init - add project files

tools/jet-2.12.0/examples/quick-start/README.md

@@ -0,0 +1,12 @@
+
+# Quick start example
+
+This package contains sample usage for Jet framework.
+
+Jet generated files of interest are in `./gen` folder.
+
+`quick-start.go` - contains code explained at main [README.md](../../README.md#quick-start),
+with a difference of redirecting json output to files(`dest.json` and `dest2.json`) rather then to a
+standard output.
+
+`./gen`, `dest.json` and `dest2.json` - added into git for presentation purposes.

tools/jet-2.12.0/examples/quick-start/quick-start.go

@@ -0,0 +1,118 @@
+package main
+
+import (
+	"database/sql"
+	"encoding/json"
+	"fmt"
+	"os"
+
+	_ "github.com/lib/pq"
+
+	// dot import so that jet go code would resemble as much as native SQL
+	// dot import is not mandatory
+	. "github.com/go-jet/jet/v2/examples/quick-start/.gen/jetdb/dvds/table"
+	. "github.com/go-jet/jet/v2/postgres"
+
+	"github.com/go-jet/jet/v2/examples/quick-start/.gen/jetdb/dvds/model"
+)
+
+const (
+	host     = "localhost"
+	port     = 5432
+	user     = "jet"
+	password = "jet"
+	dbName   = "jetdb"
+)
+
+func main() {
+	// Connect to database
+	var connectString = fmt.Sprintf("host=%s port=%d user=%s password=%s dbname=%s sslmode=disable", host, port, user, password, dbName)
+
+	db, err := sql.Open("postgres", connectString)
+	panicOnError(err)
+	defer db.Close()
+
+	// Write query
+	stmt := SELECT(
+		Actor.ActorID, Actor.FirstName, Actor.LastName, Actor.LastUpdate,
+		Film.AllColumns,
+		Language.AllColumns.Except(Language.LastUpdate),
+		Category.AllColumns,
+	).FROM(
+		Actor.
+			INNER_JOIN(FilmActor, Actor.ActorID.EQ(FilmActor.ActorID)).
+			INNER_JOIN(Film, Film.FilmID.EQ(FilmActor.FilmID)).
+			INNER_JOIN(Language, Language.LanguageID.EQ(Film.LanguageID)).
+			INNER_JOIN(FilmCategory, FilmCategory.FilmID.EQ(Film.FilmID)).
+			INNER_JOIN(Category, Category.CategoryID.EQ(FilmCategory.CategoryID)),
+	).WHERE(
+		Language.Name.EQ(Char(20)("English")).
+			AND(Category.Name.NOT_EQ(Text("Action"))).
+			AND(Film.Length.GT(Int(180))),
+	).ORDER_BY(
+		Actor.ActorID.ASC(),
+		Film.FilmID.ASC(),
+	)
+
+	// Execute query and store result
+	var dest []struct {
+		model.Actor
+
+		Films []struct {
+			model.Film
+
+			Language   model.Language
+			Categories []model.Category
+		}
+	}
+
+	err = stmt.Query(db, &dest)
+	panicOnError(err)
+
+	printStatementInfo(stmt)
+	jsonSave("./dest.json", dest)
+
+	// New Destination
+
+	var dest2 []struct {
+		model.Category
+
+		Films  []model.Film
+		Actors []model.Actor
+	}
+
+	err = stmt.Query(db, &dest2)
+	panicOnError(err)
+
+	jsonSave("./dest2.json", dest2)
+}
+
+func jsonSave(path string, v interface{}) {
+	jsonText, _ := json.MarshalIndent(v, "", "\t")
+
+	err := os.WriteFile(path, jsonText, 0600)
+
+	panicOnError(err)
+}
+
+func printStatementInfo(stmt SelectStatement) {
+	query, args := stmt.Sql()
+
+	fmt.Println("Parameterized query: ")
+	fmt.Println("==============================")
+	fmt.Println(query)
+	fmt.Println("Arguments: ")
+	fmt.Println(args)
+
+	debugSQL := stmt.DebugSql()
+
+	fmt.Println("\n\nDebug sql: ")
+	fmt.Println("==============================")
+	fmt.Println(debugSQL)
+}
+
+func panicOnError(err error) {
+	if err != nil {
+		panic(err)
+	}
+}