C# 将sql case语句放入组合框
我有这样一个sql case语句C# 将sql case语句放入组合框,c#,.net,sql-server,C#,.net,Sql Server,我有这样一个sql case语句 select Distinct y.SupplierID,y.Name,y.AddWho , "StatusDesc=CASE when y.status='N' then 'NEW' " & _ "when y.status='B' then 'BLACKLISTED'" & _ "when y.status='Q' then 'QUALIFIED'" & _ "whe
select Distinct y.SupplierID,y.Name,y.AddWho ,
"StatusDesc=CASE when y.status='N' then 'NEW' " & _
"when y.status='B' then 'BLACKLISTED'" & _
"when y.status='Q' then 'QUALIFIED'" & _
"when y.status='R' then 'REJECTED' end , " & _
"FlowStatusDesc = CASE when y.flowstatus='RC' then 'UNDER REVIEW'" & _
"when y.flowstatus='PE' then 'POTENTIAL EXCLUSIVE'" & _
"when y.flowstatus='PO' then 'POTENTIAL ORDINARY' ELSE '' end," & _
"OrderNo=case when y.status='N' and flowstatus='' then '1'" & _
"when y.status='N' and y.flowstatus<>'' then '2' " & _
"when y.status='R' and y.flowstatus='' then '3'" & _
"when y.status='R' and y.flowstatus<>'' then '4'" & _
"when y.status='Q' and y.flowstatus='' then '5'" & _
"when y.status='Q' and y.flowstatus<>'' then '6'" & _
"when y.status='B' and y.flowstatus='' then '7'" & _
"when y.status='B' and y.flowstatus<>'' then '8' else '9' end " & _
"from AP_Supplier y" & _
" left outer join SC_User u on y.addwho=u.userid " & _
"left outer join SC_Company co on co.companycode=u.companycode " & _
"where flowstatus is not null " & _
"group by y.SupplierID,y.name,y.status,y.flowstatus,y.addwho " & _
"order by orderno"
如何将所有的case语句条件(如new、qualified、registered和flowstatus)加载到vb.net上的组合框中?你能给我举个例子吗?我已经尝试了很长时间。谢谢。有很多方法可以做到这一点,第一种是从列表中填充组合框。在这种情况下,您应该有一个类,类似于:
public class Status(){
public string Symbol { get; set; } // or Id
public string Name { get; set; }
}
然后列出您的状态:
var ds = new List<Status>(){
new Status { Symbol = "N", Name = "New" },
new Status { Symbol = "Q", Name = "Qualified" },
....
};
第二种方法是创建一个表或临时表,其中包含如下值列表:
CREATE TABLE Statuses(StatusId INT,
StatusSymbol VARCHAR(2),
StatusName VARCHAR(20));
INSERT INTO Statuses(StatusId, StatusSymbol, STatusName) VALUES
(1, 'N' , 'NEW'),
(2, 'B' , 'BLACKLISTED'),
(3, 'Q' , 'QUALIFIED'),
(4, 'R' , 'REJECTED'),
(5, 'UR', 'UNDER REVIEW'),
(6, 'PE', 'POTENTIAL EXCLUSIVE'),
(7, 'PO', 'POTENTIAL ORDINARY');
然后,在使用从该表中读取并填充的数据源之前,可以以相同的方式使用它。但是这个解决方案将使您的查询更容易。您可以这样连接此表:
SELECT DISTINCT
y.SupplierID,
y.Name,
y.AddWho,
StatusDesc = s.STatusName,
FlowStatusDesc = CASE WHEN ... END
orderno = CASE WHEN ...
FROM AP_Supplier y
INNER JOIN statuses s ON y.status = s.StatusSymbol
LEFT JOIN SC_User u ON y.addwho = u.userid
LEFT JOIN SC_Company co ON co.companycode = u.companycode
WHERE flowstatus IS NOT NULL
GROUP BY y.SupplierID,
y.name,
y.status,
y.flowstatus,
y.addwho
ORDER BY orderno;
请注意:您的表需要以这种方式进行重构。如果可能的话,最好去掉这些状态名称,并在第二个表中添加一个新的表状态,其id为外键。是否要将这些状态的单独列表加载到组合框中?不是来自这个查询?我的意思是,将有2个组合框,每个组合框。对于状态,它将是新的、合格的、被列入黑名单的和被拒绝的,而对于flowstatus,正在审查的,可能是普通的和可能是排他的。
SELECT DISTINCT
y.SupplierID,
y.Name,
y.AddWho,
StatusDesc = s.STatusName,
FlowStatusDesc = CASE WHEN ... END
orderno = CASE WHEN ...
FROM AP_Supplier y
INNER JOIN statuses s ON y.status = s.StatusSymbol
LEFT JOIN SC_User u ON y.addwho = u.userid
LEFT JOIN SC_Company co ON co.companycode = u.companycode
WHERE flowstatus IS NOT NULL
GROUP BY y.SupplierID,
y.name,
y.status,
y.flowstatus,
y.addwho
ORDER BY orderno;