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egg-postgres

v1.0.2

Published

PostgreSQL plugin for egg

Downloads

235

Readme

egg-postgres

PostgreSQL 插件是为 egg 提供 PostgreSQL 数据库访问的功能

此插件基于 node-postgres 实现一个简单的配置封装,具体使用方法你还需要阅读 node-postgres 的文档。

安装

$ npm i egg-postgres --save

配置

通过 config/plugin.js 配置启动 PostgreSQL 插件:

exports.postgres = {
  enable: true,
  package: 'egg-postgres',
};

config/config.${env}.js 配置各个环境的数据库连接信息:

单数据源

exports.postgres = {
  // 单数据库信息配置
  client: {
    // host
    host: 'pg.com',
    // 端口号
    port: '15432',
    // 用户名
    user: 'test_user',
    // 密码
    password: 'test_password',
    // 数据库名
    database: 'test',    
  },
  // 是否加载到 app 上,默认开启
  app: true,
  // 是否加载到 agent 上,默认关闭
  agent: false,
};

使用方式:

app.postgres.query(sql, values); // 单实例可以直接通过 app.postgres 访问

多数据源

exports.postgres = {
  clients: {
    // clientId, 获取client实例,需要通过 app.mysql.get('clientId') 获取
    db1: {
      // host
      host: 'pg.com',
      // 端口号
      port: '15432',
      // 用户名
      user: 'test_user',
      // 密码
      password: 'test_password',
      // 数据库名
      database: 'test',
    },
    // ...
  },
  // 所有数据库配置的默认值
  default: {
    // 连接池最大数量
    max: 20,
    // 查询超时
    idleTimeoutMillis: 30000,
    // 连接超时
    connectionTimeoutMillis: 2000,
  },

  // 是否加载到 app 上,默认开启
  app: true,
  // 是否加载到 agent 上,默认关闭
  agent: false,
};

使用方式:

const client1 = app.postgres.get('db1');
client1.query(sql, values);

const client2 = app.postgres.get('db2');
client2.query(sql, values);

扩展

app.js

app.postgres

如果开启了 config.postgres.app = true,则会在 app 上注入 node-postgres 客户端 的 Singleton 单例

app.postgres.query(sql);
app.postgres.get('db1').query(sql);

agent.js

agent.postgres

如果开启了 config.postgres.agent = true,则会在 agent 上注入 node-postgres 客户端 的 Singleton 单例

agent.postgres.query(sql);
agent.postgres.get('db1').query(sql);

CRUD 使用指南

Create

// 插入
const result = await app.postgres.query('insert into t_user(name,age) values ($1,$2)',['张三',13]);
//计算数据库受影响记录
const insertSuccess = result.rowCount === 1;

Read

const {rows} = await app.postgres.query('select * from t_user where age=$1', [13]);

Update

const result= await app.postgres.query('update t_user set age=$1 where name=$2', [15,'张三']);
//计算数据库受影响记录
const updateSuccess = result.rowCount === 1;

Delete

const result= await app.postgres.query('delete from t_user');
//计算数据库受影响记录
const deleteSuccess = result.rowCount === 1;

License

MIT