Location: PHPKode > scripts > PHP DB Script > db.help.txt
<?
// This file is an help and shouldn't be executed.
// You can however activate syntaxical coloration for a better read.
die();

/************************** Before Everything Else: *************************/

// Include the class:
include("db.class.php");

// Open the base (construct the object):
$db = new DB($base, $server, $user, $pass);

/************************** Basic Queries: **********************************/

// Do a query (return the same as mysql_query):
$result = $db->query("SELECT * FROM People");
$result = $db->query("SELECT * FROM People", true); // With DEBUG

// Browse results of a query (return a line as an object):
while ($line = $db->fetchNextObject($result)) {}
while ($line = $db->fetchNextObject()) {} // From the LAST query

// Commonly, you can copy/paste this code for one query at a time:
$db->query("SELECT * FROM People");
while ($line = $db->fetchNextObject()) {
  use($line->aField);
}

// But for sub-queries you should store the result of the first queries:
$result = $db->query("SELECT * FROM Towns");
while ($line = $db->fetchNextObject($result)) {
  $db->query("SELECT * FROM People WHERE town='{$line->name}'");
  while ($line2 = $db->fetchNextObject()) {
    use($line->aField, $line2->anotherField);
  }
}

// If you have a query that doesn't return any result such as INSERT, UPDATE, DELETE... use this:
$db->execute("UPDATE People SET name=name");

/************************** Convenient Query Functions: *********************/

// Do a query and return the unique resulting object from it (or NULL if there is no result):
// Equivalent to a call to query() and then to fetchNextObject().
$line = $db->queryUniqueObject("SELECT * FROM People WHERE id=2");
$line = $db->queryUniqueObject("SELECT * FROM People WHERE id=2", true); // With DEBUG

// Do a query and return the unique resulting cell from it (or NULL if there is no result):
// Equivalent to a call to query() and then to fetchNextObject() and then a fetching of the first cell.
$age = $db->queryUniqueValue("SELECT age FROM People WHERE id=2");

// Return the maximum of a column in a table, with a condition WHERE:
// Example: "SELECT MAX(age) FROM People WHERE town='Paris'" is simply:
$max = $db->maxOf("age", "People", "town='Paris'");

// If there is no condition, it's simply:
$max = $db->maxOfAll("age", "People");

// Return the number of lines in a table, with a condition WHERE:
// Example: "SELECT COUNT(*) FROM People WHERE town='Paris'" is just:
$count = $db->countOf("People", "town='Paris'");

// If there is no condition, it's just:
$count = $db->countOfAll("People");

// All query...() methods can take a second boolean parameter to debug it or not.
// All those convenient methods can be imbriqued: the query is not saved.

/************************** Other Functions: ********************************/

// Get the id of the last inserted line:
$lastId = $db->lastInsertedId();

// The execution time of the script (from "new DB();"):
$time = $db->getExecTime();

// The number of executed queries (from "new DB();"):
$queriesCount = $db->getQueriesCount();

/************************** Useless Functions: ******************************/

// Number of lines of a result (return an integer):
$numLines = $db->numRows($result);
$numLines = $db->numRows(); // From the LAST query

// Go back to the first line in a fetch:
$db->resetFetch($result);

// Close the connexion to the base:
$db->close();

?>
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