node-mysql-promise 基于 Node.js 异步操作 MySQL 数据库组件


Node.js 连接 MySQL 数据库,刚开始是直接使用一个名为 mysql 的库,但是他每次返回的都是一个数据库连接对象,而查询操作这些都是异步执行的,如果自己封装 Promise 对象势必会多写很多代码,node-mysql-promise 就很好的满足了这个需求。

npm 地址:https://www.npmjs.com/package/node-mysql-promise

Install

$ npm install node-mysql-promise

Introduction

node mysql 操作封装类,基于 promise,借鉴 75team 开源项目thinkjs中model操作,数据库连接使用node-mysql的连接池。

使用示例

var Mysql = require('node-mysql-promise');
var mysql = Mysql.createConnection({
    host        : 'localhost',
    user        : 'username',
    password    : 'password'
});
//SELECT * FROM table;
mysql.table('table').select().then(function (data) {
    console.log(data);
}).catch(function (e) {
    console.log(e);
});

API

配置

  • host: 连接的host(默认: localhost)
  • port: 连接端口
  • user: 用户名
  • password: 密码
  • database: 数据库名
  • tablePrefix: 数据表前缀
  • charset: 编码(默认: UTF8_GENERAL_CI)
  • timezone: 时区(默认: ‘local’)
  • connectTimeout: 连接超时时间(默认: 10000)
  • connectionLimit: 最大连接数(默认: 10)
  • logSql: 控制台输出sql(默认: false)

方法

table(tableName)

设置要查询的表(必需)

  • tableName String 要查询的表
  • return this
//SELECT * FROM `table`
mysql.table('table').select()

field(field, reverse)

设置要查询的字段

  • field String|Array 要查询的字段,可以是字符串,也可以是数组
  • reverse Boolean 是否反选字段
  • return this
//SELECT * FROM `table`
mysql.table('table').field().select();
//SELECT `id`, `title` FROM `table`
mysql.table('table').field('id, title').select();
//SELECT `id`, `title` FROM `table`
mysql.table(['id', 'title']).select();
//SELECT `author`, `date` FROM `table`
mysql.table('table').field(['id', 'title'], true).select();

limit(offset, length)

设置查询的数量

  • offset Number 起始位置
  • length Number 查询的数目
  • return this
//SELECT * FROM `table` LIMIT 10
mysql.table('table').limit(10).select();
//SELECT * FROM `table` LIMIT 10, 20
mysql.table('table').limit(10, 20).select();

page(page, listRows)

设置当前查询的页数,页数从1开始

  • page Number 当前的页数
  • listRows Number 一页记录条数,默认20条
  • return this
//SELECT * FROM `table`
mysql.table('table').page().select();
//SELECT * FROM `table` LIMIT 0,20
mysql.table('table').page(1).select();
//SELECT * FROM `table` LIMIT 10, 20
mysql.table('table').page(2, 10).select();

union(union, all)

联合查询

  • union String 联合查询的字符串
  • all 是否为UNION ALL模式
  • return this
//SELECT * FROM `table` UNION (SELECT * FROM `table2`)
mysql.table('table').union('SELECT * FROM `table2`').select();
//SELECT * FROM `table` UNION ALL (SELECT * FROM `table2`)
mysql.table('table').union('SELECT * FROM `table2`', true).select();
//SELECT * FROM `table` UNION ALL (SELECT * FROM `table2`)
mysql.table('table').union({table: 'table2'}, true);
//SELECT * FROM `table` UNION ALL (SELECT * FROM `table2`) UNION (SELECT * FROM `table3`)
mysql.table('table').UNION({table: 'table2`}, true).union({table: 'table3'});

join(join)

组合查询

  • join String|Array|Object
  • return this
//SELECT * FROM `table` LEFT JOIN `table2` ON table.id = table2.id
mysql.table('table').join('table2 on table.id = table2.id').select();
//SELECT * FROM `table` LEFT JOIN `table2` ON table.id = table2.id RIGHT JOIN `table3` ON table.sid = table3.sid
mysql.table('table').join('table2 ON table.id = table2.id', 'RIGHT JOIN table3 ON table.sid = table3.sid').select();
//SELECT * FROM `table` INNER JOIN `table2` on table.id = table2.id
mysql.table('table').join({
    table: 'table2',
    join: 'inner',//left, right, inner三种方式
    as: 'c' //表别名
    on: ['id', 'id'] //ON 条件
}).select();
//SELECT * FROM `table` AS a LEFT JOIN `table2` AS b ON a.id = b.id LEFT JOIN `table3` AS c ON a.sid = c.sid
mysql.table('table').alias('a').join({
    table: 'table2',
    join: 'left',
    as: 'b'
    on: ['id', 'id']
}).join({
    table: 'table3',
    join: 'left',
    as: 'c',
    on: ['sid', 'sid']
}).select(); 
//SELECT * FROM `table` AS a LEFT JOIN `table2` AS b ON a.id = b.id LEFT JOIN `table3` AS c ON a.sid = c.sid
mysql.table('table').join({
    table2: {
        join: 'left',
        as: 'b',
        on: ['id', 'id']
    },
    table3: {
        join: 'left',
        as: 'c',
        on: ['sid', 'sid']
    }
}).select(); 
//SELECT * FROM `table` LEFT JOIN `table2` ON table.id = table2.id LEFT JOIN `table3` ON (table.sid = table3.sid AND table.name = table3.title);
mysql.table('table').join({
    table2: {
        on: ['id', 'id']
    },
    table3: {
        on: {
            id: 'id',
            title: 'name'
        }
    }
}).select();

order(order)

设置排序方式

  • order String|Array|Obeject 排序方式
  • return this
//SELECT * FROM `table` ORDER BY `id`
mysql.table('table').order('id').select(); 
//SELECT * FROM `table` ORDER BY `id` DESC
mysql.table('table').order('id DESC').select();
//SELECT * FROM `table` ORDER BY `id` DESC, `title` ASC
mysql.table('table').order('id DESC, title ASC').select();
//SELECT * FROM `table` ORDER BY `id` DESC, `title` ASC
mysql.table('table').order(['id DESC', 'title ASC']).select();
//SELECT * FROM `table` ORDER BY `id` DESC `title` ASC
mysql.table('table').order({id: 'DESC', title: 'ASC'}).select();

alias(alias)

设置表别名

  • alias String 表别名
  • return this
//SELECT * FROM `table` AS t
mysql.table('table').alias('t').select();

having(str)

having查询

  • str String having查询的字符串
  • return this
//SELECT * FROM `table` HAVING `id` > 1 AND `id` < 100
mysql.table('table').having('id > 1 AND id < 100').select();

group(field)

分组查询

  • field String 设定分组查询的字段
  • return this
//SELECT * FROM `table` GROUP BY `date`
mysql.table('table').group('date').select();

distinct(field)

去重查询

  • field String 去重的字段
  • return this
//SELECT DISTINCT `title` FROM `table`
mysql.table('table').distinct('title').select();

where(where)

设置where条件

  • where Sting|Object 查询条件
  • return this
普通条件
//SELECT * FROM `table` WHERE `id` = 100;
mysql.table('table').where('id = 100').select();
//SELECT * FROM `table` WHERE `id` = 100;
mysql.table('table').where({id: 100}).select();
//SELECT * FROM `table` WHERE `id` = 100 OR `id` < 2
mysql.table('table').where('id = 100 OR id < 2').select();
//SELECT * FROM `table` WHERE `id` != 100
mysql.table('table').where({id: ['!=', 100]})
EXP条件

默认会对字段和值进行转义,如果不希望被转义,可是使用EXP的方式

//SELECT * FROM `table` WHERE `name` = 'name'
mysql.table('table').where({name: ['EXP', "='name'"]}).select();
//UPDATE `table` SET `num' = `num`+1
mysql.table('table').update({num: ['EXP', 'num+1']});
LIKE条件
//SELECT * FROM `table` WHERE (`title` NOT LIKE 'title')
mysql.table('table').where({title: ['NOT LIKE', 'title']}).select();
//SELECT * FROM `table` WHERE (`title` LIKE '%title%')
mysql.table('table').where({title: ['LIKE', '%title%']}).select();
//LIKE多个值
//SELECT * FROM `table` WHERE (`title` LIKE 'title' OR `title` LIKE 'name')
mysql.table('table').where({title: ['LIKE', ['title', 'name']]}).select();
//多个字段LIKE同一个值,OR的关系
//SELECT * FROM `table` WHERE ((`title` LIKE '%title%') OR (`content` LIKE '%title%'))
mysql.table('table').where({'title|content': ['LIKE', '%title%']}).select();
//多个字段LIKE同一个值,AND的关系
//SELECT * FROM `table` WHERE ((`title` LIKE '%title%') AND (`content` LIKE '%title%'))
mysql.table('table').where({'title&content': ['LIKE', '%title%']}).select();
IN条件
//SELECT * FROM `table` WHERE (`id` IN (1,2,3))
mysql.table('table').where({id: ['IN', '1, 2, 3']}).select();
//SELECT * FROM `table` WHERE (`id` IN (1, 2, 3))
mysql.table('table').where({id: ['IN', [1, 2, 3]]}).select();
//SELECT * FROM `table` WHERE (`id` NOT IN (1, 2, 3))
mysql.table('table').where({id: ['NOT IN', [1, 2, 3]]}).select();
多字段查询
//SELECT * FROM `table` WHERE (`id` = 10) AND (`title` = 'title')
mysql.table('table').where({id: 10, title: 'title'}).select();
//OR
//SELECT * FROM `table` WHERE (`id` = 10) OR (`title` = 'title')
mysql.table('table').where({id: 10, title: 'title', _logic: 'OR'}).select();
//XOR
//SELECT * FROM `table` WHERE (`id` = 10) XOR (`title` = 'title')
mysql.table('table').where({id: 10, title: 'title', _logic: 'XOR'}).select();
BETWEEN
//SELECT * FROM `table` WHERE (`id` BETWEEN 1 AND 2)
mysql.table('table').where({id: ['BETWEEN', 1, 2]}).select();
//SELECT * FROM `table` WHERE (`id` BETWEEN 1 AND 2)
mysql.table('table').where({id: ['BETWEEN', '1,2']}).select();
复合查询
//SELECT * FROM `table` WHERE `id` > 10 AND `id` < 20
mysql.table('table').where({id: {
    '>': 10,
    '<': 20
}}).select();
//SELECT * FROM `table` WHERE `id` < 10 OR `id` > 20
mysql.table('table').where({id: {
    '<': 10,
    '>': 20,
    _logic: 'OR'
}}).select();
//SELECT * FROM `table` WHERE (`id` > 10 AND `id` < 20) OR (`title` LIKE '%title%')
mysql.table('table').where({id: {
    '>': 10,
    '<': 20
}, title: ['LIKE', '%title%']}).select();
//SELECT * FROM `table` WHERE (`title` = 'title') AND ((`id` IN (1, 2, 3)) OR (`content` = 'content'))
mysql.table('table').where({
    title: 'title',
    _complex: {
        id: ['IN', [1, 2, 3]],
        content: 'content',
        _logic: 'OR'
    }
}).select();

count(field)

查询符合条件的数目

  • field String count的字段
  • return promise
//SELECT COUNT(`id`) FROM `table` LIMIT 1
mysql.table('table').count('id').then(function (count) {
    //count为符合条件的数目 
})

sum(field)

求和

  • field String 要求和的字段
  • return promise
//SELECT SUM(`num`) FROM `table` LIMIT 1
mysql.table('table').sum('num').then(function (sum) {
    //sum为求和的值 
});

max(field)

求字段的最大值

  • field String 要求最大值的字段
  • return promise
//SELECT MAX(`num`) FROM `table` LIMIT 1
mysql.table('table').max('num').then(function (max) { //max为num的最大值
});

min(field)

求字段的最小值

  • field String 要求最小值的字段
  • return promise
//SELECT MIN(`num`) FROM `table` LIMIT 1
mysql.table('table').min('num').then(function (min) {
    //min为num的最小值 
})

avg(field)

求字段的平均值

  • field Sting 要求平均值的字段
  • return promise
//SELECT AVG(`num`) FROM `table` LIMIT 1;
mysql.table('table').avg('num').then(function (avg) {
    //avg为num的平均值 
})

add(data)

插入数据

  • data Object 要插入的数据
  • return promise
var data  = {
    title: 'title',
    content: 'content'
};
mysql.table('table').add(data).then(function (insertId) {
    //如果插入成功,返回插入的id
    }).catch(function (err) {
        //插入失败,err为具体的错误信息
    })

thenAdd(data, where, returnDetail)

当数据表中不存在where条件对应的数据时才进行插入

  • data Object 要插入的数据
  • where String|Array|Object 检测的条件
  • returnDetail Boolean 是否返回详细的信息
//假设字段title为UNIQUE
var data = {
    title: 'title',
    content: 'content'
};
var where = {
    title: 'title'
}
mysql.table('table').thenAdd(data, where).then(function (id) {
    //返回已经存在或者刚插入的id
}) 
//返回详细信息
mysql.table('table').thenAdd(data, where, true).then(function (data) {
    /*
    data数据结构为
    {
        type: 'exist' || 'add',  //exist表示已存在,add新增
        id: 1
    }
    */ 
})

addAll(data)

一次添加多条数据

  • data Array
  • return promise
var data = [{title: 'xxx'}, {title: 'yyy'}];
mysql.table('table').addAll(data).then(function (insertId) {
    //插入成功
}).catch(function (err) {
    //插入失败
})

delete()

删除数据

  • return promise
//删除所有数据
mysql.table('table').delete().then(function (affectRows) {
    //返回影响行数
}) 
//删除符合条件的数据
mysql.table('table').where(where).delete().then(functino (affectRows) {
    //返回影响的行数
})

update(data)

更新数据,需要条件

  • data Object 要更新的数据
  • return promise
mysql.table('table').where(where).update(data).then(function (affectRows) {
    //返回影响行数
})

select()

查询符合条件的数据

  • return promise
mysql.table('table').where(where).select().then(function (data) {
    //返回结果 Array
})

find()

查找一条符合条件的数据

  • return promise
mysql.table('table').where(where).find().then(function (data) {
    //返回结果 Object
})

updateInc(field, step)

字段值增加

  • field String 要增加的字段
  • step Number 增加的数值,默认为1
  • return promise
//将id为1的num字段加10
mysql.table('table').where({id: 1}).updateInc('num', 10).then(function () {
})

updateDec(field, step)

字段值减少

  • field String 要减少的字段
  • step Number 减少的数字,默认为1
  • return promise
//将id为1的num字段值减10
mysql.table('table').where({id: 1}).updateDec('num', 10).then(function () {
})

getField(field, onlyOne)

获取某个字段的值

  • field String 要获取的字段,可以是多个字段(用,隔开)
  • onlyOne Boolean|Array 是否只需要一个值,或者是需要几个值
//取id>100的id集合
mysql.table('table').where({id: ['>', 100]}).getField('id').then(function (data) {
    //data为Array,是符合结果的所有集合
    //data = [101, 102, 103, 104]
}) 
//只需要id>100的一个值
mysql.table('table').where({id: ['>': 100]}).getField('id', true).then(function (data) {
    //data为数字,符合条件的第一个值
    //data = 101
})
//只需要id>100的3个值
mysql.table('table').where({id: ['>' 100]}).getField('id', 3).then(function (data) {
    //data为Array
    //data = [101, 102, 103]
})
//需要id和title两个字段的值
mysql.table('table').getField('id, title').then(function (data) {
    //data为对象
    /*
    data = {
        id: [101, 102, 103, 104],
        title: ['aaaa', 'bbbb', 'cccc', 'dddd']
    }
    */
})

countSelect(options, flag)

  • options 查询参数
  • flag Boolean 当分页值不合法的时候,处理情况。true为修正到第一页,false为修正到最后一页,默认不进行修正
  • return promise
//查询1-20条数据
mysql.table('table').page(1, 20).countSelect().then(function (data) {
    //data数据格式
    data = {
        count: 123, //总条数
        total: 7    //总页数
        page: 1     //当前页
        num: 20     //每页显示数量
        data: [{}, {}] //详细数据
    }
});

query(sql, parse)

自定义sql语句进行查询

  • sql String 要执行的sql语句
  • parse 格式参数的数据
  • return promise
var data = [
    '*',
    'table',
    'id > 100'
] 
mysql.query('SELECT %s FROM %s WHERE %s', data).then(function (data) {
})

execute(sql, parse)

自定义sql语句执行,使用与query相同,返回数据不同,execute返回影响行数

close()

关闭连接池连接,非特殊情况,不建议使用


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