//Create
public static bool AddChurch(Church objChurch)
{
//these are our variables to be used
int rowsAffected = 0;
NpgsqlConnection conn = null;
NpgsqlCommand command = null;
string sqlQuery;
try
{
//using allows the program to shut the connection so that it's not constantly attatched to the database
using (conn = AccessData.GetConnection())
{
//open the connection to the database
conn.Open();
//this is where the SQL query to the database will be put in. the parameters ie '@ind_num' must match
// the table's column names to work properly
sqlQuery = "INSERT into church values (@chu_num, @chu_fname, @chu_lname)";
using (command = new NpgsqlCommand(sqlQuery, conn))
{
//this command will replace the parameter in the query string with the individual object's corresponding
// property
command.Parameters.AddWithValue("@chu_num", objChurch.ID);
command.Parameters.AddWithValue("@chu_fname", objChurch.FirstName);
command.Parameters.AddWithValue("@chu_lname", objChurch.LastName);
//this is essentially our "did it work" kind of check
rowsAffected = command.ExecuteNonQuery();
}
//if rows affected is greater than 0, then we know data was put into the database
if (rowsAffected > 0)
{
return(true);
}
else
{
return(false);
}
}
}
catch (Exception ex)
{
MessageBox.Show("Error: " + ex.Message);
throw ex;
}
finally
{
//Failsafe to make sure that the Database Connection is closed
if (conn != null)
{
conn.Close();
}
}
}
//Update
public static bool UpdateChurch(Church objChurch)
{
int rowsAffected = 0;
NpgsqlConnection conn = null;
NpgsqlCommand command = null;
string sqlQuery;
try
{
using (conn = AccessData.GetConnection())
{
conn.Open();
//the UPDATE syntax will be used in this case, and the format will match SQL query format so each
// column on a new line for clarity
sqlQuery = "UPDATE church" + Environment.NewLine +
"set firstname = @chu_fname" + Environment.NewLine +
"lastname = @chu_lname" + Environment.NewLine +
"WHERE id = @chu_num";
using (command = new NpgsqlCommand(sqlQuery, conn))
{
command.Parameters.AddWithValue("@chu_num", objChurch.ID);
command.Parameters.AddWithValue("@chu_fname", objChurch.FirstName);
command.Parameters.AddWithValue("@chu_lname", objChurch.LastName);
rowsAffected = command.ExecuteNonQuery();
}
if (rowsAffected > 0)
{
return(true);
}
else
{
return(false);
}
}
}
catch (Exception ex)
{
MessageBox.Show("Error: " + ex.Message);
throw ex;
}
finally
{
if (conn != null)
{
conn.Close();
}
}
}
//Read
public static Church GetChurch(int chu_Num)
{
Church objChurch = null;
NpgsqlConnection conn = null;
NpgsqlCommand command = null;
NpgsqlDataReader reader = null;
string sqlQuery = "SELECT * FROM organization WHERE id = @ind_num";
try
{
using (conn = AccessData.GetConnection())
{
conn.Open();
using (command = new NpgsqlCommand(sqlQuery, conn))
{
command.Parameters.AddWithValue("@chu_num", chu_Num);
using (reader = command.ExecuteReader())
{
while (reader.Read())
{
//inside the square brackets, the field must match the database perfectly for the reader to work
objChurch = new Church();
objChurch.ID = reader["id"].ToString();
objChurch.FirstName = reader["first_name"].ToString();
objChurch.LastName = reader["last_name"].ToString();
}
}
}
}
return(objChurch);
}
catch (Exception ex)
{
MessageBox.Show("Error: " + ex.Message);
throw;
}
finally
{
if (conn != null)
{
conn.Close();
}
}
}
//Delete
public static bool DeleteChurch(Church objChurch)
{
int rowsAffected = 0;
NpgsqlConnection conn = null;
NpgsqlCommand command = null;
string sqlQuery;
try
{
using (conn = AccessData.GetConnection())
{
conn.Open();
//DELETE syntax is much simpler, we only need to find the selected ID and delete it
sqlQuery = "DELETE church WHERE id = @ind_num";
using (command = new NpgsqlCommand(sqlQuery, conn))
{
command.Parameters.AddWithValue("@chu_num", objChurch.ID);
command.Parameters.AddWithValue("@chu_fname", objChurch.FirstName);
command.Parameters.AddWithValue("@chu_lname", objChurch.LastName);
rowsAffected = command.ExecuteNonQuery();
}
if (rowsAffected > 0)
{
return(true);
}
else
{
return(false);
}
}
}
catch (Exception ex)
{
MessageBox.Show("Error: " + ex.Message);
throw ex;
}
finally
{
if (conn != null)
{
conn.Close();
}
}
}
//start here
public static List <Church> GetChurch()
{
//this allows us to populate a list of all individuals
List <Church> list = new List <Church>();
NpgsqlConnection conn = null;
NpgsqlCommand command = null;
NpgsqlDataReader reader = null;
string sqlQuery = "SELECT * FROM church ORDER BY id";
try
{
using (conn = AccessData.GetConnection())
{
conn.Open();
using (command = new NpgsqlCommand(sqlQuery, conn))
{
using (reader = command.ExecuteReader())
{
while (reader.Read())
{
//We want to use the constructor from the business object version here, reading each
// of the parameters from the database by putting the column's name in the square brackets
Church objChurch = new Church(reader["id"].ToString(), reader["first_name"].ToString(),
reader["last_name"].ToString(), reader["address"].ToString());
list.Add(objChurch);
}
}
}
}
}
catch (Exception ex)
{
MessageBox.Show("Error: " + ex.Message);
throw;
}
finally
{
}
return(list);
}
