Add Docker Compose and backend Dockerfile
Include .gitignore, go.mod/go.sum, initial Go source, init.sql, and Docker‑Compose configuration for the MSSQL and backend services.
This commit is contained in:
173
backend/main.go
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173
backend/main.go
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package main
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import (
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"database/sql"
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"fmt"
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"log"
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"os"
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_ "github.com/denisenkom/go-mssqldb"
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)
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func main() {
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// Load DB connection settings from environment (set in docker‑compose)
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server := os.Getenv("DB_SERVER")
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user := os.Getenv("DB_USER")
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password := os.Getenv("DB_PASSWORD")
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dbName := os.Getenv("DB_NAME")
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if server == "" || user == "" || password == "" || dbName == "" {
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log.Fatalf("One or more DB environment variables are missing")
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}
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// Build the connection string for go‑mssqldb
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connStr := fmt.Sprintf("sqlserver://%s:%s@%s?database=%s", user, password, server, dbName)
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// Open a connection pool
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db, err := sql.Open("sqlserver", connStr)
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if err != nil {
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log.Fatalf("sql.Open failed: %v", err)
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}
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defer db.Close()
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// Verify the connection works
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if err = db.Ping(); err != nil {
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log.Fatalf("cannot ping database: %v", err)
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}
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fmt.Println("✅ Connected to MSSQL")
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// -----------------------------------------------------------------
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// 1️⃣ Insert a new customer via the stored procedure sp_InsertCustomer
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// -----------------------------------------------------------------
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var newCustID int
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insertCustSQL := `
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DECLARE @NewID int;
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EXEC dbo.sp_InsertCustomer
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@CustomerName = @name,
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@AddressLine1 = @addr1,
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@AddressLine2 = @addr2,
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@City = @city,
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@State = @state,
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@ZipCode = @zip,
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@Country = @country,
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@NewCustomerID = @NewID OUTPUT;
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SELECT @NewID;
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`
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row := db.QueryRow(insertCustSQL,
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sql.Named("name", "Acme Corp"),
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sql.Named("addr1", "123 Main St"),
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sql.Named("addr2", nil),
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sql.Named("city", "New York"),
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sql.Named("state", "NY"),
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sql.Named("zip", "10001"),
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sql.Named("country", "USA"),
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)
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if err = row.Scan(&newCustID); err != nil {
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log.Fatalf("Insert customer failed: %v", err)
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}
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fmt.Printf("🆕 Inserted Customer ID: %d\n", newCustID)
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// -----------------------------------------------------------------
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// 2️⃣ Insert a contact for the new customer via sp_InsertContact
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// -----------------------------------------------------------------
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var newContactID int
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insertContactSQL := `
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DECLARE @NewContactID int;
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EXEC dbo.sp_InsertContact
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@CustomerID = @custID,
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@ContactTypeID = @typeID,
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@ContactValue = @value,
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@IsPrimary = @primary,
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@NewContactID = @NewContactID OUTPUT;
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SELECT @NewContactID;
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`
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// Assume ContactTypeID 1 = Phone (created by init.sql)
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row = db.QueryRow(insertContactSQL,
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sql.Named("custID", newCustID),
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sql.Named("typeID", 1),
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sql.Named("value", "555‑1234"),
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sql.Named("primary", 1),
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)
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if err = row.Scan(&newContactID); err != nil {
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log.Fatalf("Insert contact failed: %v", err)
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}
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fmt.Printf("📞 Inserted Contact ID: %d\n", newContactID)
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// -----------------------------------------------------------------
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// 3️⃣ Retrieve the customer via sp_GetCustomer
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// -----------------------------------------------------------------
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var custName, addr1, addr2, city, state, zip, country string
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getCustSQL := `EXEC dbo.sp_GetCustomer @CustomerID = @id`
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err = db.QueryRow(getCustSQL, sql.Named("id", newCustID)).Scan(
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&newCustID, &custName, &addr1, &addr2, &city, &state, &zip, &country, &sql.NullTime{}, &sql.NullTime{})
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if err != nil {
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log.Fatalf("Get customer failed: %v", err)
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}
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fmt.Printf("🔎 Fetched Customer: %s, %s, %s\n", custName, city, state)
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// -----------------------------------------------------------------
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// 4️⃣ List contacts for the customer via sp_GetContactsByCustomer
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// -----------------------------------------------------------------
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fmt.Println("📄 Contacts for the customer:")
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rows, err := db.Query(`EXEC dbo.sp_GetContactsByCustomer @CustomerID = @id`, sql.Named("id", newCustID))
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if err != nil {
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log.Fatalf("Get contacts failed: %v", err)
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}
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defer rows.Close()
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for rows.Next() {
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var contactID, custID, ctID int
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var value string
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var isPrimary bool
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var typeName string
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if err = rows.Scan(&contactID, &custID, &ctID, &value, &isPrimary, &sql.NullTime{}, &sql.NullTime{}, &typeName); err != nil {
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log.Fatalf("Scanning contacts: %v", err)
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}
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fmt.Printf("- %s (%s) Primary:%v\n", value, typeName, isPrimary)
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}
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if err = rows.Err(); err != nil {
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log.Fatalf("Row iteration error: %v", err)
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}
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// -----------------------------------------------------------------
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// 5️⃣ Update the customer name via sp_UpdateCustomer
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// -----------------------------------------------------------------
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_, err = db.Exec(`EXEC dbo.sp_UpdateCustomer
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@CustomerID = @id,
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@CustomerName = @name,
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@AddressLine1 = @addr1,
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@AddressLine2 = @addr2,
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@City = @city,
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@State = @state,
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@ZipCode = @zip,
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@Country = @country`,
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sql.Named("id", newCustID),
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sql.Named("name", "Acme Corp – Updated"),
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sql.Named("addr1", "123 Main St"),
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sql.Named("addr2", nil),
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sql.Named("city", "New York"),
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sql.Named("state", "NY"),
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sql.Named("zip", "10001"),
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sql.Named("country", "USA"),
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)
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if err != nil {
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log.Fatalf("Update customer failed: %v", err)
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}
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fmt.Println("✏️ Updated customer name")
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// -----------------------------------------------------------------
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// 6️⃣ Delete the contact and the customer (cleanup)
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// -----------------------------------------------------------------
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_, err = db.Exec(`EXEC dbo.sp_DeleteContact @ContactID = @cid`, sql.Named("cid", newContactID))
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if err != nil {
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log.Fatalf("Delete contact failed: %v", err)
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}
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fmt.Println("🗑️ Deleted contact")
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_, err = db.Exec(`EXEC dbo.sp_DeleteCustomer @CustomerID = @cid`, sql.Named("cid", newCustID))
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if err != nil {
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log.Fatalf("Delete customer failed: %v", err)
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}
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fmt.Println("🗑️ Deleted customer")
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fmt.Println("✅ All CRUD operations completed successfully")
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}
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