php中数据库的相关操作

连接数据库

<?php
//链接数据库
     $conn=mysqli_connect("localhost","root","","toupiao") or die("数据库服务器连接错误".mysql_error());
	 mysqli_query($conn,"set names utf8");
?>

执行查询、插入、删除等操作

$result = mysqli_query($conn,$sql);

查询语句的两种不同写法

$query = mysqli_query($conn, "select * from social_message where address='{$address}'");

$query = mysqli_query($conn,"select * from school_message where school_name='".$school."'");

将查询结果放入数组中

$contents = array();
while($str = mysqli_fetch_array($result1))
{
	$contents[] = $str;
}

查看数据库执行后影响数据库的行数

//查看数据库执行后影响数据库的行数
	$num=mysqli_affected_rows($conn);
    if($num>=1){
        echo 1;
    }else{
        echo mysqli_error($conn);
    }