php 操作mysql数据库的简单示例

php操作mysql的简单范例，感兴趣的小伙伴，下面一起跟随编程之家 jb51.cc的小编来看看吧。
经测试代码如下：

/**
 * 操作mysql
 *
 * @param 
 * @arrange (编程之家) jb51.cc
 **/
 
// connect to the database
$con = mysql_connect('localhost','testuser','testpassword') 
    or die('Could not connect to the server!');
 
// select a database:
mysql_select_db('testdb') 
    or die('Could not select a database.');
 
 
/*
** Fetch some rows from database:
*/
 
// read username from URL
$username = $_GET['username'];
 
// escape bad chars:
$username = mysql_real_escape_string($username);
 
// build query:
$sql = SELECT id,timestamp,text FROM logs WHERE username = '$username';
 
// execute query:
$result = mysql_query($sql) 
    or die('A error occured: ' . mysql_error());
 
// get result count:
$count = mysql_num_rows($result);
print Showing $count rows:<hr/>;
 
// fetch results:
while ($row = mysql_fetch_assoc($result)) {
    $row_id = $row['id'];
    $row_text = $row['text'];
 
    print #$row_id: $row_text<br/>\n;
}
 
 
/*
** Do a insert query:
*/
 
// create SQL query:
$sql = INSERT INTO logs (timestamp,text) VALUES (NOW(),'some text here!');
 
// execute query:
$result = mysql_query($sql) or die('A error occured: ' . mysql_error());
 
// get the new ID of the last insert command
$new_id = mysql_insert_id();
 
 
 
/*
** Do a update query:
*/
 
// create SQL query:
$sql = UPDATE logs SET text='New text!' WHERE id='1';
 
// execute query:
$result = mysql_query($sql) or die('A error occured: ' . mysql_error());
 
 
 
/*
** Do a delete query:
*/
 
// create SQL query:
$sql = DELETE FROM logs WHERE id='1';
 
// execute query:
$result = mysql_query($sql) or die('A error occured: ' . mysql_error());
 
 
 
// Have fun!


/***   代码来自编程之家 jb51.cc（jb51.cc）   ***/