started adding sqlite code

internal/app/appContext.go

@@ -20,7 +20,7 @@ func (c *appContext) UseMetadataStore(connectionString string) error {
 
 	logrus.Infof("Using SQL Lite data store with '%s'", connectionString)
 	c.dataStore = localDataStore{}
-	err := c.dataStore.Open(connectionString)
+	err := c.dataStore.Initialize(connectionString)
 
 	return err
 }

internal/app/datastore.go

@@ -1,12 +1,16 @@
 package app
 
 import (
+	"database/sql"
 	"errors"
+	_ "github.com/mattn/go-sqlite3"
+	"log"
 	"time"
 )
 
 type ImageMetaData struct {
 	ImageId           int
+	PiwigoId          int
 	RelativeImagePath string
 	Filename          string
 	Md5Sum            string
@@ -27,21 +31,104 @@ type localDataStore struct {
 	connectionString string
 }
 
-func (d *localDataStore) Open(connectionString string) error {
+func (d *localDataStore) Initialize(connectionString string) error {
 	if connectionString == "" {
 		return errors.New("connection string could not be empty.")
 	}
 
 	d.connectionString = connectionString
 
-	//TODO: open and test connection
+	db, err := d.openDatabase()
-	return nil
+	if err != nil {
+		return err
+	}
+	defer db.Close()
+
+	err = d.createTablesIfNeeded(db)
+
+	return err
 }
 
 func (d *localDataStore) GetImageMetadata(relativePath string) (ImageMetaData, error) {
+	db, err := d.openDatabase()
+	if err != nil {
+		return ImageMetaData{}, err
+	}
+	defer db.Close()
+
+	tx, err := db.Begin()
+	if err != nil {
+		return ImageMetaData{}, err
+	}
+
+	//TODO: select entry by path
+	//stmt, err := tx.Prepare("select * from image WHERE relativePath = '?'")
+	//if err != nil {
+	//	log.Fatal(err)
+	//}
+
+	err = tx.Commit()
+	if err != nil {
+		log.Fatal(err)
+	}
+
 	return ImageMetaData{}, nil
 }
 
 func (d *localDataStore) SaveImageMetadata(m ImageMetaData) error {
-	return nil
+	db, err := d.openDatabase()
+	if err != nil {
+		return err
+	}
+	defer db.Close()
+
+	tx, err := db.Begin()
+	if err != nil {
+		return err
+	}
+
+	if m.ImageId <= 0 {
+		err = d.insertImageMetaData(tx, m)
+		if err != nil {
+			return err
+		}
+	} else {
+		// TODO: update existing entry
+	}
+
+	err = tx.Commit()
+	return err
+}
+
+func (d *localDataStore) insertImageMetaData(tx *sql.Tx, m ImageMetaData) error {
+	stmt, err := tx.Prepare("INSERT INTO image (piwigoId, relativePath, fileName, md5sum, lastChanged, categoryPath, categoryId) VALUES (?,?,?,?,?,?,?)")
+	if err != nil {
+		return err
+	}
+	_, err = stmt.Exec(m.PiwigoId, m.RelativeImagePath, m.Filename, m.Md5Sum, m.LastChange, m.CategoryPath, m.CategoryId)
+	return err
+}
+
+func (d *localDataStore) openDatabase() (*sql.DB, error) {
+	db, err := sql.Open("sqlite3", d.connectionString)
+	if err != nil {
+		return nil, err
+	}
+	db.SetMaxOpenConns(1)
+
+	return db, err
+}
+
+func (d *localDataStore) createTablesIfNeeded(db *sql.DB) error {
+	_, err := db.Exec("CREATE TABLE IF NOT EXISTS image (" +
+		"imageId INTEGER PRIMARY KEY AUTOINCREMENT," +
+		"piwigoId INTEGER NULL," +
+		"relativePath NVARCHAR(1000) NOT NULL," +
+		"fileName NVARCHAR(255) NOT NULL," +
+		"md5sum NVARCHAR(50) NOT NULL," +
+		"lastChanged DATETIME NOT NULL," +
+		"categoryPath NVARCHAR(1000) NOT NULL," +
+		"categoryId INTEGER NULL" +
+		");")
+	return err
 }