userStore find buggy

TODO.md

@@ -2,3 +2,4 @@
 
 - [x] The mail field is case sensitive. Convert mail to lowercase before they are sent to InsertUser
 - [] All errors are fatal. Provide proper error handling.
+- [] Refactor UserStore code

data/psql.go

@@ -33,9 +33,10 @@ func UsePSQL() {
 	// log.Print(u)
 	u1 := model.NewUser(3, 20, "paul", "newman", "PdsNz@FDKML.COM")
 	store.Update(16, u1)
-	log.Print(store.Get(1))
+	log.Println(store.Get(1))
 	// store.Delete(8)
-	log.Print(store.GetAll())
+	log.Println(store.GetAll())
+	log.Println(store.Find("first_name", "John"))
 }
 
 func sqlExec(db *sql.DB, s string) {
@@ -58,6 +59,6 @@ type Store interface {
 	Get(id int) (model.User, error)
 	GetAll(id int) ([]model.User, error)
 	Delete(id int)
-	// Find(id int)
+	Find(ex string)
 	Update(id int, i interface{})
 }

data/userQueries.go

@@ -19,7 +19,13 @@ const (
 
 	// QueryGetAll is the SQL command used to retrieve all users from the database.
 	QueryGetAll = `
-	SELECT * FROM users;
+	SELECT * FROM users ORDER BY id;
+	`
+
+	// QueryFind is the SQL command used to retrieve all users from the table
+	// which satisfy the specified condition
+	QueryFind = `
+	SELECT * FROM users WHERE $1 = $2;
 	`
 
 	// QueryInsert is the SQL command used to insert a user in the table.

data/userStore.go

@@ -39,6 +39,28 @@ func (us UserStore) GetAll() ([]model.User, error) {
 	return users, nil
 }
 
+// Find retrieves a user from the database using an expression
+func (us UserStore) Find(k interface{}, v interface{}) ([]model.User, error) {
+	var id, age int
+	var firstName, lastName, email string
+
+	rows, err := us.db.Query(QueryFind, k, v)
+	if err != nil {
+		return nil, err
+	}
+
+	var users []model.User
+	for rows.Next() {
+		err := rows.Scan(&id, &age, &firstName, &lastName, &email)
+		if err != nil {
+			log.Fatal(err) // too severe
+		}
+		u := model.NewUser(id, age, firstName, lastName, email)
+		users = append(users, u)
+	}
+	return users, nil
+}
+
 // Get retrieves the user identified by 'id' from database
 func (us UserStore) Get(uid int) (model.User, error) {
 	var id, age int

model/user.go

@@ -18,7 +18,7 @@ func TestUser() User {
 		id:        42,
 		firstName: "John",
 		lastName:  "Doe",
-		email:     "jddddSZ@mail.com",
+		email:     "jd@mail.com",
 		age:       42,
 	}
 }