database.cs

基于微软的 ASP.NET+C#开发的PETSHOP(网上宠物店)项目,在性能及开发效率上明显优于基于SUN J2EE框架开发的PETSHOP. 项目包括所有源码及数据库建库脚本,是不错的学习 AS

using System;
using System.ComponentModel;
using System.Collections;
using System.Diagnostics;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;

namespace PetShop.Components {
	/// <summary>
	/// ADO.NET data access using the SQL Server Managed Provider.
	/// </summary>
	public class Database : IDisposable {
		// connection to data source
		private SqlConnection con;
		
		/// <summary>
		/// Run stored procedure.
		/// </summary>
		/// <param name="procName">Name of stored procedure.</param>
		/// <returns>Stored procedure return value.</returns>
		public int RunProc(string procName) {
			SqlCommand cmd = CreateCommand(procName, null);
			cmd.ExecuteNonQuery();
			this.Close();
			return (int)cmd.Parameters["ReturnValue"].Value;
		}

		/// <summary>
		/// Run stored procedure.
		/// </summary>
		/// <param name="procName">Name of stored procedure.</param>
		/// <param name="prams">Stored procedure params.</param>
		/// <returns>Stored procedure return value.</returns>
		public int RunProc(string procName, SqlParameter[] prams) {
			SqlCommand cmd = CreateCommand(procName, prams);
			cmd.ExecuteNonQuery();
			this.Close();
			return (int)cmd.Parameters["ReturnValue"].Value;
		}

		/// <summary>
		/// Run stored procedure.
		/// </summary>
		/// <param name="procName">Name of stored procedure.</param>
		/// <param name="dataReader">Return result of procedure.</param>
		public void RunProc(string procName, out SqlDataReader dataReader) {
			SqlCommand cmd = CreateCommand(procName, null);
			dataReader = cmd.ExecuteReader(System.Data.CommandBehavior.CloseConnection);
		}

		/// <summary>
		/// Run stored procedure.
		/// </summary>
		/// <param name="procName">Name of stored procedure.</param>
		/// <param name="prams">Stored procedure params.</param>
		/// <param name="dataReader">Return result of procedure.</param>
		public void RunProc(string procName, SqlParameter[] prams, out SqlDataReader dataReader) {
			SqlCommand cmd = CreateCommand(procName, prams);
			dataReader = cmd.ExecuteReader(System.Data.CommandBehavior.CloseConnection);
		}
		
		/// <summary>
		/// Create command object used to call stored procedure.
		/// </summary>
		/// <param name="procName">Name of stored procedure.</param>
		/// <param name="prams">Params to stored procedure.</param>
		/// <returns>Command object.</returns>
		private SqlCommand CreateCommand(string procName, SqlParameter[] prams) {
			// make sure connection is open
			Open();

			//command = new SqlCommand( sprocName, new SqlConnection( ConfigManager.DALConnectionString ) );
			SqlCommand cmd = new SqlCommand(procName, con);
			cmd.CommandType = CommandType.StoredProcedure;

			// add proc parameters
			if (prams != null) {
				foreach (SqlParameter parameter in prams)
					cmd.Parameters.Add(parameter);
			}
			
			// return param
			cmd.Parameters.Add(
				new SqlParameter("ReturnValue", SqlDbType.Int, 4,
				ParameterDirection.ReturnValue, false, 0, 0,
				string.Empty, DataRowVersion.Default, null));

			return cmd;
		}

		/// <summary>
		/// Open the connection.
		/// </summary>
		private void Open() {
			// open connection
			if (con == null) {
				con = new SqlConnection(ConfigurationSettings.AppSettings["ConnectionString"]);
				con.Open();
			}				
		}

		/// <summary>
		/// Close the connection.
		/// </summary>
		public void Close() {
			if (con != null)
				con.Close();
		}

		/// <summary>
		/// Release resources.
		/// </summary>
		public void Dispose() {
			// make sure connection is closed
			if (con != null) {
				con.Dispose();
				con = null;
			}				
		}

		/// <summary>
		/// Make input param.
		/// </summary>
		/// <param name="ParamName">Name of param.</param>
		/// <param name="DbType">Param type.</param>
		/// <param name="Size">Param size.</param>
		/// <param name="Value">Param value.</param>
		/// <returns>New parameter.</returns>
		public SqlParameter MakeInParam(string ParamName, SqlDbType DbType, int Size, object Value) {
			return MakeParam(ParamName, DbType, Size, ParameterDirection.Input, Value);
		}		

		/// <summary>
		/// Make input param.
		/// </summary>
		/// <param name="ParamName">Name of param.</param>
		/// <param name="DbType">Param type.</param>
		/// <param name="Size">Param size.</param>
		/// <returns>New parameter.</returns>
		public SqlParameter MakeOutParam(string ParamName, SqlDbType DbType, int Size) {
			return MakeParam(ParamName, DbType, Size, ParameterDirection.Output, null);
		}		

		/// <summary>
		/// Make stored procedure param.
		/// </summary>
		/// <param name="ParamName">Name of param.</param>
		/// <param name="DbType">Param type.</param>
		/// <param name="Size">Param size.</param>
		/// <param name="Direction">Parm direction.</param>
		/// <param name="Value">Param value.</param>
		/// <returns>New parameter.</returns>
		public SqlParameter MakeParam(string ParamName, SqlDbType DbType, Int32 Size, ParameterDirection Direction, object Value) {
			SqlParameter param;

			if(Size > 0)
				param = new SqlParameter(ParamName, DbType, Size);
			else
				param = new SqlParameter(ParamName, DbType);

			param.Direction = Direction;
			if (!(Direction == ParameterDirection.Output && Value == null))
				param.Value = Value;

			return param;
		}
	}
}