codeigniter 如何根据动态值连接第二个数据库

Question

我想通过动态连接从其他数据库导入数据

在 codeigniter 中，用户在表单中输入数据库凭据，然后我想连接该数据库并在主数据库中导入一些数据。问题是如何使用动态值设置第二个数据库连接。

Answer 1

这是您的 第一个数据库连接 来自 application/config/database。php

$db['default'] = array(
    'dsn'   => '',
    'hostname' => 'localhost',
    'username' => 'root',
    'password' => '',
    'database' => 'first_db',
    'dbdriver' => 'mysqli',
    'dbprefix' => '',
    'pconnect' => FALSE,
    'db_debug' => (ENVIRONMENT !== 'production'),
    'cache_on' => FALSE,
    'cachedir' => '',
    'char_set' => 'utf8',
    'dbcollat' => 'utf8_general_ci',
    'swap_pre' => '',
    'encrypt' => FALSE,
    'compress' => FALSE,
    'stricton' => FALSE,
    'failover' => array(),
    'save_queries' => TRUE
);

这是您选择的模型或控制器或助手的第二个数据库连接函数。

private function second_db(){
    return $db['second'] = array(
        'dsn'   => '',
        'hostname' => 'localhost',
        'username' => 'root',
        'password' => '',
        'database' => 'second_db',
        'dbdriver' => 'mysqli',
        'dbprefix' => '',
        'pconnect' => FALSE,
        'db_debug' => (ENVIRONMENT !== 'production'),
        'cache_on' => FALSE,
        'cachedir' => '',
        'char_set' => 'utf8',
        'dbcollat' => 'utf8_general_ci',
        'swap_pre' => '',
        'encrypt' => FALSE,
        'compress' => FALSE,
        'stricton' => FALSE,
        'failover' => array(),
        'save_queries' => TRUE
    );
}
private function first_db(){
        return $db['second'] = array(
            'dsn'   => '',
            'hostname' => 'localhost',
            'username' => 'root',
            'password' => '',
            'database' => 'first_db',
            'dbdriver' => 'mysqli',
            'dbprefix' => '',
            'pconnect' => FALSE,
            'db_debug' => (ENVIRONMENT !== 'production'),
            'cache_on' => FALSE,
            'cachedir' => '',
            'char_set' => 'utf8',
            'dbcollat' => 'utf8_general_ci',
            'swap_pre' => '',
            'encrypt' => FALSE,
            'compress' => FALSE,
            'stricton' => FALSE,
            'failover' => array(),
            'save_queries' => TRUE
        );
    }

如果您进行了设置，则可以使用此代码切换数据库

$this->load->database(first_db(), TRUE);
$this->load->database(second_db(), TRUE);

codeigniter 如何根据动态值连接第二个数据库

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