ADO.NET之常用功能的封装

　　一、连接字符串(使用配置文件)

　　添加对 System.Configuration的引用，并且在封装类中引入该namespace

        /// <summary>        /// 功能：读取配置文件中的连接字符串        /// 返回值类型：string        /// </summary>        /// <param name="conName">参数：配置文件中的连接字符串名称</param>        /// <returns>返回值：string 连接字符串</returns>        public static string GetConnectString(string conName)        {            try            {                return ConfigurationManager.ConnectionStrings[conName].ConnectionString;            }            catch (Exception e)            {                throw e;            }        }

　　二、SqlConnection对象

        /// <summary>        /// 功能：根据给定的连接字符串创建一个SqlConnection对象        /// 返回类型：SqlConnection        /// </summary>        /// <param name="conStr">参数：连接字符串</param>        /// <returns>返回值：SqlConnection对象</returns>        public static SqlConnection GetConnect(string conStr)        {            return new SqlConnection(conStr);        }

        /// <summary>        /// 功能：打开数据库连接        /// </summary>        /// <param name="Con">参数：SqlConnection对象</param>        public static void OpenDBConnet(SqlConnection Con)        {            try            {                if (Con.State == ConnectionState.Open)                {                    return;                }                else                {                    Con.Open();                }            }            catch (SqlException e)            {                throw e;            }        }

        /// <summary>        /// 功能：关闭数据库连接        /// </summary>        /// <param name="Con">参数：SqlConnection对象</param>        public static void CloseDBConnect(SqlConnection Con)        {            try            {                if (Con.State == ConnectionState.Closed)                {                    return;                }                else                {                    Con.Close();                }            }            catch (SqlException e)            {                throw e;            }        }

　　三、同步操作数据库

　　SqlDataReader对象　

        /// <summary>        /// 功能：执行存储过程并返回一个SqlDataReader对象        /// </summary>        /// <param name="sql">参数：存储过程名</param>        /// <param name="Con">参数：SqlConnection对象</param>        /// <param name="parameters">参数：SqlParameter参数数组</param>        /// <returns>返回值：SqlDataReader对象</returns>        public static SqlDataReader GetSdrBySp(string sql, SqlConnection Con, params SqlParameter[] parameters)        {            SqlCommand Cmd = null;            try            {                Cmd = new SqlCommand(sql, Con);                DBHelper.OpenDBConnet(Con);                Cmd.CommandType = CommandType.StoredPRocedure;                foreach (SqlParameter parameter in parameters)                {                    Cmd.Parameters.Add(parameter);                }            }            catch (SqlException s)            {                throw s;            }            return Cmd.ExecuteReader(CommandBehavior.CloseConnection);        }

        /// <summary>        /// 功能：执行T-SQL语句语句并返回一个SqlDataReader对象        /// </summary>        /// <param name="sql">参数：T-SQL语句</param>        /// <param name="Con">参数：SqlConnection对象</param>        /// <param name="parameters">参数：SqlParameter参数数组</param>        /// <returns>返回值：SqlDataReader对象</returns>        public static SqlDataReader GetSdrByTSql(string sql, SqlConnection Con, params SqlParameter[] parameters)        {            SqlCommand Cmd = null;            try            {                Cmd = new SqlCommand(sql, Con);                DBHelper.OpenDBConnet(Con);                Cmd.CommandType = CommandType.Text;                foreach (SqlParameter parameter in parameters)                {                    Cmd.Parameters.Add(parameter);                }            }            catch (SqlException s)            {                throw s;            }            return Cmd.ExecuteReader(CommandBehavior.CloseConnection);        }

　　ExecuteNonQuery

        /// <summary>        /// 功能：执行存储过程返回受影响的行数        /// 返回类型：int        /// </summary>        /// <param name="sql">参数：存储过程名</param>        /// <param name="Con">参数：SqlConnection对象</param>        /// <param name="parameters">参数：SqlParameter参数数组</param>        /// <returns>返回值：int 受影响的行数</returns>        public static int GetEnqBySp(string sql, SqlConnection Con, params SqlParameter[] parameters)        {            SqlCommand Cmd = null;            try            {                Cmd = new SqlCommand(sql, Con);                DBHelper.OpenDBConnet(Con);                Cmd.CommandType = CommandType.StoredProcedure;                foreach (SqlParameter parameter in parameters)                {                    Cmd.Parameters.Add(parameter);                }            }            catch (SqlException s)            {                throw s;            }            return Cmd.ExecuteNonQuery();        }

        /// <summary>        /// 功能：执行T-SQL语句返回受影响的行数        /// </summary>        /// <param name="sql">参数：T-SQL语句</param>        /// <param name="Con">参数：SqlConnection对象</param>        /// <param name="parameters">参数：SqlParameter参数数组</param>        /// <returns>返回值：int 受影响的行数</returns>        public static int GetEnqByTSql(string sql, SqlConnection Con, params SqlParameter[] parameters)        {            SqlCommand Cmd = null;            try            {                Cmd = new SqlCommand(sql, Con);                DBHelper.OpenDBConnet(Con);                Cmd.CommandType = CommandType.Text;                foreach (SqlParameter parameter in parameters)                {                    Cmd.Parameters.Add(parameter);                }            }            catch (SqlException s)            {                throw s;            }            return Cmd.ExecuteNonQuery();        }

　　ExecuteScalar

        /// <summary>        /// 功能：通过T-SQl语句执行SqlCommand的ExecuteScalar()方法返回object类型对象        /// </summary>        /// <param name="sql">参数：T-SQL语句</param>        /// <param name="Con">参数：SqlConnection对象</param>        /// <param name="parameters">参数：SqlParameter参数数组</param>        /// <returns>返回值：object对象</returns>        public static object GetEScalarByTSql(string sql, SqlConnection Con, params SqlParameter[] parameters)        {            SqlCommand Cmd = null;            try            {                Cmd = new SqlCommand(sql, Con);                DBHelper.OpenDBConnet(Con);                Cmd.CommandType = CommandType.Text;                foreach (SqlParameter parameter in parameters)                {                    Cmd.Parameters.Add(parameter);                }            }            catch (SqlException s)            {                throw s;            }            return Cmd.ExecuteScalar();        }

        /// <summary>        /// 功能：通过执行T-SQL语句返回一个DataSet数据集对象        /// </summary>        /// <param name="sql">参数：T-SQL语句</param>        /// <param name="tableName">参数：DataSet表名</param>        /// <param name="Con">参数：SqlConnection对象</param>        /// <param name="parameters">参数：可变SqlParameter参数数组</param>        /// <returns>返回值：DataSet数据集对象</returns>        public static DataSet GetDsByTSql(string sql, string tableName, SqlConnection Con, params SqlParameter[] parameters)        {            SqlCommand Cmd = null;            DataSet Ds = null;            SqlDataAdapter Sda = null;            try            {                Ds = new DataSet(tableName);                Cmd = new SqlCommand(sql, Con);                DBHelper.OpenDBConnet(Con);                Cmd.CommandType = CommandType.Text;