我正在开发一款使用Android操作系统的数据库应用程序。我只是想知道哪个code执行速度更快，它们之间有什么区别呢？

查询 - 1 =

  db.rawQuery（SELECT * FROM USER_TABLE，其中user_ID的=+用户id，NULL）;
 

查询 - 2 =

  db.query（USER_TABLE_NAME，ALL_COLUMNS，USER_ID =+用户id，NULL，NULL，NULL，NULL）;
 

解决方案

看着SQLiteDatabase.java在Android源代码显示，查询（..）最终调用QueryBuilder的打造查询作为一个字符串，然后将其基本要求rawQuery（）。他们应该是大体相当，假设你也做了同样的工作，以建立自己的声明。

I am developing one android database application . I just want to know which code execute faster and what is the difference between them?

Query - 1 =

db.rawQuery("select * from user_table where user_id =" + userId, null);

Query - 2 =

db.query(USER_TABLE_NAME, ALL_COLUMNS, "user_id = " + userId, null, null, null, null);

Looking at SQLiteDatabase.java in the android source shows that the query(..) ends up calling the QueryBuilder to build the query as a single string and then it essentially calls rawQuery(). They should be roughly equivalent, assuming that you also did the same work to build your own statement.