Flask+MySQL大数据表格分页显示

1、显示效果

界面主要由两部分完成
顶部搜索栏:按条件传参给后端请求,控制表格数据重载刷新
底部表格:接收后端返回JSON数据,对表格渲染显示
Flask+MySQL大数据表格分页显示_第1张图片

2、前端传参

前端采用Layui框架渲染,对页码和条数传参给后台做条件查询;
得到后端返回数据,对前端表格进行重载刷新

顶部搜索栏HTML

<div class="layui-col-md12 x-so">
    <input class="layui-input" autocomplete="off" placeholder="开始日" name="start" id="start">
    <input class="layui-input" autocomplete="off" placeholder="截止日" name="end" id="end">
    <input type="text" name="keyword" id="keyword" placeholder="搜索关键字" autocomplete="off" class="layui-input">
    <button class="layui-btn" id="serach" data-type="reload"><i class="layui-icon">i>button>
div>

表格渲染

var table = layui.table;
table.render({
    elem: '#allData'
    , id: 'allDataTable'
    , height: 400   //容器高度
    , url: '/query' //数据接口
    , method: 'post'
    , where: {
        name: 'test',
        startDate:'',
        endDate: '',
        keyword: ''} // 默认传参 limit,page
    , page: true    //开启分页
    , limits: [10, 50, 100, 500, 1000]  // 显示页数
    , cols: [[      //表头
        {field: 'host', title: 'Host', width: 130, sort: true, fixed: 'left'}
        , {field: 'address', title: '地址', width: 150, sort: true}
        , {field: 'user', title: '用户名', width: 85, sort: true}
        , {field: 'pw', title: '密码', width: 100, sort: true}
        , {field: 'new_user', title: '新增用户', width: 95, sort: true}
        , {field: 'new_pw', title: '新增密码', width: 95, sort: true}
        , {field: 'systemt', title: '系统配置', width: 95, sort: true}
        , {field: 'UpdateTime', title: '更新时间', width: 145, sort: true}
        , {field: 'mark', title: '备注', width: 70, sort: true}
        , {field: 'target', title: '来源', width: 80}
    ]]
});

表格重载

var active = {
    reload: function () {
        var _startDate = $('#start').val();
        var _endDate = $('#end').val();
        var _keyword = $('#keyword').val();

        var index = layer.msg('查询中,请稍等...', {icon: 16, time: false, shade: 0});
        setTimeout(function () {
            table.reload('allDataTable', { // 重载表格
                page: {curr: 1}, // 重新从第一页开始
                where: {
                    startDate: _startDate,
                    endDate: _endDate,
                    keyword: _keyword
                }
            });
            layer.close(index);
        }, 800);
    }
};
$('#serach').on('click', function () {
    var type = $(this).data('type');
    active[type] ? active[type].call(this) : '';
});

3、后端接收请求

设定POST请求方式,通过 request.form 接收前端参数
路由共实现两个数据查询的功能(Filter)

1、查询总数
query(db.func.count(table.c.host)).scalar()
2、查询条目明细
dquery(table).filter(rule).limit(limit).offset((int(page) - 1))

根据 Layui 官方默认的JSON数据样式,最终返回格式如下:
{ "code": 0,"msg": "","count": 1000,"data": [{}, {}]}

完整代码:

@app.route('/query', methods=['POST'])
def query():
    form_dict = request.form
    name = form_dict['name']
    limit = form_dict['limit']
    page = form_dict['page']
    startDate = form_dict['startDate']
    endDate = form_dict['endDate']
    keyword = form_dict['keyword']

    data = {"code": 0, "msg": "Successful", }
    try:
        table = all_table[name]
        _count = db.session.query(db.func.count(table.c.host)).scalar()
        # result = db.session.query(table).all()
        # result = db.session.query(table).filter(table.c.address.like('%上海%')).limit(limit).offset((int(page) - 1))

        if keyword == '':
            if startDate == '' or endDate == '':
                rule = table.c.host.like('%.%')
                _count = db.session.query(db.func.count(table.c.host)).scalar()
            else:
                rule = table.c.UpdateTime.between(startDate, endDate)
                _count = db.session.query(db.func.count(table.c.host)).filter(rule).scalar()
        else:
            if startDate == '' or endDate == '':
                rule = or_(table.c.host.like('%' + str(keyword) + '%'),
                           table.c.address.like('%' + str(keyword) + '%'),
                           table.c.user.like('%' + str(keyword) + '%'),
                           table.c.pw.like('%' + str(keyword) + '%'),
                           table.c.new_user.like('%' + str(keyword) + '%'),
                           table.c.new_pw.like('%' + str(keyword) + '%'),
                           table.c.target.like('%' + str(keyword) + '%'),
                           table.c.systemt.like('%' + str(keyword) + '%'),
                           table.c.mark.like('%' + str(keyword) + '%')
                           )
                _count = db.session.query(db.func.count(table.c.host)).filter(rule).scalar()
            else:
                rule = and_(
                    table.c.UpdateTime.between(startDate, endDate),
                    or_(table.c.host.like('%' + str(keyword) + '%'),
                        table.c.address.like('%' + str(keyword) + '%'),
                        table.c.user.like('%' + str(keyword) + '%'),
                        table.c.pw.like('%' + str(keyword) + '%'),
                        table.c.new_user.like('%' + str(keyword) + '%'),
                        table.c.new_pw.like('%' + str(keyword) + '%'),
                        table.c.target.like('%' + str(keyword) + '%'),
                        table.c.systemt.like('%' + str(keyword) + '%'),
                        table.c.mark.like('%' + str(keyword) + '%')
                        )
                )
                _count = db.session.query(db.func.count(table.c.host)).filter(rule).scalar()

        result = db.session.query(table).filter(rule).limit(limit).offset(int(page) - 1))
        data['count'] = _count
        data['data'] = [x._asdict() for x in result]
        # UpdateTime日期格式化输出
        for i in range(len(data['data'])):
            if data['data'][i]['UpdateTime']:
                data['data'][i]['UpdateTime'] = data['data'][i]['UpdateTime'].strftime("%Y-%m-%d %H:%M:%S")
    except Exception as err:
        data['code'] = 1
        data['msg'] = 'Failed! {}'.format(err)
        
    return jsonify(data)

Tip:
Flask sqlalchemy 映射关联已存在表的两种方法
Table 数据表格官方文档 - layui.table

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