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using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Collections.Specialized;
using System.Data.SqlClient;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Tango.PPC.Shared.SQL
{
/// <summary>
/// Represents remote database query result composed of rows and columns.
/// </summary>
/// <example>
/// <para>
/// <i>
/// The following example demonstrates how to set the connected machine's demo state and query for the connected machine's jobs.
/// </i>
/// </para>
/// <code lang="C#" source="../Tango.FSE.Procedures/Examples/Sql/Program.cs" title="Remote SQL" region="Example" />
/// </example>
public class RemoteSqlDataSet
{
/// <summary>
/// Gets or sets the dataset columns.
/// </summary>
public RemoteSqlColumnCollection Columns { get; set; }
private ObservableCollection<RemoteSqlRow> _rows;
/// <summary>
/// Gets or sets the dataset rows.
/// </summary>
public ObservableCollection<RemoteSqlRow> Rows
{
get { return _rows; }
set { _rows = value; OnRowsChanged(); }
}
/// <summary>
/// Initializes a new instance of the <see cref="RemoteSqlDataSet"/> class.
/// </summary>
public RemoteSqlDataSet()
{
Columns = new RemoteSqlColumnCollection();
Rows = new ObservableCollection<RemoteSqlRow>();
}
private void OnRowsChanged()
{
if (Rows != null)
{
Rows.CollectionChanged -= Rows_CollectionChanged;
Rows.CollectionChanged += Rows_CollectionChanged;
InitRows();
}
}
private void Rows_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
InitRows();
}
private void InitRows()
{
if (Rows != null)
{
foreach (var row in Rows.ToList())
{
row.Init(
(key) =>
{
return row.Values[Columns.GetIndexOf(key)];
},
(index) =>
{
return row.Values[index];
});
}
}
}
/// <summary>
/// Creates a new <see cref="RemoteSqlDataSet"/> using the specified <see cref="SqlDataReader"/>.
/// </summary>
/// <param name="reader">The reader.</param>
/// <returns></returns>
public static Task<RemoteSqlDataSet> Load(SqlDataReader reader)
{
return Task.Factory.StartNew<RemoteSqlDataSet>(() =>
{
bool columnsRead = false;
RemoteSqlDataSet dataSet = new RemoteSqlDataSet();
try
{
while (reader.Read())
{
RemoteSqlRow row = new RemoteSqlRow();
for (int i = 0; i < reader.FieldCount; i++)
{
if (!columnsRead)
{
dataSet.Columns.Add(new RemoteSqlColumn()
{
Name = reader.GetName(i)
});
}
row.Values.Add(reader.GetValue(i));
}
columnsRead = true;
dataSet.Rows.Add(row);
}
}
finally
{
reader.Close();
}
return dataSet;
});
}
/// <summary>
/// Returns a <see cref="System.String" /> that represents this instance.
/// </summary>
/// <returns>
/// A <see cref="System.String" /> that represents this instance.
/// </returns>
public override string ToString()
{
return String.Join(", ", Columns.Select(x => x.Name)) + "\n" + String.Join(Environment.NewLine, Rows.Select(x => x.ToString()));
}
/// <summary>
/// Formats this dataset as a string with columns and rows.
/// </summary>
/// <returns></returns>
public String ToTableString()
{
Dictionary<int, int> columnsMaxLength = new Dictionary<int, int>();
for (int i = 0; i < Columns.Count; i++)
{
columnsMaxLength.Add(i, Columns[i].Name.Length);
}
foreach (var row in Rows)
{
for (int i = 0; i < row.Values.Count; i++)
{
int valueLength = row.Values[i].ToStringSafe().Length;
if (valueLength > columnsMaxLength[i])
{
columnsMaxLength[i] = valueLength;
}
}
}
String str = String.Empty;
for (int i = 0; i < Columns.Count; i++)
{
str += $"{Columns[i].Name.PadRight(columnsMaxLength[i])}{(i < Columns.Count - 1 ? " | " : "")}";
}
int width = str.Length;
str += Environment.NewLine + String.Empty.PadRight(width, '-');
foreach (var row in Rows)
{
str += Environment.NewLine;
for (int i = 0; i < row.Values.Count; i++)
{
str += $"{row.Values[i].ToStringSafe().PadRight(columnsMaxLength[i])}{(i < Columns.Count - 1 ? " | " : "")}";
}
}
return str;
}
}
}
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