闲者博客 - 连接
https://bk1314.com/tag/%E8%BF%9E%E6%8E%A5/
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PHP同时连接多个mysql数据库的具体实现
https://bk1314.com/31.html
2022-02-24T09:57:30+08:00
方法一<?php
$conn1 = mysql_connect("127.0.0.1", "root","root","db1");
mysql_select_db("Huju", $conn1);
$conn2 = mysql_connect("127.0.0.1", "root","root","db2");
mysql_select_db("yun", $conn2);
$sql = "select * from user";
$query = mysql_query($sql,$conn1); //添加连接$conn1
if($row = mysql_fetch_array($query))
echo $row[0]."\n";
$sql = "select * from url ";
$query = mysql_query($sql, $conn2);
if($row = mysql_fetch_array($query))
echo $row[0];
?>方法二:在sql语句中关联所用数据库，此时可以省略mysql_query的第二个参数<?php
$conn1 = mysql_connect("127.0.0.1", "root","root","db1");
mysql_select_db("db1", $conn1);
$conn2 = mysql_connect("127.0.0.1", "root","root","db2");
mysql_select_db("db2", $conn2);
$sql = "select * from db1.user"; //关联数据库
$query = mysql_query($sql);
if($row = mysql_fetch_array($query))
echo $row[0]."\n";
$sql = "select * from db2.url ";
$query = mysql_query($sql);
if($row = mysql_fetch_array($query))
echo $row[0];
?>