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Some methods like ExecuteDataTableAsync/ExecuteDataSetAsync call Task.Run unnecessarily. This should be removed.

Current DataReaderConverter uses System.Convert for type conversions, which doesn't handle nullable types.

It also needs a better converter that can handle other values that comes from databases, including DBNull.

Hi, awesome work!
does nvivo dbhelps support this like following ?
"select * from (select 1 as Id union all select 2 union all select 3) as X where Id in @Ids",

Please help a noob, I was trying to make a command

var command = DbHelper.CreateCommand(@"INSERT INTO secApp(AppExe,AppDes) VALUES(@appexe,@Appdes)");

then, I try to use an DbHelper.ExecuteNonQuery with erros,

Would you mind writing an example?

ExecuteDataTable(command) throws ArgumentException: invalid -1 for maxRecords.

I would like to perform queries in transaction/ 1 connection, but ExecuteObject automatically closes connection. In case of provided connection, methoud should not close connection itself:

This works:
using (var connection = db.CreateConnection()) {
connection.Open();
db.ExecuteNonQuery(..., connection);
db.ExecuteNonQuery(..., connection);
db.ExecuteNonQuery(..., connection);
}

But this not:
using (var connection = db.CreateConnection()) {
connection.Open();
db.ExecuteObject(..., connection);
db.ExecuteObject(..., connection); // connection closed exception
db.ExecuteObject(..., connection);
}

Cause: CommandBehavior.CloseConnection in ExecuteReader method

Hello there,

Thanks for the code...

Is there support for transactions?

Regards.

Josep

I tried using the DBHelper with the following:

_sourceDB = new DBHelper("Source");

here is the connection string defined
<add name="Source" connectionString="data source=workstation;initial catalog=MCQ;integrated security=True;multipleactiveresultsets=True;" providerName="System.Data.SqlClient" />

and it keeps giving error
Connection not initialized

Today, DbDataReader exposes some methods like GetInt32(int) that allows fast data retrieval, but requires extra steps to check for DBNulls. It also doesn't provide methods to retrieve nullables neither handles field names, only ordinals.

class User {
    public string Name { get; set; }
    public int? Age { get; set; }
}

var user = db.ExecuteList("select name, age from users", r => new User {
    Name = r.IsDBNull(0) ? null : r.GetString(0),
    Age = r.IsDBNull(1) ? null : r.GetInt32(1)
});

DBConvert provides easier conversion methods, but the extra method call and method names like "ToNullableDateTimeOffset" makes the code a little bit harder to read.

var user = db.ExecuteList("select name, age from users", r => new User {
    Name = DBConvert.ToNullableInt32(r[0]),
    Age = DBConvert.ToString(r[1])
});

With extension methods, there could be a syntax like:

Name = reader.Get<string>(0);
Age = reader.Get<int?>(1);

Name = reader.Get<string>("name");
Age = reader.Get<int?>("age");

This would call the corresponding DBConvert method if needed.

how to execute Add、Delete and Update methods ?

Any full source code real application using dbhelpers with good patterns and practices ? code in production ?

A question, Why not Dapper ?

https://github.com/StackExchange/dapper-dot-net

Stackoverflow sites uses Dapper.

Thx

All commands accept (DbCommand, DbConnection), but the ones accepting strings do not accept DbConnections. Need to add overloads for that.

I'm trying to load List by using:
ExecuteList() from my database and it filled my result with 0 instead of 542496808.
My select would return only it: { ID: 542496808 }

i'm not find code about execute store procedure in readme.txt,can u write it?thank u.