diff --git a/src/Charcoal/Property/PropertyField.php b/src/Charcoal/Property/PropertyField.php
index dc1c04ff..4480c63d 100644
--- a/src/Charcoal/Property/PropertyField.php
+++ b/src/Charcoal/Property/PropertyField.php
@@ -40,11 +40,21 @@ class PropertyField
      */
     private $extra;
 
+    /**
+     * @var \Closure
+     */
+    private $sqlSelectExpression;
+
     /**
      * @var mixed
      */
     private $val;
 
+    /**
+     * @var \Closure
+     */
+    private $sqlPdoBindParamExpression;
+
     /**
      * @var mixed
      */
@@ -86,9 +96,15 @@ public function setData(array $data)
         if (isset($data['extra'])) {
             $this->setExtra($data['extra']);
         }
+        if (isset($data['sqlSelectExpression'])) {
+            $this->setSqlSelectExpression($data['sqlSelectExpression']);
+        }
         if (isset($data['val'])) {
             $this->setVal($data['val']);
         }
+        if (isset($data['sqlPdoBindParamExpression'])) {
+            $this->setSqlPdoBindParamExpression($data['sqlPdoBindParamExpression']);
+        }
         if (isset($data['defaultVal'])) {
             $this->setDefaultVal($data['defaultVal']);
         }
@@ -247,6 +263,42 @@ public function sqlEncoding()
         return $this->sqlEncoding;
     }
 
+    /**
+     * Format the property's PDO select statement.
+     *
+     * This method can be overridden for custom select function parsing.
+     *
+     * This method allows a property to apply an SQL function to a property select statement:
+     *
+     * ```sql
+     * function ($select) {
+     *   return 'ST_AsGeoJSON('.$select.')';
+     * }
+     * ```
+     *
+     * This method returns a closure to be called during the processing of fetching the object
+     * or collection in {@see \Charcoal\Source\DatabaseSource}.
+     *
+     * @return \Closure
+     */
+    public function sqlSelectExpression()
+    {
+        return $this->sqlSelectExpression;
+    }
+
+    /**
+     * Set the SQL SELECT field expression.
+     *
+     * @param  \Closure $expression The field expression.
+     * @return self
+     */
+    public function setSqlSelectExpression($expression)
+    {
+        $this->sqlSelectExpression = $expression;
+
+        return $this;
+    }
+
     /**
      * @param  mixed $val The field value.
      * @return PropertyField Chainable
@@ -265,6 +317,40 @@ public function val()
         return $this->val;
     }
 
+    /**
+     * Format the property's PDO binding parameter identifier.
+     *
+     * This method allows a property to apply an SQL function to a named placeholder:
+     *
+     * ```sql
+     * function ($param) {
+     *     return 'ST_GeomFromGeoJSON('.$param.')';
+     * }
+     * ```
+     *
+     * This method returns a closure to be called during the processing of object
+     * inserts and updates in {@see \Charcoal\Source\DatabaseSource}.
+     *
+     * @link https://www.php.net/manual/en/pdostatement.bindparam.php
+     *
+     * @return \Closure
+     */
+    public function sqlPdoBindParamExpression()
+    {
+        return $this->sqlPdoBindParamExpression;
+    }
+
+    /**
+     * @param \Closure $sqlPdoBindParamExpression A callback function to apply an SQL function to a named placeholder.
+     * @return self
+     */
+    public function setSqlPdoBindParamExpression($sqlPdoBindParamExpression)
+    {
+        $this->sqlPdoBindParamExpression = $sqlPdoBindParamExpression;
+
+        return $this;
+    }
+
     /**
      * @param  mixed $defaultVal The default field value.
      * @return PropertyField Chainable
diff --git a/src/Charcoal/Property/StorablePropertyTrait.php b/src/Charcoal/Property/StorablePropertyTrait.php
index 63aa764d..7579611b 100644
--- a/src/Charcoal/Property/StorablePropertyTrait.php
+++ b/src/Charcoal/Property/StorablePropertyTrait.php
@@ -94,13 +94,46 @@ public function fieldIdent($key = null)
     /**
      * Retrieve the property's namespaced storage field names.
      *
-     * Examples:
-     * 1. `name`: `name_en`, `name_fr`, `name_de`
-     * 2. `obj`: `obj_id`, `obj_type`
-     * 3. `file`: `file`, `file_type`
-     * 4. `opt`: `opt_0`, `opt_1`, `opt_2`
+     * This method can be overridden for custom field names.
      *
-     * @return string[]
+     * Example #1 property `name`:
+     *
+     * ```
+     * {
+     *   "": "name_en"
+     * }
+     * ```
+     *
+     * Example #2 multilingual property `title`:
+     *
+     * ```
+     * {
+     *   "en": "title_en",
+     *   "fr": "title_fr",
+     *   "de": "title_de"
+     * }
+     * ```
+     *
+     * Example #3 custom property `obj`:
+     *
+     * ```
+     * {
+     *   "id": "obj_id",
+     *   "type": "obj_type"
+     * }
+     * ```
+     *
+     * Example #4 custom property `tuple`:
+     *
+     * ```
+     * {
+     *   "1": "tuple_1",
+     *   "2": "tuple_2",
+     *   "3": "tuple_3"
+     * }
+     * ```
+     *
+     * @return array<(string|int), string>
      */
     public function fieldNames()
     {
@@ -122,7 +155,35 @@ public function fieldNames()
     }
 
     /**
-     * Retrieve the property's value in a format suitable for the given field key.
+     * Format the property's PDO select statement.
+     *
+     * This method can be overridden for custom select function parsing.
+     *
+     * This method allows a property to apply an SQL function to a property select statement:
+     *
+     * ```sql
+     * function ($select) {
+     *   return 'ST_AsGeoJSON('.$select.')';
+     * }
+     * ```
+     *
+     * This method returns a closure to be called during the processing of fetching the object
+     * or collection in {@see \Charcoal\Source\DatabaseSource}.
+     *
+     * @return \Closure
+     */
+    protected function sqlSelectExpression()
+    {
+        return function ($select) {
+            return $select;
+        };
+    }
+
+    /**
+     * Format the property's value for the given field key suitable for storage.
+     *
+     * This method can be overridden for parsing custom field values.
+     * It is recommended to override {@see self::storageVal()} instead.
      *
      * @param  string $key The property field key.
      * @param  mixed  $val The value to set as field value.
@@ -190,6 +251,39 @@ public function storageVal($val)
         return $val;
     }
 
+    /**
+     * Format the property's PDO binding parameter identifier.
+     *
+     * This method can be overridden for custom named placeholder parsing.
+     *
+     * This method allows a property to apply an SQL function to a named placeholder:
+     *
+     * ```sql
+     * function ($param) {
+     *     return 'ST_GeomFromGeoJSON('.$param.')';
+     * }
+     * ```
+     *
+     * This method returns a closure to be called during the processing of object
+     * inserts and updates in {@see \Charcoal\Source\DatabaseSource}.
+     *
+     * @link https://www.php.net/manual/en/pdostatement.bindparam.php
+     *
+     * @return \Closure
+     */
+    protected function sqlPdoBindParamExpression()
+    {
+        /**
+         * Format the PDO parameter name.
+         *
+         * @param  string $param A PDO parameter name in the form `:name`.
+         * @return string The formatted parameter name.
+         */
+        return function ($param) {
+            return $param;
+        };
+    }
+
     /**
      * Parse the property's value (from a flattened structure)
      * in a format suitable for models.
@@ -254,14 +348,16 @@ protected function generateFields($val = null)
         $fieldNames = $this->fieldNames();
         foreach ($fieldNames as $fieldKey => $fieldName) {
             $field = $this->createPropertyField([
-                'ident'       => $fieldName,
-                'sqlType'     => $this->sqlType(),
-                'sqlPdoType'  => $this->sqlPdoType(),
-                'sqlEncoding' => $this->sqlEncoding(),
-                'extra'       => $this->sqlExtra(),
-                'val'         => $this->fieldValue($fieldKey, $val),
-                'defaultVal'  => $this->sqlDefaultVal(),
-                'allowNull'   => $this['allowNull'],
+                'ident'                     => $fieldName,
+                'sqlType'                   => $this->sqlType(),
+                'sqlPdoType'                => $this->sqlPdoType(),
+                'sqlEncoding'               => $this->sqlEncoding(),
+                'extra'                     => $this->sqlExtra(),
+                'val'                       => $this->fieldValue($fieldKey, $val),
+                'sqlSelectExpression'       => $this->sqlSelectExpression(),
+                'sqlPdoBindParamExpression' => $this->sqlPdoBindParamExpression(),
+                'defaultVal'                => $this->sqlDefaultVal(),
+                'allowNull'                 => $this['allowNull'],
             ]);
 
             $fields[$fieldKey] = $field;