MySQL: Querying and Using Form Data
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1 MySQL: Querying and Using Form Data CISC 282 November 15, 2017 Preparing Data $mysqli >real_escape_string($datavalue); Requires a $mysqli object Functional version mysqli_real_escape_string( ) does not Escapes (manages) MySQL special characters e.g., \n, ', " Returns the prepared string Does not prevent injection attacks We'll see how to do that shortly 2
2 Introduction to Querying Must query the database using MySQLi to get data MySQLi returns a mysqli_result object The object can access the data in several forms Data is typically fetched one row at a time Ask repeatedly until no more rows remain Enumerate through the data Why is this method used? Query results may contain millions of entries Far too large to store in a single data structure 3 Some mysqli_result Methods Function fetch_assoc() fetch_row() fetch_array( $resulttype = MYSQLI_BOTH) fetch_object() free() or close() Return Value An associative array containing a row's value(s) An array with numeric indicies containing a row's value(s) An associative array, an array with numeric indicies, or a combination of both, containing a row's value(s) An object with properties named after a row's attribute(s) and containing a row's value(s) Frees the memory used for the mysqli_result object once all the rows have been fetched 4
3 Query Basics if ($result = $mysqli >query("mysqlquery")) { while ($row = $result >fetch_type()) {... $result >free(); MySQLQuery is formatted like any other query on the MySQL command line Returns a mysqli_result object if there was no error Returns FALSE otherwise 5 Query Basics if ($result = $mysqli >query("mysqlquery")) { while ($row = $result >fetch_type()) {... $result >free(); Double-quotes are generally used for MySQLQuery Provide interpreted strings e.g., "SELECT $attr1, $attr2 FROM $tablename;" Naturally allows single-quotes around string values e.g., "SELECT * FROM shows WHERE name LIKE '$var';" 6
4 Prepared Statements A different approach to executing queries Create a query with the basic structure e.g., keywords, constants Prepare the statement for execution Bind the values in the query to variables e.g., form data Execute the statement Bind the results from the query to variables Alternative to fetching data in arrays 7 Prepared Statements Why use this approach instead of query? Can easily execute same query with different values e.g., inserting multiple rows into the same table Maintains data types Using query requires and returns strings Binding keeps the type Especially useful for return values Prevents MySQL injection attacks the query function simply executes its argument Could include something malicious Preparing executes one statement with specific values 8
5 Using Prepared Statements $resultvarname = NULL; if ($stmt = $mysqli >prepare("select attr1, FROM tablename WHERE predattr=?")) { $stmt >bind_param("s", $predattrvarname); $stmt >execute(); $stmt >bind_result($attr1varname); while ($stmt >fetch()) { $stmt >close(); 9 prepare if ($stmt = $mysqli >prepare("select attr1, FROM tablename WHERE predattr=?")) Argument is a statement including question marks These will be replaced later on Return value is a mysqli_stmt object FALSE if there was an error Check $mysqli >errno and $mysqli >error 10
6 bind_param $stmt >bind_param("type1 ", $predattrvarname, ); First argument is a string list of types s for strings, i for integers, etc. Lists the types of the values in the rest of the arguments Remaining arguments are variables containing values These are bound to the?s in the statement in order Return value is TRUE if successful FALSE if there was an error Check $stmt >errno and $stmt >error 11 execute and bind_result $stmt >execute(); $stmt >bind_result($attr1varname,...); execute returns TRUE/FALSE if success/failure bind_result arguments are variables to contain values These are bound to the attributes in the statement in order bind_result returns TRUE/FALSE if success/failure 12
7 fetch and close while ($stmt >fetch()) { $stmt >close(); fetch sets the values for the bound result variables Returns TRUE if successful, FALSE on error and NULL if no data remains close returns TRUE/FALSE if success/failure 13
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