Mysql SQL选择为-前置文本

是否可以将文本前置到SQL select语句中。e、 g:

var query = "SELECT id, " +
                   "picture " 
            "FROM people";

到

---

对。大概是这样的：

  var query = "SELECT id, " +
              "concat('./directory/',picture) AS  picture "
              "FROM people";

---

更多细节：

您正在将查询构造为字符串，因此可以这样做。但是，必须将该值作为常量插入。比如：

var query = "SELECT id, " +
                   "picture AS " + directory " + "picture "
            "FROM people";

但是，

目录

需要是应用程序中的值，而不是数据库中的值（尽管另一条语句可以读取它）

var query = "SELECT id, " +
                   "picture AS " + directory " + "picture "
            "FROM people";