Pragma statements supported by SQLite PRAGMA语句是SQLite特有的SQL扩展,用于修改SQLite库的操作或查询SQLite库以查找内部(非表)数据。PRAGMA语句是使用与其他SQLite命令(例如SELECT,INSERT)相同的接口发布的,但在以下重要方面有所不同: 特定的杂注语句可能会被删除,而其他人可能会在未来的SQLite版本中添加。不保证向后...
PRAGMA schema.auto_vacuum; PRAGMA schema.auto_vacuum = 0 | NONE | 1 | FULL | 2 | INCREMENTAL;Query or set the auto-vacuum status in the database.The default setting for auto-vacuum is 0 or "none", unless the SQLITE_DEFAULT_AUTOVACUUM compile-time option is used. The "none" setting...
PRAGMA schema.application_id; PRAGMA schema.application_id = integer ; The application_id PRAGMA is used to query or set the 32-bit unsigned big-endian "Application ID" integer located at offset 68 into the database header. Applications that use SQLite as their application file-format should...
我的应用会跑一个vacuum,但只是每周一次(它在NSUserDefaults里存储上次vacuum的时间,然后在开始的时候检查是否过了一周)。 如果能auto_vacuum那更好,看pragma statements supported by SQLite列表。 其他酷的东西 Gus Mueller让我涉及自定义SQLite方法的内容。我并没有真的使用这些东西,既然他指出了,我...
通过与苹果工程师的交流,我们发现在 iOS 平台下还有 fullfsync (Pragma statements supported by SQLite) 这个选项,可以严格保证写入顺序跟提交顺序一致。设备开发商为了测评数据好看,往往会对提交的数据进行重排,再统一写入,亦即写入顺序跟App提交的顺序不一致。在某些情况下,例如断电,就可能导致写入文件不一致的情况,导...
结果为: seq name unique origin partial 0 sqlite_autoindex_words_2 1 u 0 1 sqlite_autoindex_words_1 1 pk 0 注意orign字段,主键 pk对应的是 sqlite_autoindex_words_1,可以看到主键先占用了序号1。 参考 The Schema Table Pragma statements supported by SQLite sqliteonline.com/编辑...
error LNK2019: 无法解析的外部符号 _sqlite3_activate_see ,该符号在函数 _sqlite3Pragma 中被引用 error LNK2019: 无法解析的外部符号 _sqlite3_key ,该符号在函数 _sqlite3Pragma 中被引用 fatal error LNK1120: 4 个无法解析的外部命令 这是正常的,因为Sqlite只留了接口而已,并没有给出实现。
On Windows, all applicable build products can be compiled with MSVC. First open the command prompt window associated with the desired compiler version (e.g. "Developer Command Prompt for VS2013"). Next, use NMAKE with the provided "Makefile.msc" to build one of the supported targets. ...
PRAGMA [database.]journal_mode; PRAGMA [database.]journal_mode = mode; There are six supported journal modes as listed below: Pragma ValueDescription DELETEThis is the default mode. Here at the conclusion of a transaction, the journal file is deleted. ...
Some example usages are changes like PRAGMA trusted_schema=OFF or functions like SELECT icu_load_collation(). If you execute these statements using #execSQL then they will only apply to a single database connection; using this method will ensure that they are uniformly ...