protected override Expression VisitMethodCall(MethodCallExpression node)
{
if (node.Method.DeclaringType == typeof(InfluxFunctions))
{
if (node.Method.Name == "Count")
{
Clause.Append("COUNT(");
Visit(node.Arguments[0]);
Clause.Append(")");
}
else if (node.Method.Name == "Sum")
{
Clause.Append("SUM(");
Visit(node.Arguments[0]);
Clause.Append(")");
}
_requiresExplicitName = true;
return(node);
}
else
{
throw new NotSupportedException($"The method '{node.Method.Name}' on '{node.Method.DeclaringType.FullName}' is not supported in a select clause.");
}
}
protected override void OnMemberFound(MemberInfo member)
{
var property = Metadata.PropertiesByClrName[member.Name];
Clause.Append(property.QueryProtocolEscapedKey)
.Append(", ");
}
protected override void OnMemberFound(MemberInfo member)
{
var property = Metadata.PropertiesByClrName[member.Name];
if (property.Key != InfluxConstants.TimeColumn)
{
Clause.Append(property.QueryProtocolEscapedKey);
_lastColumnName = property.QueryProtocolEscapedKey;
_foundMember = true;
}
}
protected override Expression VisitConstant(ConstantExpression node)
{
if (node.Value == null)
{
Clause.Append("NULL");
}
else
{
var value = QueryEscape.EscapeFieldOrTag(node.Value);
Clause.Append(value);
}
return(node);
}
internal string GetOrderByClause(OrderByClause orderBy)
{
Projection = orderBy.Projection;
_orderBy = orderBy;
Visit(_orderBy.Expression);
Clause.Remove(Clause.Length - 2, 2);
if (orderBy.IsAscending)
{
Clause.Append(" ASC");
}
else
{
Clause.Append(" DESC");
}
return(Clause.ToString());
}
protected override Expression VisitMethodCall(MethodCallExpression node)
{
if (node.Method.DeclaringType == typeof(InfluxFunctions))
{
if (node.Method.Name == "Now")
{
Clause.Append("now()");
}
else if (node.Method.Name == "Count")
{
Clause.Append("COUNT(");
Visit(node.Arguments[0]);
Clause.Append(")");
}
return(node);
}
else
{
throw new NotSupportedException($"The method '{node.Method.Name}' on '{node.Method.DeclaringType.FullName}' is not supported.");
}
}
private void AddPostColumnString()
{
if (_foundMember)
{
if (_requiresExplicitName)
{
Clause.Append(" AS ")
.Append(_lastColumnName);
}
}
_requiresExplicitName = false;
_foundMember = false;
if (Clause[Clause.Length - 1] == ' ')
{
Clause.Remove(Clause.Length - 2, 2);
}
if (_foundMember)
{
Clause.Append(", ");
}
}
protected override Expression VisitBinary(BinaryExpression b)
{
Clause.Append("(");
// TODO: Support ~=, !~
Visit(b.Left);
switch (b.NodeType)
{
case ExpressionType.Add:
Clause.Append(" + ");
break;
case ExpressionType.Subtract:
Clause.Append(" - ");
break;
case ExpressionType.Multiply:
Clause.Append(" * ");
break;
case ExpressionType.Divide:
Clause.Append(" / ");
break;
default:
throw new NotSupportedException($"The binary operator '{b.NodeType}' is not supported in a select clause.");
}
Visit(b.Right);
Clause.Append(")");
return(b);
}
protected override Expression VisitBinary(BinaryExpression b)
{
Clause.Append("(");
// TODO: Support ~=, !~
Visit(b.Left);
switch (b.NodeType)
{
case ExpressionType.Add:
Clause.Append(" + ");
break;
case ExpressionType.Subtract:
Clause.Append(" - ");
break;
case ExpressionType.Multiply:
Clause.Append(" * ");
break;
case ExpressionType.Divide:
Clause.Append(" / ");
break;
case ExpressionType.AndAlso:
Clause.Append(" AND ");
break;
case ExpressionType.OrElse:
Clause.Append(" OR ");
break;
case ExpressionType.Equal:
Clause.Append(" = ");
break;
case ExpressionType.NotEqual:
Clause.Append(" <> ");
break;
case ExpressionType.LessThan:
Clause.Append(" < ");
break;
case ExpressionType.LessThanOrEqual:
Clause.Append(" <= ");
break;
case ExpressionType.GreaterThan:
Clause.Append(" > ");
break;
case ExpressionType.GreaterThanOrEqual:
Clause.Append(" >= ");
break;
default:
throw new NotSupportedException($"The binary operator '{b.NodeType}' is not supported");
}
Visit(b.Right);
Clause.Append(")");
return(b);
}
