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Zero/ZeroLevel.MsSql/SqlServerEntities/TableInfo.cs

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using System;
using System.Collections.Generic;
using System.Linq;
namespace ZeroLevel.MsSql
{
public abstract class TableInfo : IEquatable<TableInfo>
{
#region Private fields
/// <summary>
/// Имя таблицы
/// </summary>
protected readonly string _name;
/// <summary>
/// Поле-идентификатор
/// </summary>
private ColumnInfo _primaryKey;
/// <summary>
/// Все поля таблицы
/// </summary>
private readonly Dictionary<string, ColumnInfo> _columns = new Dictionary<string, ColumnInfo>();
/// <summary>
/// Индексы
/// </summary>
private readonly List<IndexInfo> _indexes = new List<IndexInfo>();
#endregion
#region Properties
public ColumnInfo this[string columnName]
{
get
{
if (_columns.ContainsKey(columnName))
{
return _columns[columnName];
}
return null;
}
}
/// <summary>
/// Первичный ключ
/// </summary>
public ColumnInfo PrimaryKey
{
get { return _primaryKey; }
}
/// <summary>
/// Имя таблицы
/// </summary>
public string Name
{
get
{
return _name;
}
}
/// <summary>
/// Индексы
/// </summary>
public List<IndexInfo> Indexes
{
get
{
return _indexes;
}
}
/// <summary>
/// Поля таблицы
/// </summary>
public IEnumerable<ColumnInfo> Columns
{
get
{
return _columns.Values;
}
}
#endregion
#region Ctor
/// <summary>
/// Конструктор по-умолчанию
/// </summary>
/// <param name="name"></param>
public TableInfo(string name)
{
_name = name;
}
/// <summary>
/// Конструктор по-умолчанию
/// </summary>
/// <param name="name"></param>
public TableInfo(TableInfo other)
{
_name = other._name;
_columns = new Dictionary<string, ColumnInfo>(other._columns);
_indexes = new List<IndexInfo>(other._indexes);
_primaryKey = other._primaryKey;
}
#endregion
#region IEquatable
public override bool Equals(object obj)
{
return this.Equals(obj as TableInfo);
}
/// <summary>
/// Сравнение с другой таблицей
/// </summary>
public bool Equals(TableInfo other)
{
if (other == null || _name.Equals(other._name, StringComparison.OrdinalIgnoreCase) == false)
return false;
if (false == Columns.NoOrderingEquals(other.Columns))
{
return false;
}
return true;
}
#endregion
#region Abstract
protected abstract IEnumerable<IndexInfo> GetIndexes(IDbProvider db);
protected abstract IEnumerable<ColumnInfo> GetColumns(IDbProvider db);
#endregion
#region Fill table info
public void AppendNewColumn(ColumnInfo column)
{
_columns.Add(column.Name, column);
if (column.IsPrimaryKey)
_primaryKey = column;
}
/// <summary>
/// Заполнение данных о таблице
/// </summary>
/// <param name="db">Подключение к базе данных</param>
public void FillTableInfo(IDbProvider db)
{
foreach (var column in GetColumns(db))
{
_columns.Add(column.Name, column);
if (column.IsPrimaryKey)
{
_primaryKey = column;
}
}
foreach (var index in GetIndexes(db))
{
_indexes.Add(index);
}
}
#endregion
/// <summary>
/// Проверка наличия поля
/// </summary>
public bool ContainsColumns(ColumnInfo column)
{
return Columns.Any(r => r.Equals(column));
}
/// <summary>
/// Проверка наличия поля
/// </summary>
public bool ContainsColumns(string columnName)
{
return Columns.Any(r => r.Name.Equals(columnName, StringComparison.OrdinalIgnoreCase));
}
public override int GetHashCode()
{
return _name.GetHashCode();
}
}
}

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