tribedb/lib/query.js

Unlimited expansion MySQL cluster storage system

/**
 *
 * 数据请求
 * 
 */

// const Query = require("squel");

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



/**
 * 执行 sql 请求
 * opt = {
 *   read: 
 *   write: 
 * }
 */
exports.query = function(table, opt, SQL )
{
    if( !opt && !SQL ){
        throw new Error('TribeDB query need a sql string or builder with toString() !');
    }
    if( !SQL ){
        SQL = opt;
        opt = {};
    }
    if( SQL instanceof Object && SQL.toString ){
        SQL = SQL.toString(); // 支持 squel 对象
    }
    // 判断读写
    if( !opt.read && !opt.write  ){
        let operate = SQL.substr(0, 6).toLocaleLowerCase();
        if(operate == 'select'){
            opt.read = true;
        }else{
            opt.write = true;
        }
    }
    // 执行
    return new Promise(function (resolve, reject) {
        pool.conn(table, opt, function(err, conn){
            if(err){
                return reject(err);
            }
            conn.query(SQL, function(err, rows){
                // log(rows);
                conn.release(); // 必须释放回连接池！
                // that.reset(); // 重设
                if(err){
                    return reject(err);
                }
                resolve(rows); // 返回
            });
        });
    });


};



/**
 * 执行 sql 请求
 */
exports.Query = function( table, opt, SQL ){
    this._table = table;
    if( !opt && !SQL ){
        return this;
    }
    if( !SQL ){
        SQL = opt;
        opt = {};
    }
    if( SQL instanceof Object ){
        SQL = SQL.toString(); // 支持 squel 对象
    }
    var that = this;
    // die(SQL);
    return new Promise(function (resolve, reject) {
        pool.conn(table, opt, function(err, conn){
            conn.query(SQL, function(err, rows){
                // log(rows);
                conn.release(); // 必须释放回连接池！
                // that.reset(); // 重设
                err && reject(err);
                resolve(rows); // 返回
            });
        });
    });
};




/**
 * 操作封装
 */
exports.insert = require('./insert.js').insert;
exports.inserts = require('./insert.js').inserts;
exports.update = require('./update.js').update;
exports.delete = require('./delete.js').delete;
const select =  require('./select.js');
exports.select = select.select;
exports.select_merge = select.select_merge;
exports.select_attach = select.select_attach;











/*




var sleep = function (time) {
    return new Promise(function (resolve, reject) {
        setTimeout(function () {
            resolve();
            log(time);
        }, time*1000);
    })
};


var main = async function(){

    log('start');
    // await tribe.insert(2);
    await sleep(2);
    await sleep(3);
    log('end');

}; 

// main();




*/