edu-textbook/server/db/pg-instance.js

const pgp = require('pg-promise')();

// 连接到数据库
var PgInstanse;
export const pgClient = function(){
    let pgConns = global.config['DATABASE_DBNAME']
    
    if(global.config['LOCAL']) {
        pgConns = `postgres://postgres:postgres@127.0.0.1:25432/postgres`
    }
    
    if(!PgInstanse){
        // console.log(pgconfig)
        PgInstanse = pgp(pgConns);
    }
    return PgInstanse;
}