306 lines
6.9 KiB
JavaScript
306 lines
6.9 KiB
JavaScript
/**
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*
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* @authors yutent (yutent@doui.cc)
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* @date 2017-12-14 02:41:15
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* @version $Id$
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*/
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const { escape } = require('mysql')
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function hideProperty(host, name, value) {
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Object.defineProperty(host, name, {
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value: value,
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writable: true,
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enumerable: false,
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configurable: true
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})
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}
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function getType(val) {
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if (val === null) {
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return String(val)
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}
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return Object.prototype.toString
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.call(val)
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.slice(8, -1)
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.toLowerCase()
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}
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function parse$or(arr) {
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let sql = ''
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for (let it of arr) {
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sql += '('
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if (it.$and) {
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sql += parse$and(it.$and)
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} else {
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sql += parse$opt(it)
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}
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sql += ') OR '
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}
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sql = sql.slice(0, -3)
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return sql
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}
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function parse$and(arr) {
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let sql = ''
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for (let it of arr) {
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sql += '('
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if (it.$or) {
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sql += parse$or(it.$or)
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} else {
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sql += parse$opt(it)
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}
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sql += ') AND '
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}
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sql = sql.slice(0, -4)
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return sql
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}
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function parse$opt(opt) {
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let sql = ''
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for (let k in opt) {
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let tmp = opt[k]
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switch (getType(tmp)) {
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case 'object':
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if (tmp.$like) {
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sql += ` ${k} LIKE ${escape(tmp.$like)} `
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break
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}
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if (tmp.$sql) {
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sql += ` ${k} ${tmp.$sql} `
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break
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}
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if (tmp.$in) {
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let list = tmp.$in.map(it => {
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return escape(it)
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})
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sql += ` ${k} IN (${list.join(',')}) `
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break
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}
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if (tmp.$between) {
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if (tmp.$between.length < 2) {
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throw new Error(`Array $between's length must be 2.`)
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}
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let list = tmp.$between.map(it => {
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return escape(it)
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})
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sql += ` ${k} BETWEEN ${list[0]} AND ${list[1]} `
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break
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}
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// 比较
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if (tmp.hasOwnProperty('$lt') || tmp.hasOwnProperty('$lte')) {
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let oc = tmp.hasOwnProperty('$lt') ? '<' : '<='
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let val = tmp.hasOwnProperty('$lt') ? tmp.$lt : tmp.$lte
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sql += ` ${k} ${oc} ${escape(val)} `
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if (tmp.hasOwnProperty('$gt') || tmp.hasOwnProperty('$gte')) {
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oc = tmp.hasOwnProperty('$gt') ? '>' : '>='
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val = tmp.hasOwnProperty('$gt') ? tmp.$gt : tmp.$gte
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sql += ` AND ${k} ${oc} ${escape(val)} `
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}
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break
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}
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if (tmp.hasOwnProperty('$gt') || tmp.hasOwnProperty('$gte')) {
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let oc = tmp.hasOwnProperty('$gt') ? '>' : '>='
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let val = tmp.hasOwnProperty('$gt') ? tmp.$gt : tmp.$gte
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sql += ` ${k} >${oc} ${escape(val)} `
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break
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}
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if (tmp.hasOwnProperty('$eq')) {
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sql += ` ${k} = ${escape(tmp.$eq)} `
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break
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}
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if (tmp.hasOwnProperty('$ne')) {
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sql += ` ${k} <> ${escape(tmp.$ne)} `
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break
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}
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default:
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sql += ` ${k} = ${escape(tmp)}`
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}
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sql += ' AND '
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}
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sql = sql.slice(0, -4)
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return sql
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}
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// 格式化表名
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function fixtable(name) {
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if (/ AS /i.test(name)) {
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return name
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}
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return name
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.split('.')
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.map(it => {
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return '`' + it + '`'
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})
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.join('.')
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}
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const parser = {
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leftJoin(tables = []) {
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let sql = ''
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for (let it of tables) {
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it.table = fixtable(it.table)
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sql += ` LEFT JOIN ${it.table} ON ${it.on} `
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}
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return sql
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},
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rightJoin(tables = []) {
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let sql = ''
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for (let it of tables) {
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it.table = fixtable(it.table)
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sql += ` RIGHT JOIN ${it.table} ON ${it.on} `
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}
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return sql
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},
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join(tables = []) {
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let sql = ''
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for (let it of tables) {
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it.table = fixtable(it.table)
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sql += ` JOIN ${it.table} ON ${it.on} `
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}
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return sql
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},
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filter(opt) {
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let sql = ''
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if (!opt) {
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return ' '
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}
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if (typeof opt === 'string') {
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sql += opt
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}
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if (typeof opt === 'function') {
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sql += opt()
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}
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if (typeof opt === 'object') {
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if (opt.$and) {
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sql += parse$and(opt.$and)
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} else if (opt.$or) {
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sql += parse$or(opt.$or)
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} else {
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sql += parse$opt(opt)
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}
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}
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sql = sql.trim()
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if (sql) {
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return ` WHERE ${sql} `
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} else {
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return ' '
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}
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},
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select(arr = ['*']) {
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return `SELECT ${arr.join(',')} `
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},
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// 排序 ----------------------------------
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sort(obj = {}) {
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let sort = ''
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for (let i in obj) {
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let c = ''
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if (obj[i] === -1) {
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c = 'DESC'
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}
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sort += `${i} ${c},`
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}
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if (sort) {
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return ' ORDER BY ' + sort.slice(0, -1)
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} else {
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return ''
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}
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},
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limit(...args) {
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return ` LIMIT ${args.join(',')} `
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},
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// 解析数据表的配置(新建表时)
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field(fields = []) {
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let primary = null
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let indexes = []
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let sql = `(\n`
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for (let it of fields) {
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it.type = it.type.toUpperCase()
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let inc = '' // 自增
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let autoUpdate = '' // 自动更新时间戳(仅 DATETIME & TIMESTAMP)
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let defaultVal = ''
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// 只处理1个主键, 其他的忽略, 且作为主键,必须 NOT NULL
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if (!primary && it.primary) {
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primary = `PRIMARY KEY (\`${it.name}\`)`
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it.notnull = true
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if (it.inc) {
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inc = 'AUTO_INCREMENT'
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}
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}
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let notnull = it.notnull ? 'NOT NULL' : 'NULL'
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if (/CHAR/.test(it.type)) {
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it.default = it.default ? escape(it.default) : ''
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}
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// 这几种类型,不允许设置默认值
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if (['TEXT', 'BLOB', 'JSON', 'GEOMETRY'].includes(it.type)) {
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notnull = 'NULL'
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}
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// 这2种类型,如果设置了自动更新时间戳, 则默认值自动改为当前时间戳
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if (['TIMESTAMP', 'DATETIME'].includes(it.type)) {
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if (it.update) {
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autoUpdate = 'ON UPDATE CURRENT_TIMESTAMP'
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it.default = 'CURRENT_TIMESTAMP'
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}
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}
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// 这3种时间类型,不允许设置默认值为 当前时间戳
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if (['TIME', 'DATE', 'YEAR'].includes(it.type)) {
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if (it.default.toUpperCase() === 'CURRENT_TIMESTAMP') {
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it.default = ''
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}
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}
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defaultVal = it.default ? `DEFAULT ${it.default}` : ''
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// 非主键下, 设置了unique & index时,都为索引
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if (!it.primary) {
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if (it.index || it.unique) {
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let idx = `INDEX \`${it.name}_idx\` (\`${it.name}\`)`
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if (it.unique) {
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idx = 'UNIQUE ' + idx
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}
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indexes.push(idx)
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}
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}
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sql += `\`${it.name}\` ${it.type} ${notnull} ${defaultVal} ${inc} ${autoUpdate},\n`
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}
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if (!primary) {
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throw new Error('Can not create table without primary key.')
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}
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sql += primary
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if (indexes.length) {
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sql += indexes.join(', \n') + ')'
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} else {
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sql += '\n)'
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}
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return sql
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}
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}
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class SqlErr {
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constructor(msg = '', sql = '') {
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this.message = msg
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this.sql = sql
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hideProperty(this, 'stack', msg)
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}
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toString() {
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return this.message
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}
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}
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exports.SqlErr = SqlErr
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exports.parser = parser
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exports.escape = escape
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exports.fixtable = fixtable
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