If mysql has an id, set data to increase by 1. If no id exists, add it. Java month Calculation Comparison, mysql. java

If mysql has an id, set data to increase by 1. If no id exists, add it. Java month Calculation Comparison, mysql. java

</pre><pre name="code" class="sql">INSERT INTO invite_rejectlog_num (player_id,MONTH,count,last_modify_time)VALUES (#{playerId},#{month},#{count},#{lastModifyTime})ON DUPLICATE KEY UPDATE count=count+1;

The unique constraint id and month are required.

Calculation and comparison of ava months

Calendar calDelM = Calendar. getInstance (); calDelM. set (Calendar. MONTH, 0); System. out. println (calDelM. get (Calendar. MONTH); calDelM. add (Calendar. MONTH,-1); System. out. println (calDelM. get (Calendar. MONTH); // ix traverses the MONTH int isdel = calDelM. get (Calendar. MONTH); int ix = 8; // The minimum cache MONTH: Calendar ar calDelM2 = Calendar. getInstance (); calDelM2.set (Calendar. MONTH, ix); ix = calDelM2.get (Calendar. MONTH); // ix <isdelCale Ndar calDelM3 = Calendar. getInstance (); calDelM3.set (Calendar. MONTH, calDelM. get (Calendar. MONTH); for (; calDelM2.compareTo (calDelM3 )! =-1;) {System. out. println ("===================="); System. out. println ("calDelM2:" + calDelM2.get (Calendar. MONTH) + "" + "calDelM:" + calDelM. get (Calendar. MONTH) + "calDelM3:" + calDelM3.get (Calendar. MONTH); System. out. println (calDelM2.compareTo (calDelM3); calDelM. add (Calendar. MONTH,-1); isdel = calDelM. get (Calendar. MONTH); calDelM3.set (Calendar. MONTH, calDelM. get (Calendar. MONTH); System. out. println ("del:" + isdel); System. out. println ("====================== ");}