1. 一般的insert

$query = "INSERT INTO Profile (userName) VALUES ('{$userName}')";

$this->db->query($query);

$userId = sprintf("%d", $this->db->insert_id);

$this->db->commit();

2. 数据库中如果有，则更新，没有则插入

$query = "INSERT INTO BookRead (userId, bookId, count) VALUES ($_userId, $_bookId, 1) ON DUPLICATE KEY UPDATE count = count + 1";

$this->db->query($query);

$this->db->commit();

3. 更新

$query = "UPDATE Profile Set deviceToken='{$_token}' WHERE userId=$_userId";

$this->db->query($query);

$this->db->commit();

4.查询1，操作需要操作的字段

$stmt = $this->db->prepare('SELECT userId, passWord FROM Profile WHERE userName=?');

$stmt->bind_param("s", $_userName);

$rs = $stmt->execute();

$stmt->bind_result($_userId, $_passWord);

while ($stmt->fetch()) {

break;

}

$stmt->close();

查询2，返回查询结果数组

$query = "SELECT name, points FROM Profile WHERE 1 ORDER BY points DESC LIMIT $_from, $_to";

if ($result = $this->db->query($query)) {

while ($row = $result->fetch_row()) {

$ret = array (

"name" => $row[0],

"points" => $row[1],

);

}

$result->close();

}