254 lines
9.0 KiB
C#
254 lines
9.0 KiB
C#
using Dapper;
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using DBWizard.Models;
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using System;
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using System.Collections.Generic;
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using System.Configuration;
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using System.Data;
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using System.Data.SQLite;
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using System.Linq;
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namespace DBWizard
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{
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class SqliteDataAccess
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{
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#region student
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// ***************** Create *****************
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/* Inserts a new student to the SQL database.
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* INPUT: student
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* OUTPUT: new row to SQL database, null to program.
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*/
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internal void InsertNewStudent(Student stu)
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{
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using (IDbConnection cnn = new SQLiteConnection(LoadConnectionString()))
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{
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string strQuery = "INSERT INTO STUDENTS (student_id, parent_id, FirstName, LastName, DOB, gender, address, program_id, school_id, GradeLevel, photo)" +
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"VALUES (@student_id, @parent_id, @FirstName, @LastName, @DOB, @gender, @address, @program_id, @school_id, @GradeLevel, @photo)";
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cnn.Execute(strQuery, stu);
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}
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}
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// ***************** Read *****************
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/* Gets a list of all students with the provided last name as equality.
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* INPUT: String last name
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* OUTPUT List<Student>
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*/
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public List<Student> FindStudentByLastname(string last_name)
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{
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//A using statement protects us as a failsafe: it guarantees the connection to the
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//database will be closed, even in event of an application or computer crash.
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using (IDbConnection cnn = new SQLiteConnection(LoadConnectionString()))
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{
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string strQuery = "SELECT * FROM students WHERE LastName=@LastName";
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var output = cnn.Query<Student>(strQuery, new { LastName = last_name });
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return output.ToList();
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}
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}
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/* Gets a single student from the db given the db id field.
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* This function is also usedl used in delete functionality of Form1.cs
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* INPUT: integer database id
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* OUTPUT: student
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*/
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public Student GetStudentByDbID(int dbid_in)
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{
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using (IDbConnection cnn = new SQLiteConnection(LoadConnectionString()))
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{
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string strQuery = "SELECT * FROM students WHERE id=@id";
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var stu_out = cnn.Query<Student>(strQuery, new { id = dbid_in }).Single();
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return stu_out;
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}
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}
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//Can also be used for search function, but currently unused.
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//TODO: cleanup if we decide not to use this.
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public List<Student> FindStudentByStudentId(string studentid_in)
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{
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using (IDbConnection cnn = new SQLiteConnection(LoadConnectionString()))
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{
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string strQuery = "SELECT * FROM students WHERE student_id=@studentid";
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var output = cnn.Query<Student>(strQuery, new { studentid = studentid_in });
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return output.ToList();
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}
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}
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// ***************** Update *****************
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/* Updates an individual student in the DB.
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* Needs to do field mapping in the Execute call because
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* the photo field can be null or not null, and
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* the conditional operator can be used to change the query on the fly.
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*
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* INPUT: Student
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* OUTPUT: Data to SQL Database, void to program
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*/
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internal void UpdateStudent(Student stu)
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{
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using (IDbConnection cnn = new SQLiteConnection(LoadConnectionString()))
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{
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string strQuery = "UPDATE Students SET student_id = @student_id, FirstName = @First_Name, LastName = @Last_Name," +
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"DOB = @_dob, Gender = @_gender, Address = @_address, GradeLevel = @Grade_Level, Photo = @_photo " +
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"WHERE id = @_id;";
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cnn.Execute(strQuery, new
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{
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_id = stu.id,
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student_id = stu.student_id,
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First_Name = stu.FirstName,
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Last_Name = stu.LastName,
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_dob = stu.DOB,
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_gender = stu.gender,
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_address = stu.address,
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Grade_Level = stu.GradeLevel,
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_photo = stu.photo ?? null
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});
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}
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}
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// ***************** Delete *****************
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/* Deletes a student record from the database.
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* INPUT: student
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* OUTPUT: void
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*/
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internal void DeleteStudent(Student stu_in)
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{
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//protect query from 0 or negative indexes.
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if (stu_in.id <= 0)
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return;
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using (IDbConnection cnn = new SQLiteConnection(LoadConnectionString()))
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{
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string strQuery = "DELETE FROM STUDENTS WHERE id=@id;";
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cnn.Execute(strQuery, stu_in);
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}
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}
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#endregion
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#region parent
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// ***************** Create *****************
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/* Inserts a new parent.
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* returns parent id as the new row # it just inserted.
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* INPUT: parent
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* OUTPUT: int <new parent db id>
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*/
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internal int InsertNewParent(Parent par)
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{
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using (IDbConnection cnn = new SQLiteConnection(LoadConnectionString()))
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{
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string strQuery = "INSERT INTO PARENTS (FirstName,LastName,PhoneNumber,EmailAddress)" +
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"VALUES (@FirstName,@LastName,@PhoneNumber,@EmailAddress);" +
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"SELECT MAX(parent_id) as parent_id from parents;";
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int parent_id_out = cnn.Query<int>(strQuery, par).Single();
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return parent_id_out;
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}
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}
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// ***************** Read *****************
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/* Gets a single Parent from the db given the parent_id db field.
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* INPUT: int parent_id
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* OUTPUT: Parent
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*/
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public Parent GetParentByID(int parent_id)
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{
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using (IDbConnection cnn = new SQLiteConnection(LoadConnectionString()))
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{
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string strQuery = "SELECT * FROM parents WHERE parent_id=@id;";
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var output = cnn.Query<Parent>(strQuery, new { id = parent_id });
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var parList = output.ToList();
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Parent parent = parList[0];
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return parent;
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}
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}
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// ***************** Update *****************
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/* Update a parent to the SQL database.
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* Needs to do the mapping as parent_id is not stored on the parent object of the form.
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* but it is stored in the student object if the student is found.
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*
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* INPUT: Parent
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* OUTPUT: Data to SQL database, void to program.
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*/
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internal void UpdateParent(Parent par)
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{
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using (IDbConnection cnn = new SQLiteConnection(LoadConnectionString()))
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{
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string strQuery = "UPDATE Parents SET FirstName = @FirstName, LastName = @LastName," +
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"PhoneNumber = @PhoneNumber, EmailAddress = @EmailAddress " +
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"WHERE parent_id = @parent_id;";
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cnn.Execute(strQuery, par);
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}
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}
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// ***************** Delete *****************
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/* Deletes a parent record from the database.
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* INPUT: Parent
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* OUTPUT: void
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*/
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internal void DeleteParent(Parent par_in)
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{
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//protect query from 0 or negative indexes.
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if (par_in.parent_id <= 0)
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return;
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using (IDbConnection cnn = new SQLiteConnection(LoadConnectionString()))
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{
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string strQuery = "DELETE FROM Parents WHERE parent_id=@parent_id;";
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cnn.Execute(strQuery, par_in);
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}
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}
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#endregion
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#region Misc
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/* Returns the list of available programs from the DB to fill the Programs drop-down.
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* INPUT: no args
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* OUTPUT: List<Program>
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*/
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internal List<Program> GetPrograms()
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{
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using (IDbConnection cnn = new SQLiteConnection(LoadConnectionString()))
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{
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string strQuery = "SELECT name FROM programs;";
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var output = cnn.Query<Program>(strQuery, new DynamicParameters());
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return output.ToList();
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}
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}
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/* Returns the list of available schools from the DB to fill the Schools drop-down.
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* INPUT: no args
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* OUTPUT: List<School>
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*/
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internal List<School> GetSchools()
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{
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using (IDbConnection cnn = new SQLiteConnection(LoadConnectionString()))
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{
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string strQuery = "SELECT name FROM schools;";
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var output = cnn.Query<School>(strQuery, new DynamicParameters());
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return output.ToList();
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}
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}
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#endregion
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private static string LoadConnectionString(string id = "Default")
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{
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return ConfigurationManager.ConnectionStrings[id].ConnectionString;
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}
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} //class SqliteDataAccess
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}
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