chore(monorepo/server): move server-side source code

apps/server/src/share/sql.ts

@@ -0,0 +1,39 @@
+"use strict";
+
+import Database from "better-sqlite3";
+import dataDir from "../services/data_dir.js";
+import sql_init from "../services/sql_init.js";
+
+let dbConnection!: Database.Database;
+
+sql_init.dbReady.then(() => {
+    dbConnection = new Database(dataDir.DOCUMENT_PATH, { readonly: true });
+
+    [`exit`, `SIGINT`, `SIGUSR1`, `SIGUSR2`, `SIGTERM`].forEach((eventType) => {
+        process.on(eventType, () => {
+            if (dbConnection) {
+                // closing connection is especially important to fold -wal file into the main DB file
+                // (see https://sqlite.org/tempfiles.html for details)
+                dbConnection.close();
+            }
+        });
+    });
+});
+
+function getRawRows<T>(query: string, params = []): T[] {
+    return dbConnection.prepare(query).raw().all(params) as T[];
+}
+
+function getRow<T>(query: string, params: string[] = []): T {
+    return dbConnection.prepare(query).get(params) as T;
+}
+
+function getColumn<T>(query: string, params: string[] = []): T[] {
+    return dbConnection.prepare(query).pluck().all(params) as T[];
+}
+
+export default {
+    getRawRows,
+    getRow,
+    getColumn
+};