[大数据]No database selected Query问题

数据库没有被选中

加上数据库名.表名后

@Override
    public int queryCount(String username, String password) {
        String sql = "select count(1) from qf_p2_community_ms.admins where `username`=? and `password`=?";
        Object[] args = {username, password};
        Number count = (Number) queryForSingleValue(sql, args);
        return count.intValue();
    }

由此可知，写properties时，连接没有写好，很有可能是数据库名那写的有问题。

连接数据库名正确写法

url=jdbc:mysql://localhost:3306/qf_p2_community_ms?useUnicode=true&characterEncoding=utf-8&useSSL=true

去掉数据库.

String sql = "select count(1) from admins where `username`=? and `password`=?";

运行成功