using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.OleDb;

namespace Stone.Common
{
    public class MyOleDbDatabase
    {
        public static OleDbConnection m_oleconn = null;
        public static OleDbCommand m_olecmd = null;
        public static OleDbParameter m_olepar = null;
        /// <summary>
        /// 打开Access数据库的连接
        /// </summary>
        /// <param name="DbPath">要打开的Access数据库Mdb文件的路径</param>
        public static void OpenDatabase(string DbPath)
        {
            m_oleconn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + DbPath);
            m_oleconn.Open();

            m_olecmd = m_oleconn.CreateCommand();
        }

        /// <summary>
        /// 关闭Access数据库
        /// </summary>
        public static void CloseDatabase()
        {
            if (m_oleconn != null)
            {
                if (m_oleconn.State == ConnectionState.Open)
                {
                    m_oleconn.Close();
                }
            }
        }

        /// <summary>
        /// 添加一个参数进去
        /// </summary>
        /// <param name="ParameterName">参数名称</param>
        /// <param name="ParameterValue">参数值</param>
        public static void AddParameter(string ParameterName, string ParameterValue)
        {
            if (m_olepar == null)
            {
                m_olepar = m_olecmd.CreateParameter();
            }
            m_olepar = new OleDbParameter(ParameterName, ParameterValue);
            m_olecmd.Parameters.Add(m_olepar);
        }

        /// <summary>
        /// 执行一行SQL语句
        /// </summary>
        /// <param name="CommandText"></param>
        /// <returns>影响的记录的行数</returns>
        public static int ExecuteNonQuery(string CommandText)
        {
            int result = -1;
            m_olecmd.CommandText = CommandText;
            result = m_olecmd.ExecuteNonQuery();
            m_olecmd.Parameters.Clear();
            return result;
        }

        /// <summary>
        /// 执行一行SQL语句，返回一个DataSet
        /// </summary>
        /// <param name="CommandText"></param>
        /// <returns>返回一个DataSet</returns>
        public static DataSet ExecuteDataSet(string CommandText)
        {
            DataSet ds = new DataSet();
            m_olecmd.CommandText = CommandText;
            OleDbDataAdapter dap = new OleDbDataAdapter(m_olecmd);
            dap.Fill(ds);
            return ds;
        }
    }
}