public void Parse(Expression left, Expression right, Expression result)
{
step = 1;
Visit(left);
step = 2;
Visit(right);
Condition lastCondition = new SingleCondition()
{
Left = leftColumns.First(), Relation = " = ", Right = rightColumns.First()
};
for (int i = 1, len = leftColumns.Count; i < len; i++)
{
var groupCondition = new GroupCondition()
{
Left = lastCondition, Relation = " and "
};
var condition = new SingleCondition();
condition.Left = leftColumns[i];
condition.Relation = " = ";
condition.Right = rightColumns[i];
groupCondition.Right = condition;
lastCondition = groupCondition;
}
this.Condition = lastCondition;
step = 3;
Visit(result);
}
private Condition GetRelationCondition(string relation, BinaryExpression node)
{
var leftVisitor = new BinaryExpressionVisitor(this.Context);
leftVisitor.Visit(node.Left);
var rightVisitor = new BinaryExpressionVisitor(this.Context);
rightVisitor.Visit(node.Right);
if (leftVisitor.Column != null && rightVisitor.Column != null)
{
var condition = new SingleCondition();
condition.Left = leftVisitor.Column;
condition.Right = rightVisitor.Column;
condition.Relation = relation;
return(condition);
}
var group = new GroupCondition();
group.Left = leftVisitor.Condition ?? new SingleCondition()
{
Right = leftVisitor.Column
};
group.Right = rightVisitor.Condition ?? new SingleCondition()
{
Right = rightVisitor.Column
};
group.Relation = relation;
return(group);
}
private Condition GetRelationCondition(string relation, BinaryExpression node)
{
var condition = new GroupCondition();
condition.Relation = relation;
var leftVisitor = new WhereExpressionVisitor(this.Context);
leftVisitor.Visit(node.Left);
condition.Left = leftVisitor.Condition;
var rightVisitor = new WhereExpressionVisitor(this.Context);
rightVisitor.Visit(node.Right);
condition.Right = rightVisitor.Condition;
return(condition);
}
private Condition GetRelationCondition(string relation, BinaryExpression node)
{
var leftVisitor = new BinaryExpressionVisitor(this.Context);
leftVisitor.Visit(node.Left);
var rightVisitor = new BinaryExpressionVisitor(this.Context);
rightVisitor.Visit(node.Right);
if (leftVisitor.Column != null && rightVisitor.Column != null)
{
var condition = new SingleCondition();
condition.Left = leftVisitor.Column;
condition.Right = rightVisitor.Column;
condition.Relation = relation;
return condition;
}
var group = new GroupCondition();
group.Left = leftVisitor.Condition ?? new SingleCondition() { Right = leftVisitor.Column };
group.Right = rightVisitor.Condition ?? new SingleCondition() { Right = rightVisitor.Column };
group.Relation = relation;
return group;
}