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I've found this invaluable when trying to tie down large amounts of updates to a table, using this you can easily see where a query was successfully executed and the number of rows are affected, or where there are problems and a statement has failed for example.Example output: [0.072][1][80]: UPDATE MYTABLE SET FIELD = 1; [0.106][1][758]: UPDATE ANOTHERTABLE SET FIELD = 2; [0.006][-1][0]: UPDATER ANOTHERTABLE SET FIELD = 2; The output shows: [Timetaken][result[lines affected] The result will be either -1, 0 or 1, -1 means there's a problem with the sql statement, 1 means it executed correctly, 0 means it wasn't executed.We have used a table called 'item' to apply the query: Table Name : item Structure : item_code varchar(20), value int(11), quantity int(11) where item_code is the primary key.In the following rows of item table, 'value' column which is marked with red rectangle will be updated.PROBLEMYou notice that the second query is not failing as you had expected even though the record being inserted is an exact duplicate of a record previously inserted.CAUSEWhen the first query (the REPLACE query) deletes a record from t1 in the first stage of the REPLACE operation, it cascades the delete to the record that would be duplicated in t2.The following My SQL statement will update purch_price with purch_price multiplied by 5 if it satisfies the condition defined in the subquery started with SELECT wrapped within a pair of parenthesis.

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I've found this invaluable when trying to tie down large amounts of updates to a table, using this you can easily see where a query was successfully executed and the number of rows are affected, or where there are problems and a statement has failed for example.

Example output: [0.072][1][80]: UPDATE MYTABLE SET FIELD = 1; [0.106][1][758]: UPDATE ANOTHERTABLE SET FIELD = 2; [0.006][-1][0]: UPDATER ANOTHERTABLE SET FIELD = 2; The output shows: [Timetaken][result]][lines affected] The result will be either -1, 0 or 1, -1 means there's a problem with the sql statement, 1 means it executed correctly, 0 means it wasn't executed.

We have used a table called 'item' to apply the query: Table Name : item Structure : item_code varchar(20), value int(11), quantity int(11) where item_code is the primary key.

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So if you use one SQL request to insert several rows at a time, and some are inserted, some are just updated, you won't get the real count.This function returns the number of deleted records plus the number of inserted records. ON DUPLICATE KEY UPDATE" queries, the return value will be I was just testing "INSERT INTO ...ON DUPLICATE KEY UPDATE" syntax, on PHP 5.3.29 and mysql_affected_rows() was returning either 2 for updated row, 1 for inserted new row, and also 0, which was not documented, evidently when nothing was inserted. I see that when try to use mysql_affected_rows() with "mysql_pconnect(...)" without link indetifier as param in "mysql_affected_rows()" the result is allways -1.Updating My SQL Table using PHP Script You can update My SQL table data (using UPDATE command) through a PHP script.Within the script, PHP function My SQL_query() execute the SQL command.




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