自封装node 的简单增删改查

1 首先引入的上篇node 链接mysql 里面的js

var connect = require('./nodemysql.js');

2 定义常量

const customerSQL = {

    queryAll: function(dbname, callback, obj) { //obj查找的条件 若没有全部返回
        var where = ''
        if (obj == undefined) {
            where = ''
        } else {
            var s = ' WHERE '
            for (var i in obj) {
                s += i + '="' + obj[i] + '" and '
            }
            where = s.substring(0, s.lastIndexOf(' and'))
        }
        var sql = 'SELECT * FROM ' + dbname + where;
        console.log(sql)
        connect.query(sql, function(err, result) {
                if (err) {
                    console.log('[SELECT ERROR] - ', err.message);
                    callback({ code: 0, mes: err.message })
                    return;
                }
                callback({ code: 1, res: result })
                return;
            })
            // console.log(result);

    },
    insert: function(dbname, callback, obj) { //obj插入的数据
        var sql = 'insert into ' + dbname + ' set ?'
        console.log(sql)

        connect.query(sql, obj, function(err, result) {
            if (err) {
                console.log('[insert ERROR] - ', err.message);
                callback({ code: 0, mes: err.message })
                return;
            }
            callback({ code: 1, res: result })
                //             {
                //   "code": 1,
                //   "res": {
                //     "fieldCount": 0,
                //     "affectedRows": 1,
                //     "insertId": 16,//插入行的id
                //     "serverStatus": 2,
                //     "warningCount": 0,
                //     "message": "",
                //     "protocol41": true,
                //     "changedRows": 0
                //   }
                // }
            return;
        })
    },
    update: function(dbname, callback, arr) { //[{},{}] 第一个obj是要改的数据 第二个obj是查询条件
        var where = ''
        var obj = arr[1]
        if (obj == undefined) {
            callback({ code: 0, mes: 'no key' });
            return;
        } else {
            var s = ' where '
            for (var i in obj) {
                s += i + '="' + obj[i] + '" and '
            }
            where = s.substring(0, s.lastIndexOf(' and'));
        }
        var sql = 'update ' + dbname + ' set ?' + where;

        connect.query(sql, arr[0], function(err, result) {
            if (err) {
                console.log('[update ERROR] - ', err.message);
                callback({ code: 0, mes: err.message })
                return;
            }
            callback({ code: 1, res: result });
            //                 {
            //   "code": 1,
            //   "res": {
            //     "fieldCount": 0,
            //     "affectedRows": 1,
            //     "insertId": 0,
            //     "serverStatus": 34,
            //     "warningCount": 0,
            //     "message": "(Rows matched: 1  Changed: 1  Warnings: 0",
            //     "protocol41": true,
            //     "changedRows": 1 //被改变的行数
            //   }
            // }
            return;
        })

    },
    delete: function(dbname, callback, obj) {
        var where = ''
        if (obj == undefined) {
            callback({ code: 0, mes: 'no key' });
            return;
        } else {
            var s = ' WHERE '
            for (var i in obj) {
                s += i + '="' + obj[i] + '" and '
            }
            where = s.substring(0, s.lastIndexOf(' and'))
        }
        var sql = 'delete  from ' + dbname + where;

        connect.query(sql, function(err, result) {
                if (err) {
                    console.log('[delete ERROR] - ', err.message);
                    callback({ code: 0, mes: err.message })
                    return;
                }
                callback({ code: 1, res: result });
                //                 {
                //   "code": 1,
                //   "res": {
                //     "fieldCount": 0,
                //     "affectedRows": 1,//受影响的行数
                //     "insertId": 0,
                //     "serverStatus": 2,
                //     "warningCount": 0,
                //     "message": "",
                //     "protocol41": true,
                //     "changedRows": 0
                //   }
                // }
                return;
            })
            // console.log(result);

    },

};

　3 、输出常量和connet

module.exports = { customerSQL, connect };

4、 使用

查询：

var { customerSQL, connect } = require('./customersql.js');
app.get('/bayid', function(req, res) {

    var i = req.query.id ? { id: req.query.id } : undefined
    var show = function(result) {
        res.send(result);
    }
    customerSQL.queryAll('fruit', show, i)

});

　修改：

router.post('/setname', function(req, res, next) {
    var ss = req.body.name
    if (ss == undefined) {
        res.json({
            code: 0,
            message: '修改错误，没有key'
        })
        return
    };
    var nickname = {
        name: ss
    };
    var show = function(result) {
        console.log(result)

        var r = {}
        if (result.code == 0) {
            res.json({
                code: 0,
                message: '修改失败'
            })
        } else {
            res.json({
                code: 1,
                message: '修改成功'
            })
        }

    };
    customerSQL.update('user', show, [nickname, { id: 69 }])

});