using System;
using System.Collections.Generic;
using System.Text;
using Ant.Frame;
using Ant.Data;
using Ant.Descriptors;

namespace Ant.ORM
{

    public abstract class QueryCommandBuilder
    {

        private Type entityType;

        /// <summary>
        /// 实体类型
        /// </summary>
        public Type EntityType
        {
            get { return entityType; }
            set { entityType = value; }
        }
        private SqlEnum _sqltype;
        /// <summary>
        /// SQL语句类型
        /// </summary>
        public SqlEnum SqlType
        {
            get { return _sqltype; }
            set { _sqltype = value; }
        }
        private EntityPersistType persistType;
        /// <summary>
        /// 操作类型
        /// </summary>
        public EntityPersistType PersistType
        {
            get { return persistType; }
            set { persistType = value; }
        }

        //private MakeShowFields _selectfield ;
        ///// <summary>
        ///// 显示的列
        ///// </summary>
        //public MakeShowFields SelectField
        //{
        //    get { return _selectfield; }
        //    set { _selectfield = value; }
        //}

        private string _showfield;
        /// <summary>
        /// 显示的列
        /// </summary>
        public string ShowField
        {
            get { return _showfield; }
            set { _showfield = value; }
        }

        private MetaData _md;
        /// <summary>
        /// 实体属性
        /// </summary>
        public MetaData Md
        {
            get { return _md; }
            set { _md = value; }
        }
        
        private FieldValueCollection fields;
        /// <summary>
        /// 实体属性集合
        /// </summary>
        public FieldValueCollection Fields
        {
            get { return fields; }
            set { fields = value; }
        }
        private Type _childObjects;//子对象集合
        /// <summary>
        /// 子对象类型
        /// </summary>
        public Type ChildObjects
        {
            get { return this._childObjects; }
            set { _childObjects = value; }
        }
        private QueryCommand _QueryComm;
        /// <summary>
        /// 实体属性集合
        /// </summary>
        public QueryCommand QueryComm
        {
            get { return _QueryComm; }
            set { _QueryComm = value; }
        }
        private string _Top;
        /// <summary>
        /// 
        /// </summary>
        public string Top
        {
            get { return _Top; }
            set { _Top = value; }
        }

        private int pageNo = 0;
        /// <summary>
        /// 第几页
        /// </summary>
        public int PageNo
        {
            get { return pageNo; }
            set { pageNo = value; }
        }
        private int pageSize = 0;

        /// <summary>
        /// 每页显示的条数
        /// </summary>
        public int PageSize
        {
            get { return pageSize; }
            set { pageSize = value; }
        }
        private bool isPaging = false;


        private string _moduleName;
        /// <summary>
        /// 模块
        /// </summary>
        public string ModuleName
        {
            get { return _moduleName; }
            set { _moduleName = value; }
        }
        /// <summary>
        /// 拼接查询条件
        /// </summary>
        public IPredicate Predicate
        {
            get;
            set;
        }
        /// <summary>
        /// 排序
        /// </summary>
        public IList<ISort> Sort
        {
            get;
            set;
        }
        /// <summary>
        /// 是否分页
        /// </summary>
        public bool IsPaging
        {
            get { return isPaging; }
            set { isPaging = value; }
        }

        /// <summary>
        /// 拼接SQL字符串
        /// </summary>
        public static string DbParmChar { get; set; }

        /// <summary>
        /// 创建不同解析SQL语句
        /// </summary>
        /// <param name="databaseType">数据库类型</param>
        /// <returns></returns>
        public static QueryCommandBuilder Instance(DatabaseType databaseType)
        {
            QueryCommandBuilder qcb = null;
            switch (databaseType)
            {
                case DatabaseType.MSSQLServer:
                    {
                        DbParmChar = "@";
                        qcb = new MSSqlQueryCommandBuilder();
                    }
                    break;
                case DatabaseType.OleDb:
                    {
                        DbParmChar = "@";
                        qcb = new OleDbQueryCommandBuilder();
                    }
                    break;
                case DatabaseType.MySQL:
                    {
                        DbParmChar = "@";
                        qcb = new MySqlQueryCommandBuilder();
                    }
                    break;
                case DatabaseType.Oracle:
                    {
                        DbParmChar = ":";
                        qcb = new OracleQueryCommandBuilder();
                    }
                    break;
                case DatabaseType.SQLite:
                    {
                        DbParmChar = "@";
                        qcb = new SQLiteQueryCommandBuilder();//后期再扩展
                    }
                    break;
            }
            return qcb;
        }

       

        /// <summary>
        /// 返回查询对象
        /// </summary>
        /// <returns></returns>
        public abstract QueryCommand GetQueryCommand();//映射到DataBaise文件夹中去找它对应的数据库连接方式｛MSSqlQueryCommandBuilder.cs｝

    }
}