oracle 查询时的 LINQ 案例

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时间:2020-09-19 01:55:16  来源:igfitidea点击:

LINQ Case When Query

c#.netsqllinqoracle

提问by ehsan

I have an SQL query like below in Oracle SQL syntax and I want it in LINQ equal.

我在 Oracle SQL 语法中有一个像下面这样的 SQL 查询,我希望它在 LINQ 中相等。

Select Case When tbl.Id=1 then 1 else NULL End as col1,
Case When tbl.Id=2 then 2 else NULL End as col2,
Case When tbl.Id=3 then 3 else NULL End as col3
From Table1 tbl

回答by Daniel Hilgarth

You would use the conditional operatorin the Select:

你可以使用条件运算符Select

var result = 
    table1.Select(x => new
                       {
                           col1 = x.Id == 1 ? (int?)1 : null,
                           col3 = x.Id == 2 ? (int?)2 : null,
                           col3 = x.Id == 3 ? (int?)3 : null
                       });

回答by AgentFire

var items = from item in Table1
            select new
            {
                 col1 = item.Id == 1 ? (int?)1 : null,
                 col3 = item.Id == 2 ? (int?)2 : null,
                 col3 = item.Id == 3 ? (int?)3 : null)
            };