数据库操作通用类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data;
using System.Configuration;
using System.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;
using System.Collections;

namespace study_MvcApplication.Controllers
{
    //操作SQL SERVER数据库的通用类
    public class DBHelper
    {
        //生成连接字符串
        public SqlConnection GetConn()
        {
            SqlConnection conn = new SqlConnection(System.Configuration.ConfigurationManager.AppSettings["connStr"]);

            return conn;
        }
        //根据SELECT SQL语句，没有参数，返回一个DataTable
        public DataTable GetTable(string sql)
        {
            SqlConnection conn = this.GetConn();
            SqlDataAdapter sda = new SqlDataAdapter(sql, conn);
            DataTable table = new DataTable();
            sda.Fill(table);
            return table;
        }
       //根据SELECT SQL语句，有参数，返回一个DataTable
        public DataTable GetTable(string sql, Hashtable ht)
        {
            SqlConnection conn = this.GetConn();
            SqlDataAdapter sda = new SqlDataAdapter(sql, conn);
            foreach (DictionaryEntry de in ht)
            {
                sda.SelectCommand.Parameters.AddWithValue(de.Key.ToString(), de.Value.ToString());
            }
            DataTable table = new DataTable();
            sda.Fill(table);
            return table;
        }
        //根据SELECT SQL语句，没有参数，返回一个DataRow
        public DataRow GetRow(string sql)
        {
            DataRow row;
            if (this.GetTable(sql).Rows.Count >= 1)
            {
                row = this.GetTable(sql).Rows[0];
            }
            else
            {
                row = null;
            }
            return row;
        }
        //根据SELECT SQL语句，有参数，返回一个DataRow
        public DataRow GetRow(string sql, Hashtable ht)
        {
            DataRow row;
            if (this.GetTable(sql, ht).Rows.Count >= 1)
            {
                row = this.GetTable(sql, ht).Rows[0];
            }
            else
            {
                row = null;
            }
            return row;
        }
        //根据SELECT SQL语句，没有参数，返回首行首列的值
        public string GetValue(string sql)
        {
            string str = "";
            if (this.GetRow(sql) != null)
            {
                str = this.GetRow(sql)[0].ToString();
            }
            return str;
        }
        //根据SELECT SQL语句，有参数，返回首行首列的值
        public string GetValue(string sql, Hashtable ht)
        {
            string str = "";
            if (this.GetRow(sql, ht) != null)
            {
                str = this.GetRow(sql, ht)[0].ToString();
            }
            return str;
        }
        //根据存储过程，没有参数，返回一个DataTable
        public DataTable GetTableByProc(string procName)
        {
            SqlConnection conn = this.GetConn();
            SqlDataAdapter sda = new SqlDataAdapter(procName, conn);
            sda.SelectCommand.CommandType = CommandType.StoredProcedure;
            DataTable table = new DataTable();
            sda.Fill(table);
            return table;
        }
        //根据存储过程，有参数，返回一个DataTable
        public DataTable GetTableByProc(string procName,Hashtable ht)
        {
            SqlConnection conn = this.GetConn();
            SqlDataAdapter sda = new SqlDataAdapter(procName, conn);
            sda.SelectCommand.CommandType = CommandType.StoredProcedure;
            foreach (DictionaryEntry de in ht)
            {
                sda.SelectCommand.Parameters.AddWithValue(de.Key.ToString(), de.Value.ToString());
            }
            DataTable table = new DataTable();
            sda.Fill(table);
            return table;
        }
        //根据存储过程，没有参数，返回一个DataRow
        public DataRow GetRowByProc(string procName)
        {
            DataRow row;
            if (this.GetTableByProc(procName).Rows.Count >= 1)
            {
                row = this.GetTableByProc(procName).Rows[0];
            }
            else
            {
                row = null;
            }
            return row;
        }
        //根据存储过程，有参数，返回一个DataRow
        public DataRow GetRowByProc(string procName,Hashtable ht)
        {
            DataRow row;
            if (this.GetTableByProc(procName,ht).Rows.Count >= 1)
            {
                row = this.GetTableByProc(procName,ht).Rows[0];
            }
            else
            {
                row = null;
            }
            return row;
        }
        //根据存储过程，没有参数，返回首行首列的值
        public string GetValueByProc(string procName)
        {
            string str = "";
            if (this.GetRowByProc(procName) != null)
            {
                str = this.GetRowByProc(procName)[0].ToString();
            }
            return str;
        }
        //根据存储过程，有参数，返回首行首列的值
        public string GetValueByProc(string procName,Hashtable ht)
        {
            string str = "";
            if (this.GetRowByProc(procName,ht) != null)
            {
                str = this.GetRowByProc(procName,ht)[0].ToString();
            }
            return str;
        }
        //普通SQL语句，执行维护操作，没有参数
        public int Execute(string sql)
        {
            SqlConnection conn = this.GetConn();
            conn.Open();
            SqlCommand comm = new SqlCommand(sql, conn);
            int c = comm.ExecuteNonQuery();
            conn.Close();
            return c;

        }
        //普通SQL语句，执行维护操作，有参数
        public int Execute(string sql,Hashtable ht)
        {
            SqlConnection conn = this.GetConn();
            conn.Open();
            SqlCommand comm = new SqlCommand(sql, conn);
            foreach (DictionaryEntry de in ht)
            {
                comm.Parameters.AddWithValue(de.Key.ToString(), de.Value.ToString());
            }
            int c = comm.ExecuteNonQuery();
            conn.Close();
            return c;
        }
        //存储过程，执行维护操作，没有参数
        public int ExecuteProc(string procName)
        {
            SqlConnection conn = this.GetConn();
            conn.Open();
            SqlCommand comm = new SqlCommand(procName, conn);
            comm.CommandType = CommandType.StoredProcedure;
            int c = comm.ExecuteNonQuery();
            conn.Close();
            return c;
        }
        //存储过程，执行维护操作，有参数
        public int ExecuteProc(string procName,Hashtable ht)
        {
            SqlConnection conn = this.GetConn();
            conn.Open();
            SqlCommand comm = new SqlCommand(procName, conn);
            comm.CommandType = CommandType.StoredProcedure;
            foreach (DictionaryEntry de in ht)
            {
                comm.Parameters.AddWithValue(de.Key.ToString(), de.Value.ToString());
            }
            int c = comm.ExecuteNonQuery();
            conn.Close();
            return c;
        }
    }
}