SQL数据库通用访问类(ASP.NET)

using System;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Collections;

namespace CFCHINA.TOOLS.DataBase
{
    /// <summary>
    /// 通用数据库类
    /// </summary>
    public class DataBase
    {

        private string ConnStr = null;

        /// <summary>
        /// 构架函数（重载，带连接字符串）
        /// </summary>
        /// <returns></returns>
        public DataBase()
        {
            //ConnStr = ConfigurationSettings.AppSettings["ConnStr"];
            ConnStr = ConfigurationManager.ConnectionStrings["connStr"].ToString();
        }

        /// <summary>
        /// 构架函数（重载，带连接字符串）
        /// </summary>
        /// <returns></returns>
        public DataBase(string connStr)
        {
            try
            {
                this.ConnStr = connStr;

            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary>
        /// 返回connection对象
        /// </summary>
        /// <returns></returns>
        public SqlConnection ReturnConn()
        {
            SqlConnection Conn = new SqlConnection(ConnStr);
            Conn.Open();
            return Conn;
        }

        /// <summary>
        /// 释放资源，并回收垃圾
        /// </summary>
        /// <returns></returns>
        public void Dispose(SqlConnection Conn)
        {
            if (Conn != null)
            {
                Conn.Close();
                Conn.Dispose();
            }
            GC.Collect();
        }

        /// <summary>
        /// 生成Command对象
        /// </summary>
        /// <param name="SQL"></param>
        /// <param name="Conn"></param>
        /// <returns></returns>
        public SqlCommand CreateCmd(string SQL, SqlConnection Conn)
        {
            SqlCommand Cmd;
            Cmd = new SqlCommand(SQL, Conn);
            return Cmd;
        }

        /// <summary>
        /// 生成Command对象
        /// </summary>
        /// <param name="SQL"></param>
        /// <returns></returns>
        public SqlCommand CreateCmd(string SQL)
        {
            SqlConnection Conn;
            Conn = new SqlConnection(ConnStr);
            Conn.Open();
            SqlCommand Cmd;
            Cmd = new SqlCommand(SQL, Conn);
            return Cmd;
        }

        /// <summary>
        /// 返回adapter对象
        /// </summary>
        /// <param name="SQL"></param>
        /// <param name="Conn"></param>
        /// <returns></returns>
        public SqlDataAdapter CreateDa(string SQL)
        {
            SqlConnection Conn;
            Conn = new SqlConnection(ConnStr);
            Conn.Open();
            SqlDataAdapter Da;
            Da = new SqlDataAdapter(SQL, Conn);
            return Da;
        }

        /// <summary>
        /// 检验是否存在数据
        /// </summary>
        /// <returns></returns>
        public bool ExistDate(string SQL)
        {
            SqlConnection Conn;
            Conn = new SqlConnection(ConnStr);
            Conn.Open();
            SqlDataReader Dr;
            Dr = CreateCmd(SQL, Conn).ExecuteReader();
            if (Dr.Read())
            {
                Dispose(Conn);
                return true;
            }
            else
            {
                Dispose(Conn);
                return false;
            }
        }

        /// <summary>
        /// 返回SQL语句执行结果的第一行第一列
        /// </summary>
        /// <returns>字符串</returns>
        public string ReturnValue(string SQL)
        {
            SqlConnection Conn;
            Conn = new SqlConnection(ConnStr);
            Conn.Open();
            string result;
            SqlDataReader Dr;
            try
            {
                Dr = CreateCmd(SQL, Conn).ExecuteReader();
                if (Dr.Read())
                {
                    result = Dr[0].ToString();
                    Dr.Close();
                }
                else
                {
                    result = "";
                    Dr.Close();
                }
            }
            catch
            {
                throw new Exception(SQL);
            }
            Dispose(Conn);
            return result;
        }

        /// <summary>
        /// 返回SQL语句第一列,第ColumnI列,
        /// </summary>
        /// <returns>字符串</returns>
        public string ReturnValue(string SQL, int ColumnI)
        {
            SqlConnection Conn;
            Conn = new SqlConnection(ConnStr);
            Conn.Open();
            string result;
            SqlDataReader Dr;
            try
            {
                Dr = CreateCmd(SQL, Conn).ExecuteReader();
            }
            catch
            {
                throw new Exception(SQL);
            }
            if (Dr.Read())
            {
                result = Dr[ColumnI].ToString();
            }
            else
            {
                result = "";
            }
            Dr.Close();
            Dispose(Conn);
            return result;
        }

        /// <summary>
        /// 生成一个存储过程使用的sqlcommand.
        /// </summary>
        /// <param name="procName">存储过程名.</param>
        /// <param name="prams">存储过程入参数组.</param>
        /// <returns>sqlcommand对象.</returns>
        public SqlCommand CreateCmd(string procName, SqlParameter[] prams)
        {
            SqlConnection Conn;
            Conn = new SqlConnection(ConnStr);
            Conn.Open();
            SqlCommand Cmd = new SqlCommand(procName, Conn);
            Cmd.CommandType = CommandType.StoredProcedure;
            if (prams != null)
            {
                foreach (SqlParameter parameter in prams)
                {
                    if (parameter != null)
                    {
                        Cmd.Parameters.Add(parameter);
                    }
                }
            }
            return Cmd;
        }

        /// <summary>
        /// 为存储过程生成一个SqlCommand对象
        /// </summary>
        /// <param name="procName">存储过程名</param>
        /// <param name="prams">存储过程参数</param>
        /// <returns>SqlCommand对象</returns>
        private SqlCommand CreateCmd(string procName, SqlParameter[] prams, SqlDataReader Dr)
        {
            SqlConnection Conn;
            Conn = new SqlConnection(ConnStr);
            Conn.Open();
            SqlCommand Cmd = new SqlCommand(procName, Conn);
            Cmd.CommandType = CommandType.StoredProcedure;
            if (prams != null)
            {
                foreach (SqlParameter parameter in prams)
                    Cmd.Parameters.Add(parameter);
            }
            Cmd.Parameters.Add(
             new SqlParameter("ReturnValue", SqlDbType.Int, 4,
             ParameterDirection.ReturnValue, false, 0, 0,
             string.Empty, DataRowVersion.Default, null));

            return Cmd;
        }
   
        /// <summary>
        /// 运行SQL语句
        /// </summary>
        /// <param name="SQL"></param>
        public void RunSQL(string SQL)
        {
            SqlConnection Conn;
            Conn = new SqlConnection(ConnStr);
            Conn.Open();
            SqlCommand Cmd;
            Cmd = CreateCmd(SQL, Conn);
            try
            {
                Cmd.ExecuteNonQuery();
            }
            catch
            {
                throw new Exception(SQL);
            }
            Dispose(Conn);
            return;
        }

        /// <summary>
        /// 运行SQL语句返回DataReader
        /// </summary>
        /// <param name="SQL"></param>
        /// <returns>SqlDataReader对象.</returns>
        public SqlDataReader RunProc(string SQL)
        {
            SqlConnection Conn;
            Conn = new SqlConnection(ConnStr);
            Conn.Open();
            SqlCommand Cmd;
            Cmd = CreateCmd(SQL, Conn);
            SqlDataReader Dr;
            try
            {
                Dr = Cmd.ExecuteReader(CommandBehavior.Default);
            }
            catch
            {
                throw new Exception(SQL);
            }
            //Dispose(Conn);
            return Dr;
        }

        /// <summary>
        /// 运行SQL语句,返回DataSet对象
        /// </summary>
        /// <param name="procName">SQL语句</param>
        /// <param name="prams">DataSet对象</param>
        public DataSet RunProc(string SQL, DataSet Ds)
        {
            SqlConnection Conn;
            Conn = new SqlConnection(ConnStr);
            Conn.Open();
            SqlDataAdapter Da;
            //Da = CreateDa(SQL, Conn);
            Da = new SqlDataAdapter(SQL, Conn);
            try
            {
                Da.Fill(Ds);
            }
            catch (Exception Err)
            {
                throw Err;
            }
            Dispose(Conn);
            return Ds;
        }

        /// <summary>
        /// 运行SQL语句,返回DataSet对象
        /// </summary>
        /// <param name="procName">SQL语句</param>
        /// <param name="prams">DataSet对象</param>
        /// <param name="dataReader">表名</param>
        public DataSet RunProc(string SQL, DataSet Ds, string tablename)
        {
            SqlConnection Conn;
            Conn = new SqlConnection(ConnStr);
            Conn.Open();
            SqlDataAdapter Da;
            Da = CreateDa(SQL);
            try
            {
                Da.Fill(Ds, tablename);
            }
            catch (Exception Ex)
            {
                throw Ex;
            }
            Dispose(Conn);
            return Ds;
        }

        /// <summary>
        /// 运行SQL语句,返回DataSet对象
        /// </summary>
        /// <param name="procName">SQL语句</param>
        /// <param name="prams">DataSet对象</param>
        /// <param name="dataReader">表名</param>
        public DataSet RunProc(string SQL, DataSet Ds, int StartIndex, int PageSize, string tablename)
        {
            SqlConnection Conn;
            Conn = new SqlConnection(ConnStr);
            Conn.Open();
            SqlDataAdapter Da;
            Da = CreateDa(SQL);
            try
            {
                Da.Fill(Ds, StartIndex, PageSize, tablename);
            }
            catch (Exception Ex)
            {
                throw Ex;
            }
            Dispose(Conn);
            return Ds;
        }

        /// <summary>
        /// 运行存储过程,返回
        /// </summary>
        /// <param name="procName">存储过程名</param>
        /// <param name="prams">存储过程参数</param>
        /// <param name="dataReader">SqlDataReader对象</param>
        public SqlDataReader RunProc(string procName, SqlParameter[] prams, SqlDataReader Dr)
        {

            SqlCommand Cmd = CreateCmd(procName, prams, Dr);
            Dr = Cmd.ExecuteReader(System.Data.CommandBehavior.CloseConnection);
            return Dr;
        }

        /// <summary>
        /// 运行存储过程,返回.
        /// </summary>
        /// <param name="procName">存储过程名</param>
        /// <param name="prams">存储过程参数</param>
        public string RunProc(string procName, SqlParameter[] prams)
        {
            SqlDataReader Dr;
            SqlCommand Cmd = CreateCmd(procName, prams);
            Dr = Cmd.ExecuteReader(System.Data.CommandBehavior.CloseConnection);
            if (Dr.Read())
            {
                return Dr.GetValue(0).ToString();
            }
            else
            {
                return "";
            }
        }

        /// <summary>
        /// 运行存储过程,返回dataset.
        /// </summary>
        /// <param name="procName">存储过程名.</param>
        /// <param name="prams">存储过程入参数组.</param>
        /// <returns>dataset对象.</returns>
        public DataSet RunProc(string procName, SqlParameter[] prams, DataSet Ds)
        {
            SqlCommand Cmd = CreateCmd(procName, prams);
            SqlDataAdapter Da = new SqlDataAdapter(Cmd);
            try
            {
                Da.Fill(Ds);
            }
            catch (Exception Ex)
            {
                throw Ex;
            }
            return Ds;
        }

    }
} 

应用实例:

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.Sql;
using System.Data.SqlClient;
using CFCHINA.TOOLS.DataBase;

public partial class _Default : System.Web.UI.Page
{
protected DataBase mydb = null;
protected SqlConnection conn = null;

protected void Page_Load(object sender, EventArgs e)
{
try
{
mydb = new DataBase();
conn = mydb.ReturnConn();//取得数据库连接

//DataSet ds = new DataSet();

//运行Sql语句，得到dataset
//ds = mydb.RunProc("Select * FROM CF_CLASS", ds);


//运行Sql语句，得到SqlDataReader
//SqlDataReader sdr = mydb.RunProc("select * from cf_class");

//演示如何使用参数数组
SqlParameter[] myparams = new SqlParameter[1];
myparams[0] = new SqlParameter("@id", SqlDbType.Int, 4);
myparams[0].Value = 47;

//运行存储过程，返回dataset
//ds = mydb.RunProc("up_Class_GetAllChildByID", myparams, ds);

//运行存储过程，返回DataReader
SqlDataReader sdr = null;
sdr = mydb.RunProc("up_Class_GetAllChildByID", myparams, sdr);


//绑定
//GridView1.DataSource = ds;
GridView1.DataSource = sdr;
GridView1.DataBind();
}

catch ( Exception ex)
{
Response.Write("<script>alert('错误:/n" + ex.Message.ToString() + "');</script>");
Response.End();
}

finally
{
//释放资源
mydb.Dispose(conn);
}


}
}
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