C# ADO.NET帮助类

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Data.SqlClient;

namespace DBComm
{
    static class DBCommand
    {
        public class DBParameters
        {
            private SqlCommand m_owner = null;
            public DBParameters(SqlCommand owner)
            {
                m_owner = owner;
            }
            public SqlParameterCollection P()
            {
                return m_owner.Parameters;
            }
        };

        public static bool BulkToDB(string tabname, DataTable dt, params string[] destColumnNames)
        {
            bool bRet = false;
            do
            {
                    if (dt == null)
                        break;
                    if (dt.Rows.Count == 0)
                        break;
                    using (SqlConnection conn = DBConn.GetConn())
                    {
                        if (conn == null)
                            break;

                        SqlBulkCopy bulkcopy = new SqlBulkCopy(conn);
                        if (bulkcopy == null)
                            break;

                        bulkcopy.DestinationTableName = tabname;
                        bulkcopy.BulkCopyTimeout = 30;
                        if (destColumnNames.Length == 0)
                        {
                            foreach (DataColumn col in dt.Columns)
                                bulkcopy.ColumnMappings.Add(col.ColumnName, col.ColumnName);
                        }
                        else
                        {
                            if (destColumnNames.Length == dt.Columns.Count)
                            {
                                for (int i = 0; i < destColumnNames.Length; ++i)
                                {
                                    bulkcopy.ColumnMappings.Add(dt.Columns[i].ColumnName, destColumnNames[i]);
                                }
                            }
                        }
                        bulkcopy.BatchSize = dt.Rows.Count;
                        try
                        {
                            bulkcopy.WriteToServer(dt);
                        }
                        catch (System.Exception e)
                        {
                            string err = e.Message;
                            break;
                        }
                        finally
                        {
                            bulkcopy.Close();
                        }
                    }
                    bRet = true;
            } while (false);
            return bRet;
        }

        public static DBParameters ExecProcNonQuery(string proc_name, object[] paraValues)
        {
            using (SqlConnection conn = DBConn.GetConn())
            {
                SqlCommand cmd = new SqlCommand();
                cmd.Connection = conn;
                cmd.CommandType = CommandType.StoredProcedure;
                cmd.CommandText = proc_name;

                AddInParaValues(cmd, paraValues);
                cmd.ExecuteNonQuery();

                return new DBParameters(cmd);
            }
        }

        public delegate T[] FillValues<T>(SqlDataReader reader);

        public static T[] QuerySomes<T>(string sql, FillValues<T> fill)
        {
            using (SqlConnection conn = DBConn.GetConn())
            {
                T[] result = null;
                SqlCommand cmd = new SqlCommand();
                cmd.Connection = conn;
                cmd.CommandText = sql;


                SqlDataReader reader = null;
                lock (reader = cmd.ExecuteReader())
                {
                    try
                    {
                        result = fill(reader);
                    }
                    catch (Exception e)
                    {
                        throw new Exception(e.StackTrace);
                    }
                    finally
                    {
                        reader.Close();
                    }
                }
                return result;
            }
        }

        public delegate object FillValue(SqlDataReader reader);

        public static object QuerySome(string sql, FillValue fill)
        {
            using (SqlConnection conn = DBConn.GetConn())
            {
                object result = null;
                SqlCommand cmd = new SqlCommand();
                cmd.Connection = conn;
                cmd.CommandText = sql;
                SqlDataReader reader = null;
                lock (reader = cmd.ExecuteReader())
                {
                    try
                    {
                        result = fill(reader);
                    }
                    catch (Exception e)
                    {
                        throw new Exception(e.StackTrace);
                    }
                    finally
                    {
                        reader.Close();
                    }
                }
                return result;
            }
        }

        public static object FillResultValue(SqlDataReader reader)
        {
            object o = null;
            if (reader.Read())
            {
                o = reader.GetValue(0);
            }
            return o;
        }

        public static bool QueryBoolean(string sql)
        {
            return Convert.ToBoolean(QuerySome(sql, new FillValue(FillResultValue)));
        }

        public static byte[] QueryBytes(string sql)
        {
            return (byte[])(QuerySome(sql, new FillValue(FillResultValue)));
        }

        public static int QueryInteger(string sql)
        {
            return Convert.ToInt32(QuerySome(sql, new FillValue(FillResultValue)));
        }


        public static string QueryStr(string sql)
        {
            return QuerySome(sql, new FillValue(FillResultValue)) as string;
        }

        private static string[] FillStrsValue(SqlDataReader reader)
        {
            List<string> lststr = new List<string>();
            while (reader.Read())
            {
                lststr.Add(reader.GetString(0));
            }
            return lststr.ToArray();
        }

        public static string[] QueryStrs(string sql)
        {
            return QuerySomes(sql, new FillValues<string>(FillStrsValue));
        }

        private static bool[] FillBooleansValue(SqlDataReader reader)
        {
            List<bool> lstbool = new List<bool>();
            while (reader.Read())
            {
                lstbool.Add(reader.GetBoolean(0));
            }
            return lstbool.ToArray();
        }

        public static bool[] QueryBooleans(string sql)
        {
            return QuerySomes(sql, new FillValues<bool>(FillBooleansValue));
        }

        public static void ExecCmd(string sql)
        {
            using (SqlConnection conn = DBConn.GetConn())
            {
                SqlCommand cmd = new SqlCommand();
                cmd.Connection = conn;
                cmd.CommandText = sql;
                cmd.ExecuteNonQuery();
            }
        }
        /// <summary>
        /// 获取存储过程的参数列表
        /// </summary>
        /// <param name="proc_Name">存储过程名称</param>
        /// <returns>DataTable</returns>
        private static DataTable GetParameters(SqlConnection conn, string proc_Name)
        {
            SqlCommand comm = new SqlCommand("dbo.sp_sproc_columns", conn);
            comm.CommandType = CommandType.StoredProcedure;
            comm.Parameters.AddWithValue("@procedure_name", (object)proc_Name);
            SqlDataAdapter sda = new SqlDataAdapter(comm);
            DataTable dt = new DataTable();
            sda.Fill(dt);
            return dt;
        }
        /// <summary>
        /// 为 SqlCommand 添加参数及赋值
        /// </summary>
        /// <param name="comm">SqlCommand</param>
        /// <param name="paraValues">参数数组(必须遵循存储过程参数列表的顺序)</param>
        private static void AddInParaValues(SqlCommand comm, params object[] paraValues)
        {
            using (SqlConnection conn = DBConn.GetConn())
            {
                comm.Parameters.Add(new SqlParameter("@RETURN_VALUE", SqlDbType.Int));
                comm.Parameters["@RETURN_VALUE"].Direction = ParameterDirection.ReturnValue;
                if (paraValues != null)
                {
                    DataTable dt = GetParameters(conn, comm.CommandText);
                    int i = 0;
                    foreach (DataRow row in dt.Rows)
                    {
                        string key = row[3].ToString();
                        if (key != "@RETURN_VALUE")
                        {
                            int value = int.Parse(row[4].ToString());
                            if (value == 1)
                            {
                                comm.Parameters.AddWithValue(key, paraValues[i]);
                            }
                            else if (value == 2)//value为2则是输出参数
                            {
                                comm.Parameters.AddWithValue(key, paraValues[i]).Direction = ParameterDirection.Output;
                                //comm.Parameters[key].Direction = ParameterDirection.Output;
                            }
                            comm.Parameters[key].Size = Convert.ToInt32(row[7].ToString());
                            i++;
                        }
                    }
                }
            }
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;

namespace DBComm
{
    class DBConn
    {
        private static string m_connstr;

        public static string ConnString
        {
            get { return m_connstr; }
            private set { m_connstr = value; }
        }

        static DBConn() 
        {
            SqlConnectionStringBuilder connStr = new SqlConnectionStringBuilder();
            connStr.DataSource = ".";
            connStr.InitialCatalog = "test";
            connStr.IntegratedSecurity = true;

            connStr.Pooling = true; //开启连接池
            connStr.MinPoolSize = 0; //设置最小连接数为0
            connStr.MaxPoolSize = 100; //设置最大连接数为100             
            connStr.ConnectTimeout = 10; //设置超时时间为10秒

            ConnString = connStr.ConnectionString;
            //ConnectDB(ConnString);
        }

        public static SqlConnection GetConn()
        {
            SqlConnection conn = new SqlConnection(ConnString);
            conn.Open();
            return conn;
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;
using System.Data;

namespace DBComm
{
    static class DBTableSource
    {
        public static DataTable GetSource(SqlConnection conn, string strsql)
        {
            DataTable dt = null;
            SqlCommand cmd = null;
            SqlDataAdapter ad = null;
            try
            {
                lock (dt = new DataTable())
                {
                    if (conn is SqlConnection)
                    {
                        cmd = new SqlCommand(strsql, conn);
                        ad = new SqlDataAdapter((SqlCommand)cmd);
                    }

                    dt.Clear();
                    ad.Fill(dt);
                }
            }
            catch (Exception e)
            {
                throw e;
            }
            return dt;
        }

        public static DataTable Source(string strsql)
        {
            using (SqlConnection conn = DBConn.GetConn())
            {
                return GetSource(conn, strsql);
            }
        }
    }
}

C# ADO.NET帮助类

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原文地址：http://blog.csdn.net/longhaoyou/article/details/39102607