Add: put tag on file

pkg/database/method_tag_and_file.go

@@ -0,0 +1,25 @@
+package database
+
+func (database *Database) PutTagOnFile(tagID, fileID, userID int64) error {
+	_, err := database.stmt.putTagOnFile.Exec(tagID, fileID, userID)
+	return err
+}
+
+func (database *Database) GetTagsOnFile(fileID int64) ([]*Tag, error) {
+	rows, err := database.stmt.getTagsOnFile.Query(fileID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	tags := make([]*Tag, 0)
+	for rows.Next() {
+		tag := &Tag{}
+		err = rows.Scan(&tag.ID, &tag.Name, &tag.Description, &tag.CreatedByUserId)
+		if err != nil {
+			return nil, err
+		}
+		tags = append(tags, tag)
+	}
+	return tags, nil
+}

pkg/database/sql_stmt.go

@@ -190,6 +190,14 @@ JOIN users ON tags.created_by_user_id = users.id
 
 var updateTagQuery = `UPDATE tags SET name = ?, description = ? WHERE id = ?;`
 
+var putTagOnFileQuery = `INSERT INTO file_has_tag (tag_id, file_id, user_id) VALUES (?, ?, ?);`
+
+var getTagsOnFileQuery = `SELECT
+tags.id, tags.name, tags.description, tags.created_by_user_id
+FROM file_has_tag
+JOIN tags ON file_has_tag.tag_id = tags.id
+WHERE file_has_tag.file_id = ?;`
+
 type Stmt struct {
 	initFilesTable     *sql.Stmt
 	initFoldersTable   *sql.Stmt
@@ -226,6 +234,8 @@ type Stmt struct {
 	getTag             *sql.Stmt
 	getTags            *sql.Stmt
 	updateTag          *sql.Stmt
+	putTagOnFile       *sql.Stmt
+	getTagsOnFile      *sql.Stmt
 }
 
 func NewPreparedStatement(sqlConn *sql.DB) (*Stmt, error) {
@@ -506,5 +516,17 @@ func NewPreparedStatement(sqlConn *sql.DB) (*Stmt, error) {
 		return nil, err
 	}
 
+	// init putTagOnFile
+	stmt.putTagOnFile, err = sqlConn.Prepare(putTagOnFileQuery)
+	if err != nil {
+		return nil, err
+	}
+
+	// init getTagsOnFile
+	stmt.getTagsOnFile, err = sqlConn.Prepare(getTagsOnFileQuery)
+	if err != nil {
+		return nil, err
+	}
+
 	return stmt, err
 }