HH.BiDaoDian.Solution/DataBaseHelper/Class_SqlDataBaseHelperService.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 System.Configuration;

namespace DataBaseHelper
{
    public class Class_SqlDataBaseHelperService
    {
        SqlConnection conn = null;
        /// <summary>
        /// SqlDataBaseHelper类的构造函数，创建后自动打开连接
        /// </summary>
        public Class_SqlDataBaseHelperService()
        {
            conn = GetConn();
            conn.Open();
        }
        /// <summary>
        /// 获得配置文件的数据库连接
        /// </summary>
        /// <returns>返回所获得的连接对象并打开连接对象</returns>
        private SqlConnection GetConn()
        {
            //string connStr = "server=.;database=BiDaoDian;uid=sa;pwd=stu";
            string connStr = ConfigurationManager.ConnectionStrings["DBConnStr"].ToString();
            SqlConnection conn = new SqlConnection(connStr);
            return conn;
        }
        /// <summary>
        /// 连接式sql语句的单值查询
        /// </summary>
        /// <param name="sql">所要执行的sql语句</param>
        /// <returns>返回1表示查询成功，0表示失败</returns>
        public int LinkSingleSqlQuery(string sql)
        {
            SqlCommand scm = new SqlCommand(sql, conn);
            return (int)scm.ExecuteScalar();
        }
        /// <summary>
        /// 连接式sql语句的多值查询
        /// </summary>
        /// <param name="sql">所要执行的sql语句</param>
        /// <returns>返回执行后的SqlDataReader对象</returns>
        public SqlDataReader LinkMultiSqlQuery(string sql)
        {
            SqlCommand scm = new SqlCommand(sql, conn);
            return scm.ExecuteReader();
        }
        /// <summary>
        /// 连接式sql语句的增删改操作
        /// </summary>
        /// <param name="sql">所要执行的sql语句</param>
        /// <returns>返回更新成功的行数</returns>
        public int LinkSqlNonQuery(string sql)
        {
            SqlCommand scm = new SqlCommand(sql, conn);