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Add queriesRunner #48

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Add queriesRunner #48

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43 changes: 33 additions & 10 deletions src/queries.js
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Original file line number Diff line number Diff line change
@@ -1,5 +1,24 @@
const databaseConnection = require('./database/db_connection');

const queriesRunner = (queries, cb) => {
const query = queries.shift();
if (query) {
if (Array.isArray(query)) {
databaseConnection.query(query[0], query[1], (err, res) => {
if (err) throw err;
queriesRunner(queries, cb);
});
} else {
databaseConnection.query(query, (err, res) => {
if (err) throw err;
queriesRunner(queries, cb);
});
}
} else {
cb();
}
};

const createUser = (name) => {
databaseConnection.query(`INSERT INTO users(name) VALUES ('${name}');`, (err, res) => {
if (err) {
Expand Down Expand Up @@ -73,16 +92,20 @@ const getOwnership = (cb) => {

const buyItem = (user_name, item_name, cb) => {
item_name = decodeURI(item_name);
const dbQuery = `UPDATE users SET gold_pieces = gold_pieces - (SELECT item_price from inventory WHERE item_name = '${item_name}'), name = '${user_name}';
UPDATE inventory SET item_quantity = item_quantity - 1 WHERE item_name = '${item_name}';
INSERT INTO ownership(owner_id, item_id)
VALUES ((SELECT id FROM users WHERE name = '${user_name}' LIMIT 1), (SELECT id FROM inventory WHERE item_name = '${item_name}' LIMIT 1));`
databaseConnection.query(dbQuery, (err, res) => {
if (err) cb(err)
else {
cb(null)
}
})
const queries = [
"BEGIN;",
[ "UPDATE users SET gold_pieces = gold_pieces - (SELECT item_price from inventory WHERE item_name = $1), name = $2;",
[item_name, user_name]
],
[ "UPDATE inventory SET item_quantity = item_quantity - 1 WHERE item_name = $1;",
[item_name]
],
["INSERT INTO ownership(owner_id, item_id) VALUES ((SELECT id FROM users WHERE name = $1 LIMIT 1), (SELECT id FROM inventory WHERE item_name = $1 LIMIT 1));",
[user_name]
],
"COMMIT;"
];
queriesRunner(queries,cb);
}

// UPDATE users SET gold_pieces = gold_pieces - 1 WHERE name = {1};
Expand Down