gui/newrecipedialog.cpp

@@ -160,7 +160,7 @@ void NewRecipeDialog::on_removeTagButton_clicked(){
 		return;
 	}
 	RecipeTag tag = this->tags[ui->tagsComboBox->currentIndex()];
-	string content = "Are you sure you wish to delete the following tag:\n"+tag.getValue();
+	string content = "Are you sure you wish to delete the following tag:\n"+tag.getValue()+"\nThis will delete the tag for all recipes that use it.";
 	QMessageBox::StandardButton reply = QMessageBox::question(this, QString("Delete Tag"), QString(content.c_str()));
 	if (reply == QMessageBox::Yes){
 		this->recipeDB->deleteTag(tag);

gui/openrecipedialog.cpp

@@ -22,11 +22,11 @@ OpenRecipeDialog::~OpenRecipeDialog()
 
 void OpenRecipeDialog::populateRecipesTable(){
 	vector<Recipe> recipes = this->recipeDB->retrieveAllRecipes();
-	printf("Found %d recipes:\n", recipes.size());
-	for (Recipe r : recipes){
-		r.print();
-		printf("\n------------------\n");
-	}
+//	printf("Found %d recipes:\n", recipes.size());
+//	for (Recipe r : recipes){
+//		r.print();
+//		printf("\n------------------\n");
+//	}
 	this->recipeTableModel.setRecipes(recipes);
 	ui->recipeTableView->show();
 }

gui/openrecipedialog.ui

@@ -97,6 +97,9 @@
         <property name="sortingEnabled">
          <bool>true</bool>
         </property>
+        <attribute name="verticalHeaderVisible">
+         <bool>false</bool>
+        </attribute>
        </widget>
       </item>
      </layout>

main.cpp

@@ -48,6 +48,9 @@ int main(int argc, char *argv[])
 //		printf("Accepted the dialog.\n");
 //	}
 
+	bool success = recipeDB.deleteRecipe(4);
+	printf("Success: %d\n", success);
+	recipeDB.selectFrom("recipe", "recipeId, name", "").printData();
 	w.loadFromRecipe(recipeDB.retrieveRecipe("Generic Bread"));
 
 	return a.exec();

model/database/database.cpp

@@ -46,6 +46,20 @@ ResultTable Database::selectFrom(string tableName, string columnNames, string co
 	return this->executeSQL(query);
 }
 
+bool Database::deleteFrom(string tableName, string conditions){
+	if (tableName.empty()){
+		return false;
+	}
+	string query = "DELETE FROM " + tableName + " " + conditions + ";";
+	ResultTable t = this->executeSQL(query);
+	if (t.getReturnCode() != SQLITE_DONE){
+		fprintf(stderr, "Can't delete from table %s.Return code: %d\n%s\n", tableName.c_str(), t.getReturnCode(), sqlite3_errmsg(this->db));
+		exit(EXIT_FAILURE);
+	} else {
+		return true;
+	}
+}
+
 void Database::openConnection(){
     this->returnCode = sqlite3_open(this->filename.c_str(), &this->db);
     if (this->returnCode || this->db == NULL){

model/database/database.h

@@ -26,6 +26,7 @@ public:
 	ResultTable executeSQL(string statement);
 	bool insertInto(string tableName, vector<string> columnNames, vector<string> values);
 	ResultTable selectFrom(string tableName, string columnNames, string conditions);
+	bool deleteFrom(string tableName, string conditions);
 
 	bool tableExists(string tableName);
 	int getLastInsertedRowId();

model/database/recipedatabase.cpp

@@ -5,6 +5,12 @@ RecipeDatabase::RecipeDatabase(string filename) : Database(filename){
 }
 
 bool RecipeDatabase::storeRecipe(Recipe recipe){
+	//Some primary checks to avoid garbage in the database.
+	if (recipe.getName().empty() ||
+			recipe.getInstruction().getHTML().empty() ||
+			recipe.getIngredients().empty()){
+		return false;
+	}
 	//Store a recipe, if it doesn't already exist. This first tries to create the recipe entry, then all subsequent supporting table entries.
 	this->executeSQL("BEGIN;");
 	ResultTable t = this->selectFrom("recipe", "*", "WHERE name="+surroundString(recipe.getName(), "'"));
@@ -233,7 +239,54 @@ vector<RecipeTag> RecipeDatabase::retrieveAllTags(){
 }
 
 bool RecipeDatabase::deleteRecipe(string name){
+	ResultTable t = this->selectFrom("recipe", "recipeId", "WHERE name="+name);
+	if (t.rowCount() != 1){
+		return false;
+	}
+	string recipeId = t.valueAt(0, 0);
+	return this->deleteRecipe(std::stoi(recipeId));
+}
 
+bool RecipeDatabase::deleteRecipe(int recipeId){
+	string idString = std::to_string(recipeId);
+	if (this->selectFrom("recipe", "recipeId", "WHERE recipeId="+idString).isEmpty()){
+		return false;
+	}
+	this->executeSQL("BEGIN;");
+	bool tagsDeleted = this->deleteFrom("recipeTag", "WHERE recipeId="+idString);
+	bool recipeIngredientDeleted = this->deleteFrom("recipeIngredient", "WHERE recipeId="+idString);
+	bool recipeDeleted = this->deleteFrom("recipe", "WHERE recipeId="+idString);
+	if (tagsDeleted && recipeIngredientDeleted && recipeDeleted){
+		this->executeSQL("COMMIT;");
+		return true;
+	} else {
+		this->executeSQL("ROLLBACK;");
+		return false;
+	}
+}
+
+bool RecipeDatabase::deleteIngredient(string name){
+	ResultTable t = this->selectFrom("recipeIngredient", "recipeId", "WHERE ingredientId=("
+																	 "SELECT ingredientId"
+																	 "FROM ingredient"
+																	 "WHERE name="+name+")");
+	if (!t.isEmpty()){
+		//There is at least one recipe dependent on the ingredient.
+		return false;
+	}
+	return this->deleteFrom("ingredient", "WHERE name="+name);
+}
+
+bool RecipeDatabase::deleteUnitOfMeasure(string name){
+	ResultTable t = this->selectFrom("recipeIngredient", "recipeId", "WHERE unitName="+name);
+	if (!t.isEmpty()){
+		return false;
+	}
+	return this->deleteFrom("unitOfMeasure", "WHERE name="+name);
+}
+
+bool RecipeDatabase::deleteTag(RecipeTag tag){
+	return this->deleteFrom("recipeTag", "WHERE tagName="+tag.getValue());
 }
 
 void RecipeDatabase::ensureTablesExist(){

model/database/recipedatabase.h

@@ -41,7 +41,10 @@ class RecipeDatabase : public Database
 
 		//Deletion.
 		bool deleteRecipe(string name);
-		void deleteTag(RecipeTag tag);
+		bool deleteRecipe(int recipeId);
+		bool deleteIngredient(string name);
+		bool deleteUnitOfMeasure(string name);
+		bool deleteTag(RecipeTag tag);
 	private:
 
 		//Utility methods.

model/recipe/recipetablemodel.cpp

@@ -45,8 +45,6 @@ QVariant RecipeTableModel::headerData(int section, Qt::Orientation orientation,
 				return "Name";
 			case 1:
 				return "Created On";
-			case 2:
-
 			default:
 				return QVariant();
 		}