protected virtual StatementPart VisitColumnMemberAccess(MemberExpression memberExpression)
{
if (memberExpression.Member.DeclaringType == typeof(string) &&
memberExpression.Member.Name == "Length")
{
return(new StatementPart(
DialectProvider.GetStringFunction("length",
_statement,
null,
null)));
}
if (memberExpression.Member.DeclaringType == typeof(DateTime))
{
switch (memberExpression.Member.Name)
{
case "Year":
case "Month":
case "Day":
case "Hour":
case "Minute":
case "Second":
return(new StatementPart(
DialectProvider.GetDatePartFunction(memberExpression.Member.Name, _statement)));
default:
throw new NotSupportedException();
}
}
return(null);
}
protected virtual StatementPart VisitColumnMethodCall(MethodCallExpression methodCallExpression)
{
var args = new List <StatementPart>();
if (methodCallExpression.Arguments.Count == 1 &&
methodCallExpression.Arguments[0].NodeType == ExpressionType.Constant)
{
args.Add(VisitConstant((ConstantExpression)methodCallExpression.Arguments[0]));
}
else
{
args.AddRange(VisitExpressionList(methodCallExpression.Arguments));
}
var quotedColName = Visit(methodCallExpression.Object).ToString();
var statement = DialectProvider.GetStringFunction(
methodCallExpression.Method.Name,
quotedColName,
Parameters,
args.Select(x => x.Text).ToArray());
return(new StatementPart(statement));
}
protected override StatementPart VisitMemberAccess(MemberExpression m)
{
//Nullable support HasValue
if (m.Member.DeclaringType != null &&
Nullable.GetUnderlyingType(m.Member.DeclaringType) != null &&
m.Member.Name == "HasValue")
{
return(new StatementPart(Visit(m.Expression) + " IS NOT NULL"));
}
if (m.Member.DeclaringType == typeof(string) &&
m.Member.Name == "Length")
{
return(new StatementPart(
DialectProvider.GetStringFunction("length",
Visit(m.Expression).ToString(),
null,
null)));
}
if (m.Member.DeclaringType == typeof(DateTime) || m.Member.DeclaringType == typeof(DateTime?))
{
return(VisitDateTimeMemberAccess(m));
}
if (m.Expression != null && (m.Expression.NodeType == ExpressionType.Parameter ||
m.Expression.NodeType == ExpressionType.Convert))
{
var propertyInfo = m.Member as PropertyInfo;
return(new ColumnAccessPart(GetQuotedColumnName(m.Member.Name), propertyInfo.PropertyType));
}
var r = Expression.Lambda(m).Compile().DynamicInvoke();
return(r != null?AddParameter(r) : null);
}