Sqlite参考手册
C界面 | C Interface
Automatically Load Statically Linked Extensions
int sqlite3_auto_extension(void(*xEntryPoint)(void));
This interface causes the xEntryPoint() function to be invoked for each new database connection that is created. The idea here is that xEntryPoint() is the entry point for a statically linked SQLite extension that is to be automatically loaded into all new database connections.
Even though the function prototype shows that xEntryPoint() takes no arguments and returns void, SQLite invokes xEntryPoint() with three arguments and expects an integer result as if the signature of the entry point where as follows:
int xEntryPoint(
sqlite3 *db,
const char **pzErrMsg,
const struct sqlite3_api_routines *pThunk
);
If the xEntryPoint routine encounters an error, it should make *pzErrMsg point to an appropriate error message (obtained from sqlite3_mprintf()) and return an appropriate error code. SQLite ensures that *pzErrMsg is NULL before calling the xEntryPoint(). SQLite will invoke sqlite3_free() on *pzErrMsg after xEntryPoint() returns. If any xEntryPoint() returns an error, the sqlite3_open(), sqlite3_open16(), or sqlite3_open_v2() call that provoked the xEntryPoint() will fail.
Calling sqlite3_auto_extension(X) with an entry point X that is already on the list of automatic extensions is a harmless no-op. No entry point will be called more than once for each database connection that is opened.
See also: sqlite3_reset_auto_extension() and sqlite3_cancel_auto_extension()
See also lists of Objects, Constants, and Functions.
SQLite is in the Public Domain.
https://sqlite.org/c3ref/auto_extension.html
C界面 | C Interface相关
SQLite,是一款轻型的数据库,是遵守ACID的关系型数据库管理系统,它包含在一个相对小的C库中。它是D.RichardHipp建立的公有领域项目。它的设计目标是嵌入式的,而且目前已经在很多嵌入式产品中使用了它,它占用资源非常的低,在嵌入式设备中,可能只需要几百K的内存就够了。它能够支持Windows/Linux/Unix等等主流的操作系统,同时能够跟很多程序语言相结合,比如 Tcl、C#、PHP、Java等,还有ODBC接口,同样比起Mysql、PostgreSQL这两款开源的世界著名数据库管理系统来
主页 | https://sqlite.org/ |
源码 | https://www.sqlite.org/src/ |
发布版本 | 3.21.0 |