MySQLi - Select DB

语法

bool mysqli_select_db ( mysqli $link , string $dbname )

定义和用法

用于选择数据库查询的默认数据库。

示例

试试下面的例子 −

<?php
   $servername = "localhost:3306";
   $username = "root";
   $password = "";
   $dbname = "TUTORIALS";
   $tmp = NULL;
   $conn = new mysqli($servername, $username, $password, $dbname);

   if (!$conn->real_connect($servername, $username, $password, $dbname)) {
      die('Connect Error (' . mysqli_connect_errno() . ') '. mysqli_connect_error());
   }
   echo 'Success... ' . mysqli_get_host_info($conn) . "
";

   if ($result = $conn->query("SELECT DATABASE()")) {
      $row = $result->fetch_row();
      printf("Default database is %s.
", $row[0]);
      $result->close();
   }
   $conn->select_db("test");

   if ($result = $conn->query("SELECT DATABASE()")) {
      $row = $result->fetch_row();
      printf("Default database is %s.
", $row[0]);
      $result->close();
   }
   $conn->close();
?>

上述代码的示例输出应该是这样的 −

Success... localhost:3306 via TCP/IP Default database is tutorials.
Default database is test.

mysqli_useful_functions.html