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| const mysql = require("mysql"); class db { constructor(databaseName){ this.connection = mysql.createPool({ host:"localhost", user:"root", password:"123456", database:databaseName }) this.common = [ { message: "服务器出现问题", status: 500 }, { message: "无法访问资源", status: 404 }, ] }
select(name,tableName,options) { let self = this return new Promise((resolve, reject) =>{
self.connection.getConnection(function (err, conn) { if(err){ console.log(err) reject (self.common[0]) }else{ let sql = `select ${name.toString()} from ${tableName} ${options}` console.log(sql) conn.query(sql,function (err, result) { if(err){ reject (self.common[1]) } conn.release() console.log({ status: 200, message:'成功', data:result }) resolve({ status: 200, message:'成功', data:result }) }) } }) }).catch(err => err) }
insert(tableName,name, value){ let self = this; return new Promise((resolve,reject) => { self.connection.getConnection(function(err, conn){ if(err){ console.log(err) reject(self.common[0]) }else{ let sql = `insert into ${tableName} (${name}) values (${value})` conn.query(sql,function(err, result){ if(err){ console.log(err) reject(self.common[1]) } conn.release(); resolve({ message:'成功', status:200, data: result }) }) } }) }).catch(err =>{ return err }) }
update(tableName,name,value, option){ let self = this; return new Promise((resolve, reject) => { self.connection.getConnection(function(err, conn){ if(err){ console.log(err); reject (self.common[0]) }else{ let sql = `update ${tableName} set ${name} = ${value} ${option}` conn.query(sql, function(err, result) { if(err){ console.log(err); reject(self.common[1]) } conn.release(); resolve({ message:'成功', status:'200', data:result }) }) } }) }).catch(err => err) }
delete(tableName, option){ let self = this new Promise((resolve, reject) => { self.connection.getConnection(function(err, conn) { if(err){ console.log(err); reject(self.common[0]) }else{ let sql = `DELETE FROM ${tableName} ${option}` conn.query(sql, function(err, result) { if(err){ reject(self.common[1]) } conn.release(); console.log({ data:result, message:"成功", status:200 }) resolve({ data:result, message:"成功", status:200 }) }) } }) }).catch(err => err) } } module.exports = db
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