js成绩管理系统源代码

package classman;
import db.dbconn;
import util.stringUtil;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.Statement;
import java.sql.ResultSet;
/**
 * 封装对班级表的所有操作
 * @author 邓子云
 */
public class class_operation{
   /**
    * 功能:往班级表增加一条记录
    * 输入参数:class_name为班级名称
    * 输出:返回1表成功，返回2表数据连接参数配置不正确或连接数据库失败或数据库操作失败，
    * 返回3表此班级已存在，返回4表输入参数class_name为空;
    */
   public int class_add_one（String class_name）{
       dbconn dbconnobject=new dbconn（）;//数据库连接对象
       String sqlString=null;//SQL语句字符串
       ResultSet rs=null;//结果记录集
       Connection dbconn=dbconnobject.getDBConn（）;//得到数据库连接
       if（dbconn==null） return 2;//连接失败
       //--------输入参数不正确---------
       if（class_name==null||class_name.trim（）.length（）==0）
          return 4;
       //--------输入参数编码转换-------
       stringUtil stringCode=new stringUtil（）;
       class_name=stringCode.codeToString（class_name.trim（））;
       //--------插入记录，先判断是否已存在------
       sqlString=“select * from class where class_name=?“;
       try{
          PreparedStatement preSQLSelect=dbconn.prepareStatement（sqlString）;
          preSQLSelect.setString（1class_name）;
          rs=preSQLSelect.executeQuery（）;
          if（rs.next（）） return 3;//已存在此班级
          sqlString=“insert into class（class_name） values（?）“;
          PreparedStatement preSQLInsert=dbconn.prepareStatement（sqlString）;
          preSQLInsert.setString（1class_name）;
          preSQLInsert.executeUpdate（）;
          return 1;
        }catch（Exception e）{
          System.out.print（e）;
          return 2;
        }             
   }
   /**
    * 功能:查询出所有的班级
    * 输入参数：无
    * 输出:所有班级的记录集如果没有记录或操作失败返回null
    */
   public ResultSet class_select_all（）{
       String sqlString=null;//SQL语句字符串
       Statement sql=null;//SQL语句对象
       ResultSet rs=null;//结果记录集
       dbconn dbconnobject=new dbconn（）;//数据库连接对象
       Connection dbconn=dbconnobject.getDBConn（）;//得到数据库连接
       if（dbconn==null） return null;//连接失败
       try{
          //-------查询出数据------------
          sqlString=“select * from class“; 
          sql=dbconn.createStatement（ResultSet.TYPE_SCROLL_SENSITIVE ResultSet.CONCUR_READ_ONLY）;
          rs=sql.executeQuery（sqlString）;
          return rs;
       }catch（Exception e）{
          System.out.print（e）;
          return null;
       }  
   }
   /**
    * 功能：删除一个班级的信息
    * 输入参数：班级的ID号
    * 输出：返回1表成功，返回2表数据连接参数配置不正确或连接数据库失败，
    * 返回4表输入参数class_id为0，即输入参数不正确
    */
   public int class_delete（int class_id）{
       String sqlString=null;//SQL语句字符串
       ResultSet rs=null;//结果记录集
       dbconn dbconnobject=new dbconn（）;//数据库连接对象
       Connection dbconn=dbconnobject.getDBConn（）;//得到数据库连接
       if（dbconn==null） return 2;//连接失败
       if（class_id==0） return 4;//输入参数不正确
       //---------删除数据--------------
       sqlString=“delete from class where class_id=?“;
       try{
           PreparedStatement preSQLDelete=dbco

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2012-06-15 09:25  chengji
     目录           0  2012-11-19 09:56  chengjichengji
     文件        1054  2012-11-19 10:51  chengjichengji.classpath
     目录           0  2014-07-03 11:19  chengjichengji.myeclipse
     文件         294  2012-11-19 09:56  chengjichengji.mymetadata
     文件        1225  2007-12-03 10:07  chengjichengji.project
     目录           0  2012-11-19 09:56  chengjichengjiWebRoot
     目录           0  2012-11-19 09:56  chengjichengjiWebRootmeta-INF
     文件          39  2007-12-03 10:02  chengjichengjiWebRootmeta-INFMANIFEST.MF
     目录           0  2012-11-19 09:56  chengjichengjiWebRootWEB-INF
     文件       10763  2007-12-03 10:01  chengjichengjiWebRootWEB-INFc-1_0-rt.tld
     文件       11310  2007-12-03 10:01  chengjichengjiWebRootWEB-INFc-1_0.tld
     文件       15999  2007-12-03 10:01  chengjichengjiWebRootWEB-INFc.tld
     目录           0  2012-11-19 10:51  chengjichengjiWebRootWEB-INFclasses
     目录           0  2002-01-01 01:09  chengjichengjiWebRootWEB-INFclassesclassman
     文件        3683  2002-01-01 01:09  chengjichengjiWebRootWEB-INFclassesclassmanclass_operation.class
     目录           0  2002-01-01 01:09  chengjichengjiWebRootWEB-INFclassescore
     文件        8256  2002-01-01 01:09  chengjichengjiWebRootWEB-INFclassescorecore_operation.class
     目录           0  2002-01-01 01:09  chengjichengjiWebRootWEB-INFclassesdb
     文件        2264  2002-01-01 01:09  chengjichengjiWebRootWEB-INFclassesdbdbconn.class
     文件         164  2012-11-19 10:51  chengjichengjiWebRootWEB-INFclassesdbconn.properties
     目录           0  2002-01-01 01:09  chengjichengjiWebRootWEB-INFclasseslessionman
     文件        4340  2002-01-01 01:09  chengjichengjiWebRootWEB-INFclasseslessionmanclasslession_operation.class
     文件        3737  2002-01-01 01:09  chengjichengjiWebRootWEB-INFclasseslessionmanlession_operation.class
     目录           0  2002-01-01 01:09  chengjichengjiWebRootWEB-INFclassespic
     文件        2208  2002-01-01 01:09  chengjichengjiWebRootWEB-INFclassespiccorePieChart.class
     目录           0  2002-01-01 01:09  chengjichengjiWebRootWEB-INFclassesstudentman
     文件        4752  2002-01-01 01:09  chengjichengjiWebRootWEB-INFclassesstudentmanstudent_operation.class
     目录           0  2002-01-01 01:09  chengjichengjiWebRootWEB-INFclasses eacherman
     文件        4196  2002-01-01 01:09  chengjichengjiWebRootWEB-INFclasses eacherman eacher_operation.class
     目录           0  2002-01-01 01:09  chengjichengjiWebRootWEB-INFclasses eachlessionman
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