diff --git a/ci/github/phpunit/ibm_db2.xml b/ci/github/phpunit/ibm_db2.xml
index 21bd09b2034..c0ac603aacf 100644
--- a/ci/github/phpunit/ibm_db2.xml
+++ b/ci/github/phpunit/ibm_db2.xml
@@ -6,8 +6,11 @@
          beStrictAboutTodoAnnotatedTests="true"
          failOnRisky="true"
          failOnWarning="true"
+         convertDeprecationsToExceptions="true"
 >
     <php>
+        <ini name="error_reporting" value="-1" />
+
         <var name="db_driver" value="ibm_db2"/>
         <var name="db_host" value="127.0.0.1"/>
         <var name="db_user" value="db2inst1"/>
diff --git a/ci/github/phpunit/mysqli-tls.xml b/ci/github/phpunit/mysqli-tls.xml
index 6931889a392..804fc80103a 100644
--- a/ci/github/phpunit/mysqli-tls.xml
+++ b/ci/github/phpunit/mysqli-tls.xml
@@ -6,8 +6,11 @@
          beStrictAboutTodoAnnotatedTests="true"
          failOnRisky="true"
          failOnWarning="true"
+         convertDeprecationsToExceptions="true"
 >
     <php>
+        <ini name="error_reporting" value="-1" />
+
         <var name="db_driver" value="mysqli"/>
         <var name="db_host" value="127.0.0.1"/>
         <var name="db_port" value="3306"/>
diff --git a/ci/github/phpunit/mysqli.xml b/ci/github/phpunit/mysqli.xml
index 8b5c48c2b9d..9ed7d336827 100644
--- a/ci/github/phpunit/mysqli.xml
+++ b/ci/github/phpunit/mysqli.xml
@@ -6,8 +6,11 @@
          beStrictAboutTodoAnnotatedTests="true"
          failOnRisky="true"
          failOnWarning="true"
+         convertDeprecationsToExceptions="true"
 >
     <php>
+        <ini name="error_reporting" value="-1" />
+
         <var name="db_driver" value="mysqli"/>
         <var name="db_host" value="127.0.0.1" />
         <var name="db_port" value="3306"/>
diff --git a/ci/github/phpunit/oci8.xml b/ci/github/phpunit/oci8.xml
index 327318f1247..ae6d21609be 100644
--- a/ci/github/phpunit/oci8.xml
+++ b/ci/github/phpunit/oci8.xml
@@ -6,8 +6,11 @@
          beStrictAboutTodoAnnotatedTests="true"
          failOnRisky="true"
          failOnWarning="true"
+         convertDeprecationsToExceptions="true"
 >
     <php>
+        <ini name="error_reporting" value="-1" />
+
         <var name="db_driver" value="oci8"/>
         <var name="db_host" value="localhost"/>
         <var name="db_user" value="doctrine"/>
diff --git a/ci/github/phpunit/pdo_mysql.xml b/ci/github/phpunit/pdo_mysql.xml
index a698bacc9ed..64b2bac7316 100644
--- a/ci/github/phpunit/pdo_mysql.xml
+++ b/ci/github/phpunit/pdo_mysql.xml
@@ -6,8 +6,11 @@
          beStrictAboutTodoAnnotatedTests="true"
          failOnRisky="true"
          failOnWarning="true"
+         convertDeprecationsToExceptions="true"
 >
     <php>
+        <ini name="error_reporting" value="-1" />
+
         <var name="db_driver" value="pdo_mysql"/>
         <var name="db_host" value="127.0.0.1" />
         <var name="db_port" value="3306"/>
diff --git a/ci/github/phpunit/pdo_oci.xml b/ci/github/phpunit/pdo_oci.xml
index d06b81f4a37..6df5f914121 100644
--- a/ci/github/phpunit/pdo_oci.xml
+++ b/ci/github/phpunit/pdo_oci.xml
@@ -6,8 +6,11 @@
          beStrictAboutTodoAnnotatedTests="true"
          failOnRisky="true"
          failOnWarning="true"
+         convertDeprecationsToExceptions="true"
 >
     <php>
+        <ini name="error_reporting" value="-1" />
+
         <var name="db_driver" value="pdo_oci"/>
         <var name="db_host" value="localhost"/>
         <var name="db_user" value="doctrine"/>
diff --git a/ci/github/phpunit/pdo_pgsql.xml b/ci/github/phpunit/pdo_pgsql.xml
index ec291ad8f2c..e477dfc11e8 100644
--- a/ci/github/phpunit/pdo_pgsql.xml
+++ b/ci/github/phpunit/pdo_pgsql.xml
@@ -6,8 +6,11 @@
          beStrictAboutTodoAnnotatedTests="true"
          failOnRisky="true"
          failOnWarning="true"
+         convertDeprecationsToExceptions="true"
 >
     <php>
+        <ini name="error_reporting" value="-1" />
+
         <var name="db_driver" value="pdo_pgsql"/>
         <var name="db_host" value="localhost" />
         <var name="db_user" value="postgres" />
diff --git a/ci/github/phpunit/pdo_sqlsrv.xml b/ci/github/phpunit/pdo_sqlsrv.xml
index d986bfd8ff6..c0eaf4bf7d3 100644
--- a/ci/github/phpunit/pdo_sqlsrv.xml
+++ b/ci/github/phpunit/pdo_sqlsrv.xml
@@ -6,8 +6,11 @@
          beStrictAboutTodoAnnotatedTests="true"
          failOnRisky="true"
          failOnWarning="true"
+         convertDeprecationsToExceptions="true"
 >
     <php>
+        <ini name="error_reporting" value="-1" />
+
         <var name="db_driver" value="pdo_sqlsrv"/>
         <var name="db_host" value="127.0.0.1" />
         <var name="db_user" value="sa" />
diff --git a/ci/github/phpunit/sqlite.xml b/ci/github/phpunit/sqlite.xml
index fc46cb75852..5b3b7f613c7 100644
--- a/ci/github/phpunit/sqlite.xml
+++ b/ci/github/phpunit/sqlite.xml
@@ -6,7 +6,12 @@
          beStrictAboutTodoAnnotatedTests="true"
          failOnRisky="true"
          failOnWarning="true"
+         convertDeprecationsToExceptions="true"
 >
+    <php>
+        <ini name="error_reporting" value="-1" />
+    </php>
+
     <testsuites>
         <testsuite name="Doctrine DBAL Test Suite">
             <directory>../../../tests</directory>
diff --git a/ci/github/phpunit/sqlsrv.xml b/ci/github/phpunit/sqlsrv.xml
index bcd4679f88e..8064a064b7d 100644
--- a/ci/github/phpunit/sqlsrv.xml
+++ b/ci/github/phpunit/sqlsrv.xml
@@ -6,8 +6,11 @@
          beStrictAboutTodoAnnotatedTests="true"
          failOnRisky="true"
          failOnWarning="true"
+         convertDeprecationsToExceptions="true"
 >
     <php>
+        <ini name="error_reporting" value="-1" />
+
         <var name="db_driver" value="sqlsrv"/>
         <var name="db_host" value="127.0.0.1" />
         <var name="db_user" value="sa" />
diff --git a/src/Connection.php b/src/Connection.php
index 46648423408..8dc055726ee 100644
--- a/src/Connection.php
+++ b/src/Connection.php
@@ -1674,11 +1674,11 @@ private function _bindTypedValues(DriverStatement $stmt, array $params, array $t
      * @param mixed                $value The value to bind.
      * @param int|string|Type|null $type  The type to bind (PDO or DBAL).
      *
-     * @return mixed[] [0] => the (escaped) value, [1] => the binding type.
+     * @return array{mixed, int} [0] => the (escaped) value, [1] => the binding type.
      *
      * @throws Exception
      */
-    private function getBindingInfo($value, $type)
+    private function getBindingInfo($value, $type): array
     {
         if (is_string($type)) {
             $type = Type::getType($type);
@@ -1688,7 +1688,7 @@ private function getBindingInfo($value, $type)
             $value       = $type->convertToDatabaseValue($value, $this->getDatabasePlatform());
             $bindingType = $type->getBindingType();
         } else {
-            $bindingType = $type;
+            $bindingType = $type ?? ParameterType::STRING;
         }
 
         return [$value, $bindingType];
diff --git a/src/Driver/PDO/SQLSrv/Statement.php b/src/Driver/PDO/SQLSrv/Statement.php
index d2da1625c48..2f48874e0d6 100644
--- a/src/Driver/PDO/SQLSrv/Statement.php
+++ b/src/Driver/PDO/SQLSrv/Statement.php
@@ -59,7 +59,7 @@ public function bindParam($param, &$variable, $type = ParameterType::STRING, $le
                 break;
         }
 
-        return $this->statement->bindParam($param, $variable, $type, $length, $driverOptions);
+        return $this->statement->bindParam($param, $variable, $type, $length ?? 0, $driverOptions);
     }
 
     /**
diff --git a/src/Schema/OracleSchemaManager.php b/src/Schema/OracleSchemaManager.php
index e24f79ffbec..13c8852435b 100644
--- a/src/Schema/OracleSchemaManager.php
+++ b/src/Schema/OracleSchemaManager.php
@@ -9,6 +9,7 @@
 use function array_change_key_case;
 use function array_values;
 use function assert;
+use function is_string;
 use function preg_match;
 use function str_replace;
 use function strpos;
@@ -68,7 +69,7 @@ protected function _getPortableTableIndexesList($tableIndexes, $tableName = null
             $keyName = strtolower($tableIndex['name']);
             $buffer  = [];
 
-            if (strtolower($tableIndex['is_primary']) === 'p') {
+            if ($tableIndex['is_primary'] === 'P') {
                 $keyName              = 'primary';
                 $buffer['primary']    = true;
                 $buffer['non_unique'] = false;
@@ -108,7 +109,9 @@ protected function _getPortableTableColumnDefinition($tableColumn)
         }
 
         // Default values returned from database sometimes have trailing spaces.
-        $tableColumn['data_default'] = trim($tableColumn['data_default']);
+        if (is_string($tableColumn['data_default'])) {
+            $tableColumn['data_default'] = trim($tableColumn['data_default']);
+        }
 
         if ($tableColumn['data_default'] === '' || $tableColumn['data_default'] === 'NULL') {
             $tableColumn['data_default'] = null;
diff --git a/src/Schema/PostgreSQLSchemaManager.php b/src/Schema/PostgreSQLSchemaManager.php
index 1559f5b1c7b..abc06af4785 100644
--- a/src/Schema/PostgreSQLSchemaManager.php
+++ b/src/Schema/PostgreSQLSchemaManager.php
@@ -21,7 +21,6 @@
 use function preg_replace;
 use function sprintf;
 use function str_replace;
-use function strlen;
 use function strpos;
 use function strtolower;
 use function trim;
@@ -347,16 +346,22 @@ protected function _getPortableTableColumnDefinition($tableColumn)
         $matches = [];
 
         $autoincrement = false;
-        if (preg_match("/^nextval\('(.*)'(::.*)?\)$/", $tableColumn['default'], $matches) === 1) {
+
+        if (
+            $tableColumn['default'] !== null
+            && preg_match("/^nextval\('(.*)'(::.*)?\)$/", $tableColumn['default'], $matches) === 1
+        ) {
             $tableColumn['sequence'] = $matches[1];
             $tableColumn['default']  = null;
             $autoincrement           = true;
         }
 
-        if (preg_match("/^['(](.*)[')]::/", $tableColumn['default'], $matches) === 1) {
-            $tableColumn['default'] = $matches[1];
-        } elseif (preg_match('/^NULL::/', $tableColumn['default']) === 1) {
-            $tableColumn['default'] = null;
+        if ($tableColumn['default'] !== null) {
+            if (preg_match("/^['(](.*)[')]::/", $tableColumn['default'], $matches) === 1) {
+                $tableColumn['default'] = $matches[1];
+            } elseif (preg_match('/^NULL::/', $tableColumn['default']) === 1) {
+                $tableColumn['default'] = null;
+            }
         }
 
         $length = $tableColumn['length'] ?? null;
@@ -380,7 +385,8 @@ protected function _getPortableTableColumnDefinition($tableColumn)
 
         $dbType = strtolower($tableColumn['type']);
         if (
-            strlen($tableColumn['domain_type']) > 0
+            $tableColumn['domain_type'] !== null
+            && $tableColumn['domain_type'] !== ''
             && ! $this->_platform->hasDoctrineTypeMappingFor($tableColumn['type'])
         ) {
             $dbType                       = strtolower($tableColumn['domain_type']);
@@ -520,7 +526,7 @@ protected function _getPortableTableColumnDefinition($tableColumn)
      */
     private function fixVersion94NegativeNumericDefaultValue($defaultValue)
     {
-        if (strpos($defaultValue, '(') === 0) {
+        if ($defaultValue !== null && strpos($defaultValue, '(') === 0) {
             return trim($defaultValue, '()');
         }