add cli tool

media-store/.vscode/launch.json

@@ -4,12 +4,19 @@
   // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
   "version": "0.2.0",
   "configurations": [
+    {
+      "name": "Launch Program",
+      "command": "npm run import:data",
+      "request": "launch",
+      "skipFiles": ["<node_internals>/**"],
+      "type": "node-terminal"
+    },
     {
       "command": "cds run --with-mocks --in-memory?",
       "name": "cds run",
       "request": "launch",
       "type": "node-terminal",
-      "skipFiles": [ "<node_internals>/**" ]
+      "skipFiles": ["<node_internals>/**"]
     }
   ]
 }

media-store/db/schema.cds

@@ -6,8 +6,9 @@ aspect NamedEntityAspect {
 }
 
 aspect ContactInfoAspect {
-    firstName  : String(40);
+    key ID     : Integer;
     lastName   : String(20);
+    firstName  : String(40);
     city       : String(40);
     state      : String(40);
     adress     : String(70);
@@ -35,18 +36,51 @@ entity Albums {
         artist : Association to Artists;
 }
 
-entity Employees : ContactInfoAspect {
-    key ID        : Integer;
-        reportsTo : Association to Employees;
-        title     : String(20);
-        birthDate : DateTime;
-        hireDate  : DateTime;
+// entity Employees : ContactInfoAspect {
+//     reportsTo : Association to Employees;
+//     title     : String(20);
+//     birthDate : DateTime;
+//     hireDate  : DateTime;
+// }
+
+// entity Customers : ContactInfoAspect {
+//     company    : String(80);
+//     supportRep : Association to Employees;
+// }
+
+// keep columns order for importing data
+entity Employees {
+    key ID         : Integer;
+        lastName   : String(20);
+        firstName  : String(40);
+        title      : String(20);
+        reportsTo  : Association to Employees;
+        birthDate  : DateTime;
+        hireDate   : DateTime;
+        adress     : String(70);
+        city       : String(40);
+        state      : String(40);
+        country    : String(40);
+        postalCode : String(10);
+        phone      : String(24);
+        fax        : String(24);
+        email      : String(60);
 }
 
-entity Customers : ContactInfoAspect {
-    key ID           : Integer;
-        company      : String(80);
-        supportRepId : Association to Employees;
+entity Customers {
+    key ID         : Integer;
+        firstName  : String(40);
+        lastName   : String(20);
+        company    : String(80);
+        adress     : String(70);
+        city       : String(40);
+        state      : String(40);
+        country    : String(40);
+        postalCode : String(10);
+        phone      : String(24);
+        fax        : String(24);
+        email      : String(60);
+        supportRep : Association to Employees;
 }
 
 entity Invoices {

media-store/package.json

@@ -13,7 +13,8 @@
     "sqlite3": "^5"
   },
   "scripts": {
-    "start": "npx cds run"
+    "start": "npx cds run",
+    "import:data": "node ./util/importData.js sqlite:chinook.db sqlite:mychinook.db ./db/schema.cds"
   },
   "cds": {
     "requires": {

media-store/srv/media-service.cds

@@ -1,5 +1,15 @@
-using {sap.capire.media.store as my} from '../db/schema';
+using { sap.capire.media.store as my } from '../db/schema';
 
 service MediaService {
     entity Employees as projection on my.Employees;
+    entity Customers as projection on my.Customers;
+    entity Albums        as projection on my.Albums;
+    entity Artists       as projection on my.Artists;
+    entity Genres        as projection on my.Genres;
+    entity InvoiceItems  as projection on my.InvoiceItems;
+    entity Invoices      as projection on my.Invoices;
+    entity MediaTypes    as projection on my.MediaTypes;
+    entity PlaylistTrack as projection on my.PlaylistTrack;
+    entity Playlists     as projection on my.Playlists;
+    entity Tracks        as projection on my.Tracks;
 }

media-store/util/importData.js

@@ -0,0 +1,70 @@
+const cds = require("@sap/cds");
+
+const FIRST_INDEX = 0;
+const SECOND_INDEX = 1;
+const SKIP_CLI_ARGS_NUMBER = 2;
+const THIRD_INDEX = 3;
+
+const toValues = (object) => Object.values(object);
+
+const camelCaseToSnake = (str) =>
+  str.replace(
+    /[a-z][A-Z]/g,
+    (letters) =>
+      `${letters[FIRST_INDEX].toLowerCase()}_${letters[
+        SECOND_INDEX
+      ].toLowerCase()}`
+  );
+
+const elementsToColumns = (elements) => {
+  return Object.values(elements).map((element) =>
+    element.target ? `${element.name}_ID` : element.name
+  );
+};
+
+const constructInsertQuery = (targetEntityName, columns) => {
+  return (data) => INSERT.into(targetEntityName).columns(columns).rows(data);
+};
+
+(async () => {
+  const args = process.argv.slice(SKIP_CLI_ARGS_NUMBER);
+  const SRC_STORAGE_NAME = args[FIRST_INDEX];
+  const TARGET_STORAGE_NAME = args[SECOND_INDEX];
+  const TARGET_SCHEMA_PATH = args[THIRD_INDEX];
+  console.log(
+    "[LOG]: Import data from",
+    SRC_STORAGE_NAME,
+    "to",
+    TARGET_STORAGE_NAME
+  );
+
+  try {
+    const srcStorage = await cds.connect.to(SRC_STORAGE_NAME);
+    const targetStorage = await cds.connect.to(TARGET_STORAGE_NAME);
+
+    const eList = targetStorage.entities;
+
+    const targetCSNModel = await cds.load(TARGET_SCHEMA_PATH);
+    const reflectedCSNModel = cds.reflect(targetCSNModel);
+    const targetCSNEntities = Object.values(reflectedCSNModel.entities);
+
+    for (index in targetCSNEntities) {
+      const { name: targetEntityName, elements } = targetCSNEntities[index];
+      const targetColumns = elementsToColumns(elements);
+      const insertQuery = constructInsertQuery(targetEntityName, targetColumns);
+
+      const srcEntityName = camelCaseToSnake(targetEntityName.split(".").pop());
+      const srcResultRows = (await srcStorage.read(srcEntityName)).map(
+        toValues
+      );
+
+      console.log("[LOG]: From", srcEntityName, "to", targetEntityName);
+
+      const transaction = await targetStorage.tx();
+      await transaction.run(srcResultRows.map(insertQuery));
+      await transaction.commit();
+    }
+  } catch (errors) {
+    console.error(errors);
+  }
+})();