tk/FreeSql
1
0
Fork 0
mirror of https://github.com/nsnail/FreeSql.git synced 2025-06-18 20:08:15 +08:00
Code Issues Packages Projects Releases Wiki Activity

- 增加 lambda 表达式树解析子查询 ToList + string.Join() 产生 类似 group_concat 的效果（适配了 sqlserver/pgsql/oracle/mysql/sqlite/达梦/金仓) #405；

Browse Source
This commit is contained in:
28810
2020-08-08 16:18:10 +08:00
parent 1a8c7ce86d
commit b3ec6cdf8d
30 changed files with 614 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
Providers/FreeSql.Provider.SqlServer/SqlServerExpression.cs
View File

@ -284,19 +284,19 @@ namespace FreeSql.SqlServer
}).ToArray();
return string.Format(expArgs0, expArgs);
case "Join":
if (exp.IsStringJoin(out var joinExpArgs1, out var joinExpArgs1Args0))
if (exp.IsStringJoin(out var tolistObjectExp, out var toListMethod, out var toListArgs1))
{
var newToListArgs0 = Expression.Call(joinExpArgs1.Object, joinExpArgs1.Method,
var newToListArgs0 = Expression.Call(tolistObjectExp, toListMethod,
Expression.Lambda(
Expression.Call(
typeof(string).GetMethod("Concat", new[] { typeof(object), typeof(object) }),
Expression.Convert(joinExpArgs1Args0.Body, typeof(object)),
Expression.Convert(exp.Arguments[0], typeof(object))),
joinExpArgs1Args0.Parameters));
Expression.Convert(exp.Arguments[0], typeof(object)),
Expression.Convert(toListArgs1.Body, typeof(object))),
toListArgs1.Parameters));
var newToListSql = getExp(newToListArgs0);
if (string.IsNullOrEmpty(newToListSql) == false && newToListSql.StartsWith("(") && newToListSql.EndsWith(")"))
{
newToListSql = $"{newToListSql.Substring(0, newToListSql.Length - 1)} FOR XML PATH(''))";
newToListSql = $"stuff({newToListSql.Substring(0, newToListSql.Length - 1)} FOR XML PATH('')),1,len({getExp(exp.Arguments[0])}),'')";
return newToListSql;
}
}