[BC] Replaced PDO constants with values

composer.json

@@ -22,7 +22,6 @@
     ],
     "require": {
         "php": "^7.2",
-        "ext-pdo": "*",
         "doctrine/cache": "^1.0",
         "doctrine/event-manager": "^1.0"
     },

lib/Doctrine/DBAL/ColumnCase.php

@@ -2,8 +2,6 @@
 
 namespace Doctrine\DBAL;
 
-use PDO;
-
 /**
  * Contains portable column case conversions.
  */
@@ -14,14 +12,14 @@ final class ColumnCase
      *
      * @see \PDO::CASE_UPPER
      */
-    public const UPPER = PDO::CASE_UPPER;
+    public const UPPER = 1;
 
     /**
      * Convert column names to lower case.
      *
      * @see \PDO::CASE_LOWER
      */
-    public const LOWER = PDO::CASE_LOWER;
+    public const LOWER = 2;
 
     /**
      * This class cannot be instantiated.

lib/Doctrine/DBAL/FetchMode.php

@@ -2,8 +2,6 @@
 
 namespace Doctrine\DBAL;
 
-use PDO;
-
 /**
  * Contains statement fetch modes.
  */
@@ -17,7 +15,7 @@ final class FetchMode
      *
      * @see \PDO::FETCH_ASSOC
      */
-    public const ASSOCIATIVE = PDO::FETCH_ASSOC;
+    public const ASSOCIATIVE = 2;
 
     /**
      * Specifies that the fetch method shall return each row as an array indexed
@@ -26,7 +24,7 @@ final class FetchMode
      *
      * @see \PDO::FETCH_NUM
      */
-    public const NUMERIC = PDO::FETCH_NUM;
+    public const NUMERIC = 3;
 
     /**
      * Specifies that the fetch method shall return each row as an array indexed
@@ -35,7 +33,7 @@ final class FetchMode
      *
      * @see \PDO::FETCH_BOTH
      */
-    public const MIXED = PDO::FETCH_BOTH;
+    public const MIXED = 4;
 
     /**
      * Specifies that the fetch method shall return each row as an object with
@@ -44,23 +42,23 @@ final class FetchMode
      *
      * @see \PDO::FETCH_OBJ
      */
-    public const STANDARD_OBJECT = PDO::FETCH_OBJ;
+    public const STANDARD_OBJECT = 5;
 
     /**
      * Specifies that the fetch method shall return only a single requested
      * column from the next row in the result set.
      *
      * @see \PDO::FETCH_COLUMN
      */
-    public const COLUMN = PDO::FETCH_COLUMN;
+    public const COLUMN = 7;
 
     /**
      * Specifies that the fetch method shall return a new instance of the
      * requested class, mapping the columns to named properties in the class.
      *
      * @see \PDO::FETCH_CLASS
      */
-    public const CUSTOM_OBJECT = PDO::FETCH_CLASS;
+    public const CUSTOM_OBJECT = 8;
 
     /**
      * This class cannot be instantiated.

lib/Doctrine/DBAL/ParameterType.php

@@ -2,8 +2,6 @@
 
 namespace Doctrine\DBAL;
 
-use PDO;
-
 /**
  * Contains statement parameter types.
  */
@@ -14,35 +12,35 @@ final class ParameterType
      *
      * @see \PDO::PARAM_NULL
      */
-    public const NULL = PDO::PARAM_NULL;
+    public const NULL = 0;
 
     /**
      * Represents the SQL INTEGER data type.
      *
      * @see \PDO::PARAM_INT
      */
-    public const INTEGER = PDO::PARAM_INT;
+    public const INTEGER = 1;
 
     /**
      * Represents the SQL CHAR, VARCHAR, or other string data type.
      *
      * @see \PDO::PARAM_STR
      */
-    public const STRING = PDO::PARAM_STR;
+    public const STRING = 2;
 
     /**
      * Represents the SQL large object data type.
      *
      * @see \PDO::PARAM_LOB
      */
-    public const LARGE_OBJECT = PDO::PARAM_LOB;
+    public const LARGE_OBJECT = 3;
 
     /**
      * Represents a boolean data type.
      *
      * @see \PDO::PARAM_BOOL
      */
-    public const BOOLEAN = PDO::PARAM_BOOL;
+    public const BOOLEAN = 5;
 
     /**
      * Represents a binary string data type.