using System;
using System.Collections;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Text;

namespace Justin.FrameWork.Helper
{
    /// <summary>
    /// Sql访问数据库帮助类
    /// </summary>
    public abstract class SqlHelper
    {

        /// <summary>
        /// 如"data source=.;initial catalog=PrivilegeDB;integrated security=True;multipleactiveresultsets=True;"
        /// </summary>
        public static string ConnStr = "";
        public static int CommandTimeout = 600;

        private static Hashtable parmCache = Hashtable.Synchronized(new Hashtable());

        public static int ExecuteNonQuery(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);
                int val = cmd.ExecuteNonQuery();
                cmd.Parameters.Clear();
                return val;
            }
        }
        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;
        }
        public static int ExecuteNonQuery(SqlTransaction trans, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            SqlCommand cmd = new SqlCommand();
            cmd.CommandTimeout = 600;
            PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, commandParameters);
            int val = cmd.ExecuteNonQuery();
            cmd.Parameters.Clear();
            return val;
        }

        public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            SqlCommand cmd = new SqlCommand();
            try
            {
                PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
                SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                cmd.Parameters.Clear();
                return rdr;
            }

            catch
            {
                connection.Close();
                throw;
            }
        }
        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;
            }

        }
        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 DataTable ExecuteDataTable(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {

            SqlCommand cmd = new SqlCommand();
            PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
            SqlDataAdapter MyAdapter = new SqlDataAdapter();
            MyAdapter.SelectCommand = cmd;
            DataSet ds = new DataSet();
            MyAdapter.Fill(ds);
            cmd.Parameters.Clear();
            DataTable table = ds.Tables[0];
            ds.Dispose();
            return table;
        }
        public static DataTable ExecuteDataTable(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                SqlCommand cmd = new SqlCommand();

                try
                {
                    PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
                    SqlDataAdapter MyAdapter = new SqlDataAdapter();
                    MyAdapter.SelectCommand = cmd;
                    DataSet ds = new DataSet();
                    MyAdapter.Fill(ds);
                    cmd.Parameters.Clear();
                    DataTable table = ds.Tables[0];
                    ds.Dispose();
                    connection.Close();
                    return table;
                }
                catch
                {
                    connection.Close();
                    throw;
                }
            }
        }


        public static void CacheParameters(string cacheKey, params SqlParameter[] commandParameters)
        {
            parmCache[cacheKey] = commandParameters;
        }
        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;
        }
        private static void PrepareCommand(SqlCommand cmd, SqlConnection connection, SqlTransaction trans, CommandType cmdType, string cmdText, SqlParameter[] cmdParms)
        {
            if (connection.State != ConnectionState.Open)
                connection.Open();
            cmd.Connection = connection;
            cmd.CommandText = cmdText;
            cmd.CommandTimeout = CommandTimeout;
            if (trans != null)
                cmd.Transaction = trans;
            cmd.CommandType = cmdType;
            if (cmdParms != null)
            {
                foreach (SqlParameter parm in cmdParms)
                    cmd.Parameters.Add(parm);

            }

        }


        public static SqlConnection GetConnection(string connectionString)
        {
            return new SqlConnection(connectionString);
        }
    }
}
