Added: creating database, sql tx repository

cmd/serve/main.go

@@ -1,5 +1,13 @@
-package serve
+package main
+
+import (
+	"scrap/internal/config"
+	"scrap/internal/db"
+)
 
 func main() {
+	config.Setup()
 
+	db.Setup()
+	defer db.Close()
 }

config.json

@@ -0,0 +1,3 @@
+{
+    "sql-tables-dir": "./sqltable/"
+}

go.mod

@@ -1,3 +1,5 @@
 module scrap
 
 go 1.24.4
+
+require github.com/mattn/go-sqlite3 v1.14.32

go.sum

@@ -0,0 +1,2 @@
+github.com/mattn/go-sqlite3 v1.14.32 h1:JD12Ag3oLy1zQA+BNn74xRgaBbdhbNIDYvQUEuuErjs=
+github.com/mattn/go-sqlite3 v1.14.32/go.mod h1:Uh1q+B4BYcTPb+yiD3kU8Ct7aC0hY9fxUwlHK0RXw+Y=

internal/config/setup.go

@@ -0,0 +1,25 @@
+package config
+
+import (
+	"encoding/json"
+	"os"
+)
+
+type AppConfig struct {
+	SqlTablesDir string `json:"sql-tables-dir"`
+}
+
+var appConfigInstance *AppConfig
+
+func Setup() {
+	file, err := os.ReadFile("config.json")
+	if err != nil {
+		panic(err)
+	}
+
+	if err = json.Unmarshal(file, &appConfigInstance); err != nil {
+		panic(err)
+	}
+}
+
+func GetAppConfig() *AppConfig { return appConfigInstance }

internal/db/irepository.go

@@ -0,0 +1,14 @@
+package db
+
+import "database/sql"
+
+type ITxRepository interface {
+	// Creates a new tx.
+	Begin() (*sql.Tx, error)
+
+	// Rollbacks tx's data or returns an error to the given error's pointer address.
+	RollbackOnError(*sql.Tx, *error)
+
+	// Applies changes to the database.
+	Commit(*sql.Tx) error
+}

internal/db/repository.go

@@ -0,0 +1,34 @@
+package db
+
+import (
+	"database/sql"
+)
+
+type TxRepository struct {
+	db *sql.DB
+}
+
+func NewTxRepository(instance *sql.DB) ITxRepository {
+	return &TxRepository{
+		db: instance,
+	}
+}
+
+func (t TxRepository) Begin() (*sql.Tx, error) {
+	tx, err := t.db.Begin()
+	if err != nil {
+		return nil, err
+	}
+
+	return tx, nil
+}
+
+func (TxRepository) RollbackOnError(tx *sql.Tx, errObserve *error) {
+	if *errObserve != nil {
+		tx.Rollback()
+	}
+}
+
+func (TxRepository) Commit(tx *sql.Tx) error {
+	return tx.Commit()
+}

internal/db/setup.go

@@ -0,0 +1,65 @@
+package db
+
+import (
+	"database/sql"
+	"os"
+	"scrap/internal/config"
+	"strings"
+
+	_ "github.com/mattn/go-sqlite3"
+)
+
+var dbInstance *sql.DB
+
+func Setup() {
+	db, err := sql.Open("sqlite3", "./example.db")
+	if err != nil {
+		panic(err)
+	}
+
+	dbInstance = db
+
+	tableFilenames := getTableFilenames()
+	createTablesFromSQLFiles(tableFilenames)
+}
+
+func GetInstance() *sql.DB { return dbInstance }
+
+func Close() { dbInstance.Close() }
+
+func getTableFilenames() []string {
+	appConfig := config.GetAppConfig()
+
+	files, err := os.ReadDir(appConfig.SqlTablesDir)
+	if err != nil {
+		panic(err)
+	}
+
+	filenames := []string{}
+	for _, f := range files {
+		fName := f.Name()
+		if !strings.HasSuffix(fName, ".sql") {
+			continue
+		}
+
+		filenames = append(filenames, fName)
+	}
+
+	return filenames
+}
+
+func createTablesFromSQLFiles(filenames []string) {
+	appConfig := config.GetAppConfig()
+
+	for _, fName := range filenames {
+		tableBytes, err := os.ReadFile(appConfig.SqlTablesDir + fName)
+		if err != nil {
+			panic(err)
+		}
+
+		tableQuery := string(tableBytes)
+		if _, err = dbInstance.Exec(tableQuery); err != nil {
+			panic(err)
+		}
+	}
+}

sqltable/1_articles.sql

@@ -0,0 +1,5 @@
+CREATE TABLE IF NOT EXISTS articles(
+    uuid CHAR(36),
+    title VARCHAR(255),
+    content TEXT
+)