我已经为我的数据库服务器完成了主从设置，所以在我的 codgniter 应用程序中，我想要的是在主服务器上执行所有写选项和在从服务器上执行所有读取操作。
谁能告诉我如何在 codgniter version3 中实现这一点。
谢谢。
你必须更新 system/database/DB_Driver.php 文件。
您必须在此文件中进行 3 个小的更改，这非常简单。
1) 在内部构造中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
$this->initialize(); //Reinitialize connnection with new parameters
}
}
//Code to re initialize the connection
}
3) 在这个文件的 Query 函数中，你必须调用之前定义的函数。
// Verify table prefix and replace if necessary
if ($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
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我来说两句