It then USES its parent request to find the right database statistics based on the connection's description, and to find statement statistics based on the SQL keystring.
然后它用它的双亲请求，根据连接的描述找到正确的数据库统计值，并根据sql键字符串找到语句统计值。
2
The key is hanging on a string by the door.
钥匙拴在门边的带子上。
《牛津词典》
3
Listing 2 shows a sample algorithm which creates such a key by string concatenation.