Do I run that command from a prompt shell or from within mysql? Thanks in advance. Mysql> CREATE USER IDENTIFIED BY 'mypsswd' Mysql> create user 'sampadm localhost' identified by 'socrates'ĮRROR 1146 (42S02): Table 'mysql.procs_priv' doesn't exist I'm trying to create a user in MySql following the instructions from a book on MySql ( MySql Developer's Edition) I bought and I"m getting the following error: Posted: Mon 6:24 pm Post subject: Cant create user in MySql Gentoo Forums Forum Index Other Things Gentoo There is already something that I made roughly, but I will arrange it next time.Gentoo Forums :: View topic - Cant create user in MySql If you think about it, you can easily implement an initialized sequence using affected rows. In addition to limiting the number of event “apply count” for a certain period of time, it may be also necessary to keep “summarized data” on a daily or monthly basis. However, if you understand and use these behaviors, you can solve some kind of problems of getting more comfortable. This feature is depended on the DBMS, it is also (probably) dependent on MySQL. If there are no changes to the data, then there is only 0 Affected Rows. However, in Java, you need to add jdbc parameter useAffectedRows=true to get this nice result. Query OK, 2 rows affected (0.00 sec) <= Update to 1 (Initialized) Query OK, 0 rows affected (0.00 sec) <= No action Query OK, 2 rows affected (0.00 sec) <= Update to 5 Query OK, 2 rows affected (0.00 sec) <= Update to 4 Query OK, 2 rows affected (0.00 sec) <= Update to 3 Query OK, 2 rows affected (0.00 sec) <= Update to 2 Query OK, 1 row affected (0.00 sec) <= Insert 1 (First) In other words, to summarize, the following behavior can be expected. (No transaction, No several queries, Just 1 Query, Free lunch box) We don’t need to exectue another query to get the result, we can distinguish the result status and make variety message to users in application level. The meaning of affected rows is 2, regardless of whether initialization or increase, or whatever the user’s apply_count has been increased successfully. Īffected rows are returned as 2, and 0 is returned after apply_count is 5.Īfter 10 seconds the limited time, affected rows is returned to 2 and apply_count changed to 1. | user_id | apply_count | last_applied_time |Ģ rows affected means, target row exists and row has been updated because of unique constraints. Row = execute("SELECT * FROM user_event WHERE user_id = 100 FOR UPDATE") Normally, it would be implemented by bundling transactions as shown below.(This is just psudo code.) Participate only 5 times in a certiain cycle.If you have received the following requirements from the service planner: This looks nothing in your application, but if you think a little differently, you can get a free lunch, reducing amounts of queries. Affected rows in MySQLĪs I mentioned before, “Affected Rows” in MySQL means the row that has really changed. In this post I would like to talk about how to use “Affected Rows” to solve various requirements in a fun way. It is usally used to check to see how many rows has been changed since DML(insert/update/delete) was executed. Have you ever thought about using “Affected Rows” in your application?Īs you all know, “Affected Rows” is the number of data rows that actually affected by DML.
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