using System;
using System.Collections;
using BP.DA;

namespace BP.En
{
    /// <summary>
    /// 属性列表
    /// </summary>
    public class EntityOIDAttr
    {
        /// <summary>
        /// OID
        /// </summary>
        public const string OID = "OID";
    }
    /// <summary>
    /// 属性列表
    /// </summary>
    public class EntityOIDMyFileAttr : EntityOIDAttr
    {
        /// <summary>
        /// MyFileName
        /// </summary>
        public const string MyFileName = "MyFileName";
        /// <summary>
        /// MyFilePath
        /// </summary>
        public const string MyFilePath = "MyFilePath";
        /// <summary>
        /// MyFileExt
        /// </summary>
        public const string MyFileExt = "MyFileExt";
    }
    /// <summary>
    /// OID实体,只有一个实体这个实体只有一个主键属性。
    /// </summary>
    abstract public class EntityOID : Entity
    {
        #region 属性
        /// <summary>
        /// 是否是自动增长列
        /// </summary>
        public virtual bool IsInnKey
        {
            get
            {
                return false;
            }
        }
        /// <summary>
        /// 主键
        /// </summary>
        public override string PK
        {
            get
            {
                return "OID";
            }
        }
        /// <summary>
        /// OID, 如果是空的就返回 0 . 
        /// </summary>
        public int OID
        {
            get
            {
                return this.GetValIntByKey(EntityOIDAttr.OID);
            }
            set
            {
                this.SetValByKey(EntityOIDAttr.OID, value);
            }
        }
        #endregion

        #region 构造函数
        /// <summary>
        /// 构造一个空实例
        /// </summary>
        protected EntityOID()
        {
        }
        /// <summary>
        /// 根据OID构造实体
        /// </summary>
        /// <param name="oid">oid</param>
        protected EntityOID(int oid)
        {
            this.SetValByKey(EntityOIDAttr.OID, oid);
            this.Retrieve();
        }
        #endregion

        #region override 方法
        public override int DirectInsert()
        {
            this.OID = DBAccess.GenerOID();
            return base.DirectInsert();
        }
        public void InsertAsNew()
        {
            this.OID = 0;
            this.Insert();
        }
        public override bool IsExits
        {
            get
            {
                if (this.OID == 0)
                    return false;

                try
                {
                    // 生成数据库判断语句。
                    string selectSQL = "SELECT " + this.PKField + " FROM " + this.EnMap.PhysicsTable + " WHERE OID=" + this.HisDBVarStr + "v";
                    Paras ens = new Paras();
                    ens.Add("v", this.OID);

                    // 从数据库里面查询，判断有没有。
                    switch (this.EnMap.EnDBUrl.DBUrlType)
                    {
                        case DBUrlType.AppCenterDSN:
                            return DBAccess.IsExits(selectSQL, ens);
                        default:
                            throw new Exception("没有设计到。" + this.EnMap.EnDBUrl.DBType);
                    }
                }
                catch (Exception ex)
                {
                    this.CheckPhysicsTable();
                    throw ex;
                }

                /* DEL BY PENG 2008-04-27
				// 生成数据库判断语句。
				string selectSQL="SELECT "+this.PKField + " FROM "+ this.EnMap.PhysicsTable + " WHERE " ;
				switch(this.EnMap.EnDBUrl.DBType )
				{
					case DBType.MSSQL:
						selectSQL +=SqlBuilder.GetKeyConditionOfMS(this);
						break;
					case DBType.Access:
						selectSQL +=SqlBuilder.GetKeyConditionOfOLE(this);
						break;
					case DBType.Oracle:
						selectSQL +=SqlBuilder.GetKeyConditionOfOracle(this);
						break; 
					default:
						throw new Exception("没有设计到。"+this.EnMap.EnDBUrl.DBType);
				}

				// 从数据库里面查询，判断有没有。
				switch(this.EnMap.EnDBUrl.DBUrlType )
				{
					case DBUrlType.AppCenterDSN:
						return DBAccess.IsExits( selectSQL) ;
					case DBUrlType.DBAccessOfMSSQL:
						return DBAccessOfMSSQL.IsExits( selectSQL) ;
					case DBUrlType.DBAccessOfOLE:
						return DBAccessOfOLE.IsExits( selectSQL) ;
					case DBUrlType.DBAccessOfOracle:
						return DBAccessOfOracle.IsExits( selectSQL) ;
					default:
						throw new Exception("没有设计到。"+this.EnMap.EnDBUrl.DBType);				
				}
                */
            }
        }
        /// <summary>
        /// 删除之前的操作。
        /// </summary>
        /// <returns></returns>
        protected override bool beforeDelete()
        {
            if (base.beforeDelete() == false)
                return false;
            try
            {
                if (this.OID < 0)
                    throw new Exception("@实体[" + this.EnDesc + "]没有被实例化，不能Delete().");
                return true;
            }
            catch (Exception ex)
            {
                throw new Exception("@[" + this.EnDesc + "].beforeDelete err:" + ex.Message);
            }
        }
        protected override bool beforeUpdateInsertAction()
        {
            return base.beforeUpdateInsertAction();
        }

        /// <summary>
        /// beforeInsert 之前的操作。
        /// </summary>
        /// <returns></returns>
        protected override bool beforeInsert()
        {
            if (this.OID == -999)
                return base.beforeInsert();

            if (this.OID > 0)
                throw new Exception("@[" + this.ToString() + " - " + this.EnDesc + "], 实体已经被实例化 OID=[" + this.OID + "]，不能Insert.");

            if (this.IsInnKey)
                this.OID = -1;
            else
                this.OID = DBAccess.GenerOID();

            return base.beforeInsert();

        }
        /// <summary>
        /// beforeUpdate
        /// </summary>
        /// <returns></returns>
        protected override bool beforeUpdate()
        {
            if (base.beforeUpdate() == false)
                return false;

            /*
			if (this.OID <= 0 )
				throw new Exception("@实体["+this.EnDesc+"]没有被实例化，不能Update().");
				*/
            return true;
        }
        protected virtual string SerialKey
        {
            get
            {
                return "OID";
            }
        }

        #endregion

        #region public 方法
        /// <summary>
        /// 作为一个新的实体保存。
        /// </summary>
        public void SaveAsNew()
        {
            try
            {
                this.OID = DBAccess.GenerOIDByKey32(this.SerialKey);
                this.RunSQL(SqlBuilder.Insert(this));
            }
            catch (System.Exception ex)
            {
                this.CheckPhysicsTable();
                throw ex;
            }
        }
        /// <summary>
        /// 按照指定的OID Insert.
        /// </summary>
        public void InsertAsOID(int oid)
        {
            this.SetValByKey("OID", oid);
            try
            {
                this.RunSQL(SqlBuilder.Insert(this));
            }
            catch (Exception ex)
            {
                this.CheckPhysicsTable();
                throw ex;
            }
        }
        public void InsertAsOID(Int64 oid)
        {
            try
            {
                //先设置一个标记值，为的是不让其在[beforeInsert]产生oid.
                this.SetValByKey("OID", -999);

                //调用方法.
                this.beforeInsert();

                //设置主键.
                this.SetValByKey("OID", oid);

                this.RunSQL(SqlBuilder.Insert(this));

                this.afterInsert();
            }
            catch (Exception ex)
            {
                this.CheckPhysicsTable();
                throw ex;
            }
        }
        /// <summary>
        /// 按照指定的OID 保存
        /// </summary>
        /// <param name="oid"></param>
        public void SaveAsOID(int oid)
        {
            this.SetValByKey("OID", oid);
            if (this.Update() == 0)
                this.InsertAsOID(oid);
            //         this.SetValByKey("OID",oid);
            // if (this.IsExits==false)
            //	this.InsertAsOID(oid);
            //this.Update();
        }
        #endregion
    }
    abstract public class EntitiesOID : Entities
    {
        /// <summary>
        /// 构造
        /// </summary>
		public EntitiesOID()
        {

        }

        #region 查询方法, 专用于与语言有关的实体
        /// <summary>
        /// 查询出来, 所有中文的实例 . 
        /// </summary>
        public void RetrieveAllCNEntities()
        {
            this.RetrieveByLanguageNo("CH");
        }
        /// <summary>
        /// 按语言查询。 
        /// </summary>
        public void RetrieveByLanguageNo(string LanguageNo)
        {
            QueryObject qo = new QueryObject(this);
            qo.AddWhere("LanguageNo", LanguageNo);
            qo.DoQuery();
        }
        #endregion
    }
}