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Tags: mysql
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How to use events to schedule database actions in MySQL
By paulduboisIf you want to set up a database operation that runs periodically without user intervention, create an event that executes according to a schedule.As of MySQL 5.1, one of the capabilities...
14 September 2009 - 10:49 AM | 0 Comments
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How to use a trigger to log changes to a table in MySQL
By paulduboisIf you have a table that maintains current values of items that you track (such as auctions being bid on), but you’d also like to maintain a journal (or history) of changes to...
14 September 2009 - 10:10 AM | 0 Comments
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How to use a trigger to define dynamic default column values in MySQL
By paulduboisIf a column in a table needs to be initialized to a nonconstant value, but MySQL allows only constant default values, use a BEFORE INSERT trigger. This e...
14 September 2009 - 09:46 AM | 0 Comments
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How to create compound-statement objects in MySQL
By paulduboisIf you want to define a stored routine, a trigger, or an event, but its body contains instances of the ; statement terminator, redefine the mysql statement terminator w...
14 September 2009 - 09:10 AM | 0 Comments
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How to use sequence generators as counters in MySQL
By paulduboisIf you’re interested only in counting events, use a sequence-generation mechanism that uses just one row per counter.AUTO_INCREMENTcolumns are useful for generating sequences across a ...
11 September 2009 - 06:04 PM | 0 Comments
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How to use the SQL mode to control bad input data handling in MySQL
By paulduboisBy default, MySQL is forgiving about accepting data values that are invalid, out of range, or otherwise unsuitable for the data types of the columns into which you insert them. (...
11 September 2009 - 05:45 PM | 0 Comments
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How to determine whether a statement produced a result set in MySQL
By paulduboisIf you just executed an SQL statement, but you’re not sure whether it produced a result set, check the column count in the metadata. If the count is zero, there is no result ...
11 September 2009 - 05:27 PM | 0 Comments
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