我有一个由Django管理命令生成的Spatialite数据库，我将其嵌入到iOS应用程序中。数据库打开完美，但我发现在iOS上查询数据库只有在我在64位设备上运行时才有效。模拟或其他任何设备在调用SQLITE_NOTADB时会生成输出sqlite3_prepare_v2，并显示错误消息file is encrypted or is not a database。
显然，生成这个数据库的Mac是64位机器，但SQLite数据库应该是位不可知的，所以我不知道这应该是一个什么问题。也许这不适用于Spatialite数据库？是否有任何标志我可以使用任何SQLite函数（可能是sqlite3_open或sqlite3_prepare_v2或者pragma命令）来使它以与64-相同的方式读取文件有点拱形iOS吗？或者也许有一种方法可以用更平台兼容的格式从django生成Spatialite数据库？欢迎任何建议。
以下是我的代码片段，如果有人能找到任何明显的问题：
@implementation DataModel
@synthesize db;
- (id) init {
self = [super init];
if (self != nil) {
spatialite_init(1);
sqlite3 *newDbConnection;
if (sqlite3_open([[self spatialiteDbPath] UTF8String], &newDbConnection) == SQLITE_OK) {
NSLog(@"Database opened successfully");
db = newDbConnection;
} else {
NSLog(@"Error opening database");
db = NULL;
}
}
return self;
}
- (NSArray *) getLockupsForRegion: (MKCoordinateRegion) region {
NSMutableArray *lockups = [[NSMutableArray alloc] init];
NSString *query = [NSString stringWithFormat:@"\
SELECT name, X(location) as lat, Y(location) as lon, \
covered, type, capacity \
FROM lockups_lockup \
WHERE WITHIN(location, GeomFromText('POLYGON((%f %f, %f %f, %f %f, %f %f))'));",
regionCorners[0].latitude, regionCorners[0].longitude,
regionCorners[1].latitude, regionCorners[1].longitude,
regionCorners[2].latitude, regionCorners[2].longitude,
regionCorners[3].latitude, regionCorners[3].longitude];
sqlite3_stmt *statement;
if(db &&
sqlite3_prepare_v2(db, [query UTF8String], -1, &statement, NULL) == SQLITE_OK) {
while(sqlite3_step(statement) == SQLITE_ROW) {
NSLog(@"A row");
}
} else {
NSLog(@"Query failed for reason: %s", sqlite3_errmsg(db));
NSLog(@"Sqlite version: %s", sqlite3_version);
}
return lockups;
}
@end
启动应用程序并在非64位iOS平台getLockupsForRegion:上运行会生成日志输出：
SpatiaLite version ..: 4.1.1 Supported Extensions:
- 'VirtualShape' [direct Shapefile access]
- 'VirtualDbf' [direct DBF access]
- 'VirtualText' [direct CSV/TXT access]
- 'VirtualNetwork' [Dijkstra shortest path]
- 'RTree' [Spatial Index - R*Tree]
- 'MbrCache' [Spatial Index - MBR cache]
- 'VirtualSpatialIndex' [R*Tree metahandler]
- 'VirtualFDO' [FDO-OGR interoperability]
- 'SpatiaLite' [Spatial SQL - OGC]
PROJ.4 version ......: Rel. 4.8.0, 6 March 2012
GEOS version ........: 3.4.2-CAPI-1.8.2 r3921
2013-12-31 00:29:39.567 App[8320:70b] Database opened successfully
2013-12-31 00:29:48.128 App[8320:70b] Query failed for reason: file is encrypted or is not a database
2013-12-31 00:29:48.710 App[8320:70b] Sqlite version: 3.8.1
arm64下的日志输出：
SpatiaLite version ..: 4.1.1 Supported Extensions:
- 'VirtualShape' [direct Shapefile access]
- 'VirtualDbf' [direct DBF access]
- 'VirtualText' [direct CSV/TXT access]
- 'VirtualNetwork' [Dijkstra shortest path]
- 'RTree' [Spatial Index - R*Tree]
- 'MbrCache' [Spatial Index - MBR cache]
- 'VirtualSpatialIndex' [R*Tree metahandler]
- 'VirtualFDO' [FDO-OGR interoperability]
- 'SpatiaLite' [Spatial SQL - OGC]
PROJ.4 version ......: Rel. 4.8.0, 6 March 2012
GEOS version ........: 3.4.2-CAPI-1.8.2 r3921
2013-12-31 01:10:34.491 App[8548:70b] Database opened successfully
2013-12-31 01:10:44.913 App[8548:70b] A row
2013-12-31 01:10:44.913 App[8548:70b] A row
2013-12-31 01:10:44.914 App[8548:70b] A row
2013-12-31 01:10:44.914 App[8548:70b] A row
2013-12-31 01:10:44.915 App[8548:70b] A row
2013-12-31 01:10:44.915 App[8548:70b] A row
2013-12-31 01:10:44.916 App[8548:70b] A row
2013-12-31 01:10:44.916 App[8548:70b] A row
版本：
对此的任何建议都将非常感谢！