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$result->fields['name'] "\n"; $result->MoveNext(); } } else { echo "No records found!"; } // close connection $dbh->Close(); >
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If you re curious about the SQL command(s) to limit record ranges in your RDBMS, you ll find it instructive to look at the source code for the SelectLimit() function in the ADOdb driver for your RDBMS
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913 Using Prepared Statements
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Use a prepared statement with the PDO extension:
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< php // define data array $data = array( "10" => "tomatoes", "11" => "potatoes", "12" => "carrots", "13" => "onions", "14" => "beans" ); // attempt a connection try { $pdo = new PDO('mysql:dbname=db1;host=localhost', 'user', 'pass');
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} catch (PDOException $e) { die("ERROR: Cannot connect: " $e->getMessage()); } // create prepared statement $sql = "INSERT INTO products (id, name) VALUES ( , )"; $stmt = $pdo->prepare($sql) or die("ERROR: " implode(":", $pdo->errorInfo())); // bind parameters to statement $stmt->bindParam(1, $id); $stmt->bindParam(2, $name); // process data array // execute prepared statement with different values // on each iteration foreach ($data as $id => $name) { $stmt->execute() or die("ERROR: " implode(":", $stmt->errorInfo())); } // display message echo "Record(s) successfully added"; // close connection unset($pdo); >
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In the event that you need to execute a particular query multiple times with different values for example, a series of INSERT statements it s a good idea to use a prepared statement to save time and overhead A prepared statement is like a regular SQL statement, except that it contains placeholders for variable data; these placeholders are replaced with actual values each time the statement is executed With PDO, a prepared statement is created by passing PDO s prepare() method a SQL statement containing query placeholders, as in the previous listing These placeholders can then be bound to variables with the statement object s bindParam() method (which must be called for each placeholder), and the statement can then executed with the object s execute() method In the previous listing, the data for the query comes from a predefined array, and a loop is used to repeatedly execute the prepared statement, assigning the placeholders new values from the array on each iteration
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If you re using MySQL, a prepared statement is created with the mysqli_ prepare() function, which returns a statement handle Parameters are bound to the variable placeholders in the statement with the mysqli_stmt_bind_param() function, which accepts as arguments the statement handle, a string indicating the data types of the various variable placeholders (s for string, i for integer, d for double-precision number), and variables representing each of the placeholders The mysqli_stmt_execute() function then executes the prepared query, iterating over the list of values and assigning them to the variable placeholders in a loop This process is clearly illustrated in the next listing:
< php // define data array $data = array( "10" => "tomatoes", "11" => "potatoes", "12" => "carrots", "13" => "onions", "14" => "beans" ); // open connection $connection = mysqli_connect('localhost', 'user', 'pass', 'db1') or die ("ERROR: Cannot connect"); // create prepared statement $sql = "INSERT INTO products (id, name) VALUES ( , )"; $stmt = mysqli_prepare($connection, $sql) or die("ERROR: " mysqli_error($connection)); // bind parameters to statement mysqli_stmt_bind_param($stmt, 'is', $id, $name); // process data array // execute prepared statement with different values // on each iteration foreach ($data as $id => $name) { mysqli_stmt_execute($stmt) or die("ERROR: " mysqli_stmt_error($stmt)); } // close statement mysqli_stmt_close($stmt);
9: Working with Databases
// close connection mysqli_close($connection); // display message echo "Record(s) successfully added"; >
Using a prepared statement can provide performance benefits when you have a single query to be executed a large number of times with different values, as only the variable data is transmitted to the server each time, not the complete query However, this benefit is only available if the database system supports prepared queries (MySQL, InterBase, and Oracle do, just to name a few); in all other cases, only simulated functionality is available and prepare() becomes equivalent to a simple exec(), with no inherent performance gain
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