Implemented getting all categories.

pkg/mindflow/database/sqlite/db.go

@@ -16,6 +16,8 @@ var (
 
 	//go:embed queries/categoryById.sql
 	queryCategoryById string
+	//go:embed queries/categoryGetAll.sql
+	queryCategoryGetAll string
 	//go:embed queries/categoryNew.sql
 	queryCategoryNew string
 	//go:embed queries/postGetAll.sql
@@ -30,6 +32,7 @@ var (
 
 var (
 	stmtCategoryById   *sql.Stmt
+	stmtCategoryGetAll *sql.Stmt
 	stmtCategoryNew    *sql.Stmt
 	stmtPostGetAll     *sql.Stmt
 	stmtPostNew        *sql.Stmt
@@ -50,6 +53,11 @@ func initDBStatements(db *sql.DB) error {
 		return errors.Wrap(err, "failed to prepare queryCategoryById")
 	}
 
+	stmtCategoryGetAll, err = db.Prepare(queryCategoryGetAll)
+	if err != nil {
+		return errors.Wrap(err, "failed to prepare queryCategoryGetAll")
+	}
+
 	stmtCategoryNew, err = db.Prepare(queryCategoryNew)
 	if err != nil {
 		return errors.Wrap(err, "failed to prepare queryCategoryNew")
@@ -185,6 +193,34 @@ func (s *SQLiteMindflow) Posts() (posts []mindflow.Post, err error) {
 	return posts, nil
 }
 
+func (s *SQLiteMindflow) Categories() (categories []mindflow.Category, err error) {
+	tx, err := s.db.Begin()
+	if err != nil {
+		return nil, err
+	}
+	defer tx.Rollback()
+
+	rows, err := tx.Stmt(stmtCategoryGetAll).Query()
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	for rows.Next() {
+		var category mindflow.Category
+
+		if err = rows.Scan(&category.ID, &category.Name); err != nil {
+			return nil, err
+		}
+
+		categories = append(categories, category)
+	}
+
+	tx.Commit()
+
+	return categories, nil
+}
+
 func (s *SQLiteMindflow) NewCategory(name string) (int64, error) {
 	tx, err := s.db.Begin()
 	if err != nil {

pkg/mindflow/database/sqlite/queries/categoryGetAll.sql

@@ -0,0 +1,4 @@
+SELECT
+    `category_id`,
+    `name`
+  FROM `category`;

pkg/mindflow/mindflow.go

@@ -5,6 +5,7 @@ type Mindflow interface {
 	Edit(post *Post) error
 	Delete(id int64) error
 	Posts() ([]Post, error)
+	Categories() ([]Category, error)
 	NewCategory(name string) (int64, error)
 	GetCategoryByID(id int64) (string, error)
 	Close() error