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SQLiteHelper.cs
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SQLiteHelper.cs
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using System;
using System.Collections.Generic;
using System.Text;
using SQLite;
using System.Threading.Tasks;
using DegreePlanner.Classes;
using System.Data;
using System.Collections.ObjectModel;
using Xamarin.Forms;
using System.Data.Common;
namespace DegreePlanner
{
public class SQLiteHelper
{
public readonly SQLiteAsyncConnection db;
public Task<List<CourseBlueprint>> courses;
public CourseBlueprint course;
public SQLiteHelper(string dbPath) {
//establish connection and create tables if the do not already exist:
db = new SQLiteAsyncConnection(dbPath);
db.CreateTableAsync<TermBlueprint>();
db.CreateTableAsync<CourseBlueprint>();
courses = db.Table<CourseBlueprint>().ToListAsync();
//must delete courses first due to foriegn key constraint:
//DeleteAllCourses<CourseBlueprint>();
//DeleteAllItems<TermBlueprint>();
//inserts Demo data:
//termInsertMethod();
}
//TERMS CRUD*********************************************
public Task<int> DeleteAllItems<T>(){
return db.DeleteAllAsync<TermBlueprint>();
}
public Task<int> CreateTerm(TermBlueprint term){
return db.InsertAsync(term);
}
public Task<List<TermBlueprint>>ReadTerms(){
return db.Table<TermBlueprint>().ToListAsync();
}
public Task <int> UpdateTerm(TermBlueprint term){
return db.UpdateAsync(term);
}
public Task <int> DeleteTerm(TermBlueprint term){
return db.DeleteAsync(term);
}
public Task <int> CountTerms(){
return db.ExecuteAsync("select count(*) from TermBlueprint;");
}
//COURSES CRUD*********************************************
public Task<int> CreateCourse(CourseBlueprint course){
return db.InsertAsync(course);
}
public Task<List<CourseBlueprint>>ReadCourses(TermBlueprint term){
return db.Table<CourseBlueprint>().Where(courses => courses.TermFK_Id == term.Id).ToListAsync();
}
public Task <int> UpdateCourses(CourseBlueprint course){
return db.UpdateAsync(course);
}
//delete a specifc course
public Task <int> DeleteCourse(CourseBlueprint course){
return db.DeleteAsync(course);
}
//delete "ASSOCIATED" courses:
public Task <int> DeleteSpecificCourse(TermBlueprint term){
return db.ExecuteAsync("delete from CourseBlueprint where TermFK_Id = " + term.Id + ";");
}
//delete all courses:
public Task<int> DeleteAllCourses<T>(){
return db.DeleteAllAsync<CourseBlueprint>();
}
public Task<List<CourseBlueprint>>FindAssessments(TermBlueprint term){
return db.Table<CourseBlueprint>().Where(courses => courses.PerfNotify == true).ToListAsync();
}
public Task<List<CourseBlueprint>>ReadAllCourses(){
return db.Table<CourseBlueprint>().ToListAsync();
}
}
}