Add caching possibility to raw queries too

src/datasources/BaseSQLDataSource.ts

@@ -0,0 +1,32 @@
+import { SQLDataSource } from 'datasource-sql';
+const { InMemoryLRUCache } = require('apollo-server-caching');
+import crypto from 'crypto';
+
+export class BaseSQLDataSource extends SQLDataSource {
+  cache: any;
+  constructor(config) {
+    super(config);
+    this.cache = config.cache || new InMemoryLRUCache();
+  }
+
+  async cacheQuery(ttl = 5, query) {
+    const cacheKey = crypto
+      .createHash('sha1')
+      .update(query.toString())
+      .digest('base64');
+
+    return this.cache.get(cacheKey).then((entry) => {
+      if (entry) {
+        return Promise.resolve(JSON.parse(entry));
+      }
+
+      return query.then((rows) => {
+        if (rows) {
+          this.cache.set(cacheKey, JSON.stringify(rows), { ttl });
+        }
+
+        return Promise.resolve(rows);
+      });
+    });
+  }
+}