.Net SqlDbHelper

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

namespace ExamDAL
{
    class SqHelper
    {
        #region 属性区

        // 连接字符串
        private static string strConn;

        public static string StrConn
        {
            get
            {
                return ConfigurationManager.ConnectionStrings["Exam"].ConnectionString;
            }
        }

        #endregion

        #region 方法区

        #region 获取受影响的行数

        /// 执行非查询存储过程和SQL语句
        /// 增、删、改
        /// </summary>
        /// <param name="strSQL">要执行的SQL语句</param>
        /// <param name="cmdType">Command类型</param>
        /// <param name="paras">参数列表，没有参数填入null</param>
        /// <returns>返回影响行数</returns>
        public static int ExcuteSQL(string strSQL, CommandType cmdType, params SqlParameter[] paras)
        {
            int count = 0;
            using (SqlConnection conn = new SqlConnection(StrConn))
            {
                SqlCommand cmd = new SqlCommand(strSQL, conn);
                cmd.CommandType = cmdType;
                if (paras != null)
                {
                    cmd.Parameters.AddRange(paras);
                }
                conn.Open();
                count = cmd.ExecuteNonQuery();
                conn.Close();
            }
            return count;

        }

        /// <summary>
        /// 执行没有参数的SQL的语句
        /// </summary>
        /// <param name="strSQL">执行SQL</param>
        /// <returns>受影响的行数</returns>
        public static int ExcuteSQL(string strSQL)
        {
            return ExcuteSQL(strSQL, null);
        }

        /// <summary>
        /// 执行有参数的SQL的语句
        /// </summary>
        /// <param name="strSQL">执行SQL</param>
        /// <param name="paras">参数</param>
        /// <returns>受影响的行数</returns>
        public static int ExcuteSQL(string strSQL, SqlParameter[] paras)
        {
            return ExcuteSQL(strSQL, CommandType.Text, paras);
        }

        /// <summary>
        /// 执行没有参数的存储过程
        /// </summary>
        /// <param name="ProcName">存储过程名称</param>
        /// <returns>受影响的行数</returns>
        public static int ExcuteProc(string ProcName)
        {
            return ExcuteSQL(ProcName, CommandType.StoredProcedure);
        }

        /// <summary>
        /// 执行有参数的存储过程
        /// </summary>
        /// <param name="ProcName">存储过程名称</param>
        /// <param name="pars">参数</param>
        /// <returns>受影响的行数</returns>
        public static int ExcuteProc(string ProcName, SqlParameter[] pars)
        {
            return ExcuteSQL(ProcName, CommandType.StoredProcedure, pars);
        }

        #endregion

        #region 获取第一行第一列的值

        /// <summary>
        /// 执行SQL语句，返回首行首列
        /// </summary>
        /// <param name="strSQL">要执行的SQL语句</param>
        /// <param name="cmdtype">执行的类型</param>
        /// <param name="paras">参数列表，没有参数填入null</param>
        /// <returns>返回的首行首列</returns>
        public static object GetObject(string strSQL, CommandType cmdtype, params SqlParameter[] paras)
        {
            object obj = null;
            using (SqlConnection conn = new SqlConnection(StrConn))
            {
                SqlCommand cmd = new SqlCommand(strSQL, conn);
                cmd.CommandType = cmdtype;
                if (paras != null)
                {
                    cmd.Parameters.AddRange(paras);

                }

                conn.Open();
                obj = cmd.ExecuteScalar();
                conn.Close();
            }
            return obj;
        }

        /// <summary>
        /// 根据sql语句获取单个值
        /// </summary>
        /// <param name="strSQL"></param>
        /// <returns></returns>
        public static object GetObject(string strSQL)
        {
            return GetObject(strSQL, null);
        }

        /// <summary>
        /// 根据sql语句 和 参数数组获取单个值
        /// </summary>
        /// <param name="strSQL"></param>
        /// <param name="paras"></param>
        /// <returns></returns>
        public static object GetObject(string strSQL, SqlParameter[] paras)
        {
            return GetObject(strSQL, CommandType.Text, paras);
        }

        /// <summary>
        /// 调用不带参数的存储过程获取单个值
        /// </summary>
        /// <param name="ProcName"></param>
        /// <returns></returns>
        public static object GetObjectByProc(string ProcName)
        {
            return GetObjectByProc(ProcName);
        }

        /// <summary>
        /// 调用带参数的存储过程获取单个值
        /// </summary>
        /// <param name="ProcName"></param>
        /// <param name="paras"></param>
        /// <returns></returns>
        public static object GetObjectByProc(string ProcName, params SqlParameter[] paras)
        {
            return GetObject(ProcName, CommandType.StoredProcedure, paras);
        }

        #endregion

        #region 获取DataReader

        /// <summary>
        /// 根据sql语句返回DataReader对象
        /// </summary>
        /// <param name="strSQL">sql语句</param>
        /// <returns>DataReader对象</returns>
        public static SqlDataReader GetReader(string strSQL)
        {
            return GetReader(strSQL, null);
        }

        /// <summary>
        /// 根据sql语句和参数返回DataReader对象
        /// </summary>
        /// <param name="strSQL">sql语句</param>
        /// <param name="paras">参数数组</param>
        /// <returns>DataReader对象</returns>
        public static SqlDataReader GetReader(string strSQL, params SqlParameter[] paras)
        {
            return GetReader(strSQL, CommandType.Text, paras);
        }

        /// <summary>
        /// 调用不带参数的存储过程，返回DataReader对象
        /// </summary>
        /// <param name="procName">存储过程名称</param>
        /// <returns>DataReader对象</returns>
        public static SqlDataReader GetReaderByProc(string procName)
        {
            return GetReaderByProc(procName);
        }

        /// <summary>
        /// 调用带有参数的存储过程，返回DataReader对象
        /// </summary>
        /// <param name="procName">存储过程名</param>
        /// <param name="paras">参数数组</param>
        /// <returns>DataReader对象</returns>
        public static SqlDataReader GetReaderByProc(string procName, params SqlParameter[] paras)
        {
            return GetReader(procName, CommandType.StoredProcedure, paras);
        }

        /// <summary>
        /// 查询SQL语句获取DataReader
        /// </summary>
        /// <param name="strSQL">查询的SQL语句</param>
        /// <param name="cmdtype">执行类型</param>
        /// <param name="paras">参数列表，没有参数填入null</param>
        /// <returns>查询到的DataReader（关闭该对象的时候，自动关闭连接）</returns>
        public static SqlDataReader GetReader(string strSQL, CommandType cmdtype, params SqlParameter[] paras)
        {
            SqlDataReader sqldr = null;
            SqlConnection conn = new SqlConnection(StrConn);
            SqlCommand cmd = new SqlCommand(strSQL, conn);
            cmd.CommandType = cmdtype;
            if (paras != null)
            {
                cmd.Parameters.AddRange(paras);
            }
            conn.Open();
            //CommandBehavior.CloseConnection的作用是如果关联的DataReader对象关闭，则连接自动关闭
            sqldr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
            return sqldr;
        }

        #endregion

        #region 获取DataTable

        /// <summary>
        /// 执行查询，返回DataTable对象
        /// </summary>
        /// <param name="strSQL">sql语句</param>
        /// <param name="cmdtype">Command类型</param>
        /// <param name="paras">参数数组</param>
        /// <returns>DataTable对象</returns>
        public static DataTable GetTable(string strSQL, CommandType cmdtype, params SqlParameter[] paras)
        {
            DataTable dt = new DataTable(); ;
            using (SqlConnection conn = new SqlConnection(StrConn))
            {
                SqlDataAdapter da = new SqlDataAdapter(strSQL, conn);
                da.SelectCommand.CommandType = cmdtype;
                if (paras != null)
                {
                    da.SelectCommand.Parameters.AddRange(paras);
                }
                da.Fill(dt);
            }
            return dt;
        }

        /// <summary>
        /// 执行无参数语句
        /// </summary>
        /// <param name="strSQL">执行SQL</param>
        /// <returns>DataTable</returns>
        public static DataTable GetTable(string strSQL)
        {
            return GetTable(strSQL, null);
        }

        /// <summary>
        /// 执行有参语句
        /// </summary>
        /// <param name="strSQL">执行SQL</param>
        /// <param name="paras">参数数组</param>
        /// <returns>DataTable</returns>
        public static DataTable GetTable(string strSQL, params SqlParameter[] paras)
        {
            return GetTable(strSQL, CommandType.Text, paras);
        }

        #endregion

        #region 获取DataSet

        /// <summary>
        /// 执行查询，返回DataSet对象
        /// </summary>
        /// <param name="strSQL">sql语句</param>
        /// <param name="cmdtype">Command类型</param>
        /// <param name="paras">参数数组</param>
        /// <returns>DataSet对象</returns>
        public static DataSet GetDataSet(string strSQL, CommandType cmdtype, params SqlParameter[] paras)
        {
            DataSet dt = new DataSet(); ;
            using (SqlConnection conn = new SqlConnection(StrConn))
            {
                SqlDataAdapter da = new SqlDataAdapter(strSQL, conn);
                da.SelectCommand.CommandType = cmdtype;
                if (paras != null)
                {
                    da.SelectCommand.Parameters.AddRange(paras);
                }
                da.Fill(dt);
            }
            return dt;
        }

        /// <summary>
        /// 执行无参数的SQL
        /// </summary>
        /// <param name="strSQL">执行SQL</param>
        /// <returns>DataSet</returns>
        public static DataSet GetDataSet(string strSQL)
        {
            return GetDataSet(strSQL, null);
        }

        /// <summary>
        /// 执行有参数的SQL
        /// </summary>
        /// <param name="strSQL">执行SQL</param>
        /// <param name="paras">参数数组</param>
        /// <returns>DataSet</returns>
        public static DataSet GetDataSet(string strSQL, SqlParameter[] paras)
        {
            return GetDataSet(strSQL, CommandType.Text, paras);
        }

        #endregion

        #region 批量插入数据处理

        /// <summary>
        /// 往数据库中批量插入数据
        /// </summary>
        /// <param name="sourceDt">数据源表</param>
        /// <param name="targetTable">服务器上目标表</param>
        public static void BulkToDB(DataTable sourceDt, string targetTable)
        {
            SqlConnection conn = new SqlConnection(strConn);
            SqlBulkCopy bulkCopy = new SqlBulkCopy(conn);   //用其它源的数据有效批量加载sql server表中
            bulkCopy.DestinationTableName = targetTable;    //服务器上目标表的名称
            bulkCopy.BatchSize = sourceDt.Rows.Count;   //每一批次中的行数

            try
            {
                conn.Open();
                if (sourceDt != null && sourceDt.Rows.Count != 0)
                    bulkCopy.WriteToServer(sourceDt);   //将提供的数据源中的所有行复制到目标表中
            }
            catch (System.Exception ex)
            {
                throw ex;
            }
            finally
            {
                conn.Close();
                if (bulkCopy != null)
                    bulkCopy.Close();
            }

        }

        #endregion

        #endregion
    }
}