using System;
using System.Collections.Generic;
using System.Linq.Expressions;

namespace Mtxfw.Utility.DataAccess
{
    /// <summary>
    /// 修改类
    /// </summary>
    public partial class Sql : DbHelperSqlSugar
    {
        /// <summary>
        /// 根据实体更新（主键要有值，主键是更新条件）
        /// </summary>
        /// <typeparam name="T">实体类名</typeparam>
        /// <param name="entity">实体类</param>
        /// <returns></returns>
        public int Update<T>(T entity) where T : class, new()
        {
            return Db.Updateable<T>(entity).ExecuteCommand();
        }
        /// <summary>
        /// 批量修改
        /// </summary>
        /// <typeparam name="T">实体类名</typeparam>
        /// <param name="entitys">实体类集合</param>
        /// <param name="predicate">修改条件 -> t => t.id == 1 && t.name == "aaaa"</param>
        /// <returns></returns>
        public int Update<T>(List<T> entitys, Expression<Func<T, bool>> predicate) where T : class, new()
        {
            return Db.Updateable<T>(entitys.ToArray()).Where(predicate).ExecuteCommand();
        }

        /// <summary>
        /// 根据表达示中的列更新，指定列并赋值的更新，比较常用
        /// </summary>
        /// <typeparam name="T">实体类名</typeparam>
        /// <param name="columns">表达式列 -> it => new Student() { Name = "a", CreateTime = DateTime.Now }</param>
        /// <param name="predicate">修改条件 -> it => it.Id == 11</param>
        /// <returns></returns>
        public int Update<T>(Expression<Func<T, T>> columns, Expression<Func<T, bool>> predicate) where T : class, new()
        {
            return Db.Updateable<T>().UpdateColumns(columns).Where(predicate).ExecuteCommand();
        }

        /// <summary>
        /// 4.2.3添加了WhereColumns 虽然XId不是主键但是 XId作为更新条件
        /// </summary>
        /// <typeparam name="T">实体名</typeparam>
        /// <param name="entity">实体类</param>
        /// <param name="predicate">指定字段 -> it=>new{it.XId}</param>
        /// <returns></returns>
        public int UpdateWhereColumn<T>(T entity, Expression<Func<T, object>> predicate) where T : class, new()
        {
            return Db.Updateable<T>(entity).WhereColumns(predicate).ExecuteCommand();
        }

        /// <summary>
        /// 更新 指定字段 以外的所有列 (主键要有值，主键是更新条件)
        /// </summary>
        /// <typeparam name="T">实体名</typeparam>
        /// <param name="entity">实体类</param>
        /// <param name="predicate">
        /// 指定字段 -> it => new { it.Name, it.TestId }
        /// 或者 it => it=="name"  更新NAME 以外的所有列
        /// </param>
        /// <returns></returns>
        public int UpdateIgnoreColumns<T>(T entity, Expression<Func<T, object>> predicate) where T : class, new()
        {
            return Db.Updateable<T>(entity).IgnoreColumns(predicate).ExecuteCommand();
        }

        /// <summary>
        /// 实体更新，并且给指定列重新赋值 ，其它列也插入
        /// </summary>
        /// <typeparam name="T">实体名</typeparam>
        /// <param name="entity">实体类</param>
        /// <param name="predicate">it => it.Name == (it.Name + 1)</param>
        /// <returns></returns>
        public int UpdateReSetValue<T>(T entity, Expression<Func<T, bool>> predicate) where T : class, new()
        {
            return Db.Updateable<T>(entity).ReSetValue(predicate).ExecuteCommand();
        }

        /// <summary>
        /// 批量更新，并且给指定列重新赋值 ，其它列也插入
        /// </summary>
        /// <typeparam name="T">实体名</typeparam>
        /// <param name="entity">实体类</param>
        /// <param name="predicate">it => it.Name == (it.Name + 1)</param>
        /// <returns></returns>
        public int UpdateReSetValue<T>(List<T> list, Expression<Func<T, bool>> predicate) where T : class, new()
        {
            return Db.Updateable(list).ReSetValue(predicate).ExecuteCommand();
        }

        /// <summary>
        /// 只更新指定字段并且 (entity不为空的情况)
        /// </summary>
        /// <typeparam name="T">实体名</typeparam>
        /// <param name="entity">实体类</param>
        /// <param name="columns">修改字段 -> it=>new {it.Name}</param>
        /// <param name="predicate">修改的值 -> it => it.Name == (it.Name + 1)</param>
        /// <returns></returns>
        public int UpdateColumnsReSetValue<T>(T entity, Expression<Func<T, object>> columns, Expression<Func<T, bool>> predicate) where T : class, new()
        {
            return Db.Updateable<T>(entity).UpdateColumns(columns).ReSetValue(predicate).ExecuteCommand();
        }

        /// <summary>
        /// 只更新指定字段并且 (entity为空的情况)
        /// </summary>
        /// <typeparam name="T">实体名</typeparam>
        /// <param name="columns">修改字段 -> it => new Student() { Name = it.Name+1}</param>
        /// <param name="predicate">条件 -> it => it.Id == 11</param>
        /// <returns></returns>
        public int UpdateColumnsReSetValueToWhere<T>(Expression<Func<T, T>> columns, Expression<Func<T, bool>> predicate) where T : class, new()
        {
#pragma warning disable 618
            return Db.Updateable<T>().UpdateColumns(columns).Where(predicate).ExecuteCommand();
#pragma warning restore 618
        }

        /// <summary>
        /// 修改一列数据
        /// </summary>
        public bool UpdateField<T>(Dictionary<string, object> dic) where T : class, new()
        {
            return Db.Updateable<T>(dic).ExecuteCommand() > 0;
        }
    }
}