private void AddJoin(Expression expression, SGBD.Sgbd.Join join)
{
try
{
if (expression is MemberExpression)
{
MemberExpression operand = expression as MemberExpression;
string propertyName = operand.Member.Name;
System.Type[] arguments = this.GetType().GetGenericArguments();
if (arguments.Length > 0)
{
System.Type table = arguments[0];
PropertyInfo colonne = table.GetProperty(propertyName);
if (colonne.GetCustomAttribute(typeof(JoinColumn)) != null)
{
string tableName = DataBase.SGBD.TableName(table);
string colonneName = tableName + "." + DataBase.SGBD.ColonnName(colonne);
string liaison = " inner join ";
switch (join)
{
case SGBD.Sgbd.Join.LEFT:
liaison = " left join ";
break;
case SGBD.Sgbd.Join.RIGHT:
liaison = " right join ";
break;
}
string referenceTable = DataBase.SGBD.TableName(colonne.PropertyType);
string referenceName = referenceTable + "." + DataBase.SGBD.ReferenceName(colonne);
liaison += referenceTable + " " + referenceTable + " on " + colonneName + " = " + referenceName;
this.join += liaison;
}
}
}
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
}
public DbSet <T> Join(Expression <Func <T, Object> > expression, SGBD.Sgbd.Join join)
{
try
{
if (expression.Body is MemberExpression)
{
MemberExpression operand = expression.Body as MemberExpression;
AddJoin(operand, join);
}
else if (expression.Body is NewExpression)
{
NewExpression lbex = expression.Body as NewExpression;
foreach (Expression argument in lbex.Arguments)
{
AddJoin(argument, join);
}
}
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
return(this);
}
