Php CodeIgniter 3.1.10:无法使用ODBC通过DSN连接到远程数据库

如上所述，我在CodeIgniter 3.1.10中使用ODBC驱动程序通过DSN连接到远程数据库时遇到问题。DSN已在ODBC数据源管理器中创建。当我想将系统从CodeIgniter 2.2.3更新到3.1.10时，出现了问题

它实际上在CodeIgniter 2.2.3上工作，代码如下：

$db['default']['hostname'] = "myDSN";
$db['default']['username'] = '';
$db['default']['password'] = '';
$db['default']['database'] = 'myDatabase';
$db['default']['dbdriver'] = 'odbc';
$db['default']['dbprefix'] = '';
$db['default']['pconnect'] = FALSE;
$db['default']['db_debug'] = TRUE;
$db['default']['cache_on'] = FALSE;
$db['default']['cachedir'] = '';
$db['default']['char_set'] = 'utf8';
$db['default']['dbcollat'] = 'utf8_general_ci';
$db['default']['swap_pre'] = '';
$db['default']['autoinit'] = TRUE;
$db['default']['stricton'] = FALSE;

$db['default'] = array(
    'dsn'   => '',
    'hostname' => 'myDSN',
    'username' => '',
    'password' => '',
    'database' => 'myDatabase',
    'dbdriver' => 'odbc',
    'dbprefix' => '',
    'pconnect' => FALSE,
    'db_debug' => TRUE,
    'cache_on' => FALSE,
    'cachedir' => '',
    'char_set' => 'utf8',
    'dbcollat' => 'utf8_general_ci',
    'swap_pre' => '',
    'encrypt' => FALSE,
    'compress' => FALSE,
    'stricton' => FALSE,
    'failover' => array(),
    'save_queries' => TRUE
);

$dbconn=odbc_connect("myDSN", "", "");

if(!$dbconn)
{
    die("Could not connect Adaptive Server Anywhere: ".odbc_errormsg(). odbc_error());
} else {
    echo "connection success";
}

但它在下面显示错误：

当前未加载数据库驱动程序

当我尝试在CodeIgniter 3.1.10上使用与以下代码相同的设置时：

$db['default']['hostname'] = "myDSN";
$db['default']['username'] = '';
$db['default']['password'] = '';
$db['default']['database'] = 'myDatabase';
$db['default']['dbdriver'] = 'odbc';
$db['default']['dbprefix'] = '';
$db['default']['pconnect'] = FALSE;
$db['default']['db_debug'] = TRUE;
$db['default']['cache_on'] = FALSE;
$db['default']['cachedir'] = '';
$db['default']['char_set'] = 'utf8';
$db['default']['dbcollat'] = 'utf8_general_ci';
$db['default']['swap_pre'] = '';
$db['default']['autoinit'] = TRUE;
$db['default']['stricton'] = FALSE;

$db['default'] = array(
    'dsn'   => '',
    'hostname' => 'myDSN',
    'username' => '',
    'password' => '',
    'database' => 'myDatabase',
    'dbdriver' => 'odbc',
    'dbprefix' => '',
    'pconnect' => FALSE,
    'db_debug' => TRUE,
    'cache_on' => FALSE,
    'cachedir' => '',
    'char_set' => 'utf8',
    'dbcollat' => 'utf8_general_ci',
    'swap_pre' => '',
    'encrypt' => FALSE,
    'compress' => FALSE,
    'stricton' => FALSE,
    'failover' => array(),
    'save_queries' => TRUE
);

$dbconn=odbc_connect("myDSN", "", "");

if(!$dbconn)
{
    die("Could not connect Adaptive Server Anywhere: ".odbc_errormsg(). odbc_error());
} else {
    echo "connection success";
}

然而，在CodeIgniter 3.1.10中，当我使用以下代码手动连接到数据库时，连接成功：

$db['default']['hostname'] = "myDSN";
$db['default']['username'] = '';
$db['default']['password'] = '';
$db['default']['database'] = 'myDatabase';
$db['default']['dbdriver'] = 'odbc';
$db['default']['dbprefix'] = '';
$db['default']['pconnect'] = FALSE;
$db['default']['db_debug'] = TRUE;
$db['default']['cache_on'] = FALSE;
$db['default']['cachedir'] = '';
$db['default']['char_set'] = 'utf8';
$db['default']['dbcollat'] = 'utf8_general_ci';
$db['default']['swap_pre'] = '';
$db['default']['autoinit'] = TRUE;
$db['default']['stricton'] = FALSE;

$db['default'] = array(
    'dsn'   => '',
    'hostname' => 'myDSN',
    'username' => '',
    'password' => '',
    'database' => 'myDatabase',
    'dbdriver' => 'odbc',
    'dbprefix' => '',
    'pconnect' => FALSE,
    'db_debug' => TRUE,
    'cache_on' => FALSE,
    'cachedir' => '',
    'char_set' => 'utf8',
    'dbcollat' => 'utf8_general_ci',
    'swap_pre' => '',
    'encrypt' => FALSE,
    'compress' => FALSE,
    'stricton' => FALSE,
    'failover' => array(),
    'save_queries' => TRUE
);

$dbconn=odbc_connect("myDSN", "", "");

if(!$dbconn)
{
    die("Could not connect Adaptive Server Anywhere: ".odbc_errormsg(). odbc_error());
} else {
    echo "connection success";
}

---

因此，由于它可以在使用手动代码时连接，有人能指导我如何使用CodeIgniter 3.1.10中的数据库代码成功连接吗？

在对此进行了大量研究之后，我相信问题不在于ODBC元素，而在于您没有自动加载数据库库。这个错误与ODBC无关，但正如我在这里发现的：是因为我不相信您已经自动加载了数据库