Php and mysql missing manual

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PHP5 and MySQL Bible Bible

$db_selected) $q = "update `table` set `LOCK`='F' where `ID`='1'";$lock = mysql_affected_rows(); If we assume NOT LOCKED = "" (empty string) LOCKED = 'F'then if the column LOCK had a value other than F (normally should be an empty string) the update statement sets it to F and set the affected rows to 1. If affected rows return 0 then the value of that column was already F and somebody else has the lock.

QuickBooks 2014 The Missing Manual

The secret lies in the following statement taken from the mysql manual:"If you set a column to the value it currently has, My SQL notices this and does not update it."Of course all this is possible if the all application processes agree on the locking algorithm.

QuickBooks 2014 The <em>Missing</em> <em>Manual</em>

PHP mysql_query - Manual

Mysql_query doesnt support multiple queries, a way round this is to use innodb and transactionsthis db class/function will accept an array of arrays of querys, it will auto check every line for affected rows in db, if one is 0 it will rollback and return false, else it will commit and return true, the to the function is simple and is easy to read etc----------class My SQLDB;/* Create database connection object */$database = new My SQLDB;// then from anywhere else simply put the transaction queries in an array or arrays like this: function function() here's a script for parsing a *file (tested only on dumps created with php My Admin) which is short and simple (why do people say "here's a short and simple script" and it has a 100 lines? the script skips comments and allows ; to be present within the querys Keep in mind when dealing with PHP & My SQL that sending a null-terminated string to a My SQL query can be misleading if you use echo($sql) in PHP because the null terminator may not be visible.

Learning Resources Codoki

For example (this assumes connection is already made),$string1 = "mystring\0";$string2 = "mystring";$query1 = "SELECT * FROM table WHERE mystring='".$string1."'"$query2 = "SELECT * FROM table WHERE mystring='".$string2."'" $result1 = mysql_query($query1);$result2 = mysql_query($query2);//$result1 IS NOT EQUAL TO $result2 but will not provide an error//but printing these queries to the screen will provide the same resultecho($result1);echo($result2); Not knowing this could lead to some mind-numbing troubleshooting when dealing with any strings with a null terminator. :) If, like me, you come from perl, you may not like having to use sprintf to 'simulate' placeholders that the DBI package from perl provides.


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