postgre-SQL

A PostgreSQL support for node.js, based on node-postgres and used Pool.

安装

npm i postgre-sql

配置

const {connect} = require('postgre-sql');
connect({user:'postgres',database:'test',max:2,idleTimeoutMillis:100});

使用DEMO

const {client} = require('postgre-sql');
let db = new client();
(async ()=>{
    try{
        let res = await db.table('public.users')
            .where({vip:true},"create_at>'2017-01-01' and coordinate <-> point(116,39) < 1")
            .field('uid,user_name').order('uid desc').page(2).select();
            // res -> [{uid:34,use_name:'alice'},{uid:35,user_name:'💘'}...]
    }catch (e){
        // something else
    }
    try{
        await db.begin();
        let new_uid = await db.table('public.users').add({user_name:'charles'});
        await db.commit();
    }catch (e){
        db.rollback();
    }
    
})();

会话模式

默认是statement模式，这个模式的语句会平均负载到池中所有的连接。适合并行查询！

会话模式会根据业务自动调整。

语句模式 statement

const {client} = require('postgre-sql');
let db = new client();
(async ()=>{
    try{
        let res = await db.table('public.users')
            .where({vip:true},"create_at>'2017-01-01' and coordinate <-> point(116,39) < 1")
            .field('uid,user_name').order('uid desc').page(2).select();
            // res -> [{uid:34,use_name:'alice'},{uid:35,user_name:'💘'}...]
    }catch (e){
        // something else
    }
})();

会话模式 session

const {client} = require('postgre-sql');
let db = new client();
(async ()=>{
    try{
        await db.connect();
        let res = await db.table('public.users')
            .where({vip:true},"create_at>'2017-01-01' and coordinate <-> point(116,39) < 1")
            .field('uid,user_name').order('uid desc').page(2).select();
            // res -> [{uid:34,use_name:'alice'},{uid:35,user_name:'💘'}...]
        await db.release(); // Attention! if connection a session don't forget release it!
    }catch (e){
        await db.release(); // Attention! if connection a session don't forget release it!
        // something else
    }
})();

事务模式 transaction

const {client} = require('postgre-sql');
let db = new client();
(async ()=>{
    try{
        await db.begin();
        let new_uid = await db.table('public.users').add({user_name:'charles'});
        await db.commit(); // Attention! if start a transaction don't forget finish it!
    }catch (e){
        db.rollback(); // Attention! if start a transaction don't forget finish it!
    }
    
})();

自动完成

如果表中有create_at、update_at、delete_at。在CUD的操作中会自动填充NOW()。

软删除只在db.table(tableName).where(conditions).delete();时影响结果。

在SELECT类型的语句中，不会主动识，别并剔除delete_at非空的记录。需要手动写在conditions中。