WELOA.DAL/WEL/ls_staffDAO.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;
using System.Data;
using WELOA.Model;
using System.Configuration;

namespace LSDAL_SQL
{
public class ls_staffDAO
{
    
    private SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["lsstring"].ConnectionString);
    private DateSetInformation dsinfo = new DateSetInformation();
    private ls_exception exlog = new ls_exception();
    private ls_publicclass publicclassDAO = new ls_publicclass();
    private ls_stafflogDAO stafflogDAO = new ls_stafflogDAO();
    private Polytechnic trinfo = new Polytechnic();

    
    public Polytechnic delstaff(int nid)
    {
        this.trinfo.nException = -1;
        this.trinfo.rowsnum = -1;
        SqlCommand command = this.conn.CreateCommand();
        command.CommandType = CommandType.Text;
        command.CommandText = "DELETE ls_staff WHERE id=@nid";
        command.Parameters.AddWithValue("@nid", nid);
        try
        {
            if (this.conn.State == ConnectionState.Closed)
            {
                this.conn.Open();
            }
            this.trinfo.rowsnum = command.ExecuteNonQuery();
            this.conn.Close();
        }
        catch (Exception exception)
        {
            this.exlog.insexception("ls_staffDAO.cs delstaff", exception.Message);
            this.trinfo.nException = 1;
            return this.trinfo;
        }
        return this.trinfo;
    }

    public Polytechnic delstaff(int nIdStar, int nIdEnd, string strStaff)
    {
        this.trinfo.nException = -1;
        this.trinfo.rowsnum = -1;
        string str = "(([证件号]='" + strStaff + "') OR ([登录名]='" + strStaff + "') OR ([姓名] LIKE '%" + strStaff + "%') )";
        SqlCommand command = this.conn.CreateCommand();
        command.CommandType = CommandType.Text;
        command.CommandText = "DELETE ls_staff  where id>=@nIdStar AND id<=@nIdEnd AND " + str + " ";
        command.Parameters.AddWithValue("@nIdStar", nIdStar);
        command.Parameters.AddWithValue("@nIdEnd", nIdEnd);
        try
        {