first version

bot/src/main/kotlin/dev/inmo/plagubot/config/DatabaseConfig.kt

@@ -0,0 +1,40 @@
+package dev.inmo.plagubot.config
+
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.Transient
+import org.jetbrains.exposed.sql.Database
+import org.jetbrains.exposed.sql.transactions.transactionManager
+import org.sqlite.JDBC
+import java.sql.Connection
+
+@Serializable
+data class DatabaseConfig(
+    val url: String = "jdbc:sqlite:file:test?mode=memory&cache=shared",
+    val driver: String = JDBC::class.qualifiedName!!,
+    val username: String = "",
+    val password: String = "",
+    val initAutomatically: Boolean = true
+) {
+    @Transient
+    private lateinit var _database: Database
+    val database: Database
+        get() = try {
+            _database
+        } catch (e: UninitializedPropertyAccessException) {
+            Database.connect(
+                url,
+                driver,
+                username,
+                password
+            ).also {
+                _database = it
+                it.transactionManager.defaultIsolationLevel = Connection.TRANSACTION_SERIALIZABLE // Or Connection.TRANSACTION_READ_UNCOMMITTED
+            }
+        }
+
+    init {
+        if (initAutomatically) {
+            database // init database
+        }
+    }
+}