public List <UserDataCollection> GetUser(string userID)
{
List <UserDataCollection> User = new List <UserDataCollection>();
string connectionString = "Host=localhost; Username=postgres; Password=Rupom@223456; Database=postgres";
// initializing a new instance of NpgSqlConnection with connection string
var Connection = new NpgsqlConnection(connectionString);
Connection.Open();
try
{
// request a function to execute against PostgreeSql
var command = new NpgsqlCommand();
// get the sql connection
command.Connection = Connection;
command.CommandText = "SELECT * FROM \"Test\" WHERE name = '" + userID + "'; ";
command.ExecuteNonQuery();
NpgsqlDataReader dr = command.ExecuteReader();
while (dr.Read())
{
UserDataCollection userInfo = new UserDataCollection();
userInfo.age = dr[0].ToString();
userInfo.id = dr[2].ToString();
userInfo.name = dr[1].ToString();
User.Add(userInfo);
}
dr.Close();
}
catch
{
}
finally
{
}
return(User);
//return "Salary of " + userID + " is " + 4000;
}
public ServerResponse PostData(UserDataCollection userDetails)
{
// connection string
string connectionString = "Host=localhost; Username=postgres; Password=Rupom@223456; Database=postgres";
// initializing a new instance of NpgSqlConnection with connection string
var Connection = new NpgsqlConnection(connectionString);
Connection.Open();
// assigning members of DataCollection to local variable
string id = userDetails.id;
string name = userDetails.name;
string age = userDetails.age;
try
{
// request a function to execute against PostgreeSql
var command = new NpgsqlCommand();
// get the sql connection
command.Connection = Connection;
// setting the sql statement or query which need to executed
command.CommandText = "INSERT INTO \"Test\" VALUES('" + id + "', '" + name + "', ' " + age + "');";
// execute the SQL query against the connection and returns the no of row affected
command.ExecuteNonQuery();
}
catch
{
// this massage will appears if some error encountered during the try block execution
MessageBox.Show("Error encountered during INSERT operation.");
}
finally
{
// once the process of posting is done we will close the connection
Connection.Close();
}
// Server will send this response to the client once this method executed succesfully
return(new ServerResponse(200, "Value stored into the database"));
}
public ServerResponse PutData(UserDataCollection userDetails)
{
string ConnectionString = "Host=localhost; Username=postgres; Password=Rupom@223456; Database=postgres";
// initializing a npgsqlConnection with the connection string
var Connection = new NpgsqlConnection(ConnectionString);
// initiate the connection
Connection.Open();
// assigning the datamembers of the UserDataCollection to local varibale
string id = userDetails.id;
string name = userDetails.name;
string age = userDetails.age;
try
{
// request a function to execute against postgresql
var command = new NpgsqlCommand();
// get the sql connection
command.Connection = Connection;
// setting the sql query to be executed
command.CommandText = "UPDATE \"Test\" SET \"id\" = '" + id + "', \"name\" = '" + name + "', \"age\" = '" + age + "' WHERE \"id\" = '" + id + "';";
// after executing the query against connection return the no of affected rows in the postgre table
command.ExecuteNonQuery();
}
catch
{
// for any error during try block this message will appear
MessageBox.Show("Error encountered during UPDATE operation.");
}
finally
{
// close the conection after executig the process
Connection.Close();
}
// return the following perameters if the method executed fuccesfully
return(new ServerResponse(200, "Value updated in the database"));
}
