dbwizard/SqliteDataAccess.cs

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C#
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using Dapper;
using DBWizard.Models;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Data.SQLite;
using System.Linq;
namespace DBWizard
{
class SqliteDataAccess
{
public List<Student> FindStudentByLastname(string last_name)
{
//A using statement protects us as a failsafe: it guarantees the connection to the
//database will be closed, even in event of an application or computer crash.
using (IDbConnection cnn = new SQLiteConnection(LoadConnectionString()))
{
string strQuery = "SELECT * FROM students WHERE LastName=@LastName";
var output = cnn.Query<Student>(strQuery, new { LastName = last_name });
return output.ToList();
}
}
//Can also be used for search function.
public List<Student> FindStudentByStudentId(string studentid_in)
{
using (IDbConnection cnn = new SQLiteConnection(LoadConnectionString()))
{
string strQuery = "SELECT * FROM students WHERE student_id=@studentid";
var output = cnn.Query<Student>(strQuery, new { studentid = studentid_in });
return output.ToList();
}
}
internal void UpdateStudent(Student stu)
{
using (IDbConnection cnn = new SQLiteConnection(LoadConnectionString()))
{
string strQuery = "UPDATE Students SET student_id = @student_id, FirstName = @First_Name, LastName = @Last_Name," +
"DOB = @_dob, Gender = @_gender, Address = @_address, GradeLevel = @Grade_Level, Photo = @_photo" +
"WHERE id = @_id;";
cnn.Execute(strQuery, new
{
_id = stu.id,
student_id = stu.student_id,
First_Name = stu.FirstName,
Last_Name = stu.LastName,
_dob = stu.DOB,
_gender = stu.gender,
_address = stu.address,
Grade_Level = stu.GradeLevel,
_photo = stu.photo ?? null
});
}
}
internal void InsertNewStudent(Student stu)
{
using (IDbConnection cnn = new SQLiteConnection(LoadConnectionString()))
{
string strQuery = "INSERT INTO STUDENTS (student_id, parent_id, FirstName, LastName, DOB, gender, address, program_id, school_id, GradeLevel, photo)" +
"VALUES (@student_id, @parent_id, @FirstName, @LastName, @DOB, @gender, @address, @program_id, @school_id, @GradeLevel, @photo)";
cnn.Execute(strQuery, stu);
}
}
/* Inserts a new parent.
* returns parent id as the new row # it just inserted.
*/
internal int InsertNewParent(Parent par)
{
using (IDbConnection cnn = new SQLiteConnection(LoadConnectionString()))
{
string strQuery = "INSERT INTO PARENTS (FirstName,LastName,PhoneNumber,EmailAddress)" +
"VALUES (@FirstName,@LastName,@PhoneNumber,@EmailAddress);";
var affectedRow = cnn.Execute(strQuery, par);
return affectedRow;
}
}
internal void UpdateParent(Parent par, int parent_id_in)
{
using (IDbConnection cnn = new SQLiteConnection(LoadConnectionString()))
{
string strQuery = "UPDATE Parents SET FirstName = @First_Name, LastName = @Last_Name," +
"PhoneNumber = @Phone_Number, EmailAddress = @Email_Address" +
"WHERE parent_id = @_id;";
cnn.Execute(strQuery, new
{
_id = parent_id_in,
First_Name = par.FirstName,
Last_Name = par.LastName,
Phone_Number = par.PhoneNumber,
Email_Address = par.EmailAddress
});
}
}
internal List<Program> GetPrograms()
{
using (IDbConnection cnn = new SQLiteConnection(LoadConnectionString()))
{
string strQuery = "SELECT name FROM programs;";
var output = cnn.Query<Program>(strQuery, new DynamicParameters());
return output.ToList();
}
}
internal List<School> GetSchools()
{
using (IDbConnection cnn = new SQLiteConnection(LoadConnectionString()))
{
string strQuery = "SELECT name FROM schools;";
var output = cnn.Query<School>(strQuery, new DynamicParameters());
return output.ToList();
}
}
public Parent GetParentByID(int parent_id)
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{
using (IDbConnection cnn = new SQLiteConnection(LoadConnectionString()))
{
string strQuery = "SELECT * FROM parents WHERE parent_id=@id;";
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var output = cnn.Query<Parent>(strQuery, new { id = parent_id });
var parList = output.ToList();
Parent parent = parList[0];
return parent;
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}
}
private static string LoadConnectionString(string id = "Default")
{
return ConfigurationManager.ConnectionStrings[id].ConnectionString;
}
} //class SqliteDataAccess
}