我用mysqli连接远程mysql db。我没有得到任何连接错误,但是当我输入测试查询时,我在控制台中的$ response变量只显示五行空格。这是我的连接代码:
ini_set ('error_reporting', E_ALL);
ini_set ('display_errors', '1');
error_reporting (E_ALL|E_STRICT);
$connection = mysqli_init();
mysqli_options ($connection, MYSQLI_CLIENT_SSL_VERIFY_SERVER_CERT, true);
mysqli_ssl_set($connection,'/usr/local/certs/client-key.pem',
'/usr/local/certs/client-cert.pem', '/usr/local/certs/server-ca.pem', NULL, NULL);
$link = mysqli_real_connect ($connection, $db['host'],
$db['user'],$db['password'], $db['dbName'], 3306, NULL,MYSQLI_CLIENT_SSL_DONT_VERIFY_SERVER_CERT);
if (!$link)
{
die ('Connect error (' . mysqli_connect_errno() . '): ' . mysqli_connect_error() . "\n");
}
else
{
$this->output->writeln($link); // this returns '1'
$response = $connection->query('SHOW TABLES;');
$this->output->writeln($response); // here I get blank lines
// even if tables exist within database
$connection->close();
}
注意:由于mysql远程服务器使用谷歌云,因为SSL证书,我遇到了一些连接问题。所以我发现我需要放置MYSQLI_CLIENT_SSL_DONT_VERIFY_SERVER_CERT标志以避免出现问题。这可能是一个重要问题。
在执行查询的所有情况下,都不会返回该查询的结果。查询是否成功只返回一个句柄,用于去获取该查询的结果。
所以你需要添加一些mysqli_fetch来获取结果集的每一行一次。见修改后的代码
在这种情况下,因为SHOW TABLES的结果有点不寻常,我使用fetch_array(MYSQLI_NUM)
来处理结果更容易,但通常你更有可能使用fetch_assoc()
或fetch_object()
<?php
ini_set ('error_reporting', E_ALL);
ini_set ('display_errors', '1');
error_reporting (E_ALL|E_STRICT);
$connection = mysqli_init();
mysqli_options ($connection, MYSQLI_CLIENT_SSL_VERIFY_SERVER_CERT, true);
mysqli_ssl_set($connection,
'/usr/local/certs/client-key.pem',
'/usr/local/certs/client-cert.pem',
'/usr/local/certs/server-ca.pem',
NULL, NULL);
$link = mysqli_real_connect ($connection, $db['host'],
$db['user'],$db['password'],
$db['dbName'], 3306, NULL,
MYSQLI_CLIENT_SSL_DONT_VERIFY_SERVER_CERT);
if (!$link) {
$this->output->writeln('Connect error (' .
mysqli_connect_errno() . '): ' .
mysqli_connect_error() . "\n"
);
} else {
$this->output->writeln($link); // this returns '1'
$response = $connection->query('SHOW TABLES;');
while ( $row = $response->fetch_array(MYSQLI_NUM)) {
$this->output->writeln($row[0]);
}
$connection->close();
}