Add POST methods

MindBoxApi/Controllers/CategoryController.cs

@@ -13,7 +13,8 @@ public class CategoryController : ControllerBase
 		_helper = helper;
 	}
 	[HttpGet]
-	public IEnumerable<Category> GetCategories()	{
+	public IEnumerable<Category> GetCategories()
+	{
 		var command = _helper.Connection.CreateCommand();
 		command.CommandText =
 		@"
@@ -31,4 +32,21 @@ public class CategoryController : ControllerBase
 			}
 		}
 	}
+	
+	[HttpPost]
+	public  IActionResult PostCategory([FromBody] Category category)
+	{		
+		var command = _helper.Connection.CreateCommand();
+		command.CommandText =
+			$"INSERT INTO categories (category_id, category_name) VALUES ({category.Id}, '{category.Name}')";
+		try 
+		{
+			command.ExecuteNonQuery();
+			return Ok();
+		}
+		catch (Exception ex)
+		{
+			return BadRequest(ex.Message);
+		}
+	}
 }

MindBoxApi/Controllers/ItemController.cs

@@ -37,4 +37,21 @@ public class ItemController : ControllerBase
 			}
 		}
 	}
+	
+	[HttpPost]
+	public  IActionResult PostItem([FromQuery] int? productId, [FromQuery] int? categoryId)
+	{		
+		var command = _helper.Connection.CreateCommand();
+		command.CommandText =
+			$"INSERT INTO grocery_store (product_id, category_id) VALUES ({productId}, {categoryId})";
+		try 
+		{
+			command.ExecuteNonQuery();
+			return Ok();
+		}
+		catch (Exception ex)
+		{
+			return BadRequest(ex.Message);
+		}
+	}
 }

MindBoxApi/Controllers/ProductController.cs

@@ -32,4 +32,21 @@ public class ProductController : ControllerBase
 			}
 		}
 	}
+	
+	[HttpPost]
+	public  IActionResult PostProduct([FromBody] Product product)
+	{		
+		var command = _helper.Connection.CreateCommand();
+		command.CommandText =
+			$"INSERT INTO products (product_id, product_name) VALUES ({product.Id}, '{product.Name}')";
+		try 
+		{
+			command.ExecuteNonQuery();
+			return Ok();
+		}
+		catch (Exception ex)
+		{
+			return BadRequest(ex.Message);
+		}
+	}
 }