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express-server/db-config/keys.js

@@ -0,0 +1,9 @@
+module.exports ={
+    postgresSQL:{
+        user:"postgres",
+        host:"localhost",
+        database:"SmartShopperDB",
+        password:"postgres",
+        port:"5432"
+    }
+}

express-server/db-config/postgresql-common.js

@@ -0,0 +1,45 @@
+const { Client } = require ("pg");
+const {postgresSQL} = require("./keys")
+
+const client = new Client(postgresSQL);
+
+async function connect() {
+    try{
+    await client.connect();
+    console.log("connected!");
+    }
+    catch(error)
+    {
+        console.error(error)
+    }
+}
+connect();
+
+async function query(queryString,param)
+{
+    try {
+    let result = await client.query(queryString,param);
+    let resultarray = [];
+    for(let row of result.rows)
+    {
+        resultarray.push(row.obj);
+    }
+    return resultarray;
+    }
+    catch(error)
+    {
+        console.log(error)
+    }
+}
+
+async function nonQuery(queryString,param) {
+    try {
+        await client.query(queryString,param);
+    } catch (error) {
+        console.error(error)
+    }
+}
+
+module.exports = {
+    query, nonQuery
+}