public void Add(Column column)
{
this.Parameters.Add(column);
}
public OrderCondition(Column column, string order)
{
this.Column = column;
this.Order = order;
}
public OrderCondition(Column column, string order)
{
this.Column = column;
this.Order = order;
}
public string ToSql(SqlGenerator generator)
{
return(string.Format("{0} {1}", Column.ToSql(generator), Order));
}
public void Add(Column column)
{
this.Parameters.Add(column);
}
private void ParseMethodMax(MethodCallExpression node)
{
var column = new FunctionColumn();
column.Formatter = "Max({0})";
var paramVisitor = new MemberExpressionVisitor(Context);
paramVisitor.Visit(node.Arguments[1]);
column.Add(paramVisitor.Column);
this.Column = column;
}
private void ParseMethodCount(MethodCallExpression node)
{
var column = new FunctionColumn();
column.Formatter = "Count(*)";
//var paramVisitor = new MemberExpressionVisitor(Context);
//paramVisitor.Visit(node.Arguments[0]);
//column.Add(paramVisitor.Column);
this.Column = column;
this.Column.Alias = (node.Arguments[0] as ParameterExpression).Name;
}
private void ParseMethodContains(MethodCallExpression node)
{
var column = new FunctionColumn();
var objectVisitor = new MemberExpressionVisitor(Context);
var paramVisitor = new MemberExpressionVisitor(Context);
if (node.Object != null && (node.Object.NodeType == ExpressionType.MemberAccess || node.Object.NodeType == ExpressionType.Constant))
{
objectVisitor.Visit(node.Object);
paramVisitor.Visit(node.Arguments[0]);
}
else
{
objectVisitor.Visit(node.Arguments[1]);
paramVisitor.Visit(node.Arguments[0]);
}
if (objectVisitor.Column.Type == typeof(string))
{
column.Formatter = "LOCATE({1}, {0}) > 0";
}
else
{
column.Formatter = "{0} in {1}";
}
column.Add(objectVisitor.Column);
column.Add(paramVisitor.Column);
this.Column = column;
}
protected override Expression VisitMethodCall(MethodCallExpression node)
{
if (!node.IsConstant())
{
switch (node.Method.Name)
{
case "Contains":
ParseMethodContains(node);
break;
case "Count":
ParseMethodCount(node);
break;
case "Max":
ParseMethodMax(node);
break;
}
}
else
{
var objectMember = Expression.Convert(node, typeof(object));
var getterLambda = Expression.Lambda<Func<object>>(objectMember);
var getter = getterLambda.Compile()();
this.Column = new ParameterColumn(this.Context.AddParameter(getter)) { Type = node.Type };
}
return node;
}
