Populate SQL table column from another table

Question

I have a jqGrid(latest free jqGrid version) table filled with data from the database(MS SQL) using a Java REST service. One of the jqGrid columns its a drop down list with 6 options.

My asignment is to create another database table that contains the Drop Down List values and using foreign keys / primary keys i have to automaticly populate the first table DDL values.

I am failing to understand the logic behind it. Can someone expain this to me? How can i achieve this. Do i only send a ID from jqGrid and depending on that ID(1,2,..,6) it chooses what to set in table#1 DDL column(comparing the id sent with the ID's of the table that contains the DDL Values)?

I am getting the feeling i am not expressing myself well... Hope you guys understand me.

Answer 1

We can start with the database table. It could look like

CREATE TABLE dbo.OrderStatus (
    Id int IDENTITY NOT NULL,
    Name nvarchar(100) NOT NULL,
    CONSTRAINT PK_LT_OrderStatus PRIMARY KEY CLUSTERED (Id),
    CONSTRAINT UC_LT_OrderStatus_Name UNIQUE NONCLUSTERED (Name)
)

It allows to address any Item of such OrderStatus table by Id or by Name . The UNIQUE CONSTRAINT don't permit to add name duplicates. Another table Order can have column

CREATE TABLE dbo.Order (
    Id int IDENTITY NOT NULL,
    OrderStatusId int NOT NULL,
    ...
)

ALTER TABLE dbo.Order  WITH CHECK ADD  CONSTRAINT FK_Order_OrderStatus
FOREIGN KEY(OrderStatusId) REFERENCES dbo.OrderStatus (Id)

During filling the grid with the data you have two main options: using OrderStatusId in the data or the usage of the corresponding Name from dbo.OrderStatus :

SELECT Id,OrderStatusId, ...  FROM dbo.Order

or

SELECT Id,os.Name AS OrderStatus, ...
FROM dbo.Order AS o
    INNER JOIN dbo.OrderStatus AS os ON os.Id=o.OrderStatusId

If you decide to fill the grid with ids ( OrderStatusId values) then you will have to use formatter: "select" to display the text in the corresponding column (see here ). It required that you would have to have editoptions.value filled with all different values from dbo.OrderStatus . The best way to implement this would be to extend the response from the server for filling the grid with your custom data and to use beforeProcessing to set editoptions.value . I described the scenario in the answer . I'll remind you it below.

Let us the response from the server looks like

{
    "rows": [{...}, {...}]
}

If the returned data looks just like

[{...}, {...}]

then you should include the wrapping. I suggest that you made

SELECT Id,Name FROM dbo.OrderStatus

additionally to making the main select from dbo.Order ( SELECT * FROM dbo.Order ) and you place both results in the server response:

{
    "orderStatus": [{"id":1, "name":"Pending"}, ...],
    "rows": [{...}, {...}]
}

To process orderStatus you need to add the following beforeProcessing , which read orderStatus and set editoptions.value of the orderStatus column of the grid:

beforeProcessing: function (response) {
    var $self = $(this), orderStatus = response.orderStatus, i, values = "";
    if (orderStatus != null && orderStatus.length > 0) {
        for (i = 0; i < orderStatus.length; i++) {
            if (values.length > 0) {
                values += ";";
            }
            values += orderStatus[i].id + ":" + orderStatus[i].name;
        }
        $self.jqGrid("setColProp", "orderStatus", {
            editoptions {
                value: values
            }
        });
        if (this.ftoolbar) { // filter toolbar exist
            $self.jqGrid("destroyFilterToolbar");
            $self.jqGrid("filterToolbar");
        }
    }
}

The above code is not tested, but I hope that the main idea should be clear from it.