如何解决如何从C＃中的必需参数显示记录？
| SQL数据类型： 序列号/部件号-nvarchar（50）， 数量-整数 在DataTable上加载的记录：SerialNumber | PartNumber | Quantity
1 | 0001 | 20
2 | 0001 | 10
3 | 0001 | 20
5 | 0001 | 20
SerialNumber | PartNumber | Quantity
1 | 0001 | 20
3 | 0001 | 20
解决方法
好的，因此您删除了sql标记，并引入了FIFO作为要求。这澄清了事情。
您的答案的核心在这里：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
namespace SO_Forms_Demo
{
class SumFifo
{
DataTable _dt;
public SumFifo(DataTable dt)
{
_dt = dt;
}
public DataView GetAll()
{
return new DataView(_dt,null,DataViewRowState.CurrentRows);
}
public DataTable GetFIFO(string partNumber,int qty)
{
DataTable resultsTable = _dt.Clone();
//the generic collection type that represents a FIFO relationship is a Queue
Queue<DataRow> PartRows = new Queue<DataRow>(_dt.Select(\"partNumber = \'\" + partNumber + \"\'\",\"serialNumber\"));
//iterate through the queue adding rows and decreasing quantity till your requirment is met.
foreach (DataRow row in PartRows)
{
if (qty > 0)
{
resultsTable.ImportRow(row);
qty -= int.Parse(row[\"qty\"].ToString());
}
}
return resultsTable;
}
}
}
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace SO_Forms_Demo
{
public partial class FormFIFO : Form
{
DataTable _table;
public FormFIFO()
{
InitializeComponent();
_table = new DataTable(\"fifo\");
_table.Columns.Add(new DataColumn(\"serialNumber\"));
_table.Columns.Add(new DataColumn(\"partNumber\"));
_table.Columns.Add(new DataColumn(\"qty\"));
_table.AcceptChanges();
_table.Rows.Add(new object[3] { 1,\"0001\",20 });
_table.Rows.Add(new object[3] { 2,\"0002\",10 });
_table.Rows.Add(new object[3] { 3,20 });
_table.Rows.Add(new object[3] { 4,10 });
_table.Rows.Add(new object[3] { 5,20 });
_table.Rows.Add(new object[3] { 6,10 });
_table.AcceptChanges();
}
private void button1_Click(object sender,EventArgs e)
{
dataGridView1.DataSource = null;
SumFifo sumFifo = new SumFifo(_table);
dataGridView1.DataSource = sumFifo.GetAll();
}
private void button2_Click(object sender,EventArgs e)
{
dataGridView1.DataSource = null;
SumFifo sumFifo = new SumFifo(_table);
dataGridView1.DataSource = sumFifo.GetFIFO(textBox1.Text,int.Parse( textBox2.Text));
}
}
}
declare @partNum char(4)
SET @partNum = \'0001\'
declare @quantity int
SET @quantity = 40
declare @data TABLE (
SerialNumber int identity(1,1),PartNumber char(4),Quantity int
);
INSERT INTO @data (PartNumber,Quantity) VALUES (\'0001\',20);
INSERT INTO @data (PartNumber,10);
INSERT INTO @data (PartNumber,Quantity) VALUES (\'0002\',20);
WITH
cte_items as (
select * from @data where PartNumber = @partNum
),cte_perms as (
select cast(cast(SerialNumber as binary(4)) as varbinary(max)) as perm,1 as numentries
from cte_items
union all
select cast(n.SerialNumber as binary(4)) + p.perm,p.numentries + 1
from cte_perms p
join cte_items n on n.SerialNumber < cast(substring(perm,1,4) as int)
),cte_permlist as (
select row_number() over (order by (select 1)) as permnum,perm
from cte_perms
)
SELECT d1.SerialNumber,d1.PartNumber,d1.Quantity
FROM @data d1
INNER JOIN (
SELECT
cast(substring(p.perm,4*n.SerialNumber-3,4) as int) as SerialNumber
from cte_permlist p
join @data n on n.SerialNumber = n.SerialNumber
where cast(substring(p.perm,4) as int) != 0
and p.permnum = (
SELECT TOP 1 permutations.permnum
FROM @data d2
CROSS APPLY (
SELECT
p.permnum,cast(substring(p.perm,4) as int) as SerialNumber
from cte_permlist p
join @data n on n.SerialNumber = n.SerialNumber
where cast(substring(p.perm,4) as int) != 0
) permutations
WHERE PartNumber = @partNum
and permutations.SerialNumber = d2.SerialNumber
GROUP BY permutations.permnum
HAVING SUM(d2.Quantity) = @quantity
ORDER BY permnum desc
)
) pSn on pSn.SerialNumber = d1.SerialNumber
SerialNumber PartNumber Quantity
------------ ---------- -----------
1 0001 20
3 0001 20
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