准备好的语句可重新编译，从而获得更好的性能，在您反复执行同一操作时，它非常方便。
Prepared statements are recompiled for better performance and are convenient when you need to do the same thing over and over again.
不仅是把switch语句的范围扩展到字符串上，而且要扩展到其他类型上，这已经是多年来一直反复在提交的一个增强性请求了。
Extending the reach of the switch statement, not only to strings but also to other types, has been the subject of repeated enhancement requests over the years.
涉及阵列的Oracle应用程序经常利用批量绑定操，其针对阵列中的每个元素反复执行SQL dml语句。
Oracle applications involving arrays often make use of bulk bind operations, which execute SQL DML statements repeatedly, for each of the elements in an array.
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