我创建了一个与应用内sqlite数据库配合使用的应用程序。在iOS 8.2之前，它工作得很好，但是在更新后，查询方法慢了约100倍！我尝试查找有关此问题的信息，但目前为止仍未找到任何信息。是否有人有同样的经历？这是我的方法，以前一直完美运行。您看到其中有任何错误或优化可能性吗？
谢谢您的帮助！
- (NSArray *)databaseContentWithQueryString:(NSString *)queryString {
NSDate *methodStart = [NSDate date];
NSMutableArray *retArray = [[NSMutableArray alloc] init];
sqlite3_stmt *statement;
if (sqlite3_prepare_v2(_database, [queryString UTF8String], -1, &statement, nil) == SQLITE_OK) {
while (sqlite3_step(statement) == SQLITE_ROW) {
int columnCount = sqlite3_column_count(statement);
NSMutableArray *valueArray = [[NSMutableArray alloc] init];
NSMutableArray *keyArray = [[NSMutableArray alloc] init];
for (int i=0; i<columnCount; i++) {
int type = sqlite3_column_type(statement, i);
char *name = (char *) sqlite3_column_name(statement, i);
[keyArray addObject:[NSString stringWithFormat:@"%s",name]];
int intVal;
char *charVal;
if (type == SQLITE_INTEGER) {
intVal = sqlite3_column_int(statement, i);
[valueArray addObject:[NSNumber numberWithInt:intVal]];
}
if (type == SQLITE_TEXT) {
charVal = (char *) sqlite3_column_text(statement, i);
[valueArray addObject:[NSString stringWithUTF8String:charVal]];
}
if (type == SQLITE_NULL) {
intVal = 0;
[valueArray addObject:[NSNumber numberWithInt:intVal]];
}
}
NSDictionary *dict = [[NSDictionary alloc] initWithObjects:valueArray forKeys:keyArray];
[retArray addObject:dict];
}
sqlite3_finalize(statement);
}
//sqlite3_close(_database);
NSDate *methodFinish = [NSDate date];
NSTimeInterval executionTime = [methodFinish timeIntervalSinceDate:methodStart];
NSLog(@"executionTime = %f s", executionTime);
return retArray;
}