3层模型常用代码

/////////////////////////////////////////////////////
/////////////////////////////////////////////////////
//引用关系
BLL          DALFactory   IDAL    Model
UI           BLL   Model
DALFactory   IDAL  OracleDAL   SqlServerDAL
DBUtilit
IDAL                 Model
Model
OracleDAL       DBUtility IDAL Model
SqlServerDAL DBUtility IDAL Model


////////////////////////////////////////////////////////
////////////////////////////////////////////////////////
//配置文件
<appSettings>
        <add key="DbType" value="School.DALfactory"/>
        <add key="FactoryType" value="SqlServerDALFactor"/>
        <add key="SqlConnectionString" value="Data Source=.;Initial Catalog=SchoolTest;User ID=sa;Password=p@ssw0rd"/>
        <add key="OracleConnectionString" value="Data Source=Accp;User ID=scott;Password=tiger"/>
</appSettings>


///////////////////////////////////////////////////////
///////////////////////////////////////////////////////
//BLL层
using System;
using System.Collections.Generic;
using System.Text;
using System.Configuration;
using School.DALFactory;
using School.IDAL;
using School.Model;
namespace School.BLL
{
    public class Student
    {
        private static AbstractDALFactory factory = AbstractDALFactory.ChooseFactory();
        private static IStudent student = factory.CreateStudent();

        IList<School.Model.Student> GetAllStudents()
        {
            return student.GetAllStudents();
        }
        
        ...  ...
    }
}


//////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////
//AbstractDALFactory层
using System;
using System.Collections.Generic;
using System.Text;
using School.IDAL;
using School.OracleDAL;
using School.SQLServerDAL;
using System.Configuration;
using System.Reflection;
namespace School.DALFactory
{
    public abstract class AbstractDALFactory
    {
        private static string path = ConfigurationManager.AppSettings["DbType"].ToString();
        private static string dbType = ConfigurationManager.AppSettings["FactoryType"].ToString();
        public static AbstractDALFactory ChooseFactory()
        {
            AbstractDALFactory factory = null;
            string className = path + "." + dbType;
            factory = (School.DALFactory.AbstractDALFactory)Assembly.Load(path).CreateInstance(className);
            return factory;
        }
        public abstract IStudent CreateStudent();
        // ...   ...
    }
}


//////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////
//DButility for sql
using System;
using System.Collections.Generic;
using System.Text;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Collections;

namespace School.DBUtility
{
    public abstract class SqlHelper
    {
        /// <summary>
        /// 连接字符串
        /// </summary>
        public static readonly string ConnectionString = ConfigurationManager.AppSettings["SqlConnectionString"].ToString();
        private static Hashtable parmCache = Hashtable.Synchronized(new Hashtable());

        /// <summary>
        /// 执行非查询操作
        /// </summary>
        /// <param name="connectionString">连接字符串</param>
        /// <param name="cmdType">命令类型（SQL或者存储过程方式）</param>
        /// <param name="cmdText">SQL语句或者存储过程名</param>
        /// <param name="commandParameters">参数列表（SQL语句中的参数或者存储过程的参数）</param>
        /// <returns></returns>
        public static int ExecuteNonQuery(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {

            SqlCommand cmd = new SqlCommand();

            using (SqlConnection conn = new SqlConnection(connectionString))
            {
                PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
                int val = cmd.ExecuteNonQuery();
                cmd.Parameters.Clear();
                return val;
            }
        }
        /// <summary>
        /// 执行非查询操作
        /// </summary>
        /// <param name="connection">连接对象</param>
        /// <param name="cmdType">命令类型（SQL或者存储过程方式）</param>
        /// <param name="cmdText">SQL语句或者存储过程名</param>
        /// <param name="commandParameters">参数列表（SQL语句中的参数或者存储过程的参数）</param>
        /// <returns></returns>
        public static int ExecuteNonQuery(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {

            SqlCommand cmd = new SqlCommand();

            PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
            int val = cmd.ExecuteNonQuery();
            cmd.Parameters.Clear();
            return val;
        }

        /// <summary>
        /// 执行事务中的非查询操作
        /// </summary>
        /// <param name="trans">事务对象</param>
        /// <param name="cmdType">命令类型（SQL或者存储过程方式）</param>
        /// <param name="cmdText">SQL语句或者存储过程名</param>
        /// <param name="commandParameters">参数列表（SQL语句中的参数或者存储过程的参数）</param>
        /// <returns></returns>
        public static int ExecuteNonQuery(SqlTransaction trans, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            SqlCommand cmd = new SqlCommand();
            PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, commandParameters);
            int val = cmd.ExecuteNonQuery();
            cmd.Parameters.Clear();
            return val;
        }

        /// <summary>
        /// 执行查询操作
        /// </summary>
        /// <param name="connectionString">连接字符串</param>
        /// <param name="cmdType">命令类型（SQL或者存储过程方式）</param>
        /// <param name="cmdText">SQL语句或者存储过程名</param>
        /// <param name="commandParameters">参数列表（SQL语句中的参数或者存储过程的参数）</param>
        /// <returns></returns>
        public static SqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            SqlCommand cmd = new SqlCommand();
            SqlConnection conn = new SqlConnection(connectionString);

            try
            {
                PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
                SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                cmd.Parameters.Clear();
                return rdr;
            }
            catch
            {
                conn.Close();
                throw;
            }
        }

        /// <summary>
        ///
        /// </summary>
        /// <param name="connectionString">连接字符串</param>
        /// <param name="cmdType">命令类型（SQL或者存储过程方式）</param>
        /// <param name="cmdText">SQL语句或者存储过程名</param>
        /// <param name="commandParameters">参数列表（SQL语句中的参数或者存储过程的参数）</param>
        /// <returns></returns>
        public static object ExecuteScalar(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            SqlCommand cmd = new SqlCommand();

            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
                object val = cmd.ExecuteScalar();
                cmd.Parameters.Clear();
                return val;
            }
        }

        /// <summary>
        ///
        /// </summary>
        /// <param name="connection"></param>
        /// <param name="cmdType"></param>
        /// <param name="cmdText"></param>
        /// <param name="commandParameters"></param>
        /// <returns></returns>
        public static object ExecuteScalar(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {

            SqlCommand cmd = new SqlCommand();

            PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
            object val = cmd.ExecuteScalar();
            cmd.Parameters.Clear();
            return val;
        }

        public static void CacheParameters(string cacheKey, params SqlParameter[] commandParameters)
        {
            parmCache[cacheKey] = commandParameters;
        }

        /// <summary>
        /// 克隆参数列表
        /// </summary>
        /// <param name="cacheKey">HashTable中的键</param>
        /// <returns></returns>
        public static SqlParameter[] GetCachedParameters(string cacheKey)
        {
            SqlParameter[] cachedParms = (SqlParameter[])parmCache[cacheKey];

            if (cachedParms == null)
                return null;

            SqlParameter[] clonedParms = new SqlParameter[cachedParms.Length];

            for (int i = 0, j = cachedParms.Length; i < j; i++)
                clonedParms[i] = (SqlParameter)((ICloneable)cachedParms[i]).Clone();

            return clonedParms;
        }

        /// <summary>
        /// 对数据库操作之前的准备工作，打开数据库，初始化SqlCommand，SQLTransaction,SQLCommand对象中的参数
        /// </summary>
        /// <param name="cmd">SqlCommand对象</param>
        /// <param name="conn">连接对象</param>
        /// <param name="trans">事务对象</param>
        /// <param name="cmdType">命令类型</param>
        /// <param name="cmdText">SQL语句或者存储过程名</param>
        /// <param name="cmdParms">参数列表</param>
        private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, CommandType cmdType, string cmdText, SqlParameter[] cmdParms)
        {

            if (conn.State != ConnectionState.Open)
                conn.Open();

            cmd.Connection = conn;
            cmd.CommandText = cmdText;

            if (trans != null)
                cmd.Transaction = trans;

            cmd.CommandType = cmdType;

            if (cmdParms != null)
            {
                foreach (SqlParameter parm in cmdParms)
                    cmd.Parameters.Add(parm);
            }
        }
    }
}



//////////////////////////////////////////////////////
//////////////////////////////////////////////////////
//DButility for oracle
using System;
using System.Configuration;
using System.Data;
using System.Data.OracleClient;
using System.Collections;

namespace PetShop.DBUtility {

    /// <summary>
    /// A helper class used to execute queries against an Oracle database
    /// </summary>
    public abstract class OracleHelper {

        // Read the connection strings from the configuration file
        public static readonly string ConnectionStringLocalTransaction = ConfigurationManager.ConnectionStrings["OraConnString1"].ConnectionString;
        public static readonly string ConnectionStringInventoryDistributedTransaction = ConfigurationManager.ConnectionStrings["OraConnString2"].ConnectionString;
        public static readonly string ConnectionStringOrderDistributedTransaction = ConfigurationManager.ConnectionStrings["OraConnString3"].ConnectionString;
        public static readonly string ConnectionStringProfile = ConfigurationManager.ConnectionStrings["OraProfileConnString"].ConnectionString;
        public static readonly string ConnectionStringMembership = ConfigurationManager.ConnectionStrings["OraMembershipConnString"].ConnectionString;

        //Create a hashtable for the parameter cached
        private static Hashtable parmCache = Hashtable.Synchronized(new Hashtable());

        /// <summary>
        /// Execute a database query which does not include a select
        /// </summary>
        /// <param name="connString">Connection string to database</param>
        /// <param name="cmdType">Command type either stored procedure or SQL</param>
        /// <param name="cmdText">Acutall SQL Command</param>
        /// <param name="commandParameters">Parameters to bind to the command</param>
        /// <returns></returns>
        public static int ExecuteNonQuery(string connectionString, CommandType cmdType, string cmdText, params OracleParameter[] commandParameters) {
            // Create a new Oracle command
            OracleCommand cmd = new OracleCommand();

            //Create a connection
            using (OracleConnection connection = new OracleConnection(connectionString)) {

                //Prepare the command
                PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);

                //Execute the command
                int val = cmd.ExecuteNonQuery();
                cmd.Parameters.Clear();
                return val;
            }
        }

        /// <summary>
        /// Execute an OracleCommand (that returns no resultset) against an existing database transaction
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders", new OracleParameter(":prodid", 24));
        /// </remarks>
        /// <param name="trans">an existing database transaction</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or PL/SQL command</param>
        /// <param name="commandParameters">an array of OracleParamters used to execute the command</param>
        /// <returns>an int representing the number of rows affected by the command</returns>
        public static int ExecuteNonQuery(OracleTransaction trans, CommandType cmdType, string cmdText, params OracleParameter[] commandParameters) {
            OracleCommand cmd = new OracleCommand();
            PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, commandParameters);
            int val = cmd.ExecuteNonQuery();
            cmd.Parameters.Clear();
            return val;
        }

        /// <summary>
        /// Execute an OracleCommand (that returns no resultset) against an existing database connection
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new OracleParameter(":prodid", 24));
        /// </remarks>
        /// <param name="conn">an existing database connection</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or PL/SQL command</param>
        /// <param name="commandParameters">an array of OracleParamters used to execute the command</param>
        /// <returns>an int representing the number of rows affected by the command</returns>
        public static int ExecuteNonQuery(OracleConnection connection, CommandType cmdType, string cmdText, params OracleParameter[] commandParameters) {

            OracleCommand cmd = new OracleCommand();

            PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
            int val = cmd.ExecuteNonQuery();
            cmd.Parameters.Clear();
            return val;
        }

        /// <summary>
        /// Execute a select query that will return a result set
        /// </summary>
        /// <param name="connString">Connection string</param>
        //// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or PL/SQL command</param>
        /// <param name="commandParameters">an array of OracleParamters used to execute the command</param>
        /// <returns></returns>
        public static OracleDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params OracleParameter[] commandParameters) {

            //Create the command and connection
            OracleCommand cmd = new OracleCommand();
            OracleConnection conn = new OracleConnection(connectionString);

            try {
                //Prepare the command to execute
                PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);

                //Execute the query, stating that the connection should close when the resulting datareader has been read
                OracleDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                cmd.Parameters.Clear();
                return rdr;

            }
            catch {

                //If an error occurs close the connection as the reader will not be used and we expect it to close the connection
                conn.Close();
                throw;
            }
        }

        /// <summary>
        /// Execute an OracleCommand that returns the first column of the first record against the database specified in the connection string
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new OracleParameter(":prodid", 24));
        /// </remarks>
        /// <param name="connectionString">a valid connection string for a SqlConnection</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or PL/SQL command</param>
        /// <param name="commandParameters">an array of OracleParamters used to execute the command</param>
        /// <returns>An object that should be converted to the expected type using Convert.To{Type}</returns>
        public static object ExecuteScalar(string connectionString, CommandType cmdType, string cmdText, params OracleParameter[] commandParameters) {
            OracleCommand cmd = new OracleCommand();

            using (OracleConnection conn = new OracleConnection(connectionString)) {
                PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
                object val = cmd.ExecuteScalar();
                cmd.Parameters.Clear();
                return val;
            }
        }

        ///    <summary>
        ///    Execute    a OracleCommand (that returns a 1x1 resultset)    against    the    specified SqlTransaction
        ///    using the provided parameters.
        ///    </summary>
        ///    <param name="transaction">A    valid SqlTransaction</param>
        ///    <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        ///    <param name="commandText">The stored procedure name    or PL/SQL command</param>
        ///    <param name="commandParameters">An array of    OracleParamters used to execute the command</param>
        ///    <returns>An    object containing the value    in the 1x1 resultset generated by the command</returns>
        public static object ExecuteScalar(OracleTransaction transaction, CommandType commandType, string commandText, params OracleParameter[] commandParameters) {
            if(transaction == null)
                throw new ArgumentNullException("transaction");
            if(transaction != null && transaction.Connection == null)
                throw new ArgumentException("The transaction was rollbacked    or commited, please    provide    an open    transaction.", "transaction");

            // Create a    command    and    prepare    it for execution
            OracleCommand cmd = new OracleCommand();

            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters);

            // Execute the command & return    the    results
            object retval = cmd.ExecuteScalar();

            // Detach the SqlParameters    from the command object, so    they can be    used again
            cmd.Parameters.Clear();
            return retval;
        }

        /// <summary>
        /// Execute an OracleCommand that returns the first column of the first record against an existing database connection
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  Object obj = ExecuteScalar(conn, CommandType.StoredProcedure, "PublishOrders", new OracleParameter(":prodid", 24));
        /// </remarks>
        /// <param name="conn">an existing database connection</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or PL/SQL command</param>
        /// <param name="commandParameters">an array of OracleParamters used to execute the command</param>
        /// <returns>An object that should be converted to the expected type using Convert.To{Type}</returns>
        public static object ExecuteScalar(OracleConnection connectionString, CommandType cmdType, string cmdText, params OracleParameter[] commandParameters) {
            OracleCommand cmd = new OracleCommand();

            PrepareCommand(cmd, connectionString, null, cmdType, cmdText, commandParameters);
            object val = cmd.ExecuteScalar();
            cmd.Parameters.Clear();
            return val;
        }

        /// <summary>
        /// Add a set of parameters to the cached
        /// </summary>
        /// <param name="cacheKey">Key value to look up the parameters</param>
        /// <param name="commandParameters">Actual parameters to cached</param>
        public static void CacheParameters(string cacheKey, params OracleParameter[] commandParameters) {
            parmCache[cacheKey] = commandParameters;
        }

        /// <summary>
        /// Fetch parameters from the cache
        /// </summary>
        /// <param name="cacheKey">Key to look up the parameters</param>
        /// <returns></returns>
        public static OracleParameter[] GetCachedParameters(string cacheKey) {
            OracleParameter[] cachedParms = (OracleParameter[])parmCache[cacheKey];

            if (cachedParms == null)
                return null;

            // If the parameters are in the cache
            OracleParameter[] clonedParms = new OracleParameter[cachedParms.Length];

            // return a copy of the parameters
            for (int i = 0, j = cachedParms.Length; i < j; i++)
                clonedParms[i] = (OracleParameter)((ICloneable)cachedParms[i]).Clone();

            return clonedParms;
        }

        /// <summary>
        /// Internal function to prepare a command for execution by the database
        /// </summary>
        /// <param name="cmd">Existing command object</param>
        /// <param name="conn">Database connection object</param>
        /// <param name="trans">Optional transaction object</param>
        /// <param name="cmdType">Command type, e.g. stored procedure</param>
        /// <param name="cmdText">Command test</param>
        /// <param name="commandParameters">Parameters for the command</param>
        private static void PrepareCommand(OracleCommand cmd, OracleConnection conn, OracleTransaction trans, CommandType cmdType, string cmdText, OracleParameter[] commandParameters) {

            //Open the connection if required
            if (conn.State != ConnectionState.Open)
                conn.Open();

            //Set up the command
            cmd.Connection = conn;
            cmd.CommandText = cmdText;
            cmd.CommandType = cmdType;

            //Bind it to the transaction if it exists
            if (trans != null)
                cmd.Transaction = trans;

            // Bind the parameters passed in
            if (commandParameters != null) {
                foreach (OracleParameter parm in commandParameters)
                    cmd.Parameters.Add(parm);
            }
        }

        /// <summary>
        /// Converter to use boolean data type with Oracle
        /// </summary>
        /// <param name="value">Value to convert</param>
        /// <returns></returns>
        public static string OraBit(bool value) {
            if(value)
                return "Y";
            else
                return "N";
        }

        /// <summary>
        /// Converter to use boolean data type with Oracle
        /// </summary>
        /// <param name="value">Value to convert</param>
        /// <returns></returns>
        public static bool OraBool(string value) {
            if(value.Equals("Y"))
                return true;
            else
                return false;
        }
    }
}


//////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////
//IDAL
using System;
using System.Collections.Generic;
using System.Text;
using School.Model;

namespace School.IDAL
{
    public interface IStudent
    {
        IList<StudentInfo> GetAllStudents();
        StudentInfo GetStudentById();

        int Delete(String id);
        int Update(StudentInfo objStu);
        int Insert(StudentInfo objStu);
    }
}


////////////////////////////////////////////////////////
////////////////////////////////////////////////////////
//Model
using System;
using System.Collections.Generic;
using System.Text;

namespace School.Model
{
    public class StudentInfo
    {
        public StudentInfo()
        {
        
        }
        public StudentInfo(String id, String name, int age)
        {
            _uId = id;
            _uName = name;
            _uAge = age;
        }

        private String _uId;
        private String _uName;
        private int _uAge;

        public String UId
        {
            get { return _uId; }
            set { _uId = value; }
        }

        public String UName
        {
            get { return _uName; }
            set { _uName = value; }
        }

        public int UAge
        {
            get { return _uAge; }
            set { _uAge = value; }
        }
    }
}


///////////////////////////////////////////////////
///////////////////////////////////////////////////
//SqlServerDAL
using System;
using System.Collections.Generic;
using System.Text;
using System.Data.SqlClient;
using School.DBUtility;
using School.IDAL;
using School.Model;

namespace School.SQLServerDAL
{
    public class Student : IStudent
    {
        private const String SQL_SELECT_GETALLSTUDENTS = "SELECT * FROM [student]";

        #region IStudent 成员

        public IList<StudentInfo> GetAllStudents()
        {
            IList<StudentInfo> list = new List<StudentInfo>();
            using (SqlDataReader sdr = SqlServerHelp.ExecuteReader(SqlServerHelp.ConnectionString, System.Data.CommandType.Text, SQL_SELECT_GETALLSTUDENTS, null))
            {
                while (sdr.Read())
                {
                    StudentInfo student = new StudentInfo();
                    student.UId = sdr["uID"].ToString().Trim();
                    student.UName = sdr["uName"].ToString().Trim();
                    student.UAge = Convert.ToInt32(sdr["uAge"]);
                    list.Add(student);
                }
                return list;
            }
        }

        public StudentInfo GetStudentById()
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public int Delete(string id)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public int Update(StudentInfo objStu)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public int Insert(StudentInfo objStu)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        #endregion
    }
}



//other example for SqlServerDAL
using System.Collections.Generic;
using System.Text;
using News.IDAL;
using News.Model;
using System.Data;
using System.Data.SqlClient;
using News.DBUtility;

namespace News.SqlServerDAL
{
   public  class Category:ICategory
    {
        private const string SQL_SELECT_CATEGORYS = "SELECT [CategoryId],[CategoryName] FROM [Category]";
        private const string SQL_SELECT_CATEGORY_BY_CATEGORYID = "SELECT [CategoryId],[CategoryName] FROM [Category] WHERE [CategoryID]=@CategoryId";
        private const string SQL_INSERT_CATEGORY = "INSERT INTO [Category]([CategoryId],[CategoryName]) VALUES(@CategoryId,@CategoryName)";
        private const string SQL_DELETE_CATEGORY_BY_CATEGORYID = "DELETE FROM [Category] WHERE [CategoryID]=@CategoryId";
        private const string SQL_UPDATE_CATEGORY = "UPDATE [Category] SET [CategoryId]=@CategoryId,[CategoryName]=@CategoryName";
        private const string PARA_CATEGORY_CATEGORYID = "@CategoryId";
        private const string PARA_CATEGORY_CATEGORYNAME = "@CategoryName";

        #region ICategory 成员

        public IList<CategoryInfo> GetCategorys()
        {
            IList<CategoryInfo> list = new List<CategoryInfo>();
            using (SqlDataReader rdr = SqlHelper.ExecuteReader(SqlHelper.ConnectionString, CommandType.Text, SQL_SELECT_CATEGORYS, null))
            {
                while (rdr.Read())
                {
                    CategoryInfo categoryinfo = new CategoryInfo(Convert.ToInt32(rdr["CategoryId"].ToString().Trim()), rdr["CategoryName"].ToString().Trim());
                    list.Add(categoryinfo);
                }
            }
            return list;
        }

        public CategoryInfo GetCategoryByCategoryId(int CategoryId)
        {
            CategoryInfo info = null;
            SqlParameter parms = new SqlParameter(PARA_CATEGORY_CATEGORYID, SqlDbType.Int);
            parms.Value = CategoryId;
            using (SqlDataReader rdr = SqlHelper.ExecuteReader(SqlHelper.ConnectionString, CommandType.Text, SQL_SELECT_CATEGORY_BY_CATEGORYID, parms))
            {
                if (rdr.Read())
                {
                    info = new CategoryInfo(Convert.ToInt32(rdr["CategoryId"]), Convert.ToString(rdr["CategoryName"]).ToString().Trim());
                }
            }
            return info;
        }

        public int Insert(CategoryInfo categoryinfo)
        {
            SqlParameter[] parms = new SqlParameter[] {
                new SqlParameter(PARA_CATEGORY_CATEGORYID,SqlDbType.Int),
                new SqlParameter(PARA_CATEGORY_CATEGORYNAME,SqlDbType.VarChar)
            };
            parms[0].Value = categoryinfo.CategoryId;
            parms[1].Value = categoryinfo.CategoryName;

            int result = SqlHelper.ExecuteNonQuery(SqlHelper.ConnectionString, CommandType.Text, SQL_INSERT_CATEGORY, parms);
            return result;
        }

        public int Delete(CategoryInfo categoryinfo)
        {
            SqlParameter[] parms = new SqlParameter[] {
                new SqlParameter(PARA_CATEGORY_CATEGORYID,SqlDbType.Int)
            };
            parms[0].Value = categoryinfo.CategoryId;
            int result = SqlHelper.ExecuteNonQuery(SqlHelper.ConnectionString, CommandType.Text, SQL_DELETE_CATEGORY_BY_CATEGORYID, parms);
            return result;
        }

        public int Update(CategoryInfo categoryinfo)
        {

            SqlParameter[] parms = new SqlParameter[] {
                new SqlParameter(PARA_CATEGORY_CATEGORYID,SqlDbType.Int),
                new SqlParameter(PARA_CATEGORY_CATEGORYNAME,SqlDbType.VarChar)
            };
            parms[0].Value = categoryinfo.CategoryId;
            parms[1].Value = categoryinfo.CategoryName;

            int result = SqlHelper.ExecuteNonQuery(SqlHelper.ConnectionString, CommandType.Text, SQL_UPDATE_CATEGORY, parms);
            return result;
        }

        #endregion
    }
}