Use verbose DB output for errors

app/Views/errors/html/error_404.php

@@ -74,7 +74,7 @@
 
 		<p>
 			<?php if (! empty($message) && $message !== '(null)') : ?>
-				<?= esc($message) ?>
+				<?= esc(nl2br($message)) ?>
 			<?php else : ?>
 				Sorry! Cannot seem to find the page you were looking for.
 			<?php endif ?>

app/Views/errors/html/error_exception.php

@@ -21,7 +21,7 @@
 		<div class="container">
 			<h1><?= esc($title), esc($exception->getCode() ? ' #' . $exception->getCode() : '') ?></h1>
 			<p>
-				<?= esc($exception->getMessage()) ?>
+				<?= esc(nl2br($exception->getMessage())) ?>
 				<a href="https://www.duckduckgo.com/?q=<?= urlencode($title . ' ' . preg_replace('#\'.*\'|".*"#Us', '', $exception->getMessage())) ?>"
 				   rel="noreferrer" target="_blank">search &rarr;</a>
 			</p>

system/Database/BaseConnection.php

@@ -342,6 +342,7 @@ public function initialize()
 		//--------------------------------------------------------------------
 
 		$this->connectTime = microtime(true);
+		$connectionErrors  = [];
 
 		try
 		{
@@ -350,6 +351,7 @@ public function initialize()
 		}
 		catch (Throwable $e)
 		{
+			$connectionErrors[] = sprintf('Main connection [%s]: %s', $this->DBDriver, $e->getMessage());
 			log_message('error', 'Error connecting to the database: ' . $e->getMessage());
 		}
 
@@ -360,7 +362,7 @@ public function initialize()
 			if (! empty($this->failover) && is_array($this->failover))
 			{
 				// Go over all the failovers
-				foreach ($this->failover as $failover)
+				foreach ($this->failover as $index => $failover)
 				{
 					// Replace the current settings with those of the failover
 					foreach ($failover as $key => $val)
@@ -378,6 +380,7 @@ public function initialize()
 					}
 					catch (Throwable $e)
 					{
+						$connectionErrors[] = sprintf('Failover #%d [%s]: %s', ++$index, $this->DBDriver, $e->getMessage());
 						log_message('error', 'Error connecting to the database: ' . $e->getMessage());
 					}
 
@@ -392,7 +395,11 @@ public function initialize()
 			// We still don't have a connection?
 			if (! $this->connID)
 			{
-				throw new DatabaseException('Unable to connect to the database.');
+				throw new DatabaseException(sprintf(
+					'Unable to connect to the database.%s%s',
+					PHP_EOL,
+					implode(PHP_EOL, $connectionErrors)
+				));
 			}
 		}
 

tests/system/Database/BaseConnectionTest.php

@@ -1,8 +1,13 @@
-<?php namespace CodeIgniter\Database;
+<?php
 
+namespace CodeIgniter\Database;
+
+use CodeIgniter\Database\Exceptions\DatabaseException;
+use CodeIgniter\Test\CIUnitTestCase;
 use CodeIgniter\Test\Mock\MockConnection;
+use Throwable;
 
-class BaseConnectionTest extends \CodeIgniter\Test\CIUnitTestCase
+class BaseConnectionTest extends CIUnitTestCase
 {
 	protected $options = [
 		'DSN'      => '',
@@ -42,8 +47,6 @@ class BaseConnectionTest extends \CodeIgniter\Test\CIUnitTestCase
 		'failover' => [],
 	];
 
-	//--------------------------------------------------------------------
-
 	public function testSavesConfigOptions()
 	{
 		$db = new MockConnection($this->options);
@@ -64,94 +67,75 @@ public function testSavesConfigOptions()
 		$this->assertSame([], $db->failover);
 	}
 
-	//--------------------------------------------------------------------
-
 	public function testConnectionThrowExceptionWhenCannotConnect()
 	{
-		$db = new MockConnection($this->options);
-
-		$this->expectException('\CodeIgniter\Database\Exceptions\DatabaseException');
-		$this->expectExceptionMessage('Unable to connect to the database.');
-
-		$db->shouldReturn('connect', false)
-			->initialize();
+		try
+		{
+			$db = new MockConnection($this->options);
+			$db->shouldReturn('connect', false)->initialize();
+		}
+		catch (Throwable $e)
+		{
+			$this->assertInstanceOf(DatabaseException::class, $e);
+			$this->assertStringContainsString('Unable to connect to the database.', $e->getMessage());
+		}
 	}
 
-	//--------------------------------------------------------------------
-
 	public function testCanConnectAndStoreConnection()
 	{
 		$db = new MockConnection($this->options);
-
-		$db->shouldReturn('connect', 123)
-			->initialize();
+		$db->shouldReturn('connect', 123)->initialize();
 
 		$this->assertSame(123, $db->getConnection());
 	}
 
-	//--------------------------------------------------------------------
-
 	/**
-	 * @throws \CodeIgniter\Database\Exceptions\DatabaseException
-	 * @group  single
+	 * @group single
 	 */
 	public function testCanConnectToFailoverWhenNoConnectionAvailable()
 	{
 		$options             = $this->options;
 		$options['failover'] = [$this->failoverOptions];
 
 		$db = new MockConnection($options);
-
-		$db->shouldReturn('connect', [false, 345])
-		   ->initialize();
+		$db->shouldReturn('connect', [false, 345])->initialize();
 
 		$this->assertSame(345, $db->getConnection());
 		$this->assertSame('failover', $db->username);
 	}
 
-	//--------------------------------------------------------------------
-
 	public function testStoresConnectionTimings()
 	{
 		$start = microtime(true);
 
 		$db = new MockConnection($this->options);
-
 		$db->initialize();
 
 		$this->assertGreaterThan($start, $db->getConnectStart());
 		$this->assertGreaterThan(0.0, $db->getConnectDuration());
 	}
 
-	//--------------------------------------------------------------------
-
 	public function testMagicIssetTrue()
 	{
 		$db = new MockConnection($this->options);
 
 		$this->assertTrue(isset($db->charset));
 	}
 
-	//--------------------------------------------------------------------
-
 	public function testMagicIssetFalse()
 	{
 		$db = new MockConnection($this->options);
 
 		$this->assertFalse(isset($db->foobar));
 	}
 
-	//--------------------------------------------------------------------
-
 	public function testMagicGet()
 	{
 		$db = new MockConnection($this->options);
 
-		$this->assertEquals('utf8', $db->charset);
+		$this->assertSame('utf8', $db->charset);
 	}
 
-	//--------------------------------------------------------------------
-
 	public function testMagicGetMissing()
 	{
 		$db = new MockConnection($this->options);