mysqlmongodb
/**
* 校验用户名是否注册
* @param loginname
* @return
* @throws sqlexception
*/
public boolean ajaxvalidateloginname(string loginname) throws sqlexception {
string sql = select count(1) from t_user where loginname=?;
number number = (number)qr.query(sql, new scalarhandler(), loginname);
return number.intvalue() == 0;
}
/** * 校验email是否注册 * @param email * @return * @throws sqlexception */public boolean ajaxvalidateemail(string email) throws sqlexception { string sql = select count(1) from t_user where email=?; number number = (number)qr.query(sql, new scalarhandler(), email); return number.intvalue() == 0;}/** * 用户名注册校验 * @param loginname * @return */public boolean ajaxvalidateloginname(string loginname) { try { return userdao.ajaxvalidateloginname(loginname); } catch (sqlexception e) { throw new runtimeexception(e); }}/** * email校验 * @param email * @return */public boolean ajaxvalidateemail(string email) { try { return userdao.ajaxvalidateemail(email); } catch (sqlexception e) { throw new runtimeexception(e); }}这是用mysql语法写的，如果用的是mongo该怎么写呢，求教