tribedb/lib/update.js

Unlimited expansion MySQL cluster storage system

/**
 *
 * update
 * 
 */


const mysql = require('mysql');
const pool = require('./pool.js');


/**
 * 修改数据
 */
exports.update = function(table, data, where)
{
    if(typeof data == 'object'){
        let datastr = [];
        for(let i in data){
            let val = typeof data[i] == 'number' ? data[i] : mysql.escape(data[i]);
            datastr.push('`'+i+'`='+val);
        }
        if( ! datastr.length ){
            return resolve({}); // 返回
        }
        data = datastr.join(', ');
    }
    return new Promise(function (resolve, reject) {
        pool.conn(table, {write:1}, function(err, conn){
            if(err) return reject(err);
            where = where ? ' WHERE '+where : '';
            let sqlstr = "UPDATE `"+table+"` SET "+data+where;
            // console.log(sqlstr);
            conn.query(sqlstr, function(err, rows){
                conn.release(); // 必须释放回连接池！
                if(err) return reject(err);
                resolve(rows); // 返回
            });
        });
    })
};