Getting Started

A3DB — Worked Example

This guide walks through building a simple Arma 3 mod that uses A3DB to persist player stats between missions.

---

1. Project Setup

Your mod needs A3DB and CBA_A3 as dependencies.

# .hemtt/project.toml (your addon)
name = "my-stats"
prefix = "mystats"
mainprefix = "z"

[files]
include = [
    "mod.cpp",
    "meta.cpp",
]

2. CfgPatches

// addons/main/config.cpp
class CfgPatches {
    class mystats_main {
        name = "My Stats";
        author = "Me";
        requiredVersion = 2.02;
        requiredAddons[] = {"a3db_main", "a3db_sql", "cba_main"};
        units[] = {};
        weapons[] = {};
    };
};

class CfgFunctions {
    class mystats {
        class main {
            file = QPATHTO_FOLDER(main);
            class postInit {};
        };
    };
};

3. Initialize Database

// addons/main/fn_postInit.sqf
#include "script_component.hpp"

// Create the stats table once
["mystats", "CREATE TABLE IF NOT EXISTS player_stats (
    uid      STRING PRIMARY KEY,
    kills    INT DEFAULT 0,
    deaths   INT DEFAULT 0,
    captures INT DEFAULT 0
)"] call a3db_fnc_execute;

4. Record Events

// addons/main/fn_onKill.sqf
#include "script_component.hpp"

params ["_killer", "_victim"];

private _uid = getPlayerUID _killer;
// Use a SELECT to check before inserting
_sql = format ["SELECT COUNT(*) FROM player_stats WHERE uid = '%1'", _uid];
private _exists = ([_sql] call a3db_fnc_execute) select 2 select 0;
if (_exists == "0") then {
    _sql = format [
        "INSERT INTO player_stats (uid, kills) VALUES ('%1', 1)",
        _uid
    ];
    [_sql] call a3db_fnc_execute;
};

// Insert if first kill
_sql = format [
    "INSERT OR IGNORE INTO player_stats (uid, kills) VALUES ('%1', 1)",
    _uid
];
[_sql] call a3db_fnc_execute;

5. Query Stats

// addons/main/fn_getStats.sqf
#include "script_component.hpp"

params ["_uid"];

private _sql = format [
    "SELECT kills, deaths, captures FROM player_stats WHERE uid = '%1'",
    _uid
];
_result = [_sql] call a3db_fnc_execute;
// Returns [code, "OK", [["kills","deaths","captures"],[42,7,3]]]
_result

6. Fuzzy Search

Search player names or items with typo tolerance:

_results = ["
    SELECT name, uid FROM players WHERE name %% 'joh'
"] call a3db_fnc_execute;
// Matches "John", "Johnson", "Johansson" via trigram similarity

7. Save & Load

Persist the database between game sessions:

// Server-side persistence
if (isServer) then {
    // Auto-load on mission start
    ["my_stats.bin"] call a3db_fnc_load;

    // Auto-save on mission end
    addMissionEventHandler ["Ended", {
        ["my_stats.bin"] call a3db_fnc_save;
    }];
};

8. Transactions

Group multiple writes atomically:

["BEGIN"] call a3db_fnc_execute;

["INSERT INTO log (event, time) VALUES ('mission_start', '2026-07-24')"] call a3db_fnc_execute;
["UPDATE server_stats SET missions = missions + 1"] call a3db_fnc_execute;

["COMMIT"] call a3db_fnc_execute; // All or nothing

9. Export Data

// Export to CSV for spreadsheets
_result = ["player_stats"] call a3db_fnc_exportCSV;

// Full SQL dump for backup
_backup = [] call a3db_fnc_exportSQL;

10. Full Example Mission

my_mission.Altis/
├── initServer.sqf
└── initPlayerLocal.sqf

initServer.sqf:

// Create tables at mission start
["stats", "CREATE TABLE IF NOT EXISTS session_stats (
    uid STRING PRIMARY KEY,
    score INT
)"] call a3db_fnc_execute;

// Restore previous session data if available
["session_data.bin"] call a3db_fnc_load;

// Save when mission ends
addMissionEventHandler ["Ended", {
    ["session_data.bin"] call a3db_fnc_save;
}];

initPlayerLocal.sqf:

// Insert player on join
private _sql = format [
    "INSERT INTO session_stats (uid, score) VALUES ('%1', 0)",
    getPlayerUID player
];
// Ignore PK conflict if player already exists
_sql call a3db_fnc_execute;

// Query current scores
_result = ["SELECT uid, score FROM session_stats ORDER BY score DESC LIMIT 10"] call a3db_fnc_execute;
systemChat format ["Scores: %1", _result];

---

A3DB API Reference

All functions accept an optional extension name as the last parameter (defaults to "a3db"). All return a parsed JSON array:

[code, "OK|ERR_*", data]

Function	Purpose	Example
a3db_fnc_execute(sql)	Run SQL statements	["SELECT * FROM t"] call a3db_fnc_execute
a3db_fnc_loadJSON(table, data)	Import JSON data or file	["items", loadFile "data.json"] call a3db_fnc_loadJSON
a3db_fnc_exportJSON(table)	Export table as JSON	["items"] call a3db_fnc_exportJSON
a3db_fnc_exportCSV(table)	Export table as CSV	["items"] call a3db_fnc_exportCSV
a3db_fnc_exportSQL()	Full DB SQL dump	[] call a3db_fnc_exportSQL
a3db_fnc_dumpSQL()	Same as exportSQL	[] call a3db_fnc_dumpSQL
a3db_fnc_save(path)	Save DB to binary file	["data.bin"] call a3db_fnc_save
a3db_fnc_load(path)	Restore DB from file	["data.bin"] call a3db_fnc_load

External TCP Connection

A3DB exposes a simple TCP interface for external tools. Call once from SQF:

// Start listener on port 33306 (default)
["listen", []] call a3db_fnc_execute;     // default port
["listen", ["33307"]] call a3db_fnc_execute; // custom port

Then from any external tool (Python, Node, bash):

import socket
s = socket.socket()
s.connect(("127.0.0.1", 33306))
s.sendall(b"SELECT name, score FROM players ORDER BY score DESC LIMIT 5\n")
print(s.recv(65536).decode())
s.close()

Each connection handles one SQL query, returns a JSON response, then closes. Only one listener can run at a time (bound to the game process).