Movatterモバイル変換

A server-side plugin namedRewriter examines statements and may rewrite them, based on its in-memory cache of rewrite rules.

These statements are subject to rewriting:SELECT,INSERT,REPLACE,UPDATE, andDELETE.

Standalone statements and prepared statements are subject to rewriting. Statements occurring within view definitions or stored programs are not subject to rewriting.

TheRewriter plugin uses a database namedquery_rewrite containing a table namedrewrite_rules. The table provides persistent storage for the rules that the plugin uses to decide whether to rewrite statements. Users communicate with the plugin by modifying the set of rules stored in this table. The plugin communicates with users by setting themessage column of table rows.

Thequery_rewrite database contains a stored procedure namedflush_rewrite_rules() that loads the contents of the rules table into the plugin.

A loadable function namedload_rewrite_rules() is used by theflush_rewrite_rules() stored procedure.

TheRewriter plugin exposes system variables that enable plugin configuration and status variables that provide runtime operational information. This plugin also supports a privilege (SKIP_QUERY_REWRITE) that protects a given user's queries from being rewritten.