mysqli一些常用方法的使用

1.die()函数：表示向用户输出引号中的内容后，程序终止运行，提示定制的出错信息

ex:

$conn = mysqli_connect("localhost", "root", "","zhym_02") or die("连接数据库服务器失败！".mysqli_error());



2.mysqli_connnect()函数：连接MySQL服务器

ex: $conn = mysqli_connect(“localhost”,”root”,””);

$conn = mysql_select_db($conn, “zhym_01”);

或

$conn = mysqli_connect("localhost", "root", "","zhym_02");



3.mysqli_select_db()函数：选择MySQL数据库

ex:

$select = mysqli_select_db($conn, "zhym_01");



4.mysqli_query()函数：执行SQL语句，设置编码格式

ex:

mysqli_query($conn, "set names gb2312"); //设置编码格式

$result = mysqli_query($conn, "select * from tb_user");



5.mysqli_fetch_array()函数：从结果集中获取一行作为枚举数组

ex: $result = mysqli_fetch_array($arr,MYSQL_ASSOC)

6.mysqli_num_rows()函数：获取查询结果集中的记录数

ex:

while ($row=mysqli_fetch_row($result))

{

printf ("%s (%s)n",$row[0],$row[1]);

}

7.mysqli_free_result()函数：释放内存

ex: mysqli_free_result($result);