sqlite3怎样将A数据库表复制到另一个数据库

#include "stdio.h"
#include "sqlite3.h"

int  main()
{
    sqlite3 *db_source = NULL;
    sqlite3 *db_des = NULL;
    sqlite3_backup *bak;
    sqlite3_open( "c:\\test.db" ,&db_source);
    sqlite3_open( "c:\\test1.db" ,&db_des);
        bak=sqlite3_backup_init(db_des, "main" ,db_source, "main" );
    sqlite3_backup_step(bak,-1);
    sqlite3_backup_finish(bak);
    sqlite3_close(db_source);
    sqlite3_close(db_des);
    return  0;
}