2020/10/29

一.在这里写几个关于dao的语句

public boolean add(student s) {
        String sql = "insert into text3(sid,sname,ssex,sclass,szy) values('"+ s.getSid() + "','"+ s.getSname() + "','"+s.getSsex() + "','" + s.getSclass() + "','" + s.getSzy() +"')";
        Connection conn = DBUtil.getConn();
        Statement state = null;
        boolean f = false;
        int a = 1;
         
        try {
            state = conn.createStatement();
            state.executeUpdate(sql);
        } catch (Exception e) {
            e.printStackTrace();
            a=0;
        } finally {
            DBUtil.close(state, conn);
        }
         
        if (a > 0) {
            f = true;
        }
        return f;
	}

 这是一个添加的sql的语句

insert into text3(sid,sname,ssex,sclass,szy) values('"+ s.getSid() + "','"+ s.getSname() + "','"+s.getSsex() + "','" + s.getSclass() + "','" + s.getSzy() +"')";
使用该条语句可以添加数据

 public boolean tsan(String x) {
    	
        String sql="delete from text2 where tname='"+x+"'";
        Connection conn = DBUtil.getConn();
        Statement state = null;
        boolean f = false;
        int a = 1;
         
        try {
            state = conn.createStatement();
            state.executeUpdate(sql);
        } catch (Exception e) {
            e.printStackTrace();
            a=0;
        } finally {
            DBUtil.close(state, conn);
        }
         
        if (a > 0) {
            f = true;
        }
        return f;
    }

 使用该条语句是可以删除数据，将要删除的东西传入函数就可将他一行的删去

二.除了sql语句其他部分还不太了解

三.web