SqlSugar/Src/Asp.NetCore2/SqlSugar/Entities/ConfigQuery.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
using System.Threading.Tasks;
namespace SqlSugar 
{
    public class ConfigQuery
    {
        public SqlSugarProvider Context { get; set; }
        public void SetTable<T>(Expression<Func<T, object>> keyExpression, Expression<Func<T, object>> valueTextExpression, string uniqueCode = null, Expression<Func<T, object>> whereExpression=null) 
        {
            lock (SqlFuncExtendsion.TableInfos)
            {
                var entity = this.Context.EntityMaintenance.GetEntityInfo<T>();
                ExpressionContext context = new ExpressionContext();
                var query = Context.Queryable<T>().QueryBuilder;
                var keyValue = query.GetExpressionValue(keyExpression, ResolveExpressType.FieldSingle).GetString();
                var ValueValue = query.GetExpressionValue(valueTextExpression, ResolveExpressType.FieldSingle).GetString();
                string where = null;
                if (whereExpression != null)
                {
                    where = query.GetExpressionValue(whereExpression, ResolveExpressType.WhereSingle).GetResultString();
                }
                context.MappingTables = this.Context.MappingTables;
                if (!SqlFuncExtendsion.TableInfos.Any(y => y.Type == typeof(T) && y.Code == uniqueCode))
                {
                    SqlFuncExtendsion.TableInfos.Add(new ConfigTableInfo()
                    {
                        Type = typeof(T),
                        TableName = entity.DbTableName,
                        Key = keyValue,
                        Value = ValueValue,
                        Where = where,
                        Parameter = query.Parameters,
                        Code = uniqueCode
                    });
                }
                else
                {
                    Check.Exception(true, "SetKeyValue error , entity & uniqueCode already exist");
                }
            }
        }
        public void SetTable<T>(Expression<Func<T, object>> key, Expression<Func<T, object>> value)
        {
            SetTable<T>(key,value, null,null);
        }

        public bool Any() 
        {
            return SqlFuncExtendsion.TableInfos.Any();
        }
    }

    public class ConfigTableInfo 
    { 
        public string Code { get; set; }
        public Type Type { get; set; }
        public string TableName { get; set; }
        public string Key { get; set; }
        public string Value { get; set; }
        public string Where { get; set; }
        public List<SugarParameter> Parameter { get; set; }
    }
}