updatechengjiaction.java

java(Swing) access做的成绩管理系统

package edu.xscj.action;

import java.sql.Connection;
import edu.xscj.conn.ConnectDataBase;
import java.sql.PreparedStatement;
import edu.xscj.bean.Chengji;

public class UpdateChengjiAction {
    Connection conn = null;
    public UpdateChengjiAction() {
        if (conn == null) {
            conn = ConnectDataBase.getConn();
        }
    }

    public void setConn() {
        if (conn == null) {
            conn = ConnectDataBase.getConn();
        }
    }

    public String updateChengji(Chengji chengji) {
        PreparedStatement pstmt = null;
        String str = "";
        try {
            if (conn == null) {
                this.setConn();
            }
            pstmt = conn.prepareStatement(
                    "update chengji set  stuCourGrade=? where stuNo=? and courNo=?");
            pstmt.setInt(1, chengji.getStuCourGrade());
            pstmt.setString(2, chengji.getStuNo());
            pstmt.setString(3, chengji.getCourNo());
            pstmt.execute();
            str = "sucess";
        } catch (Exception ex) {
            ex.printStackTrace();
            str = "failer";
        } finally {
            try {
                if (pstmt != null) {
                    pstmt.close();
                }
                if (conn != null) {
                    conn.close();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return str;
    }
}