我已经为我的数据库服务器完成了主从设置，所以在我的 codigniter 应用程序中，我想要的是在主服务器上执行所有写入选项，并在从服务器上执行所有读取操作。
谁能告诉我如何在 codigniter version3 中实现这一点。
谢谢。
最佳答案
你必须更新系统/数据库/DB_Driver.php 文件。
您必须在此文件中进行 3 处小更改，这非常简单。
1) Inside Construction 添加您的读写服务器凭据。
$this->server_details['local_server']['hostname'] = "localhost";
$this->server_details['local_server']['username'] = "select_user";
$this->server_details['local_server']['password'] = "password";
$this->server_details['live_server']['hostname'] = "192.192.223.22";
$this->server_details['live_server']['username'] = "write_user";
$this->server_details['live_server']['password'] = "password";
2) Create New 函数将切换数据库连接以进行选择和写入查询。
private function ebrandz_switch_db_for_read_write($sql) {
if( $this->hostname == $this->server_details['local_server']['hostname'] && $this->username == $this->server_details['local_server']['username'] && $this->password == $this->server_details['local_server']['password'] ) {
//echo $sql.'<br/>';
if(stristr($sql, 'SELECT')) {
foreach($this->server_details['local_server'] as $index_key => $index_value ) {
$this->$index_key = $index_value;
}
$this->conn_id = null; //unset resource link
$this->initialize(); //Reinitialize connnection with new parameters
} else {
//die('write operation is not allowed.');
foreach($this->server_details['live_server'] as $index_key => $index_value ) {
$this->$index_key = $index_value;
}
$this->conn_id = null ; //unset resource link
$this->initialize(); //Reinitialize connnection with new parameters
}
} else if( $this->hostname == $this->server_details['live_server']['hostname'] && $this->username == $this->server_details['live_server']['username'] && $this->password == $this->server_details['live_server']['password'] ) {
if(stristr($sql, 'SELECT')) {
foreach($this->server_details['local_server'] as $index_key => $index_value ) {
$this->$index_key = $index_value;
}
$this->conn_id = null ; //unset resource link
$this->initialize(); //Reinitialize connnection with new parameters
} else {
//die('write operation is not allowed.');
foreach($this->server_details['live_server'] as $index_key => $index_value ) {
$this->$index_key = $index_value;
}
$this->conn_id = null ; //unset resource link
$this->initialize(); //Reinitialize connnection with new parameters
}
}
//Code to re initialize the connection
}
3) 在该文件的查询函数中，您必须调用之前定义的函数。
// Verify table prefix and replace if necessary
if ($this->dbprefix !== '' && $this->swap_pre !== '' && $this->dbprefix !== $this->swap_pre)
{
$sql = preg_replace('/(\W)'.$this->swap_pre.'(\S+?)/', '\\1'.$this->dbprefix.'\\2', $sql);
}
/**
* @author Anant Waykar
* if query is read only then load some other database
*/
$this->ebrandz_switch_db_for_read_write($sql);
//Code to re initialize the connection
关于php - 在 codeigniter 中切换数据库服务器以进行读取和写入操作。，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/43202811/