feat: add multi schema feature (#44)

support schema other than "public"

Co-authored-by: David Sooter <david.sooter@ext.sys.aok.de>

README.md

@@ -72,7 +72,8 @@ For local development you can provide the credentials in the file `default-env.j
           "port": "5432",
           "database": "dbname",
           "user": "postgres",
-          "password": "postgres"
+          "password": "postgres",
+          "schema":"public"
         }
       }
     ]

lib/pg/Service.js

@@ -38,6 +38,11 @@ module.exports = class PostgresDatabase extends cds.DatabaseService {
     }
     this._pool = new Pool(this.options.credentials)
 
+    // SET SCHEMA
+    if (this.options.credentials && this.options.credentials.schema) {
+      this._pool.query(`SET search_path TO '${this.options.credentials.schema}';`)
+    }
+
     // Mapping of the pg specific executions. Inspired by the SQLite and HANA adapters.
     // We call the default run handlers but pass in our custom execution functions.
     this._execute = execute