Golang C.sqlite3_enable_load_extension模块，常用函数和类-面圈网

作者：fclairam 项目：dron

// Open database and return a new connection.
// You can specify DSN string with URI filename.
//   test.db
//   file:test.db?cache=shared&mode=memory
//   :memory:
//   file::memory:
func (d *SQLiteDriver) Open(dsn string) (driver.Conn, error) {
	if C.sqlite3_threadsafe() == 0 {
		return nil, errors.New("sqlite library was not compiled for thread-safe operation")
	}

	var db *C.sqlite3
	name := C.CString(dsn)
	defer C.free(unsafe.Pointer(name))
	rv := C._sqlite3_open_v2(name, &db,
		C.SQLITE_OPEN_FULLMUTEX|
			C.SQLITE_OPEN_READWRITE|
			C.SQLITE_OPEN_CREATE,
		nil)
	if rv != 0 {
		return nil, Error{Code: ErrNo(rv)}
	}
	if db == nil {
		return nil, errors.New("sqlite succeeded without returning a database")
	}

	rv = C.sqlite3_busy_timeout(db, 5000)
	if rv != C.SQLITE_OK {
		return nil, Error{Code: ErrNo(rv)}
	}

	conn := &SQLiteConn{db}

	if len(d.Extensions) > 0 {
		rv = C.sqlite3_enable_load_extension(db, 1)
		if rv != C.SQLITE_OK {
			return nil, errors.New(C.GoString(C.sqlite3_errmsg(db)))
		}

		for _, extension := range d.Extensions {
			cext := C.CString(extension)
			defer C.free(unsafe.Pointer(cext))
			rv = C.sqlite3_load_extension(db, cext, nil, nil)
			if rv != C.SQLITE_OK {
				return nil, errors.New(C.GoString(C.sqlite3_errmsg(db)))
			}
		}

		rv = C.sqlite3_enable_load_extension(db, 0)
		if rv != C.SQLITE_OK {
			return nil, errors.New(C.GoString(C.sqlite3_errmsg(db)))
		}
	}

	if d.ConnectHook != nil {
		if err := d.ConnectHook(conn); err != nil {
			return nil, err
		}
	}
	runtime.SetFinalizer(conn, (*SQLiteConn).Close)
	return conn, nil
}

作者：npower 项目：gosqlit

// EnableLoadExtension enables or disables extension loading.
// (See http://sqlite.org/c3ref/enable_load_extension.html)
func (c *Conn) EnableLoadExtension(b bool) error {
	rv := C.sqlite3_enable_load_extension(c.db, btocint(b))
	if rv == C.SQLITE_OK {
		return nil
	}
	return c.error(rv, "Conn.EnableLoadExtension")
}

作者：matt 项目：go-sqlite

func (c *SQLiteConn) loadExtensions(extensions []string) error {
	rv := C.sqlite3_enable_load_extension(c.db, 1)
	if rv != C.SQLITE_OK {
		return errors.New(C.GoString(C.sqlite3_errmsg(c.db)))
	}

	for _, extension := range extensions {
		cext := C.CString(extension)
		defer C.free(unsafe.Pointer(cext))
		rv = C.sqlite3_load_extension(c.db, cext, nil, nil)
		if rv != C.SQLITE_OK {
			return errors.New(C.GoString(C.sqlite3_errmsg(c.db)))
		}
	}

	rv = C.sqlite3_enable_load_extension(c.db, 0)
	if rv != C.SQLITE_OK {
		return errors.New(C.GoString(C.sqlite3_errmsg(c.db)))
	}
	return nil
}

作者：matt 项目：go-sqlite

// LoadExtension load the sqlite3 extension.
func (c *SQLiteConn) LoadExtension(lib string, entry string) error {
	rv := C.sqlite3_enable_load_extension(c.db, 1)
	if rv != C.SQLITE_OK {
		return errors.New(C.GoString(C.sqlite3_errmsg(c.db)))
	}

	clib := C.CString(lib)
	defer C.free(unsafe.Pointer(clib))
	centry := C.CString(entry)
	defer C.free(unsafe.Pointer(centry))

	rv = C.sqlite3_load_extension(c.db, clib, centry, nil)
	if rv != C.SQLITE_OK {
		return errors.New(C.GoString(C.sqlite3_errmsg(c.db)))
	}

	rv = C.sqlite3_enable_load_extension(c.db, 0)
	if rv != C.SQLITE_OK {
		return errors.New(C.GoString(C.sqlite3_errmsg(c.db)))
	}

	return nil
}

作者：Wishing-Wal 项目：wishingwal

// Open database and return a new connection.
// You can specify DSN string with URI filename.
//   test.db
//   file:test.db?cache=shared&mode=memory
//   :memory:
//   file::memory:
// go-sqlite handle especially query parameters.
//   _loc=XXX
//     Specify location of time format. It's possible to specify "auto".
//   _busy_timeout=XXX
//     Specify value for sqlite3_busy_timeout.
//   _txlock=XXX
//     Specify locking behavior for transactions.  XXX can be "immediate",
//     "deferred", "exclusive".
func (d *SQLiteDriver) Open(dsn string) (driver.Conn, error) {
	if C.sqlite3_threadsafe() == 0 {
		return nil, errors.New("sqlite library was not compiled for thread-safe operation")
	}

	var loc *time.Location
	txlock := "BEGIN"
	busy_timeout := 5000
	pos := strings.IndexRune(dsn, '?')
	if pos >= 1 {
		params, err := url.ParseQuery(dsn[pos+1:])
		if err != nil {
			return nil, err
		}

		// _loc
		if val := params.Get("_loc"); val != "" {
			if val == "auto" {
				loc = time.Local
			} else {
				loc, err = time.LoadLocation(val)
				if err != nil {
					return nil, fmt.Errorf("Invalid _loc: %v: %v", val, err)
				}
			}
		}

		// _busy_timeout
		if val := params.Get("_busy_timeout"); val != "" {
			iv, err := strconv.ParseInt(val, 10, 64)
			if err != nil {
				return nil, fmt.Errorf("Invalid _busy_timeout: %v: %v", val, err)
			}
			busy_timeout = int(iv)
		}

		// _txlock
		if val := params.Get("_txlock"); val != "" {
			switch val {
			case "immediate":
				txlock = "BEGIN IMMEDIATE"
			case "exclusive":
				txlock = "BEGIN EXCLUSIVE"
			case "deferred":
				txlock = "BEGIN"
			default:
				return nil, fmt.Errorf("Invalid _txlock: %v", val)
			}
		}

		if !strings.HasPrefix(dsn, "file:") {
			dsn = dsn[:pos]
		}
	}

	var db *C.sqlite3
	name := C.CString(dsn)
	defer C.free(unsafe.Pointer(name))
	rv := C._sqlite3_open_v2(name, &db,
		C.SQLITE_OPEN_FULLMUTEX|
			C.SQLITE_OPEN_READWRITE|
			C.SQLITE_OPEN_CREATE,
		nil)
	if rv != 0 {
		return nil, Error{Code: ErrNo(rv)}
	}
	if db == nil {
		return nil, errors.New("sqlite succeeded without returning a database")
	}

	rv = C.sqlite3_busy_timeout(db, C.int(busy_timeout))
	if rv != C.SQLITE_OK {
		return nil, Error{Code: ErrNo(rv)}
	}

	conn := &SQLiteConn{db: db, loc: loc, txlock: txlock}

	if len(d.Extensions) > 0 {
		rv = C.sqlite3_enable_load_extension(db, 1)
		if rv != C.SQLITE_OK {
			return nil, errors.New(C.GoString(C.sqlite3_errmsg(db)))
		}

		for _, extension := range d.Extensions {
			cext := C.CString(extension)
			defer C.free(unsafe.Pointer(cext))
//.........这里部分代码省略.........

作者：pk 项目：gosqlit

// EnableLoadExtension enables or disables extension loading.
// (See http://sqlite.org/c3ref/enable_load_extension.html)
func (c *Conn) EnableLoadExtension(b bool) {
	C.sqlite3_enable_load_extension(c.db, btocint(b))
}

作者：robertknigh 项目：go-sqlite

// Open database and return a new connection.
// You can specify DSN string with URI filename.
//   test.db
//   file:test.db?cache=shared&mode=memory
//   :memory:
//   file::memory:
func (d *SQLiteDriver) Open(dsn string) (driver.Conn, error) {
	if C.sqlite3_threadsafe() == 0 {
		return nil, errors.New("sqlite library was not compiled for thread-safe operation")
	}

	var db *C.sqlite3
	name := C.CString(dsn)
	defer C.free(unsafe.Pointer(name))
	rv := C._sqlite3_open_v2(name, &db,
		C.SQLITE_OPEN_FULLMUTEX|
			C.SQLITE_OPEN_READWRITE|
			C.SQLITE_OPEN_CREATE,
		nil)
	if rv != 0 {
		return nil, ErrNo(rv)
	}
	if db == nil {
		return nil, errors.New("sqlite succeeded without returning a database")
	}

	rv = C.sqlite3_busy_timeout(db, 5000)
	if rv != C.SQLITE_OK {
		return nil, ErrNo(rv)
	}

	conn := &SQLiteConn{db}

	if len(d.Extensions) > 0 {
		rv = C.sqlite3_enable_load_extension(db, 1)
		if rv != C.SQLITE_OK {
			return nil, errors.New(C.GoString(C.sqlite3_errmsg(db)))
		}

		stmt, err := conn.Prepare("SELECT load_extension(?);")
		if err != nil {
			return nil, err
		}

		for _, extension := range d.Extensions {
			if _, err = stmt.Exec([]driver.Value{extension}); err != nil {
				return nil, err
			}
		}

		if err = stmt.Close(); err != nil {
			return nil, err
		}

		rv = C.sqlite3_enable_load_extension(db, 0)
		if rv != C.SQLITE_OK {
			return nil, errors.New(C.GoString(C.sqlite3_errmsg(db)))
		}
	}

	if d.ConnectHook != nil {
		if err := d.ConnectHook(conn); err != nil {
			return nil, err
		}
	}

	return conn, nil
}

Golang C.sqlite3_enable_load_extension类(方法)实例源码