feat: add feature flag for limit(0)

Author: kenjis

app/Config/Feature.php

@@ -18,4 +18,12 @@ class Feature extends BaseConfig
      * Use filter execution order in 4.4 or before.
      */
     public bool $oldFilterOrder = false;
+
+    /**
+     * Keep the behavior of `limit(0)` in Query Builder in 4.4 or before.
+     *
+     * If true, `limit(0)` returns all records. (the behavior in 4.4 or before)
+     * If false, `limit(0)` returns no records.
+     */
+    public bool $limitZeroAsAll = false;
 }

system/BaseModel.php

@@ -21,6 +21,7 @@
 use CodeIgniter\I18n\Time;
 use CodeIgniter\Pager\Pager;
 use CodeIgniter\Validation\ValidationInterface;
+use Config\Feature;
 use Config\Services;
 use InvalidArgumentException;
 use ReflectionClass;
@@ -596,6 +597,10 @@ public function findColumn(string $columnName)
      */
     public function findAll(?int $limit = null, int $offset = 0)
     {
+        if (config(Feature::class)->limitZeroAsAll) {
+            $limit ??= 0;
+        }
+
         if ($this->tempAllowCallbacks) {
             // Call the before event and check for a return
             $eventData = $this->trigger('beforeFind', [

system/Database/BaseBuilder.php

@@ -15,6 +15,7 @@
 use CodeIgniter\Database\Exceptions\DatabaseException;
 use CodeIgniter\Database\Exceptions\DataException;
 use CodeIgniter\Traits\ConditionalTrait;
+use Config\Feature;
 use InvalidArgumentException;
 
 /**
@@ -1603,6 +1604,10 @@ protected function compileFinalQuery(string $sql): string
      */
     public function get(?int $limit = null, int $offset = 0, bool $reset = true)
     {
+        if (config(Feature::class)->limitZeroAsAll) {
+            $limit ??= 0;
+        }
+
         if ($limit !== null) {
             $this->limit($limit, $offset);
         }
@@ -2493,6 +2498,13 @@ protected function _update(string $table, array $values): string
             $valStr[] = $key . ' = ' . $val;
         }
 
+        if (config(Feature::class)->limitZeroAsAll) {
+            return 'UPDATE ' . $this->compileIgnore('update') . $table . ' SET ' . implode(', ', $valStr)
+                . $this->compileWhereHaving('QBWhere')
+                . $this->compileOrderBy()
+                . ($this->QBLimit ? $this->_limit(' ', true) : '');
+        }
+
         return 'UPDATE ' . $this->compileIgnore('update') . $table . ' SET ' . implode(', ', $valStr)
             . $this->compileWhereHaving('QBWhere')
             . $this->compileOrderBy()
@@ -3028,7 +3040,11 @@ protected function compileSelect($selectOverride = false): string
             . $this->compileWhereHaving('QBHaving')
             . $this->compileOrderBy();
 
-        if ($this->QBLimit !== false || $this->QBOffset) {
+        if (config(Feature::class)->limitZeroAsAll) {
+            if ($this->QBLimit) {
+                $sql = $this->_limit($sql . "\n");
+            }
+        } elseif ($this->QBLimit !== false || $this->QBOffset) {
             $sql = $this->_limit($sql . "\n");
         }
 

system/Database/SQLSRV/Builder.php

@@ -16,6 +16,7 @@
 use CodeIgniter\Database\Exceptions\DataException;
 use CodeIgniter\Database\RawSql;
 use CodeIgniter\Database\ResultInterface;
+use Config\Feature;
 
 /**
  * Builder for SQLSRV
@@ -310,7 +311,7 @@ protected function _limit(string $sql, bool $offsetIgnore = false): string
         // DatabaseException:
         //   [Microsoft][ODBC Driver 17 for SQL Server][SQL Server]The number of
         //   rows provided for a FETCH clause must be greater then zero.
-        if ($this->QBLimit === 0) {
+        if (! config(Feature::class)->limitZeroAsAll && $this->QBLimit === 0) {
             return $sql . ' WHERE 1=0 ';
         }
 
@@ -596,7 +597,11 @@ protected function compileSelect($selectOverride = false): string
             . $this->compileOrderBy(); // ORDER BY
 
         // LIMIT
-        if ($this->QBLimit !== false || $this->QBOffset) {
+        if (config(Feature::class)->limitZeroAsAll) {
+            if ($this->QBLimit) {
+                $sql = $this->_limit($sql . "\n");
+            }
+        } elseif ($this->QBLimit !== false || $this->QBOffset) {
             $sql = $this->_limit($sql . "\n");
         }
 

system/Model.php

@@ -24,6 +24,7 @@
 use CodeIgniter\Exceptions\ModelException;
 use CodeIgniter\Validation\ValidationInterface;
 use Config\Database;
+use Config\Feature;
 use ReflectionException;
 
 /**
@@ -228,6 +229,10 @@ protected function doFindColumn(string $columnName)
      */
     protected function doFindAll(?int $limit = null, int $offset = 0)
     {
+        if (config(Feature::class)->limitZeroAsAll) {
+            $limit ??= 0;
+        }
+
         $builder = $this->builder();
 
         if ($this->tempUseSoftDeletes) {

tests/system/Database/Builder/GetTest.php

@@ -13,6 +13,7 @@
 
 use CodeIgniter\Test\CIUnitTestCase;
 use CodeIgniter\Test\Mock\MockConnection;
+use Config\Feature;
 
 /**
  * @internal
@@ -55,6 +56,22 @@ public function testGetWithReset(): void
         $this->assertSame($expectedSQLafterreset, str_replace("\n", ' ', $builder->get(0, 50, true)));
     }
 
+    public function testGetWithResetWithLimitZeroAsAll(): void
+    {
+        $config                 = config(Feature::class);
+        $config->limitZeroAsAll = true;
+
+        $builder = $this->db->table('users');
+        $builder->testMode()->where('username', 'bogus');
+
+        $expectedSQL           = 'SELECT * FROM "users" WHERE "username" = \'bogus\'';
+        $expectedSQLafterreset = 'SELECT * FROM "users"';
+
+        $this->assertSame($expectedSQL, str_replace("\n", ' ', $builder->get(0, 50, false)));
+        $this->assertSame($expectedSQL, str_replace("\n", ' ', $builder->get(0, 50, true)));
+        $this->assertSame($expectedSQLafterreset, str_replace("\n", ' ', $builder->get(0, 50, true)));
+    }
+
     /**
      * @see https://github.com/codeigniter4/CodeIgniter4/issues/2143
      */

tests/system/Database/Live/GetTest.php

@@ -14,6 +14,7 @@
 use CodeIgniter\Database\Exceptions\DatabaseException;
 use CodeIgniter\Test\CIUnitTestCase;
 use CodeIgniter\Test\DatabaseTestTrait;
+use Config\Feature;
 use Tests\Support\Database\Seeds\CITestSeeder;
 
 /**
@@ -55,6 +56,16 @@ public function testGetWithLimitZero(): void
         $this->assertCount(0, $jobs);
     }
 
+    public function testGetWithLimitZeroAsAll(): void
+    {
+        $config                 = config(Feature::class);
+        $config->limitZeroAsAll = true;
+
+        $jobs = $this->db->table('job')->limit(0)->get()->getResult();
+
+        $this->assertCount(4, $jobs);
+    }
+
     public function testGetWhereArray(): void
     {
         $jobs = $this->db->table('job')