废除实体类导入导出Xml/Json,核心库已直接支持
大石头 authored at 2017-08-20 14:22:33
7.83 KiB
X
using System;
using System.Collections.Generic;
using System.Data;
using XCode.Cache;
using XCode.Configuration;

namespace XCode
{
    /// <summary>数据实体操作接口</summary>
    public interface IEntityOperate
    {
        #region 主要属性
        /// <summary>实体类型</summary>
        Type EntityType { get; }

        /// <summary>实体会话</summary>
        IEntitySession Session { get; }
        #endregion

        #region 属性
        /// <summary>默认实体</summary>
        IEntity Default { get; set; }

        /// <summary>数据表元数据</summary>
        TableItem Table { get; }

        /// <summary>所有数据属性</summary>
        FieldItem[] AllFields { get; }

        /// <summary>所有绑定到数据表的属性</summary>
        FieldItem[] Fields { get; }

        /// <summary>字段名集合,不区分大小写的哈希表存储,外部不要修改元素数据</summary>
        ICollection<String> FieldNames { get; }

        /// <summary>唯一键,返回第一个标识列或者唯一的主键</summary>
        FieldItem Unique { get; }

        /// <summary>主字段。主字段作为业务主要字段,代表当前数据行意义</summary>
        FieldItem Master { get; }

        /// <summary>连接名</summary>
        String ConnName { get; set; }

        /// <summary>表名</summary>
        String TableName { get; set; }

        /// <summary>已格式化的表名,带有中括号等</summary>
        String FormatedTableName { get; }

        /// <summary>实体缓存</summary>
        IEntityCache Cache { get; }

        /// <summary>单对象实体缓存</summary>
        ISingleEntityCache SingleCache { get; }

        /// <summary>总记录数</summary>
        Int32 Count { get; }
        #endregion

        #region 创建实体、填充数据
        /// <summary>创建一个实体对象</summary>
        /// <param name="forEdit">是否为了编辑而创建,如果是,可以再次做一些相关的初始化工作</param>
        /// <returns></returns>
        IEntity Create(Boolean forEdit = false);

        /// <summary>加载记录集</summary>
        /// <param name="ds">记录集</param>
        /// <returns>实体数组</returns>
        IList<IEntity> LoadData(DataSet ds);
        #endregion

        #region 查找单个实体
        /// <summary>根据属性以及对应的值,查找单个实体</summary>
        /// <param name="name">名称</param>
        /// <param name="value">数值</param>
        /// <returns></returns>
        IEntity Find(String name, Object value);

        /// <summary>根据条件查找单个实体</summary>
        /// <param name="where"></param>
        /// <returns></returns>
        IEntity Find(Expression where);

        /// <summary>根据主键查找单个实体</summary>
        /// <param name="key"></param>
        /// <returns></returns>
        IEntity FindByKey(Object key);

        /// <summary>根据主键查询一个实体对象用于表单编辑</summary>
        /// <param name="key"></param>
        /// <returns></returns>
        IEntity FindByKeyForEdit(Object key);
        #endregion

        #region 静态查询
        /// <summary>获取所有实体对象。获取大量数据时会非常慢,慎用</summary>
        /// <returns>实体数组</returns>
        IList<IEntity> FindAll();

        /// <summary>
        /// 查询并返回实体对象集合。
        /// 表名以及所有字段名,请使用类名以及字段对应的属性名,方法内转换为表名和列名
        /// </summary>
        /// <param name="where">条件,不带Where</param>
        /// <param name="order">排序,不带Order By</param>
        /// <param name="selects">查询列</param>
        /// <param name="startRowIndex">开始行,0表示第一行</param>
        /// <param name="maximumRows">最大返回行数,0表示所有行</param>
        /// <returns>实体数组</returns>
        IList<IEntity> FindAll(String where, String order, String selects, Int64 startRowIndex, Int64 maximumRows);

        /// <summary>
        /// 查询并返回实体对象集合。
        /// 表名以及所有字段名,请使用类名以及字段对应的属性名,方法内转换为表名和列名
        /// </summary>
        /// <param name="where">条件,不带Where</param>
        /// <param name="order">排序,不带Order By</param>
        /// <param name="selects">查询列</param>
        /// <param name="startRowIndex">开始行,0表示第一行</param>
        /// <param name="maximumRows">最大返回行数,0表示所有行</param>
        /// <returns>实体数组</returns>
        IList<IEntity> FindAll(Expression where, String order, String selects, Int64 startRowIndex, Int64 maximumRows);
        #endregion

        #region 缓存查询
        /// <summary>查找所有缓存</summary>
        /// <returns></returns>
        IList<IEntity> FindAllWithCache();
        #endregion

        #region 取总记录数
        /// <summary>返回总记录数</summary>
        /// <returns></returns>
        Int64 FindCount();

        /// <summary>返回总记录数</summary>
        /// <param name="where">条件,不带Where</param>
        /// <param name="order">排序,不带Order By</param>
        /// <param name="selects">查询列</param>
        /// <param name="startRowIndex">开始行,0表示第一行</param>
        /// <param name="maximumRows">最大返回行数,0表示所有行</param>
        /// <returns>总行数</returns>
        Int32 FindCount(String where, String order, String selects, Int64 startRowIndex, Int64 maximumRows);

        /// <summary>返回总记录数</summary>
        /// <param name="where">条件,不带Where</param>
        /// <returns>总行数</returns>
        Int64 FindCount(Expression where);
        #endregion

        #region 事务
        /// <summary>开始事务</summary>
        /// <returns></returns>
        Int32 BeginTransaction();

        /// <summary>提交事务</summary>
        /// <returns></returns>
        Int32 Commit();

        /// <summary>回滚事务</summary>
        /// <returns></returns>
        Int32 Rollback();

        /// <summary>创建事务</summary>
        EntityTransaction CreateTrans();
        #endregion

        #region 辅助方法
        /// <summary>格式化关键字</summary>
        /// <param name="name">名称</param>
        /// <returns></returns>
        String FormatName(String name);

        /// <summary>
        /// 取得一个值的Sql值。
        /// 当这个值是字符串类型时,会在该值前后加单引号;
        /// </summary>
        /// <param name="name">字段</param>
        /// <param name="value">对象</param>
        /// <returns>Sql值的字符串形式</returns>
        String FormatValue(String name, Object value);

        /// <summary>格式化数据为SQL数据</summary>
        /// <param name="field">字段</param>
        /// <param name="value">数值</param>
        /// <returns></returns>
        String FormatValue(FieldItem field, Object value);
        #endregion

        #region 一些设置
        /// <summary>是否自增获取自增返回值。默认启用</summary>
        Boolean AutoIdentity { get; set; }

        /// <summary>是否允许向自增列插入数据。为免冲突,仅本线程有效</summary>
        Boolean AllowInsertIdentity { get; set; }

        /// <summary>自动设置Guid的字段。对实体类有效,可在实体类类型构造函数里面设置</summary>
        FieldItem AutoSetGuidField { get; set; }

        /// <summary>默认累加字段</summary>
        ICollection<String> AdditionalFields { get; }
        #endregion
    }
}