protected override object MetaEqual(object v)
{
var re = "";
re = $"{ColumnExpress}{EqualFlag}{Convert2Express(v)}";
var rtn = new LinqDLR2SqlWhereOperator(re, ConditionValues);
return(rtn);
}
/// <summary>
/// 执行select的自定义处理
/// </summary>
/// <typeparam name="TLastItem"></typeparam>
/// <param name="pretable"></param>
public virtual void DoSelect <TLastItem>(LinqDLR2Sql <TLastItem> pretable)
{
if (pretable.LastOperation == LinqDLR2SQLOperation.SelectMany)
{
_selectmanytables.AddRange(pretable._selectmanytables);
_lastoperation = LinqDLR2SQLOperation.SelectMany;
_orderby = pretable._orderby;
}
else if (pretable.LastOperation == LinqDLR2SQLOperation.SelectJoin)
{
foreach (var item in pretable._jointables)
{
_jointables.Add(item.Key, item.Value);
}
_lastoperation = LinqDLR2SQLOperation.SelectJoin;
_orderby = pretable._orderby;
}
else
{
_lastoperation = LinqDLR2SQLOperation.Select;
_orderby = pretable._orderby;
}
_lastwhere = pretable.LastWhere;
//生成sql
if (LastOperation == LinqDLR2SQLOperation.Select)
{
var sql = "SELECT {prefix} {columns} FROM {tables} {alianname} {where} {orderby}";
var prefix = "";
var columns = GetColumnsSql();
var tables = Table;
var alianname = string.IsNullOrEmpty(AliasName) ? "" : $"as {AliasName}";
var where = LastWhere == null ? "" : $"WHERE {LastWhere.Result}";
var orderby = _orderby == "" ? "" : $"ORDER BY {_orderby}";
sql = sql.Replace("{prefix}", prefix)
.Replace("{columns}", columns)
.Replace("{tables}", tables)
.Replace("{alianname}", alianname)
.Replace("{where}", where)
.Replace("{orderby}", orderby);
if (LastWhere != null)
{
foreach (var item in LastWhere.ConditionValues)
{
_conditionvalues.Add(item.Key, item.Value);
}
}
_sql = sql;
}
else if (LastOperation == LinqDLR2SQLOperation.SelectMany)
{
var sql = "SELECT {prefix} {columns} FROM {tables} {where} {orderby}";
var prefix = "";
var columns = GetColumnsSql();
var tables = "";
foreach (LinqDLRTable table in SelectManyTables)
{
tables += $"{table.Table}{(string.IsNullOrEmpty(table.AliasName) ? "," : $" AS {table.AliasName},")}";
}
tables = tables == "" ? "" : tables.Substring(0, tables.Length - 1);
var where = LastWhere == null ? "" : $"WHERE {LastWhere.Result}";
var orderby = _orderby == "" ? "" : $"ORDER BY {_orderby}";
sql = sql.Replace("{prefix}", prefix)
.Replace("{columns}", columns)
.Replace("{tables}", tables)
.Replace("{where}", where)
.Replace("{orderby}", orderby);
if (LastWhere != null)
{
foreach (var item in LastWhere.ConditionValues)
{
_conditionvalues.Add(item.Key, item.Value);
}
}
_sql = sql;
}