Fix _create for oracledb client (#221)

The _create  method was throwing an error because oracledb insert was returning the counting of changed rows instead of an array with row inserted rows id. The fix consists in adding a clause to set the "returning" parameter of insert to ["id"].

lib/index.js

@@ -236,18 +236,22 @@ class Service extends AdapterService {
     }).catch(errorHandler);
   }
 
-  _create (data, params = {}) {
+  _create(data, params = {}) {
     if (Array.isArray(data)) {
       return Promise.all(data.map(current => this._create(current, params)));
     }
 
-    const returning = this.db(params).client.config.client === 'pg' ? [this.id] : [];
+    const client = this.db(params).client.config.client;
+    const returning = client === "pg" || client === "oracledb" ? [this.id] : [];
 
-    return this.db(params).insert(data, returning).then(rows => {
-      const id = data[this.id] !== undefined ? data[this.id] : rows[0];
+    return this.db(params)
+      .insert(data, returning)
+      .then(rows => {
+        const id = data[this.id] !== undefined ? data[this.id] : rows[0];
 
-      return this._get(id, params);
-    }).catch(errorHandler);
+        return this._get(id, params);
+      })
+      .catch(errorHandler);
   }
 
   _patch (id, raw, params = {}) {