MySQL 8.0 Query Rewrite支持DML

MySQL 8.0 Query Rewrite支持SELECT INSERT UPDETE DELETE REPLACE語句重寫

這個(gè)功能要點(diǎn)贊，比如開發(fā)上線時(shí)，有個(gè)SQL查詢字段索引忘記加了，直接把線上CPU打滿，此時(shí)，你可以將SQL重寫，讓業(yè)務(wù)先報(bào)錯(cuò)，別打死數(shù)據(jù)庫，然后馬上通知開發(fā)回滾，等加完索引后再上線。

安裝插件

mysql?-S?/tmp/mysql_hcy.sock?-p123456?<./install_rewriter.sql

查看是否生效

SHOW?GLOBAL?VARIABLES?LIKE?'rewriter_enabled';

編寫重寫規(guī)則

insert?into?query_rewrite.rewrite_rules(pattern,?replacement,?
pattern_database)?values?(
"SELECT?*?from?sbtest1?limit??",
"SELECT?k,c?from?sbtest1?limit??",
"test");

意思為：

將以下語句

SELECT * from sbtest1 limit ?;

改寫成：

SELECT k,c from sbtest1 limit ?;

注：?jiǎn)柼?hào)?為變量

執(zhí)行規(guī)則生效

CALL?query_rewrite.flush_rewrite_rules();

演示

mysql>?SELECT?*?from?sbtest1?limit?1\G;
***************************?1.?row?***************************
k:?499284
c:?83868641912-28773972837-60736120486-75162659906-27563526494-20381887404-41576422241-93426793964-56405065102-33518432330
1?row?in?set,?1?warning?(0.00?sec)
?
ERROR:?
No?query?specified
?
mysql>?show?warnings\G
***************************?1.?row?***************************
??Level:?Note
???Code:?1105
Message:?Query?'SELECT?*?from?sbtest1?limit?1'?rewritten?to?'SELECT?k,c?from?sbtest1?limit?1'?by?a?query?rewrite?plugin
1?row?in?set?(0.00?sec)