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ali-h-mysql-ts

v1.3.17

Published

a lightweight mysql tools for nodejs

Downloads

8

Readme

项目简介 command+shift+b构建ts

NPM version npm download

为nodejs访问mysql数据库提供强大流畅的api的工具类库,目标是希望访问数据库逻辑都能使用一行代码完成,让访问数据库变得更加简单优雅。

使用说明

为nodejs访问mysql数据库提供强大流畅的api的工具类库,目标是希望访问数据库逻辑都能使用一行代码完成,让访问数据库变得更加简单优雅。

使用说明

1. 初始化配置

初始化如下

const DbClient = require('ali-mysql-client');

const db = new DbClient({
        // host
        host: '127.0.0.1',
        // 端口号
        port: '3306',
        // 用户名
        user: 'root',
        // 密码
        password: 'aa/AA123456',
        // 数据库名
        database: 'overload',
        charset: "utf8mb4",//制定字符集用于保存emoji
        dateStrings: true,
        timezone: "+08:00"
});

不同框架的使用示例:

2. 构造查询

  • 2.1 查询单个值
// 查询单个值,比如下面例子返回的是数字51,满足条件的数据条数
const result = await db
  .select("count(1)")
  .from("page")
  .where("name", "测试", "like")
  .value();
  • 2.2 查询单条数据
// 查询单条数据,返回的是 result = {id:12, name: '测试页面', ....}
const result = await db
  .select("*")
  .from("page")
  .where("id", 12) // id = 12
  .findOne();
  • 2.3 查询多条数据
// 查询多条数据 返回的是 ressult = [{...}, {...}];
const result = await db
  .select("*")
  .from("page")
  .where("name", "测试页面", 'like') // name like '%测试页面%'
  .find(); // find(rows:number) 可以传递数字指定行数,默认不做限制
  • 2.4 服务端分页查询
// 查询多条数据(服务端分页) 返回的是 ressult = {total: 100, rows:[{...}, {...}]};
const result = await db
  .select("*")
  .from("page")
  .where("id", 100, "lt") // id < 100
  .page(3, 20); //每页 20 条,取第 3 页
  • 2.5 多表关联查询
// 多表关联查询
const result = await db
  .select("a.page_id, a.saga_key")
  .from("page_edit_content as a")
  .join("left join page as b on b.id = a.page_id")
  .where("b.id", 172)
  .find();
  • 2.6 查询除了支持各种多表join外,当然还支持groupby orderby having等复杂查询操作
const result = await db
  .select("a1 as a, b1 as b, count(c) as count")
  .from("table")
  .where("date", db.literals.now, "lt") // date < now()
  .where("creator", "huisheng.lhs")  // creator = 'huisheng.lhs"
  .groupby("a1, b1")
  .having("count(category) > 10")
  .orderby("id desc")
  .page(2); //默认每页20条,取第2页
  • 2.7 转为sql自己处理
const result = await db
  .select('id')
  .from('page')
  .where('id', 100)
  .toSql();

expect(result).toBe('select id from page where `id` = 100');

3. 构造插入

const task = {
  action: "testA",
  description: "desc1",
  state: "123",
  result: "result1"
};

// 插入一条数据
const result = await db
  .insert("task", task)
  .execute();

// 也支持直接写字段,支持增加字段
const result = await db
  .insert("task")
  .column("action", "test")
  .column("create_time", db.literals.now)
  .execute();

// 插入多条数据
const tasks = [ task1, taks2, task3 ];
const result = await db
  .insert("task", tasks)
  .execute();

// 支持增加或覆盖字段
const result = await db
  .insert("task", tasks)
  .column('create_time', db.literals.now)  // 循环赋值给每一行数据
  .column('create_user', 'huisheng.lhs')
  .execute();

4. 构造更新

const task = {
  action: "testA",
  description: "desc1",
  state: "123",
  result: "updateResult"
};

//更新数据
const result = await db
  .update("task", task)
  .where("id", 1)
  .execute();

//数字递增
const result = await db
  .update("task")
  .inc("id", 1)
  .execute();

//数字递减
const result = await db
  .update("task")
  .dec("id", 1)
  .execute();

//更新数据,支持增加字段
const result = await db
  .update("task")
  .column("action", "test-id22")
  .column("create_time", db.literals.now)
  .where('id', 2)
  .execute();

// 字面量使用 db.literals.now 等价于 db.literal("now()")
const result = await db
  .update("task")
  .column("count", db.literal("count + 1"))
  .column("create_time", db.literal("now()"))
  .where('id', 2)
  .execute();

5. 构造删除

//删除id为1的数据
const result = await db
  .delete("task")
  .where("id", 1)
  .execute();

6. 自定义SQL

// 执行自定义SQL
const result = await db
  .sql('select id from page where `id` = ?')
  .params([ 100 ])
  .execute();

6. 事务控制

const trans = await db.useTransaction();

try {
  // 数据库操作
  // await trans.insert(...)
  // await trans.update(...)
  await trans.commit();
} catch (e) {
  await trans.rollback();
}

7. 复杂条件查询设计

7.1 查询条件所有参数说明

// 查询条件所有参数
const result = await db
  .where(field, value, operator, ignore, join) // 支持的所有参数
  .where({field, value, operator, ignore, join}) //支持对象参数
  .find();
  
// 复杂查询条件
const result = await db
  .select("*")
  .from("page")
  .where("id", 100, "gt") // id > 100
  .where("tags", "test", "like") //name like '%test%'
  .where("tech", tech, "eq", "ifHave") // tech='tech_value' 当 tech 为空时,不做为查询条件
  .where("tags", tags, "findinset", "ifHave", "or")
  .find();
  • field 字段名
  • value 传入值
  • operator 操作符,默认equal4
  • ignore 是否加为条件,返回false时则忽略该条件
  • join 连接符号(and or),默认为and

7.2 操作逻辑定义operator

该参数很好理解,默认值为equal,支持传字符串或传入函数,传入字符串则会匹配到已定义的逻辑,

const result = await db
  .select("*")
  .from("page");
  .where("id", 100, "lt")  // id < 100
  .where("group_code", "dacu") // group_code = "dacu"
  .find();

大家能理解operator是为拼接查询条件使用的逻辑封装,复杂条件的拓展能力都可以靠自定义的operator来完成。其函数的形式如下:

const customOperator =  ({ field, value }) => {
  if (condition) {
    return {
      sql: '?? = ?',
      arg: [ field, value ],
    };
  } else {
    return {
      sql: '?? > ?',
      arg: [ field, value ],
    };
   }
};

// 可直接使用也可注册到全局
const config = db.config();
config.registerOperator("customOperator", customOperator);

7.3 是否加为条件ignore

这个需要解释下,当满足xx条件时则忽略该查询条件,ignore设计的初衷是为了简化代码,比如以下代码是很常见的,界面上有输入值则查询,没有输入值时不做为查询条件:

const query = db
  .select("*")
  .from("page");
  .where("id", 100, "lt");

if (name){
    query.where("name", name, 'like');
}

if (isNumber(source_id)){
    query.where('source_id', source_id)
}

const result = await query.find();

上面的代码使用ignore时则可简化为:

const result = await db
  .select("*")
  .from("page")
  .where("id", 100, "lt")
  .where("name", name, "like", "ifHave") //使用内置 ifHave,如果name为非空值时才加为条件
  .where("source_id", tech, "eq", "ifNumber") //使用内置 ifNumber
  .find();

支持传字符串或传入函数,传入字符串则会匹配到已定义的逻辑,其函数的形式如下:

const customIgnore = ({field, value}) => {
    if (...){
        return false;
    }
    
    return true;
};

//也可以注册到全局使用
const config = db.config();
config.registerIgnore("customIgnore", customIgnore);

7.4 查询条件优先级支持

// where a = 1 and (b = 1 or c < 1) and d = 1
const result = await db.select('*')
  .from('table')
  .where('a', 1)
  .where([
    {field: 'b', value: '1', operator:'eq'},
    {field: 'c', value: '1', operator:'lt', join: 'or'},
  ])
  .where('d', 1)
  .find();

7.5 真实场景中的复杂查询示例

// 复杂查询,真实场景示例,项目中拓展了keyword、setinset等operator及ignore
const result = await app.db
  .select('a.*, b.id as fav_id, c.name as biz_name, d.group_name')
  .from('rocms_page as a')
  .join(`left join favorite as b on b.object_id = a.id and b.object_type = "rocms_page" and b.create_user = "${this.ctx.user.userid}"`)
  .join('left join rocms_biz as c on c.biz = a.biz')
  .join('left join rocms_biz_group as d on d.biz = a.biz and d.group_code = a.biz_group')
  // 关键字模糊查询
  .where('a.name,a.biz,a.biz_group,a.support_clients,a.owner,a.status', query.keywords, 'keywords', 'ifHasValueNotNumber') // 关键字在这些字段中模糊查询
  .where('a.id', query.keywords, 'eq', 'ifNumber') // 关键字中输入了数字时当作id查询
  // 精确查询
  .where('a.id', query.id, 'eq', 'ifHave')
  .where('a.name', query.name, 'like', 'ifHave')
  .where('a.biz', query.biz, 'eq', 'ifHave')
  .where('a.biz_group', query.biz_group, 'eq', 'ifHave')
  .where('a.support_clients', query.support_clients, 'setinset', 'ifHave')
  .where('a.status', query.status, 'insetfind', 'ifHave')
  .where('a.owner', query.owner, 'eq', 'ifHave')
  .where('a.owner,a.owner1', query.owner, 'or', 'ifHave') // (a.owner=query.owner or a.owner1=query.owner)
  .where('a.offline_time', query.owner, 'eq', 'ifHave')
  //时间格式化查询  key,format,symbol
  .where('a.date',"2022-02-02" 'date') // DATE_FORMAT(a.date,"%Y-%m-%d") = "2022-02-02"
  .where('a.date,%Y',"2022" 'date') // DATE_FORMAT(a.date,"%Y") = "2022"
  .where('a.date,%Y,>=',"2022" 'date') // DATE_FORMAT(a.date,"%Y") >= "2022"
  // TAB类型 我的页面own、我的收藏fav、所有页面all
  .where('a.owner', this.ctx.user.userid, 'eq', () => query.queryType === 'own')
  .where('b.id', 0, 'isnotnull', () => query.queryType === 'fav')
  // 分页查询
  .orderby('a.update_time desc, a.id desc')
  .page(query.pageIndex, query.pageSize);

8. 自定义配置

const config = db.config();

// 自定义operator
config.registerOperator('ne', ({ field, value }) => {
  return { sql: '?? <> ?', arg: [ field, value ] };
});

// 自定义ignore
config.registerIgnore('ifNumber', ({ value }) => {
  return !isNaN(Number(value));
});

// 监听事件 执行前
config.onBeforeExecute(function({ sql }) {
  console.log(sql);
});

// 监听事件 执行后
config.onAfterExecute(function({ sql, result }) {
  console.log(result);
});

// 监听事件 执行出错
config.onExecuteError(function({ sql, error }) {
  console.log(error);
});

9. 内置的operator及ignore

  • 内置的默认operator

    • eq (equal)
    • ne (not equal)
    • in (in)
    • gt (greater than)
    • ge (greater than or equal)
    • lt (less than)
    • le (less than or equal)
    • isnull (is null)
    • isnotnull (is not null)
    • like (like)
    • startwith (start with)
    • endwith (end with)
    • between (between)
    • findinset (find_in_set(value, field))
    • insetfind (find_in_set(field, value))
    • sql (custom sql)
    • keywords (keywords query)
    • not in
    • <,>= 等比较符号
    • <>
    • date (DATE_FORMAT(??,"%Y-%m-%d") = ?) ('key,format,symbol')=>('date,%Y,>=')
    • or (字段写法 "key1,key2")=>(key1 =1 or key2 =1)
    • or in (字段写法 "key1,key2")=>(key1 in (1) or key2 in (1))
  • 内置的默认ignore

    • ifHave (如果有值则加为条件 包括判断数组是否为空)
    • ifNumber (如果是数值则加为条件)

midwayjs配置 安装

yarn add egg-mysql ali-mysql-client

plugin.ts

mysql: {
    enable: true,
    package: 'egg-mysql',
}

配置 config.ts

export const mysql = {
  // 单数据库信息配置
  client: {
    // host
    host: '127.0.0.1',
    // 端口号
    port: '3306',
    // 用户名
    user: 'root',
    // 密码
    password: 'root',
    // 数据库名
    database: 'table',
  },
  // 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,
};

// @ali/mysql-client配置
export const mysqlClient = {
  config: config => {
    // 自定义operator
    config.registerOperator('ne', ({ field, value }) => {
      return { sql: '?? <> ?', arg: [field, value] };
    });

    // 自定义ignore
    config.registerIgnore('ifNumber', ({ value }) => {
      return !isNaN(Number(value));
    });

    // 监听事件 执行前
    config.onBeforeExecute(function ({ sql }) {
      console.log(sql);
    });

    // 监听事件 执行后
    config.onAfterExecute(function ({ sql, result }) {
      console.log(result);
    });

    // 监听事件 执行出错
    config.onExecuteError(function ({ sql, error }) {
      console.log(error);
    });
  },
};

configuration.ts

import { App, Configuration } from '@midwayjs/decorator';
import { ILifeCycle } from '@midwayjs/core';
import { Application } from 'egg';
import { join } from 'path';
const DbClient = require('ali-mysql-client');

@Configuration({
  importConfigs: [join(__dirname, './config')],
  conflictCheck: true,
})
export class ContainerLifeCycle implements ILifeCycle {
  @App()
  app: Application;

  async onReady() {
    const { mysql, mysqlClient } = this.app.config;

    if (mysql.clients) { // 如果支持多实例,则把app.db对象清空,挂在其子节点上
      this.app.db = {};
      Object.keys(mysql.clients).forEach(key => {
        this.app.db[key] = new DbClient({
          mysql: this.app.mysql.get(key),
          config: mysqlClient,
        });
      });
    } else { // 单实例的情况下直接挂在app对象上
      this.app.db = new DbClient({
        mysql: this.app.mysql,
        config: mysqlClient,
      });
    }
  };
}