codeql/csharp/ql/test/library-tests/frameworks/sql/sql.cs

using System;

namespace System.Data
{
    public interface IDbCommand
    {
        string CommandText { get; set; }
    }

    public interface IDbDataAdapter { }
}

namespace System.Data.SqlClient
{
    public class SqlCommand : IDbCommand
    {
        public SqlCommand(string commandText) { }

        string IDbCommand.CommandText { get; set; }
    }

    public class SqlDataAdapter : IDbDataAdapter
    {
        public SqlDataAdapter() { }

        public SqlDataAdapter(string sql) { }
    }
}

namespace MySql.Data.MySqlClient
{
    using System.Data;

    public class MySqlCommand : IDbCommand
    {
        public MySqlCommand(string commandText) { }

        public string CommandText { get; set; }
    }

    public class MySqlHelper
    {
        public static object ExecuteScalar(string connectionString, string commandText) { return null; }
    }
}

namespace Microsoft.ApplicationBlocks.Data
{
    class SqlHelper
    {
        public static object ExecuteScalar(string connectionString, string commandText) { return null; }
    }
}

namespace SqlClientTests
{
    using System.Data;
    using System.Data.SqlClient;
    using MySql.Data.MySqlClient;
    using Microsoft.ApplicationBlocks.Data;

    class TestClass
    {
        public static void TestMethod(string text)
        {
            System.Data.IDbCommand command = new SqlCommand(text);
            command = new MySqlCommand(text);
            command.CommandText = text;
            new MySqlCommand(text).CommandText = text;
            new SqlDataAdapter(text);
            MySqlHelper.ExecuteScalar("", text);
            SqlHelper.ExecuteScalar("", text);
        }
    }
}