protected override Expression VisitMember(MemberExpression node)
{
var visitor = new MemberExpressionVisitor(this.Context);
visitor.Visit(node);
Column = visitor.Column;
return node;
}
protected override Expression VisitMember(MemberExpression node)
{
var visitor = new MemberExpressionVisitor(this.Context);
visitor.Visit(node);
if (visitor.Column.Type == typeof(bool))
{
var column = new ParameterColumn(this.Context.AddParameter(true))
{
Type = typeof(bool)
};
this.Condition = new SingleCondition {
Left = visitor.Column, Relation = "=", Right = column
};
}
else
{
this.Condition = new SingleCondition {
Right = visitor.Column
};
}
return(node);
}
protected override Expression VisitMethodCall(MethodCallExpression node)
{
switch (node.Method.Name)
{
case "First":
case "FirstOrDefault":
this.Visit(node.Arguments[0]);
if (this.context.IsQueryResultChanged)
{
var oldContext = this.context;
this.context = oldContext.CopyTo();
this.context.Fragment.FromPart.Add(new QueryTable(oldContext.WrapToFragment(), this.context.GetTableAlias(oldContext.ExportType)));
}
if (node.Arguments.Count == 2)
{
ParseWhereExpresson(node.Arguments[1]);
}
this.context.Fragment.Take = 1;
break;
case "Last":
case "LastOrDefault":
this.Visit(node.Arguments[0]);
if (this.context.IsQueryResultChanged)
{
var oldContext = this.context;
this.context = oldContext.CopyTo();
this.context.Fragment.FromPart.Add(new QueryTable(oldContext.WrapToFragment(), this.context.GetTableAlias(oldContext.ExportType)));
}
if (node.Arguments.Count == 2)
{
ParseWhereExpresson(node.Arguments[1]);
}
break;
case "Where":
this.Visit(node.Arguments[0]);
if (this.context.IsQueryResultChanged)
{
var oldContext = this.context;
this.context = oldContext.CopyTo();
this.context.Fragment.FromPart.Add(new QueryTable(oldContext.WrapToFragment(), this.context.GetTableAlias(oldContext.ExportType)));
}
ParseWhereExpresson(node.Arguments[1]);
break;
case "Select":
this.Visit(node.Arguments[0]);
var selectVisitor = new SelectExpressionVisitor(context);
selectVisitor.Visit(node.Arguments[1]);
this.context.Fragment.SelectPart = selectVisitor.Columns;
break;
case "Skip":
this.Visit(node.Arguments[0]);
this.context.Fragment.Skip = (int)(node.Arguments[1] as ConstantExpression).Value;
break;
case "Take":
this.Visit(node.Arguments[0]);
this.context.Fragment.Take = (int)(node.Arguments[1] as ConstantExpression).Value;
break;
case "OrderBy":
case "OrderByDescending":
case "ThenBy":
case "ThenByDescending":
this.Visit(node.Arguments[0]);
var orderVisitor = new MemberExpressionVisitor(context);
orderVisitor.Visit(node.Arguments[1]);
this.context.Fragment.OrderPart.Add(new OrderCondition(orderVisitor.Column,
node.Method.Name == "OrderBy" || node.Method.Name == "ThenBy" ? "asc" : "desc"));
break;
case "Any":
case "Count":
var parser = new QueryExpressionParser(this.connection, this.context.CopyTo());
parser.Visit(node.Arguments[0]);
this.context.Fragment.FromPart.Add(new QueryTable(parser.context.WrapToFragment(), this.context.GetTableAlias(parser.ExportType)));
if (node.Arguments.Count > 1)
{
ParseWhereExpresson(node.Arguments[1]);
}
this.context.Fragment.SelectPart.Add(new FunctionColumn()
{
Formatter = "Count(*)"
});
break;
case "GroupJoin":
ParseJoinExpression(node, JoinMode.LeftJoin);
break;
case "Join":
ParseJoinExpression(node, JoinMode.InnerJoin);
break;
case "SelectMany":
ParseSelectManyExpression(node);
break;
case "GroupBy":
ParseGroupByExpression(node);
break;
case "Predicate":
if (node.Arguments[0].Type == typeof(IDbConnection))
{
var elementType = node.Type.GetGenericArguments()[0];
this.context.ExportType = this.context.ImportType = elementType;
var typeMapper = TypeMapperCache.GetTypeMapper(elementType);
this.context.Fragment.FromPart.Add(new SingleTable(typeMapper.TableName, this.context.GetTableAlias(elementType)));
}
break;
case "DefaultIfEmpty":
break;
default:
break;
}
return(node);
}
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 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;
}
