Question

我试图创建一个简单的库存库存，但我很难根据mysql的输入和输出来获取剩余库存。

我真正需要的是减去input.quantity-output.quantity的总量，其中input.material等于output.material，如果total.quantity低于安全库存，则datagridview将突出显示该行。

conn = New MySqlConnection
 conn.ConnectionString = "server=localhost;userid=root;password=1234;database=inventory"
        Dim searchquery As String = "Select input.DeliveryDate as 'Delivery Date',input.Material, (sum(input.Quantity) - sum(output.Quantity)) as 'Remaining Stocks' where rawmaterialsinput.Material = output.Material, safetystandard.safetystocks from inventory.input, inventory.output, inventory.safetystandard"

        Dim commander As New MySqlCommand(searchquery, conn)
        Dim adapter As New MySqlDataAdapter(commander)

        inventorydata.Clear()

        adapter.Fill(inventorydata)

        inventoryDGV.DataSource = inventorydata

到目前为止，这是我正在尝试的代码，但没有希望。请帮助

我需要在datagridview中有4列，其中包含交货日期，原材料，剩余库存，安全库存。

Answer 1

conn.Open()
        conn = New MySqlConnection
        conn.ConnectionString = "server=localhost;userid=root;password=SOUTHEAST;database=reportingsystem"
        Dim searchquery As String = "Select reportingsystem.rawmaterialswarehouseandrawmaterials.Rawmaterials as 'Raw Material', reportingsystem.rawmaterialswarehouseandrawmaterials.safetystocks as 'Safety Stocks', (select sum(reportingsystem.rawmaterialsinput.Quantity) - sum(reportingsystem.rawmaterialsoutput.Quantity) from reportingsystem.rawmaterialsinput, reportingsystem.rawmaterialsoutput where reportingsystem.rawmaterialsinput.RawMaterial = reportingsystem.rawmaterialswarehouseandrawmaterials.Rawmaterials ) as 'Remaining Stocks' from reportingsystem.rawmaterialswarehouseandrawmaterials" ' JOIN reportingsystem.rawmaterialsinput.RawMaterial ON reportingsystem.rawmaterialswarehouseandrawmaterials.Rawmaterials = reportingsystem.rawmaterialsinput.RawMaterial ORDER BY reportingsystem.rawmaterialswarehouseandrawmaterials.Rawmaterials"
        Dim commander As New MySqlCommand(searchquery, conn)
        Dim adapter As New MySqlDataAdapter(commander)

        monitoringdata.Clear()

        adapter.Fill(monitoringdata)

        MonitoringDGV.DataSource = monitoringdata 

conn.close()

在此代码中，仅选择了3列。希望对您有帮助

来自mysql的Datagridview：简单库存

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