Import other modules into monorepo

src/orm/connection/Connection.ts

@@ -0,0 +1,65 @@
+import {Collection, ErrorWithContext} from "../../util";
+import {QueryResult} from "../types";
+import {SQLDialect} from "../dialect/SQLDialect";
+import {AppClass} from "../../lifecycle/AppClass";
+
+/**
+ * Error thrown when a connection is used before it is ready.
+ * @extends Error
+ */
+export class ConnectionNotReadyError extends ErrorWithContext {
+    constructor(name = '', context: {[key: string]: any} = {}) {
+        super(`The connection ${name} is not ready and cannot execute queries.`)
+        this.context = context
+    }
+}
+
+/**
+ * Abstract base class for database connections.
+ * @abstract
+ */
+export abstract class Connection extends AppClass {
+
+    constructor(
+        /**
+         * The name of this connection
+         * @type string
+         */
+        public readonly name: string,
+        /**
+         * This connection's config object
+         */
+        public readonly config: any = {},
+    ) { super() }
+
+    public abstract dialect(): SQLDialect
+
+    /**
+     * Open the connection.
+     * @return Promise<void>
+     */
+    public abstract init(): Promise<void>
+
+    /**
+     * Execute an SQL query and get the result.
+     * @param {string} query
+     * @return Promise<QueryResult>
+     */
+    public abstract query(query: string): Promise<QueryResult>
+
+    /**
+     * Close the connection.
+     * @return Promise<void>
+     */
+    public abstract close(): Promise<void>
+
+    // public abstract databases(): Promise<Collection<Database>>
+
+    // public abstract database(name: string): Promise<Database | undefined>
+
+    // public abstract database_as_schema(name: string): Promise<Database>
+
+    // public abstract tables(database_name: string): Promise<Collection<Table>>
+
+    // public abstract table(database_name: string, table_name: string): Promise<Table | undefined>
+}