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资源说明：ActiveRecord plugin for writing rows count information in query log
RowsLogger ========== This plugin offers rich information about result sets to AR logs. Usage ===== Just enjoy Rails as usual. Example ======= Consider some read operations like this. Member.count Member.find(:all) That usually makes following log. SQL (0.000300) SELECT count(*) AS count_all FROM members Member Load (0.000482) SELECT * FROM members RowsLogger appends information about rows count to the log. SQL (0.000301) (1 Row) SELECT count(*) AS count_all FROM members Member Load (0.000415) (3 Rows) SELECT * FROM members For Developpers =============== This plugin modfies following methods. 'ConnectionAdapters::AbstractAdapter#log' 'ConnectionAdapters::AbstractAdapter#log_info'ConnectionAdapters::AbstractAdapter#log --> log_info(sql, name, seconds) ConnectionAdapters::AbstractAdapter#log --> log_info(sql, name, seconds, result = nil) --> log_result_info(result) --> ConcreteAdapter#count_result(result) ConnectionAdapters::MysqlAdapter#count_result protected def count_result(result) result.num_rows end Count Result Method =================== The 'count_result' method of Adapter class should return count of result set from 'result' object, where 'result' is an object generated by 'log' method. This is used as result information. For exmaple, although this is nonsencial definition, def count_result(result) 0 end this code always appends "(0 Rows)" to the log. The returned value is directly used even if it is not a numeric value. But no information will be appended in following cases. 1) when 'count_result' method returns nil 2) when 'count_result' method is not defined in current adapter Note ==== 'count_result' method should be defined as 'protected' or 'public' because we check whether it is implemented or not in current adapter by using 'respond_to?' method. Supported Databases =================== Currently these databases are supported. * PostgreSQL * MySQL For Other Databases =================== Put a new adapter file that contains 'count_result' method for your database adapter into adatpers directory. Copyright (c) 2008 maiha@wota.jp, released under the MIT license
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