public SelectExpressionVisitor(TranslateContext context) : base(context)
{
_memberExpressions = new Stack <Expression>();
_elementType = context.EntityType;
_Joins = context.Joins;
Columns = new List <Column>();
}
public JoinExpressionVisitor(TranslateContext context) : base(context)
{
Joins = context.Joins;
ExtraObject = new List <string>();
}
internal void Parse(Expression expression)
{
Distinct = false;
IsCallAny = false;
IsDelete = false;
IsUpdate = false;
UpdateResult = new Dictionary <string, object>();
_aggregationExpressions = new Dictionary <string, Expression>();
Conditions = new List <Token>();
_nolockExpressions = new List <Expression>();
NoLockTables = new List <string>();
AggregationColumns = new Dictionary <string, Column>();
_sortExpressions = new List <KeyValuePair <string, Expression> >();
SortColumns = new List <KeyValuePair <string, Column> >();
_context = new TranslateContext();
_take = -1;
_skip = -1;
_context.EntityType = ElementType;
Visit(expression);
if (AggregationColumns.Count > 1)
{
throw new Exception();
}
if ((_skip != -1) && (_take != -1) &&
!_sortExpressions.Any())
{
throw new Exception("分页必须进行排序");
}
foreach (MethodCallExpression expression2 in _joinExpressions)
{
VisitJoinExpression(expression2);
break;
}
if (_selectExpression != null)
{
var operand = (_selectExpression as UnaryExpression).Operand as LambdaExpression;
VisitSelectExpression(operand.Body);
}
else
{
VisitSelectExpression(null);
}
using (var enumerator = _whereExpressions.GetEnumerator())
{
while (enumerator.MoveNext())
{
var body =
((((MethodCallExpression)enumerator.Current).Arguments[1] as UnaryExpression).Operand as
LambdaExpression).Body;
if (body is ConstantExpression)
{
if (!(bool)(body as ConstantExpression).Value)
{
Conditions.Add(Token.Create(false));
}
}
else
{
VisitWhereExpression(body);
}
}
}
foreach (var expression5 in _nolockExpressions)
{
VisitNoLockExpression(expression5);
}
foreach (var pair in _aggregationExpressions)
{
VisitAggreationExpression(pair);
}
foreach (var pair2 in _sortExpressions)
{
VisitSortExpression(pair2);
}
VisitUpdateExpression(_updateExpression);
}
public BinaryExpressionVisitor(TranslateContext context) : base(context)
{
_joins = context.Joins;
}
public PropertyFieldExpressionVisitor(TranslateContext context) : base(context)
{
_memberInfos = new Stack <Expression>();
_joins = context.Joins;
_columns = context.Columns;
}
public ExpressionVisitorBase(TranslateContext context)
{
Context = context;
}
public MemberExpressionVisitor(TranslateContext context) : base(context)
{
_memberInfoStack = new Stack <MemberInfo>();
_Joins = context.Joins;
SelectedColumn = new Column();
}
public NoLockExpressionVisitor(TranslateContext context) : base(context)
{
}
public MethodCallExpressionVisitor(TranslateContext context) : base(context)
{
_joins = context.Joins;
}