版本支持:
PHP > 5.0
MySQL > 4.0
2.
连接数据库:
$db = new mysqli(host,user,password,database);
这是对象导向的连接方法,还有一种过程导向的连接方法。前者返回一个对象,后者返回一个资源。
$db = mysqli_connect(host,user,password,database);
3.
连接出错函数:
mysqli_connect_error();
如果连接出错,该函数返回一个错误号,否则返回0;
4.
选择数据库:
$db->select_db(dbname);
or
mysqli_select_db(db_resource,db_name);
5.
执行查询
$result = $db->query($query);
or
$result = mysqli_query($db,$query);
6.
返回结果的行数:
$num_results = $result->num_rows;
or
$num_results = mysqli_num_rows($result);
7.
取出每一行的结果(返回关系型数组):
$row = $result->fetch_assoc();
or
$row = mysqli_fetch_assoc($result);
8.
取出每一行的结果(返回计数型数组):
$row = $result->fetch_row($result);
or
$row = mysqli_fetch_row($result);
9.
取出每一行的结果(返回一个对象):
$row = $result->fetch_object();
or
$row = mysqli_fetch_object($result);
10.
释放查询结果:
$result->free();
or
mysqli_free_result($result);
11.
关闭数据库连接:
$db->close();
or
mysqli_close($db);
12.
一条查询所影响的行数:
$db->affected_rows;
or
mysqli_affected_rows($result);
13.
模式化SQL语句执行:
$query = “insert into books values(?, ?, ?, ?)”;
$stmt = $db->prepare($query); $stmt->bind_param(“sssd”, $isbn, $author, $title, $price); $stmt->execute(); echo $stmt->affected_rows.’ book inserted into database.’; $stmt->close(); 在过程化执行方式中,
$db->prepare()对应mysqli_stmt_prepare()函数;
(责任编辑:admin)$stmt->bind_param()对应mysqli_stmt_bind_param()函数; $stmt->execute() 对应mysqli_stmt_execute()函数; |