/// <summary>
/// Create new instance of <see cref="DataTableHandler"/>
/// </summary>
/// <param name="ObjectType">DataObject Type</param>
public DataTableHandler(Type ObjectType)
{
if (!typeof(DataObject).IsAssignableFrom(ObjectType))
{
throw new ArgumentException("DataTableHandler can only register DataObject Types", "ObjectType");
}
this.ObjectType = ObjectType;
// Init Cache and Table Params
TableName = AttributesUtils.GetTableOrViewName(ObjectType);
var isView = AttributesUtils.GetViewName(ObjectType) != null;
HasRelations = false;
UsesPreCaching = AttributesUtils.GetPreCachedFlag(ObjectType);
if (UsesPreCaching)
{
_precache = new ConcurrentDictionary <object, DataObject>();
}
// Parse Table Type
ElementBindings = ObjectType.GetMembers().Select(member => new ElementBinding(member)).Where(bind => bind.IsDataElementBinding).ToArray();
// Views Can't Handle Auto GUID Key
if (!isView)
{
// If no Primary Key AutoIncrement add GUID
if (FieldElementBindings.Any(bind => bind.PrimaryKey != null && !bind.PrimaryKey.AutoIncrement))
{
ElementBindings = ElementBindings.Concat(new [] {
new ElementBinding(ObjectType.GetProperty("ObjectId"),
new DataElement()
{
Unique = true
},
string.Format("{0}_ID", TableName))
}).ToArray();
}
else if (FieldElementBindings.All(bind => bind.PrimaryKey == null))
{
ElementBindings = ElementBindings.Concat(new [] {
new ElementBinding(ObjectType.GetProperty("ObjectId"),
new PrimaryKey(),
string.Format("{0}_ID", TableName))
}).ToArray();
}
}
// Prepare Table
Table = new DataTable(TableName);
var multipleUnique = new List <ElementBinding>();
var indexes = new Dictionary <string, ElementBinding[]>();
//Build Table for DataSet
foreach (var bind in ElementBindings)
{
if (bind.Relation != null)
{
HasRelations = true;
continue;
}
var column = Table.Columns.Add(bind.ColumnName, bind.ValueType);
if (bind.PrimaryKey != null)
{
column.AutoIncrement = bind.PrimaryKey.AutoIncrement;
Table.PrimaryKey = new [] { column };
}
if (bind.DataElement != null)
{
column.AllowDBNull = bind.DataElement.AllowDbNull;
// Store Multi Unique for definition after table
// Single Unique can be defined directly.
if (!string.IsNullOrEmpty(bind.DataElement.UniqueColumns))
{
multipleUnique.Add(bind);
}
else if (bind.DataElement.Unique)
{
Table.Constraints.Add(new UniqueConstraint(string.Format("U_{0}_{1}", TableName, bind.ColumnName), column));
}
// Store Indexes for definition after table
if (!string.IsNullOrEmpty(bind.DataElement.IndexColumns))
{
indexes.Add(string.Format("I_{0}_{1}", TableName, bind.ColumnName), bind.DataElement.IndexColumns.Split(',')
.Select(col => FieldElementBindings.FirstOrDefault(ind => ind.ColumnName.Equals(col.Trim(), StringComparison.OrdinalIgnoreCase)))
.Concat(new [] { bind }).ToArray());
}
else if (bind.DataElement.Index)
{
indexes.Add(string.Format("I_{0}_{1}", TableName, bind.ColumnName), new [] { bind });
}
if (bind.DataElement.Varchar > 0)
{
column.ExtendedProperties.Add("VARCHAR", bind.DataElement.Varchar);
}
}
}
// Set Indexes when all columns are set
Table.ExtendedProperties.Add("INDEXES", indexes.Select(kv => new KeyValuePair <string, DataColumn[]>(
kv.Key,
kv.Value.Select(bind => Table.Columns[bind.ColumnName]).ToArray()))
.ToDictionary(kv => kv.Key, kv => kv.Value));
// Set Unique Constraints when all columns are set.
foreach (var bind in multipleUnique)
{
var columns = bind.DataElement.UniqueColumns.Split(',').Select(column => column.Trim()).Concat(new [] { bind.ColumnName });
Table.Constraints.Add(new UniqueConstraint(string.Format("U_{0}_{1}", TableName, bind.ColumnName),
columns.Select(column => Table.Columns[column]).ToArray()));
}
}
public MainWindow()
{
InitializeComponent();
InitializeObjects();
ElementBindings.Binding(dataGridQuestion, comboBoxTemplates, comboBoxResult);
}
