SQLite使用技巧
SQLite使用技巧,是以文件的形式存在磁盘中，每次访问时都要打开一次文件，如果对数据进行大量操作时，会很慢~解决办法是用事务的
是以文件的形式存在磁盘中，每次访问时都要打开一次文件，如果对数据进行大量操作时，会很慢~
解决办法是用事务的形式提交：因为我们开始事务后，进行大量操作的语句都保存在内存中，当提交时才全部写入数据库，，此时，数据库文件也就只用打开一次。
sql语句：
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