Data Tables and Adding new rows via Blueprint

Development Platform & Builds
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1

Essentially What i’m trying to do is Get datatable row info on “SavedLevelData” [Like saves your level, exp, steam id, name)

http://puu.sh/o32eY/3bf252c35d.jpg

and i can’t figure out how to make new rows, I want to make a new row with that playerid as the name (other stats are default and don’t need to be added other then display name

Also should I just put this on the controller so when the controller/character joins it will automatically attempt to create the players data? if i were to make this a function and put it on eventbeginplay?

I think a better way to phrase it, is i want to insert the characters info into the table.

2

Datatables cannot be modified. But you can use a simple array of the structure you would use for the datatable, and use the standard save system (save game slot).
Should it be enough for your needs?

3

No, only from what i get is the save game slot, is the same as a local save of your game and mine i’d like mysql but i can’t figure it out since i only do some blueprinting and not c++ (atleast the part with integrating it into the game.
Game would be multiplayer with a dedicated server.

4

It seems that if you want to make a connection with a MySQL database, you will have to make your own plugin in C++ :confused:
But I don’t see how you relate the UE datables and MySQL databases. They are very different things. You can see the UE datatable as a bank of data to drive values of your gameplay (for example, a loot table).

5

Yea, I thought they were practically small in engine databases where i could actually use them as a local mysql database. … well local for the server.

6

If you want to save your game, UE4 has a built-in you can use: https://docs.unrealengine.com/latest/INT/Gameplay/SaveGame/Blueprints/index.html

7

Would like to share how to add a row to a Data Table that is using blueprint structs.
Unfortunately this only works in editor and can’t do a packaged build with it.
In the header file:

	UFUNCTION(BlueprintCallable, BlueprintNativeEvent, meta = (CustomStructureParam = "Struct"))
	void AddToDataTable(UDataTable* inDatatable, FName inRowName, const FString& JsonStructString);

	UFUNCTION(BlueprintCallable, BlueprintNativeEvent)
	void RemoveDataTableRow(UDataTable* inDatatable, FName inRowName);

In the C++ file

void U::AddToDataTable_Implementation(UDataTable* inDatatable, FName inRowName,const FString& JsonStructString)
{
	FString localDatabaseString = inDatatable->GetTableAsJSON();
	FString localJsonStruct = JsonStructString;

	localDatabaseString.RemoveAt(localDatabaseString.Len()-1,1,true);
	localJsonStruct.RemoveAt(0,1,true);

	localJsonStruct = ",{\"Name\": \"" + inRowName.ToString() + "\"," + localJsonStruct;
	localDatabaseString = localDatabaseString + localJsonStruct + "]";
	
	inDatatable->CreateTableFromJSONString(localDatabaseString);
}

void U::RemoveDataTableRow_Implementation(UDataTable* inDatatable, FName inRowName)
{
	inDatatable->RemoveRow(inRowName);
}

Screenshot 2024-02-16 145305

Just enable Json Blueprint Utilities Plugin

8

After wasting a lot of time messing about with different suggestions I found short of using reflection this is the only method that actually works for adding rows to a table with data from C++. It appears the plugin is experimental so perhaps use with caution but it worked first time- Thanks you so much [danie_grobbelaar]

9

Unfortunately, I found out just now, that this only works in editor and cant do a packaged build with it.