// public method AddAgent to insert into database
public static int AddAgent(Agent agent)
{
// establish a connection with the database
SqlConnection connection = TravelExpertsDB.GetConnection();
// insert statement
string insertStatement =
"INSERT INTO Agents " +
"(AgtFirstName, AgtMiddleInitial, AgtLastName, AgtBusPhone, AgtEmail, AgtPosition, AgencyId) " +
"VALUES (@AgtFirstName, @AgtMiddleInitial, @AgtLastName, @AgtBusPhone, @AgtEmail, @AgtPosition, @AgencyId)";
SqlCommand insertCommand =
new SqlCommand(insertStatement, connection);
insertCommand.Parameters.AddWithValue(
"@AgtFirstName", agent.AgtFirstName);
insertCommand.Parameters.AddWithValue(
"@AgtMiddleInitial", agent.AgtMiddleInitial);
insertCommand.Parameters.AddWithValue(
"@AgtLastName", agent.AgtLastName);
insertCommand.Parameters.AddWithValue(
"@AgtBusPhone", agent.AgtBusPhone);
insertCommand.Parameters.AddWithValue(
"@AgtEmail", agent.AgtEmail);
insertCommand.Parameters.AddWithValue(
"@AgtPosition", agent.AgtPosition);
insertCommand.Parameters.AddWithValue(
"@AgencyId", agent.AgencyId);
// try to catch exceptions
try
{
// open the connection
connection.Open();
insertCommand.ExecuteNonQuery();
string selectStatement =
"SELECT IDENT_CURRENT('Agents') FROM Agents";
SqlCommand selectCommand =
new SqlCommand(selectStatement, connection);
int agentId = Convert.ToInt32(selectCommand.ExecuteScalar());
return agentId;
}
// catch exceptions and throw it the form to handle
catch (SqlException ex)
{
throw ex; // throw the exception; let the form handle it cause we are in a data access class
}
finally
{
connection.Close(); // close the connection
}
}
// public method to delete Agent
public static bool DeleteAgent(Agent agent)
{
SqlConnection connection = TravelExpertsDB.GetConnection();
string deleteStatement =
"DELETE FROM Agents " +
"WHERE AgtFirstName = @AgtFirstName " +
"AND AgtMiddleInitial = @AgtMiddleInitial " +
"AND AgtLastName = @AgtLastName " +
"AND AgtBusPhone = @AgtBusPhone " +
"AND AgtEmail = @AgtEmail " +
"AND AgtPosition = @AgtPosition " +
"AND AgencyId = @AgencyId";
SqlCommand deleteCommand =
new SqlCommand(deleteStatement, connection);
deleteCommand.Parameters.AddWithValue(
"@AgtFirstName", agent.AgtFirstName);
deleteCommand.Parameters.AddWithValue(
"@AgtMiddleInitial", agent.AgtMiddleInitial);
deleteCommand.Parameters.AddWithValue(
"@AgtLastName", agent.AgtLastName);
deleteCommand.Parameters.AddWithValue(
"@AgtBusPhone", agent.AgtBusPhone);
deleteCommand.Parameters.AddWithValue(
"@AgtEmail", agent.AgtEmail);
deleteCommand.Parameters.AddWithValue(
"@AgtPosition", agent.AgtPosition);
deleteCommand.Parameters.AddWithValue(
"@AgencyId", agent.AgencyId);
try
{
connection.Open();
int count = deleteCommand.ExecuteNonQuery();
if (count > 0)
return true;
else
return false;
}
catch (SqlException ex)
{
throw ex;
}
finally
{
connection.Close();
}
}
// make public method GetAgentId
public static Agent GetAgentId(int agentId)
{
// establish a connection with the database
SqlConnection connection = TravelExpertsDB.GetConnection();
// create select statement to select from the database
string selectStatement =
"SELECT AgentId, AgtFirstName, " +
"AgtMiddleInitial, AgtLastName, " +
"AgtBusPhone, AgtEmail, " +
"AgtPosition, AgencyId " +
"FROM Agents " +
"WHERE AgentId = @AgentId";
SqlCommand selectCommand =
new SqlCommand(selectStatement, connection);
selectCommand.Parameters.AddWithValue("@AgentId", agentId);
// try to catch exceptions
try
{
// open the connection
connection.Open();
SqlDataReader reader =
selectCommand.ExecuteReader(CommandBehavior.SingleRow); // only one row; resolve CommandBehavior
if (reader.Read()) // there is a row
{
// process the row
Agent agent = new Agent();
agent.AgentId = Convert.ToInt32(reader["AgentId"]);
agent.AgtFirstName = reader["AgtFirstName"].ToString();
agent.AgtMiddleInitial = reader["AgtMiddleInitial"].ToString();
agent.AgtLastName = reader["AgtLastName"].ToString();
agent.AgtBusPhone = reader["AgtBusPhone"].ToString();
agent.AgtEmail = reader["AgtEmail"].ToString();
agent.AgtPosition = reader["AgtPosition"].ToString();
agent.AgencyId = Convert.ToInt32(reader["AgencyId"]);
return agent;
}
else // no agent
{
return null;
}
}
catch (SqlException ex)
{
throw ex; // throw the exception for the form to handle
}
finally
{
connection.Close();
}
}
// public method EditAgent
public static bool EditAgent(Agent oldAgent, Agent newAgent)
{
// establish a connection with the database
SqlConnection connection = TravelExpertsDB.GetConnection();
string updateStatement =
"UPDATE Agents SET " +
"AgtFirstName = @NewAgtFirstName, " +
"AgtMiddleInitial = @NewAgtMiddleInitial, " +
"AgtLastName = @NewAgtLastName, " +
"AgtBusPhone = @NewAgtBusPhone, " +
"AgtEmail = @NewAgtEmail, " +
"AgtPosition = @NewAgtPosition, " +
"AgencyId = @NewAgencyId " +
"WHERE AgtFirstName = @OldAgtFirstName " +
"AND AgtMiddleInitial = @OldAgtMiddleInitial " +
"AND AgtLastName = @OldAgtMiddleInitial " +
"AND AgtBusPhone = @OldAgtBusPhone " +
"AND AgtEmail = @OldAgtEmail " +
"AND AgtPosition = @OldAgtPosition " +
"AND AgencyId = @OldAgencyId";
// update command for new and old product
SqlCommand updateCommand =
new SqlCommand(updateStatement, connection);
updateCommand.Parameters.AddWithValue(
"@NewAgtFirstName", newAgent.AgtFirstName);
updateCommand.Parameters.AddWithValue(
"@NewAgtMiddleInitial", newAgent.AgtMiddleInitial);
updateCommand.Parameters.AddWithValue(
"@NewAgtLastName", newAgent.AgtLastName);
updateCommand.Parameters.AddWithValue(
"@NewAgtBusPhone", newAgent.AgtBusPhone);
updateCommand.Parameters.AddWithValue(
"@NewAgtEmail", newAgent.AgtEmail);
updateCommand.Parameters.AddWithValue(
"@NewAgtPosition", newAgent.AgtPosition);
updateCommand.Parameters.AddWithValue(
"@NewAgencyId", newAgent.AgencyId);
updateCommand.Parameters.AddWithValue(
"@OldAgtFirstName", oldAgent.AgtFirstName);
updateCommand.Parameters.AddWithValue(
"@OldAgtMiddleInitial", oldAgent.AgtMiddleInitial);
updateCommand.Parameters.AddWithValue(
"@OldAgtLastName", oldAgent.AgtLastName);
updateCommand.Parameters.AddWithValue(
"@oldAgtBusPhone", oldAgent.AgtBusPhone);
updateCommand.Parameters.AddWithValue(
"@oldAgtEmail", oldAgent.AgtEmail);
updateCommand.Parameters.AddWithValue(
"@oldAgtPosition", oldAgent.AgtPosition);
updateCommand.Parameters.AddWithValue(
"@OldAgencyId", oldAgent.AgencyId);
// try for exceptions
try
{
// open connection
connection.Open();
int count = updateCommand.ExecuteNonQuery();
if (count > 0)
return true;
else
return false;
}
// throw an exception to the form to handle
catch (SqlException ex)
{
throw ex;
}
finally
{
connection.Close(); // close the connection string
}
}