Fix examples for migrated packages

Signed-off-by: Jan Tytgat <jan.tytgat@corelayer.eu>

examples/sqr/embeddedSqlWithoutRepository/main.go

@@ -0,0 +1,116 @@
+package main
+
+import (
+	"database/sql"
+	"embed"
+	"errors"
+	"fmt"
+
+	"git.flexabyte.io/flexabyte/go-kit/sqr"
+	"github.com/golang-migrate/migrate/v4"
+	"github.com/golang-migrate/migrate/v4/database"
+	"github.com/golang-migrate/migrate/v4/database/sqlite"
+	"github.com/golang-migrate/migrate/v4/source"
+	"github.com/golang-migrate/migrate/v4/source/iofs"
+)
+
+//go:embed assets/migrations/*
+var migrationFs embed.FS
+
+//go:embed assets/statements/*
+var statementsFS embed.FS
+
+var db *sql.DB
+
+func main() {
+	var err error
+
+	fmt.Println("Create in-memory database and run migrations:")
+	// Create in-memory demo database
+	if err = initialize(); err != nil {
+		panic(err)
+	}
+
+	fmt.Println("Fetch demo list query from filesystem:")
+	var query string
+	if query, err = sqr.LoadQueryFromFs(statementsFS, "assets/statements", "demo", "list"); err != nil {
+		panic(err)
+	}
+	fmt.Println("Query:", query)
+
+	if query, err = sqr.LoadQueryFromFs(statementsFS, "assets/statements", "demo", "insert"); err != nil {
+		panic(err)
+	}
+	fmt.Println("Query:", query)
+	fmt.Println("")
+
+	fmt.Println("Run insert statement:")
+	var stmtInsert *sql.Stmt
+	if stmtInsert, err = sqr.PrepareFromFs(db, statementsFS, "assets/statements", "demo", "insert"); err != nil {
+		panic(err)
+	}
+
+	var res int
+	if err = stmtInsert.QueryRow("item2").Scan(&res); err != nil {
+		panic(err)
+	}
+	fmt.Println("Successfully inserted into database, returned id:", res)
+
+	fmt.Println("")
+	fmt.Println("Run list statement:")
+	var stmtQuery *sql.Stmt
+	if stmtQuery, err = sqr.PrepareFromFs(db, statementsFS, "assets/statements", "demo", "list"); err != nil {
+		fmt.Println("Error preparing statement")
+	}
+
+	if stmtQuery == nil {
+		panic(errors.New("statement not found"))
+	}
+
+	var rows *sql.Rows
+	if rows, err = stmtQuery.Query(); err != nil {
+		fmt.Println("Error querying statement")
+	}
+	if rows != nil {
+		for rows.Next() {
+			var id int
+			var name string
+			if err = rows.Scan(&id, &name); err != nil {
+				fmt.Println("Error scanning row")
+			}
+			fmt.Println("Output", id, name)
+		}
+	}
+
+}
+
+func initialize() error {
+	var err error
+	db, err = sql.Open("sqlite", ":memory:")
+	if err != nil {
+		fmt.Println("Error opening database")
+		return err
+	}
+
+	var src source.Driver
+	if src, err = iofs.New(migrationFs, "assets/migrations"); err != nil {
+		fmt.Println("Error opening migrations source")
+		return err
+	}
+
+	var driver database.Driver
+	if driver, err = sqlite.WithInstance(db, &sqlite.Config{}); err != nil {
+		fmt.Println("Error opening migrations destination")
+		return err
+	}
+
+	var m *migrate.Migrate
+	if m, err = migrate.NewWithInstance("fs", src, "sqlite", driver); err != nil {
+		return err
+	}
+
+	if err = m.Up(); err != nil && !errors.Is(err, migrate.ErrNoChange) {
+		return err
+	}
+	return nil
+}