WebMatrix之改造WebMatrix.Data

WebMatrix数据访问系列目录：

• WebMatrix之数据访问
• WebMatrix之WebMatrix.Data
• WebMatrix之WebMatrix.Data揭密
• WebMatrix之改造WebMatrix.Data

 

 

通过上几篇文章的介绍可以发现，WebMatrix.Data组件虽然可以跨数据库，但对存储过程的访问是不支持的，下面我们就来改造WebMatrix.Data，实现对存储过程的访问，使之成为一个真正意义上的Universal Database Access Components。

直接上代码：

 public partial class Database

    {

        internal IEnumerable<dynamic> QueryWithProcedure(string procedureName, IEnumerable<DbParameter> parameters)

        {

            EnsureConnectionOpen();

            DbCommand command = Connection.CreateCommand();

            command.CommandType = CommandType.StoredProcedure;

            command.CommandText = procedureName;

            AddParameters(command, parameters);

            using (command)

            {

                IEnumerable<string> columnNames = null;

                using (DbDataReader reader = command.ExecuteReader())

                {

                    foreach (DbDataRecord record in reader)

                    {

                        if (columnNames == null)

                        {

                            columnNames = GetColumnNames(record);

                        }

                        yield return new DynamicRecord(columnNames, record);

                    }

                }

            }

        }

        internal int ExecuteWithProcedure(string procedureName, IEnumerable<DbParameter> parameters)

        {

            EnsureConnectionOpen();



            DbCommand command = Connection.CreateCommand();

            command.CommandType = CommandType.StoredProcedure;

            command.CommandText = procedureName;



            AddParameters(command, parameters);

            using (command)

            {

                return command.ExecuteNonQuery();

            }

        }

        internal dynamic QueryValueWithProcedure(string procedureName, IEnumerable<DbParameter> parameters)

        {

            EnsureConnectionOpen();



            DbCommand command = Connection.CreateCommand();

            command.CommandType = CommandType.StoredProcedure;

            command.CommandText = procedureName;



            AddParameters(command, parameters);

            using (command)

            {

                return command.ExecuteScalar();

            }

        }

        private static void AddParameters(DbCommand command, IEnumerable<DbParameter> parameters)

        {

            if (parameters == null) return;

            foreach (var p in parameters)

            {

                command.Parameters.Add(p);

            }

        }



        /// <summary>

        /// specify a procedure to query records.

        /// </summary>

        /// <param name="procedureName"></param>

        /// <param name="parameters"></param>

        /// <returns></returns>

        public IEnumerable<dynamic> Query(string procedureName, Func<IEnumerable<DbParameter>> parameters )

        {

            if (String.IsNullOrEmpty(procedureName))

            {

                throw ExceptionHelper.CreateArgumentNullOrEmptyException("procedureName");

            }

            return QueryWithProcedure(procedureName, parameters == null ? null : parameters());

        }

        /// <summary>

        /// specify a procedure to query one record.

        /// </summary>

        /// <param name="procedureName"></param>

        /// <param name="parameters"></param>

        /// <returns></returns>

        public dynamic QuerySingle(string procedureName, Func<IEnumerable<DbParameter>> parameters)

        {

            if (String.IsNullOrEmpty(procedureName))

            {

                throw ExceptionHelper.CreateArgumentNullOrEmptyException("procedureName");

            }

            return Query(procedureName,parameters).FirstOrDefault();

        }



        /// <summary>

        /// specify a procedure to execute data logic.

        /// </summary>

        /// <param name="procedureName"></param>

        /// <param name="parameters"></param>

        /// <returns></returns>

        public int Execute(string procedureName, Func<IEnumerable<DbParameter>> parameters )

        {

            if (String.IsNullOrEmpty(procedureName))

            {

                throw ExceptionHelper.CreateArgumentNullOrEmptyException("procedureName");

            }

            return ExecuteWithProcedure(procedureName, parameters == null ? null : parameters());

        }



        /// <summary>

        /// specify a procedure to query value.

        /// </summary>

        /// <param name="procedureName"></param>

        /// <param name="parameters"></param>

        /// <returns></returns>

        public dynamic QueryValue(string procedureName, Func<IEnumerable<DbParameter>> parameters)

        {

            if (String.IsNullOrEmpty(procedureName))

            {

                throw ExceptionHelper.CreateArgumentNullOrEmptyException("procedureName");

            }

            return QueryValueWithProcedure(procedureName, parameters == null ? null : parameters());

        }

    }

改造后使用方法如下，我使用的是ODP.NET：

static void TestExtesionWithOracle()

        {

            var db = Database.Open("myoracle");



            var insert_result = db.Execute("PCK_SYSDICT.insert_data", () => new List<OracleParameter>() 

            { 

                new OracleParameter("p_dict_name", OracleDbType.Varchar2,"testdb123",ParameterDirection.Input),

                new OracleParameter("p_dict_name", OracleDbType.Varchar2,"123333",ParameterDirection.Input),

                new OracleParameter("p_dict_name", OracleDbType.Varchar2,"this is my test dict table",ParameterDirection.Input)

            });



            var data = db.Query("PCK_SYSDICT.GET_ALL_DATA", () => new List<OracleParameter>() 

            { 

                new OracleParameter("p_cur", OracleDbType.RefCursor,DBNull.Value,ParameterDirection.Output)

            });



            foreach (var item in data)

            {

                Console.WriteLine("DICT_NAME:{0},VALUE:{1},DES:{2}", item.DICT_NAME, item.VALUE, item.DES);

            }

        }

使用的package 头如下：

create or replace package PCK_SYSDICT is

  type rowset IS REF CURSOR;

  PROCEDURE get_all_data(p_cur OUT NOCOPY rowset);

  PROCEDURE get_one_data(p_dict_id IN NUMBER, p_cur OUT rowset);

  PROCEDURE insert_data(p_dict_name IN VARCHAR2,

                        p_value     IN VARCHAR2,

                        p_des       in VARCHAR2);

end PCK_SYSDICT;

WebMatrix数据访问系列演示代码下载此处。