ios 控制数据库的版本号

1.查询版本号

PRAGMA user_version  

1.设置版本号

PRAGMA user_version =  %d;

- (uint32_t)userVersion 

{

    uint32_t r = 0;

    

    FMResultSet *rs = [self executeQuery:@"pragma user_version"];

    

    if ([rs next]) {

        r = (uint32_t)[rs longLongIntForColumnIndex:0];

    }

    

    [rs close];

    return r;

}

- (void)setUserVersion:(uint32_t)version

 {

    NSString *query = [NSString stringWithFormat:@"pragma user_version = %d", version];

    FMResultSet *rs = [self executeQuery:query];

    [rs next];

    [rs close];

}