]{Integer.parseInt(gradeid)});
}
//json化
String result = JSONArray.fromObject(list).toString();
return result;
}
/**
* 添加课程
* @param course
*/
public void addCourse(Course course) {
dao.insert("INSERT INTO course(name) value(?)", new Object[]{course.getName()});
}
/**
* 删除课程
* @param courseid
* @throws Exception
*/
public void deleteClazz(int courseid) throws Exception {
//获取连接
Connection conn = MysqlTool.getConnection();
try {
//开启事务
MysqlTool.startTransaction();
//删除成绩表
dao.deleteTransaction(conn, "DELETE FROM escore WHERE courseid=?", new Object[]{courseid});
//删除班级的课程和老师的关联
dao.deleteTransaction(conn, "DELETE FROM clazz_course_teacher WHERE courseid=?", new Object[]{courseid});
//删除年级与课程关联
dao.deleteTransaction(conn, "DELETE FROM grade_course WHERE courseid=?", new Object[]{courseid});
//最后删除课程
dao.deleteTransaction(conn, "DELETE FROM course WHERE id=?", new Object[]{courseid});
//提交事务
MysqlTool.commit();
} catch (Exception e) {
//回滚事务
MysqlTool.rollback();
e.printStackTrace();
throw e;
} finally {
MysqlTool.closeConnection();
}
}
}
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