- Php mysql download file from url to database update#
- Php mysql download file from url to database manual#
- Php mysql download file from url to database archive#
$EnumValues = substr($EnumValues, 6, strlen($EnumValues)-8) $dbSQL = "SHOW COLUMNS FROM ".$Table." LIKE '".$Column."'" The function below (presumes db connection) will return an array of the possible values of an enum.
Php mysql download file from url to database manual#
Regarding the idea for returning all possible values of an enum field, the mySQL manual says that "SHOW COLUMNS FROM table LIKE column" should be used to do this. then from anywhere else simply put the transaction queries in an array or arrays like this:Īrray("query" => "UPDATE table WHERE something = 'something'"),Īrray("query" => "UPDATE table WHERE something_else = 'something_else'"),Īrray("query" => "DELETE FROM table WHERE something_else2 = 'something_else2'"), $result = mysql_query($qa, $this->connection) Return mysql_query("ROLLBACK", $this->connection) Return mysql_query("COMMIT", $this->connection) Return mysql_query("BEGIN", $this->connection) $null = mysql_query("START TRANSACTION", $this->connection) Mysql_select_db(DB_NAME, $this->connection) or die(mysql_error()) $this->connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS) or die(mysql_error()) Private $connection // The MySQL database connection This 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 call to the function is simple and is easy to read etc Mysql_query doesnt support multiple queries, a way round this is to use innodb and transactions Of course all this is possible if the all application processes agree on the locking algorithm.
Php mysql download file from url to database update#
"If you set a column to the value it currently has, MySQL notices this and does not update it." The secret lies in the following statement taken from the mysql manual: If affected rows return 0 then the value of that column was already F and somebody else has the lock. 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. $db_selected = mysql_select_db('foo', $link) ĭie ('Can\'t use foo : '. $link = mysql_connect('localhost', 'user', 'pass')
Simulating an atomic operation for application locks using mysql.
Php mysql download file from url to database archive#
Getting Started Introduction A simple tutorial Language Reference Basic syntax Types Variables Constants Expressions Operators Control Structures Functions Classes and Objects Namespaces Enumerations Errors Exceptions Fibers Generators Attributes References Explained Predefined Variables Predefined Exceptions Predefined Interfaces and Classes Context options and parameters Supported Protocols and Wrappers Security Introduction General considerations Installed as CGI binary Installed as an Apache module Session Security Filesystem Security Database Security Error Reporting User Submitted Data Hiding PHP Keeping Current Features HTTP authentication with PHP Cookies Sessions Dealing with XForms Handling file uploads Using remote files Connection handling Persistent Database Connections Command line usage Garbage Collection DTrace Dynamic Tracing Function Reference Affecting PHP's Behaviour Audio Formats Manipulation Authentication Services Command Line Specific Extensions Compression and Archive Extensions Cryptography Extensions Database Extensions Date and Time Related Extensions File System Related Extensions Human Language and Character Encoding Support Image Processing and Generation Mail Related Extensions Mathematical Extensions Non-Text MIME Output Process Control Extensions Other Basic Extensions Other Services Search Engine Extensions Server Specific Extensions Session Extensions Text Processing Variable and Type Related Extensions Web Services Windows Only Extensions XML Manipulation GUI Extensions Keyboard Shortcuts ? This help j Next menu item k Previous menu item g p Previous man page g n Next man page G Scroll to bottom g g Scroll to top g h Goto homepage g s Goto search
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