Added HAVING clause
This commit is contained in:
grzegorz.russek
496
DynamORM/DynamicCachedReader.cs
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496
DynamORM/DynamicCachedReader.cs
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@@ -0,0 +1,496 @@
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using System;
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using System.Collections.Generic;
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using System.Data;
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using System.Dynamic;
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using System.IO;
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using DynamORM.Helpers;
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using DynamORM.Mapper;
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namespace DynamORM
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{
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/// <summary>Cache data reader in memory.</summary>
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internal class DynamicCachedReader : DynamicObject, IDataReader
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{
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#region Constructor and Data
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private DataTable _schema;
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private int _fields;
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private int _rows;
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private int _position;
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private int _cachePos;
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private IList<string> _names;
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private IDictionary<string, int> _ordinals;
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private IList<Type> _types;
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private IList<object> _cache;
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private DynamicCachedReader()
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{
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}
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/// <summary>Initializes a new instance of the <see cref="DynamicCachedReader"/> class.</summary>
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/// <param name="reader">Reader to cache.</param>
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public DynamicCachedReader(IDataReader reader)
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{
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InitDataReader(reader);
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}
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#endregion Constructor and Data
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#region Helpers
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/// <summary>Create data reader from enumerable.</summary>
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/// <typeparam name="T">Type of enumerated objects.</typeparam>
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/// <param name="objects">List of objects.</param>
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/// <returns>Instance of <see cref="DynamicCachedReader"/> containing objects data.</returns>
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public static DynamicCachedReader FromEnumerable<T>(IEnumerable<T> objects)
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{
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var mapper = DynamicMapperCache.GetMapper<T>();
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if (mapper == null)
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throw new InvalidCastException(string.Format("Object type '{0}' can't be mapped.", typeof(T).FullName));
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var r = new DynamicCachedReader();
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r.Init(mapper.ColumnsMap.Count + 1);
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r.CreateSchemaTable(mapper);
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r.FillFromEnumerable(objects, mapper);
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return r;
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}
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private void InitDataReader(IDataReader reader)
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{
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_schema = reader.GetSchemaTable();
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Init(reader.FieldCount);
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int i = 0;
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for (i = 0; i < _fields; i++)
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{
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_names.Add(reader.GetName(i));
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_types.Add(reader.GetFieldType(i));
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if (!_ordinals.ContainsKey(reader.GetName(i).ToUpper()))
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_ordinals.Add(reader.GetName(i).ToUpper(), i);
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}
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while (reader.Read())
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{
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for (i = 0; i < _fields; i++)
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_cache.Add(reader[i]);
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_rows++;
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}
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IsClosed = false;
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_position = -1;
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_cachePos = -1;
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reader.Close();
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}
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private void FillFromEnumerable<T>(IEnumerable<T> objects, DynamicTypeMap mapper)
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{
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foreach (var elem in objects)
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{
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foreach (var col in mapper.ColumnsMap)
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{
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object val = null;
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if (col.Value.Get != null)
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val = col.Value.Get(elem);
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_cache.Add(val);
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}
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_cache.Add(elem);
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_rows++;
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}
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}
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private void CreateSchemaTable(DynamicTypeMap mapper)
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{
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_schema = new DataTable("DYNAMIC");
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_schema.Columns.Add(new DataColumn("ColumnName", typeof(string)));
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_schema.Columns.Add(new DataColumn("ColumnOrdinal", typeof(int)));
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_schema.Columns.Add(new DataColumn("ColumnSize", typeof(int)));
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_schema.Columns.Add(new DataColumn("NumericPrecision", typeof(short)));
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_schema.Columns.Add(new DataColumn("NumericScale", typeof(short)));
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_schema.Columns.Add(new DataColumn("DataType", typeof(Type)));
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_schema.Columns.Add(new DataColumn("ProviderType", typeof(int)));
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_schema.Columns.Add(new DataColumn("NativeType", typeof(int)));
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_schema.Columns.Add(new DataColumn("AllowDBNull", typeof(bool)));
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_schema.Columns.Add(new DataColumn("IsUnique", typeof(bool)));
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_schema.Columns.Add(new DataColumn("IsKey", typeof(bool)));
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_schema.Columns.Add(new DataColumn("IsAutoIncrement", typeof(bool)));
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int ordinal = 0;
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DataRow dr = null;
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foreach (var column in mapper.ColumnsMap)
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{
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dr = _schema.NewRow();
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dr[0] = column.Value.Column.NullOr(x => x.Name ?? column.Value.Name, column.Value.Name);
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dr[1] = ordinal;
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dr[2] = column.Value.Column.NullOr(x => x.Size ?? int.MaxValue, int.MaxValue);
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dr[3] = column.Value.Column.NullOr(x => x.Precision ?? 0, 0);
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dr[4] = column.Value.Column.NullOr(x => x.Scale ?? 0, 0);
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dr[5] = column.Value.Column.NullOr(x => x.Type.HasValue ? x.Type.Value.ToType() : column.Value.Type, column.Value.Type);
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dr[6] = column.Value.Column.NullOr(x => x.Type ?? column.Value.Type.ToDbType(), column.Value.Type.ToDbType());
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dr[7] = column.Value.Column.NullOr(x => x.Type ?? column.Value.Type.ToDbType(), column.Value.Type.ToDbType());
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dr[8] = !column.Value.Column.NullOr(x => x.IsKey, false);
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dr[9] = false;
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dr[10] = column.Value.Column.NullOr(x => x.IsKey, false);
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dr[11] = false;
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_schema.Rows.Add(dr);
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_names.Add(dr[0].ToString());
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_ordinals.Add(dr[0].ToString().ToUpper(), ordinal++);
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_types.Add((Type)dr[5]);
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dr.AcceptChanges();
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}
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dr = _schema.NewRow();
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dr[0] = "#O";
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dr[1] = ordinal;
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dr[2] = int.MaxValue;
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dr[3] = 0;
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dr[4] = 0;
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dr[5] = mapper.Type;
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dr[6] = DbType.Object;
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dr[7] = DbType.Object;
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dr[8] = true;
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dr[9] = false;
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dr[10] = false;
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dr[11] = false;
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_schema.Rows.Add(dr);
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_names.Add("#O");
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_ordinals.Add("#O".ToUpper(), ordinal++);
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_types.Add(mapper.Type);
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dr.AcceptChanges();
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}
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private void Init(int fieldCount)
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{
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_rows = 0;
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_fields = fieldCount;
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_names = new List<string>(_fields);
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_ordinals = new Dictionary<string, int>(_fields);
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_types = new List<Type>(_fields);
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_cache = new List<object>(_fields * 100);
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}
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#endregion Helpers
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#region IDataReader Members
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/// <summary>Closes the System.Data.IDataReader Object.</summary>
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public void Close()
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{
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IsClosed = true;
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_position = _rows;
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_cachePos = -1;
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}
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/// <summary>Gets a value indicating the depth of nesting for the current row.</summary>
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/// <remarks>This implementation use this field to indicate row count.</remarks>
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public int Depth
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{
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get { return _rows; }
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}
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/// <summary>Returns a System.Data.DataTable that describes the column metadata of the
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/// System.Data.IDataReader.</summary><returns>A System.Data.DataTable that describes
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/// the column metadata.</returns><exception cref="System.InvalidOperationException">
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/// The System.Data.IDataReader is closed.</exception>
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public DataTable GetSchemaTable()
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{
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return _schema;
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}
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/// <summary>Gets a value indicating whether the data reader is closed.</summary>
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public bool IsClosed { get; private set; }
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/// <summary>Advances the data reader to the next result, when reading the results of batch SQL statements.</summary>
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/// <returns>Returns true if there are more rows; otherwise, false.</returns>
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public bool NextResult()
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{
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_cachePos = (++_position) * _fields;
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return _position < _rows;
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}
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/// <summary>Advances the System.Data.IDataReader to the next record.</summary>
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/// <returns>Returns true if there are more rows; otherwise, false.</returns>
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public bool Read()
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{
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_cachePos = (++_position) * _fields;
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return _position < _rows;
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}
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/// <summary>Gets the number of rows changed, inserted, or deleted by execution of the SQL statement.</summary>
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/// <returns>The number of rows changed, inserted, or deleted; 0 if no rows were affected or the statement
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/// failed; and -1 for SELECT statements.</returns>
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public int RecordsAffected { get { return 0; } }
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#endregion IDataReader Members
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#region IDisposable Members
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/// <summary>Performs application-defined tasks associated with
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/// freeing, releasing, or resetting unmanaged resources.</summary>
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public void Dispose()
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{
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_names.Clear();
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_types.Clear();
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_cache.Clear();
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_schema.Dispose();
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}
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#endregion IDisposable Members
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#region IDataRecord Members
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/// <summary>Gets the number of columns in the current row.</summary>
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/// <remarks>When not positioned in a valid record set, 0; otherwise, the number of columns in the current record. The default is -1.</remarks>
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public int FieldCount { get { return _fields; } }
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/// <summary>Return the value of the specified field.</summary>
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/// <param name="i">The index of the field to find.</param>
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/// <returns>Field value upon return.</returns>
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public bool GetBoolean(int i)
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{
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return (bool)_cache[_cachePos + i];
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}
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/// <summary>Return the value of the specified field.</summary>
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/// <param name="i">The index of the field to find.</param>
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/// <returns>Field value upon return.</returns>
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public byte GetByte(int i)
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{
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return (byte)_cache[_cachePos + i];
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}
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/// <summary>Reads a stream of bytes from the specified column offset into the buffer
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/// as an array, starting at the given buffer offset.</summary>
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/// <param name="i">The index of the field to find.</param>
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/// <param name="fieldOffset">The index within the field from which to start the read operation.</param>
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/// <param name="buffer">The buffer into which to read the stream of bytes.</param>
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/// <param name="bufferoffset">The index for buffer to start the read operation.</param>
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/// <param name="length">The number of bytes to read.</param>
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/// <returns>The actual number of bytes read.</returns>
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public long GetBytes(int i, long fieldOffset, byte[] buffer, int bufferoffset, int length)
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{
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using (MemoryStream ms = new MemoryStream((byte[])_cache[_cachePos + i]))
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return ms.Read(buffer, bufferoffset, length);
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}
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/// <summary>Return the value of the specified field.</summary>
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/// <param name="i">The index of the field to find.</param>
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/// <returns>Field value upon return.</returns>
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public char GetChar(int i)
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{
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return (char)_cache[_cachePos + i];
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}
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/// <summary>Reads a stream of characters from the specified column offset into the buffer
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/// as an array, starting at the given buffer offset.</summary>
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/// <param name="i">The zero-based column ordinal.</param>
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/// <param name="fieldoffset">The index within the row from which to start the read operation.</param>
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/// <param name="buffer">The buffer into which to read the stream of bytes.</param>
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/// <param name="bufferoffset">The index for buffer to start the read operation.</param>
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/// <param name="length">The number of bytes to read.</param>
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/// <returns>The actual number of characters read.</returns>
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public long GetChars(int i, long fieldoffset, char[] buffer, int bufferoffset, int length)
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{
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using (MemoryStream ms = new MemoryStream((byte[])_cache[_cachePos + i]))
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{
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byte[] buff = new byte[buffer.Length];
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long ret = ms.Read(buff, bufferoffset, length);
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for (int n = bufferoffset; n < ret; n++)
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buffer[n] = (char)buff[n];
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return ret;
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}
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}
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/// <summary>Returns an System.Data.IDataReader for the specified column ordinal.</summary>
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/// <param name="i">The index of the field to find.</param>
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/// <returns>An System.Data.IDataReader.</returns>
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public IDataReader GetData(int i)
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{
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return null;
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}
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/// <summary>Gets the data type information for the specified field.</summary>
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/// <param name="i">The index of the field to find.</param>
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/// <returns>The data type information for the specified field.</returns>
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public string GetDataTypeName(int i)
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{
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return _types[i].Name;
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}
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/// <summary>Return the value of the specified field.</summary>
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/// <param name="i">The index of the field to find.</param>
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/// <returns>Field value upon return.</returns>
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public DateTime GetDateTime(int i)
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{
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return (DateTime)_cache[_cachePos + i];
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}
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/// <summary>Return the value of the specified field.</summary>
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/// <param name="i">The index of the field to find.</param>
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/// <returns>Field value upon return.</returns>
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public decimal GetDecimal(int i)
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{
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return (decimal)_cache[_cachePos + i];
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}
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/// <summary>Return the value of the specified field.</summary>
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/// <param name="i">The index of the field to find.</param>
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/// <returns>Field value upon return.</returns>
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public double GetDouble(int i)
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{
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return (double)_cache[_cachePos + i];
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}
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/// <summary>Gets the System.Type information corresponding to the type of System.Object
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/// that would be returned from System.Data.IDataRecord.GetValue(System.Int32).</summary>
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/// <param name="i">The index of the field to find.</param>
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/// <returns>The System.Type information corresponding to the type of System.Object that
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/// would be returned from System.Data.IDataRecord.GetValue(System.Int32).</returns>
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public Type GetFieldType(int i)
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{
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return _types[i];
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}
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/// <summary>Return the value of the specified field.</summary>
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/// <param name="i">The index of the field to find.</param>
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/// <returns>Field value upon return.</returns>
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public float GetFloat(int i)
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{
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return (float)_cache[_cachePos + i];
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}
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/// <summary>Return the value of the specified field.</summary>
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/// <param name="i">The index of the field to find.</param>
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/// <returns>Field value upon return.</returns>
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public Guid GetGuid(int i)
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{
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return (Guid)_cache[_cachePos + i];
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}
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/// <summary>Return the value of the specified field.</summary>
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/// <param name="i">The index of the field to find.</param>
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/// <returns>Field value upon return.</returns>
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public short GetInt16(int i)
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{
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return (short)_cache[_cachePos + i];
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}
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/// <summary>Return the value of the specified field.</summary>
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/// <param name="i">The index of the field to find.</param>
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/// <returns>Field value upon return.</returns>
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public int GetInt32(int i)
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{
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return (int)_cache[_cachePos + i];
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}
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/// <summary>Return the value of the specified field.</summary>
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/// <param name="i">The index of the field to find.</param>
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/// <returns>Field value upon return.</returns>
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public long GetInt64(int i)
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{
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return (long)_cache[_cachePos + i];
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}
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/// <summary>Gets the name for the field to find.</summary>
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/// <param name="i">The index of the field to find.</param>
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/// <returns>The name of the field or the empty string (""), if there is no value to return.</returns>
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public string GetName(int i)
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{
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return _names[i];
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}
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/// <summary>Return the index of the named field.</summary>
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/// <param name="name">The name of the field to find.</param>
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/// <returns>The index of the named field.</returns>
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public int GetOrdinal(string name)
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{
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if (_ordinals.ContainsKey(name.ToUpper()))
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return _ordinals[name.ToUpper()];
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return -1;
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}
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/// <summary>Return the value of the specified field.</summary>
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/// <param name="i">The index of the field to find.</param>
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/// <returns>Field value upon return.</returns>
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public string GetString(int i)
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{
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return (string)_cache[_cachePos + i];
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}
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/// <summary>Return the value of the specified field.</summary>
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/// <param name="i">The index of the field to find.</param>
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/// <returns>Field value upon return.</returns>
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public object GetValue(int i)
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{
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return _cache[_cachePos + i];
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}
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/// <summary>Gets all the attribute fields in the collection for the current record.</summary>
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/// <param name="values">An array of System.Object to copy the attribute fields into.</param>
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/// <returns>The number of instances of System.Object in the array.</returns>
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public int GetValues(object[] values)
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{
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for (int i = 0; i < _fields; i++)
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values[i] = _cache[_cachePos + i];
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return _fields;
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}
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/// <summary>Return whether the specified field is set to null.</summary>
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/// <param name="i">The index of the field to find.</param>
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/// <returns>Returns true if the specified field is set to null; otherwise, false.</returns>
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public bool IsDBNull(int i)
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{
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return _cache[_cachePos + i] == null || _cache[_cachePos + i] == DBNull.Value;
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}
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/// <summary>Gets or sets specified value in current record.</summary>
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/// <param name="name">Name of column.</param>
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/// <returns>Value of specified column.</returns>
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public object this[string name]
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{
|
||||
get
|
||||
{
|
||||
if (_ordinals.ContainsKey(name.ToUpper()))
|
||||
return _cache[_cachePos + _ordinals[name.ToUpper()]];
|
||||
|
||||
throw new IndexOutOfRangeException(String.Format("Field '{0}' not found.", name));
|
||||
}
|
||||
}
|
||||
|
||||
/// <summary>Gets or sets specified value in current record.</summary>
|
||||
/// <param name="i">The index of the field to find.</param>
|
||||
/// <returns>Value of specified column.</returns>
|
||||
public object this[int i]
|
||||
{
|
||||
get { return _cache[_cachePos + i]; }
|
||||
}
|
||||
|
||||
#endregion IDataRecord Members
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user