diff --git a/src/Analyze/EntityAnalyzer.php b/src/Analyze/EntityAnalyzer.php
index 7fe8dda..838fd99 100644
--- a/src/Analyze/EntityAnalyzer.php
+++ b/src/Analyze/EntityAnalyzer.php
@@ -101,7 +101,17 @@ readonly class EntityAnalyzer
             );
         }
 
-        return $idFields[array_key_first($idFields)];
+        /** @var EntityField $field */
+        $field = $idFields[array_key_first($idFields)];
+
+        if ($field->readAccess === FieldAccess::NONE) {
+            throw new InvalidEntity(
+                "ID field $field->name of entity $this->entity has no viable read access. "
+                . "Implement a getter or make the property public."
+            );
+        }
+
+        return $field;
     }
 
     private function fieldFromParameter(ReflectionParameter $param): EntityField
@@ -186,17 +196,10 @@ readonly class EntityAnalyzer
         $hasPublicProp = $refClass->hasProperty($param->getName())
             && $refClass->getProperty($param->getName())->isPublic();
 
-        if ($refClass->hasMethod($getter)) {
-            $readAccess = FieldAccess::GETTER;
-        } elseif ($hasPublicProp) {
-            $readAccess = FieldAccess::PUBLIC;
-        } else {
-            throw new InvalidEntity(
-                "Constructor parameter of entity $this->entity '$param->name' has no valid reading method. "
-                . "Implement $getter() or make the field public."
-            );
-        }
-
-        return $readAccess;
+        return match (true) {
+            $refClass->hasMethod($getter) => FieldAccess::GETTER,
+            $hasPublicProp => FieldAccess::PUBLIC,
+            default => FieldAccess::NONE
+        };
     }
 }
diff --git a/src/Analyze/Result/FieldAccess.php b/src/Analyze/Result/FieldAccess.php
index 53719d2..dfb706f 100644
--- a/src/Analyze/Result/FieldAccess.php
+++ b/src/Analyze/Result/FieldAccess.php
@@ -8,4 +8,5 @@ enum FieldAccess
 {
     case GETTER;
     case PUBLIC;
+    case NONE;
 }
diff --git a/src/Repository/ResolutionStrategy/Execution/InsertEntity.php b/src/Repository/ResolutionStrategy/Execution/InsertEntity.php
new file mode 100644
index 0000000..8957c65
--- /dev/null
+++ b/src/Repository/ResolutionStrategy/Execution/InsertEntity.php
@@ -0,0 +1,65 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Kartierung\Repository\ResolutionStrategy\Execution;
+
+use Kartierung\Analyze\Result\EntityField;
+use Kartierung\Analyze\Result\EntityResult;
+use Kartierung\Repository\InvalidCall;
+use PDO;
+
+readonly class InsertEntity
+{
+    public function __construct(
+        private PDO $pdo
+    ) {}
+
+    /**
+     * @param EntityResult<object> $entityResult
+     * @param array<string, mixed> $data
+     * @return object
+     */
+    public function insert(EntityResult $entityResult, array $data): object
+    {
+        $newId = $this->insertWithNewId($entityResult, $data);
+
+        if ($newId === false) {
+            throw new InvalidCall(
+                "Expected new ID to be generated by database. "
+                . "New entities must be provided with a new ID by the database schema."
+            );
+        }
+
+        $newEntity = (new SelectEntityById($this->pdo))->select($entityResult, $newId);
+        if (!$newEntity) {
+            throw new InvalidCall(
+                "No Entity with id $newId could be found in table $entityResult->tableName after insert."
+            );
+        }
+
+        return $newEntity;
+    }
+
+    private function insertWithNewId(EntityResult $entityResult, array $data): string|false
+    {
+        $cols = implode(", ", array_map(
+            static fn(EntityField $field) => $field->columnName,
+            $entityResult->fields
+        ));
+        $vals = implode(", ", array_map(
+            static fn($_) => "?",
+            $entityResult->fields
+        ));
+        $params = array_map(
+            static fn(EntityField $field) => $data[$field->columnName] ?? null,
+            $entityResult->fields
+        );
+
+        $sql = "INSERT INTO $entityResult->tableName ($cols) VALUES ($vals)";
+        $prepStmt = $this->pdo->prepare($sql);
+        $prepStmt->execute($params);
+
+        return $this->pdo->lastInsertId();
+    }
+}
diff --git a/src/Repository/ResolutionStrategy/Execution/SelectAllEntities.php b/src/Repository/ResolutionStrategy/Execution/SelectAllEntities.php
new file mode 100644
index 0000000..439a787
--- /dev/null
+++ b/src/Repository/ResolutionStrategy/Execution/SelectAllEntities.php
@@ -0,0 +1,54 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Kartierung\Repository\ResolutionStrategy\Execution;
+
+use Kartierung\Analyze\Result\EntityField;
+use Kartierung\Analyze\Result\EntityResult;
+use Kartierung\Sql\DataToEntityMapper;
+use PDO;
+use PDOStatement;
+
+readonly class SelectAllEntities
+{
+    public function __construct(
+        private PDO $pdo
+    ) {}
+
+    /**
+     * @template E of object
+     * @param EntityResult<E> $entityResult
+     * @return list<E>
+     */
+    public function selectAll(EntityResult $entityResult): array
+    {
+        $fields = implode(
+            ', ',
+            array_map(
+                static fn(EntityField $e) => $e->columnName, $entityResult->fields
+            )
+        );
+        $sql = "
+            SELECT $fields
+              FROM {$entityResult->tableName}
+        ";
+
+        /** @var PDOStatement $stmt */
+        $stmt = $this->pdo->prepare($sql);
+        $stmt->execute();
+
+        $statementResult = [];
+
+        $mapper = new DataToEntityMapper($entityResult);
+        while ($row = $stmt->fetch(
+            mode: PDO::FETCH_ASSOC
+        )) {
+            /** @var array<string, mixed> $row */
+            $entity = $mapper->toEntity($row);
+            $statementResult[] = $entity;
+        }
+
+        return $statementResult;
+    }
+}
diff --git a/src/Repository/ResolutionStrategy/Execution/SelectEntityById.php b/src/Repository/ResolutionStrategy/Execution/SelectEntityById.php
new file mode 100644
index 0000000..baf4164
--- /dev/null
+++ b/src/Repository/ResolutionStrategy/Execution/SelectEntityById.php
@@ -0,0 +1,55 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Kartierung\Repository\ResolutionStrategy\Execution;
+
+use Kartierung\Analyze\Result\EntityField;
+use Kartierung\Analyze\Result\EntityResult;
+use Kartierung\Sql\DataToEntityMapper;
+use PDO;
+use PDOStatement;
+
+readonly class SelectEntityById
+{
+    public function __construct(
+        private PDO $pdo
+    ) {}
+
+    /**
+     * @template E of object
+     * @param EntityResult<E> $entityResult
+     * @param mixed $id
+     * @return E|null
+     */
+    public function select(EntityResult $entityResult, mixed $id): ?object
+    {
+        $fields = implode(
+            ', ',
+            array_map(
+                static fn(EntityField $e) => $e->columnName, $entityResult->fields
+            )
+        );
+
+        $idField = $entityResult->idField->name;
+
+        $sql = "
+            SELECT $fields
+              FROM {$entityResult->tableName}
+             WHERE $idField = ?
+        ";
+
+        /** @var PDOStatement $stmt */
+        $stmt = $this->pdo->prepare($sql);
+        $stmt->execute([$id]);
+
+        /** @var array<string, mixed>|false $row */
+        $row = $stmt->fetch(mode: PDO::FETCH_ASSOC);
+        if ($row) {
+            $mapper = new DataToEntityMapper($entityResult);
+            return $mapper->toEntity($row);
+        }
+
+        return null;
+    }
+}
diff --git a/src/Repository/ResolutionStrategy/FindAll.php b/src/Repository/ResolutionStrategy/FindAll.php
index 71382c3..83d5e89 100644
--- a/src/Repository/ResolutionStrategy/FindAll.php
+++ b/src/Repository/ResolutionStrategy/FindAll.php
@@ -5,12 +5,10 @@ declare(strict_types=1);
 namespace Kartierung\Repository\ResolutionStrategy;
 
 use Kartierung\Analyze\EntityAnalyzer;
-use Kartierung\Analyze\Result\EntityField;
 use Kartierung\Analyze\Result\RepositoryMethod;
-use Kartierung\Sql\DataToEntityMapper;
+use Kartierung\Repository\ResolutionStrategy\Execution\SelectAllEntities;
 use Kartierung\Sql\LazyQuery;
 use PDO;
-use PDOStatement;
 
 readonly class FindAll implements ResolutionStrategy
 {
@@ -20,34 +18,8 @@ readonly class FindAll implements ResolutionStrategy
             /** @var class-string $entityFqcn */
             $entityFqcn = $method->returnListType;
             $entityResult = (new EntityAnalyzer($entityFqcn))->analyze();
-            $mapper = new DataToEntityMapper($entityResult);
 
-            $fields = implode(
-                ', ',
-                array_map(
-                    static fn(EntityField $e) => $e->columnName, $entityResult->fields
-                )
-            );
-            $sql = "
-                SELECT $fields
-                  FROM {$entityResult->tableName}
-            ";
-
-            /** @var PDOStatement $stmt */
-            $stmt = $pdo->prepare($sql);
-            $stmt->execute();
-
-            $statementResult = [];
-
-            while ($row = $stmt->fetch(
-                mode: PDO::FETCH_ASSOC
-            )) {
-                /** @var array<string, mixed> $row */
-                $entity = $mapper->toEntity($row);
-                $statementResult[] = $entity;
-            }
-
-            return $statementResult;
+            return (new SelectAllEntities($pdo))->selectAll($entityResult);
         });
     }
 }
diff --git a/src/Repository/ResolutionStrategy/FindById.php b/src/Repository/ResolutionStrategy/FindById.php
index d6ee635..e107419 100644
--- a/src/Repository/ResolutionStrategy/FindById.php
+++ b/src/Repository/ResolutionStrategy/FindById.php
@@ -7,6 +7,8 @@ namespace Kartierung\Repository\ResolutionStrategy;
 use Kartierung\Analyze\EntityAnalyzer;
 use Kartierung\Analyze\Result\EntityField;
 use Kartierung\Analyze\Result\RepositoryMethod;
+use Kartierung\Repository\InvalidCall;
+use Kartierung\Repository\ResolutionStrategy\Execution\SelectEntityById;
 use Kartierung\Sql\DataToEntityMapper;
 use Kartierung\Sql\LazyQuery;
 use PDO;
@@ -18,37 +20,18 @@ readonly class FindById implements ResolutionStrategy
     {
         return new LazyQuery(
             static function (PDO $pdo) use ($method, $parameters) {
+                $id = array_first($parameters);
+                if($id === null || count($parameters) !== 1) {
+                    throw new InvalidCall(
+                        "Expected exactly on parameter as id of an entity to find. $id was given."
+                    );
+                }
+
                 /** @var class-string<object> $type */
                 $type = $method->returnType;
                 $entityResult = (new EntityAnalyzer($type))->analyze();
-                $mapper = new DataToEntityMapper($entityResult);
-
-                $fields = implode(
-                    ', ',
-                    array_map(
-                        static fn(EntityField $e) => $e->columnName, $entityResult->fields
-                    )
-                );
-
-                $idField = $entityResult->idField->name;
-
-                $sql = "
-                    SELECT $fields
-                      FROM {$entityResult->tableName}
-                     WHERE $idField = ?
-                ";
-
-                /** @var PDOStatement $stmt */
-                $stmt = $pdo->prepare($sql);
-                $stmt->execute([array_first($parameters)]);
-
-                /** @var array<string, mixed>|false $row */
-                $row = $stmt->fetch(mode: PDO::FETCH_ASSOC);
-                if ($row) {
-                    return $mapper->toEntity($row);
-                }
 
-                return null;
+                return (new SelectEntityById($pdo))->select($entityResult, $id);
             }
         );
     }
diff --git a/src/Repository/ResolutionStrategy/SaveEntity.php b/src/Repository/ResolutionStrategy/SaveEntity.php
index 7ad7855..fbd7993 100644
--- a/src/Repository/ResolutionStrategy/SaveEntity.php
+++ b/src/Repository/ResolutionStrategy/SaveEntity.php
@@ -9,6 +9,7 @@ use Kartierung\Analyze\Result\EntityResult;
 use Kartierung\Analyze\Result\RepositoryMethod;
 use Kartierung\Analyze\Result\RepositoryMethodParameter;
 use Kartierung\Repository\InvalidCall;
+use Kartierung\Repository\ResolutionStrategy\Execution\InsertEntity;
 use Kartierung\Sql\LazyQuery;
 use PDO;
 
@@ -17,7 +18,7 @@ class SaveEntity implements ResolutionStrategy
     public function createQuery(RepositoryMethod $method, array $parameters): LazyQuery
     {
         return new LazyQuery(
-            function (PDO $pdo) use ($method, $parameters) {
+            function (PDO $pdo) use ($method, $parameters): object|int {
                 /** @var RepositoryMethodParameter $firstDeclaredParam */
                 $firstDeclaredParam = array_first($method->parameters);
                 /** @var object $firstParam */
@@ -41,7 +42,7 @@ class SaveEntity implements ResolutionStrategy
                     return $this->update();
                 }
 
-                return $this->insert();
+                return $this->insert($pdo, $entityResult, $entityData);
             }
         );
     }
@@ -51,9 +52,15 @@ class SaveEntity implements ResolutionStrategy
         return 0;
     }
 
-    private function insert(): object
+    /**
+     * @param PDO $pdo
+     * @param EntityResult<object> $entityResult
+     * @param array<string, mixed> $data
+     * @return object
+     */
+    private function insert(PDO $pdo, EntityResult $entityResult, array $data): object
     {
-        return new \stdClass();
+        return (new InsertEntity($pdo))->insert($entityResult, $data);
     }
 
     /**
diff --git a/tests/Repository/ResolutionStrategy/SaveEntityTest.php b/tests/Repository/ResolutionStrategy/SaveEntityTest.php
new file mode 100644
index 0000000..d6bb06e
--- /dev/null
+++ b/tests/Repository/ResolutionStrategy/SaveEntityTest.php
@@ -0,0 +1,62 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Kartierung\Repository\ResolutionStrategy;
+
+use Kartierung\Analyze\Result\ParameterFunction;
+use Kartierung\Analyze\Result\RepositoryMethod;
+use Kartierung\Analyze\Result\RepositoryMethodParameter;
+use PHPUnit\Framework\Attributes\Group;
+
+class SaveEntityTest extends SqliteBaseCase
+{
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $this->getPdo()->exec(
+            "
+            CREATE TABLE SimpleEntity (
+                stringcol VARCHAR(250),
+                intcol INTEGER PRIMARY KEY AUTOINCREMENT
+            );
+            INSERT INTO SimpleEntity(stringcol, intcol)
+            VALUES ('dings', 1),
+                   ('bumms', 2);
+            "
+        );
+    }
+
+    #[Group('integration')]
+    public function testSelectsData(): void
+    {
+        // Given
+        $strategy = new SaveEntity();
+        $method = new RepositoryMethod(
+            query: '',
+            returnType: '',
+            returnsNullable: true,
+            returnListType: '',
+            name: '',
+            parameters: [
+                new RepositoryMethodParameter(
+                    name: '',
+                    type: SimpleEntity::class,
+                    function: ParameterFunction::STATEMENT_PARAMETER
+                )
+            ],
+            resolutionStrategy: $strategy
+        );
+        $entity = new SimpleEntity(null, 'foobar');
+        $query = $method->createQuery([$entity]);
+
+        // When
+        $result = $query->execute($this->getPdo());
+
+        // Then
+        $this->assertInstanceOf(SimpleEntity::class, $result);
+        $this->assertNotNull($result->intcol);
+    }
+
+}
diff --git a/tests/Repository/ResolutionStrategy/SimpleEntity.php b/tests/Repository/ResolutionStrategy/SimpleEntity.php
index a2e28c4..50943f6 100644
--- a/tests/Repository/ResolutionStrategy/SimpleEntity.php
+++ b/tests/Repository/ResolutionStrategy/SimpleEntity.php
@@ -10,7 +10,7 @@ class SimpleEntity
 {
     public function __construct(
         #[Id]
-        public int $intcol,
+        public ?int $intcol,
         public string $stringcol
     ) {}
 }