Added toSQLParameters

Author: blendsdk

src/index.ts

@@ -3,4 +3,5 @@ export * from "./executeQuery";
 export * from "./query";
 export * from "./insert";
 export * from "./update";
-export * from "./delete";
+export * from "./delete";
+export * from "./utils";

src/tests/sql_query.spec.ts

@@ -2,6 +2,7 @@ import { close } from "fs";
 import { closeConnection, createConnection } from "../connection";
 import { executeQuery, IDynamicQuery } from "../executeQuery";
 import { sql_query } from "../query";
+import { toSQLParameters } from "../utils";
 
 test("sql_query", async () => {
     const connection = createConnection({
@@ -41,7 +42,7 @@ test("sql_query dynamic", async () => {
         (params: InputType): IDynamicQuery => {
             return {
                 named: false,
-                sql: `select * from pg_class where oid in (${params.oids.map((a, i) => { return "$" + (i + 1) }).join(",")})`,
+                sql: `select * from pg_class where oid in (${toSQLParameters<string>(params.oids)})`,
                 parameters: params.oids
             }
         }

src/utils.ts

@@ -0,0 +1,20 @@
+import { wrapInArray } from "@blendsdk/stdlib/dist/wrapInArray";
+import { isNullOrUndefDefault } from "@blendsdk/stdlib/dist/isNullOrUndef";
+
+/**
+ * Creates a numbered parameter based the provided argument
+ * to be used in an SQL query. This function is mainly used
+ * from the IN(....) caluse.
+ *
+ * @export
+ * @template ReturnType
+ * @param {(any | any[])} args
+ * @param {boolean} [asArray]
+ * @returns {ReturnType}
+ */
+export function toSQLParameters<ReturnType extends string | string[]>(args: any | any[], asArray?: boolean): ReturnType {
+    const tArgs = wrapInArray(args),
+        aArgs = tArgs.map((a, i) => { return "$" + (i + 1); });
+    asArray = isNullOrUndefDefault<boolean>(asArray, false);
+    return asArray ? aArgs : aArgs.join(", ") as any;
+}