SQLHELPER类

using System;
using System.Data.SqlClient;
using System.Configuration;//使您能够与系统进程、事件日志和性能计数器进行交互
using System.ComponentModel;//此命名空间包括用于实现属性和类型转换器、绑定到数据源以及授权组件的基类和接口
using System.Collections;//这些接口和类定义各种对象（如列表、队列、位数组、哈希表和字典）的集合
using System.Diagnostics;//使您能够与系统进程、事件日志和性能计数器进行交互
using System.Data;
namespace SQLServerDAL
{
    public class sqlhelper
    {
        public static SqlConnection MyConnection;
        private readonly string RETURNVALUE = "RETURNVALUE";
        private static readonly String StringConnection = "data source=(local);user id=sa;password=;initial catalog=newcrm";
        public sqlhelper()
        {
 
        }
        public static void Open()
        {
            if (MyConnection == null)
            {
                MyConnection = new SqlConnection(StringConnection);
            }
            if (MyConnection.State == ConnectionState.Closed)
            {
               
                    ///打开数据库连接
                    MyConnection.Open();
             
            }
        }
        public static void Close()
        {
            if (MyConnection != null)
            {
                ///判断连接的状态是否打开
                if (MyConnection.State == ConnectionState.Open)
                {
                    MyConnection.Close();
                }
            }
        }
        public DataSet GetDataSet(string strCommandString, string strTableName)
        {
            //SqlCommand cmdCommand = new SqlCommand(strCommandString,myConnection);
          
            SqlDataAdapter adAdapter = new SqlDataAdapter();
            adAdapter.SelectCommand = new SqlCommand(strCommandString, MyConnection);
            DataSet dsDataSet = new DataSet();
            dsDataSet.Clear();
            adAdapter.Fill(dsDataSet, strTableName);
            return dsDataSet;
        }
        /// <summary>
        /// 执行存储过程
        /// </summary>
        /// <param name="procName">存储过程的名称</param>
        /// <returns>返回存储过程返回值</returns>
        public int RunProc(string procName)
        {
            SqlCommand cmd = CreateCommand(procName, null);
           
                ///执行存储过程
                cmd.ExecuteNonQuery();
          
                ///记录错误日志
               
          
            ///关闭数据库的连接
            Close();
          

            ///返回存储过程的参数值
            return (int)cmd.Parameters[RETURNVALUE].Value;
        }

        /// <summary>
        /// 执行存储过程
        /// </summary>
        /// <param name="procName">存储过程名称</param>
        /// <param name="prams">存储过程所需参数</param>
        /// <returns>返回存储过程返回值</returns>
        public int RunProc(string procName, SqlParameter[] prams)
        {
            SqlCommand cmd = CreateCommand(procName, prams);
           
                ///执行存储过程
                cmd.ExecuteNonQuery();
          
            ///关闭数据库的连接
            Close();

            ///返回存储过程的参数值
            return (int)cmd.Parameters[RETURNVALUE].Value;
        }

        /// <summary>
        /// 执行存储过程
        /// </summary>
        /// <param name="procName">存储过程的名称</param>
        /// <param name="dataReader">返回存储过程返回值</param>
        public void RunProc(string procName, out SqlDataReader dataReader)
        {
            ///创建Command
            SqlCommand cmd = CreateCommand(procName, null);

            ///读取数据
            dataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
        }

        /// <summary>
        /// 执行存储过程
        /// </summary>
        /// <param name="procName">存储过程的名称</param>
        /// <param name="prams">存储过程所需参数</param>
        /// <param name="dataReader">存储过程所需参数</param>
        public void RunProc(string procName, SqlParameter[] prams, out SqlDataReader dataReader)
        {
            ///创建Command
            SqlCommand cmd = CreateCommand(procName, prams);

            ///读取数据
            dataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
        }

        /// <summary>
        /// 创建一个SqlCommand对象以此来执行存储过程
        /// </summary>
        /// <param name="procName">存储过程的名称</param>
        /// <param name="prams">存储过程所需参数</param>
        /// <returns>返回SqlCommand对象</returns>
        private SqlCommand CreateCommand(string procName, SqlParameter[] prams)
        {
            ///打开数据库连接
            Open();

            ///设置Command
            SqlCommand cmd = new SqlCommand(procName, MyConnection);
            cmd.CommandType = CommandType.StoredProcedure;

            ///添加把存储过程的参数
            if (prams != null)
            {
                foreach (SqlParameter parameter in prams)
                {
                    cmd.Parameters.Add(parameter);
                }
            }

            ///添加返回参数ReturnValue
            cmd.Parameters.Add(
                new SqlParameter(RETURNVALUE, SqlDbType.Int, 4, ParameterDirection.ReturnValue,
                false, 0, 0, string.Empty, DataRowVersion.Default, null));

            ///返回创建的SqlCommand对象
            return cmd;
        }

        /// <summary>
        /// 生成存储过程参数
        /// </summary>
        /// <param name="ParamName">存储过程名称</param>
        /// <param name="DbType">参数类型</param>
        /// <param name="Size">参数大小</param>
        /// <param name="Direction">参数方向</param>
        /// <param name="Value">参数值</param>
        /// <returns>新的 parameter 对象</returns>
        public SqlParameter CreateParam(string ParamName, SqlDbType DbType, Int32 Size, ParameterDirection Direction, object Value)
        {
            SqlParameter param;

            ///当参数大小为0时，不使用该参数大小值
            if (Size > 0)
            {
                param = new SqlParameter(ParamName, DbType, Size);
            }
            else
            {
                ///当参数大小为0时，不使用该参数大小值
                param = new SqlParameter(ParamName, DbType);
            }

            ///创建输出类型的参数
            param.Direction = Direction;
            if (!(Direction == ParameterDirection.Output && Value == null))
            {
                param.Value = Value;
            }

            ///返回创建的参数
            return param;
        }

        /// <summary>
        /// 传入输入参数
        /// </summary>
        /// <param name="ParamName">存储过程名称</param>
        /// <param name="DbType">参数类型</param></param>
        /// <param name="Size">参数大小</param>
        /// <param name="Value">参数值</param>
        /// <returns>新的parameter 对象</returns>
        public SqlParameter CreateInParam(string ParamName, SqlDbType DbType, int Size, object Value)
        {
            ///创建输入类型的参数
            return CreateParam(ParamName, DbType, Size, ParameterDirection.Input, Value);
        }

        /// <summary>
        /// 传入返回值参数
        /// </summary>
        /// <param name="ParamName">存储过程名称</param>
        /// <param name="DbType">参数类型</param>
        /// <param name="Size">参数大小</param>
        /// <returns>新的 parameter 对象</returns>
        public SqlParameter CreateOutParam(string ParamName, SqlDbType DbType, int Size)
        {
            ///创建输出类型的参数
            return CreateParam(ParamName, DbType, Size, ParameterDirection.Output, null);
        }

        /// <summary>
        /// 传入返回值参数
        /// </summary>
        /// <param name="ParamName">存储过程名称</param>
        /// <param name="DbType">参数类型</param>
        /// <param name="Size">参数大小</param>
        /// <returns>新的 parameter 对象</returns>
        public SqlParameter CreateReturnParam(string ParamName, SqlDbType DbType, int Size)
        {
            ///创建返回类型的参数
            return CreateParam(ParamName, DbType, Size, ParameterDirection.ReturnValue, null);
        }

 
    }
}