The database server automatically issues the preparestatement to update any prepared objects that reference the table.
数据库服务器自动发出PREPARE命令，更新引用该表的任何编译过的对象。
2
Use parameter markers to prepare an SQL statement once, and then reuse it many times.
只需在sql语句中使用一次参数标记，然后就可以多次重用。
3
It means that when an SQL statement is going to be executed more than once, the developer should prepare the statement just once and then reuse the prepared statements for consecutive executions.