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41 lines
1.6 KiB
JavaScript
41 lines
1.6 KiB
JavaScript
// Adapted from the documentation of https://github.com/brianc/node-postgres,
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// which is licensed under the MIT license; see file node-postgres-LICENSE.
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const pg = require('pg');
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// create a config to configure both pooling behavior
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// and client options
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// note: all config is optional and the environment variables
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// will be read if the config is not present
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var config = {
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user: 'foo', //env var: PGUSER
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database: 'my_db', //env var: PGDATABASE
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password: 'secret', //env var: PGPASSWORD
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host: 'localhost', // Server hosting the postgres database
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port: 5432, //env var: PGPORT
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max: 10, // max number of clients in the pool
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idleTimeoutMillis: 30000, // how long a client is allowed to remain idle before being closed
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};
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//this initializes a connection pool
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//it will keep idle connections open for 30 seconds
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//and set a limit of maximum 10 idle clients
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const pool = new pg.Pool(config);
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pool.on('error', function (err, client) {
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// if an error is encountered by a client while it sits idle in the pool
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// the pool itself will emit an error event with both the error and
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// the client which emitted the original error
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// this is a rare occurrence but can happen if there is a network partition
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// between your application and the database, the database restarts, etc.
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// and so you might want to handle it and at least log it out
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console.error('idle client error', err.message, err.stack);
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});
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//export the query method for passing queries to the pool
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module.exports.query = function (text, values, callback) {
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console.log('query:', text, values);
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return pool.query(text, values, callback);
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};
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module.exports.pool = pool;
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