restructure seed

DataLayer/scripts/03-crud/04-Location/USP_CreateCity.sql

@@ -0,0 +1,30 @@
+CREATE OR ALTER PROCEDURE dbo.USP_CreateCity
+(
+    @CityName NVARCHAR(100),
+    @StateProvinceCode NVARCHAR(6)
+)
+AS
+BEGIN
+    SET NOCOUNT ON;
+    SET XACT_ABORT ON;
+
+    DECLARE @StateProvinceId UNIQUEIDENTIFIER = dbo.UDF_GetStateProvinceIdByCode(@StateProvinceCode);
+    IF @StateProvinceId IS NULL
+    BEGIN
+        RAISERROR('State/province not found for code.', 16, 1);
+        RETURN;
+    END
+
+    IF EXISTS (
+        SELECT 1
+        FROM dbo.City
+        WHERE CityName = @CityName
+            AND StateProvinceID = @StateProvinceId
+    )
+        RETURN;
+
+    INSERT INTO dbo.City
+        (StateProvinceID, CityName)
+    VALUES
+        (@StateProvinceId, @CityName);
+END;