Mysql-Mysql auto_increment usage problems

When I create a table, I set the id to autoincrement. later I found that the id should start from 1, but the result is increased from 2. I am using C ++, the following is some of my code: SQL _-& gt; SetAutoCommit (0); if (SQL _-& gt; InsertUserLoginTable (id, & quot;)-1) {result & quot; registfaild1 & quot;} else {std: stringIDsql _-& gt; GetLastID (); mysqlc ++

When I create a table, I set the id to auto increment. later I found that the id should start from 1, but the result is increased from 2. I am using C ++, below is some of my code:

        sql_->SetAutoCommit(0);        if(sql_->InsertUserLoginTable(id,"") == -1)        {            result = "regist faild1";        }        else        {            std::string ID = sql_->GetLastID();            std::cout << "ID : " << ID << std::endl;            if (sql_->InsertLoginInfoTable(ID, "", "", "", IMEI, BTMAC) == -1)            {                result = "regist faild2";            }            else if (sql_->InsertUserInfoTable(ID, FaceID, NickName, "", "", "3") == -1)            {                result = "regist faild3";            }            else if (sql_->InsertUserRecordTable(ID, RegistIP) == -1)            {                result = "regist faild4";            }            else            {                result = "regist success";            }        }        if(result == "regist success")        {            sql_->Commit(0);        }        else        {            sql_->Commit(1);        }        sql_->SetAutoCommit(1);

Some of them are self-encapsulated methods, and some are as follows:

Void SetAutoCommit (int I)
{
SQL-> AutoCommit (I );
}

Int Commit (int I)
{
SQL-> CommitSQL (I );
}

Void AutoCommit (int I)
{
Mysql_autocommit (connection _, I );
}

Int CommitSQL (int I)
{
If (I = 1)
{
Mysql_rollback (connection _);
Return-1;
}
Else
{
Mysql_commit (connection _);
Return 0;
}
}