Question

我正在尝试创建一个节点应用程序，该应用程序可以通过创建数据库，然后创建表和字段来在数据库端进行自我设置。以下是我用来彼此独立执行每个任务的两个函数。我可以在如何将它们结合在一起方面获得帮助吗？我应该使用pg-promise而不是pg吗？

function createDatabase(){

const pool = new pg.Pool({
    user: 'postgres',
    host: '127.0.0.1',
    database: 'postgres',
    password: 'postgres',
    port: '5432'}
);

pool.query("CREATE DATABASE myApp;", 
    (err, res) => {
    console.log(err, res);
    pool.end();

});
}


function createTable(){

const pool = new pg.Pool({
    user: 'postgres',
    host: '127.0.0.1',
    database: 'myApp',
    password: 'postgres',
    port: '5432'}
);

pool.query("CREATE TABLE session(sessionguid UUID NOT NULL, created 
text NOT NULL, sessionlife integer NOT NULL)", 
    (err, res) => {
    console.log(err, res);
    pool.end();
});

}

Answer 1

也许以下代码会为您提供帮助。现在，“ CREATE DATABASE”查询完成后，将立即在回调中创建表。

function createDatabase(){
const pool = new pg.Pool({
    user: 'postgres',
    host: '127.0.0.1',
    database: 'postgres',
    password: 'postgres',
    port: '5432'}
);

pool.query("CREATE DATABASE myApp;", (err, res) => {
    console.log(err, res);

    pool.query("CREATE TABLE session(sessionguid UUID NOT NULL, created text NOT NULL, sessionlife integer NOT NULL)", (err, res) => {
        console.log(err, res);
        pool.end();
    });
});
}

Answer 2

为了从代码创建数据库，我使用客户端而不是池。示例如下：

        const { Pool, Client } = require('pg')
        const client = new Client({
            user: 'postgres',
            host: 'localhost',
            password: 'postgres',
            port: 5432
        })
        await client.connect()
        await client.query(`DROP DATABASE IF EXISTS ${dbname};`)
        await client.query(`CREATE DATABASE ${dbname};`)
        await client.end()

        //call the pool you just created after the database has been created.

首先使用Node和pg创建数据库后如何创建表

2 个答案: