public void Build(ISqExtensionBuilder builder)
{
var part = builder.GetValue <DateParts>("part");
var date = builder.GetExpression("date");
var number = builder.GetExpression("number", true);
switch (part)
{
case DateParts.Quarter:
part = DateParts.Month;
number = builder.Mul(number, 3);
break;
case DateParts.DayOfYear:
case DateParts.WeekDay:
part = DateParts.Day;
break;
case DateParts.Week:
part = DateParts.Day;
number = builder.Mul(number, 7);
break;
}
var partSql = new SqlExpression(part.ToString());
builder.ResultExpression = new SqlFunction(typeof(DateTime?), "DateAdd", partSql, number, date);
}
public void Build(ISqExtensionBuilder builder)
{
var part = builder.GetValue <DateParts>("part");
var date = builder.GetExpression("date");
var number = builder.GetExpression("number", true);
string function;
switch (part)
{
case DateParts.Year: function = "Add_Years"; break;
case DateParts.Quarter:
function = "Add_Months";
number = builder.Mul(number, 3);
break;
case DateParts.Month: function = "Add_Months"; break;
case DateParts.DayOfYear:
case DateParts.Day:
case DateParts.WeekDay: function = "Add_Days"; break;
case DateParts.Week:
function = "Add_Days";
number = builder.Mul(number, 7);
break;
case DateParts.Hour:
function = "Add_Seconds";
number = builder.Mul(number, 3600);
break;
case DateParts.Minute:
function = "Add_Seconds";
number = builder.Mul(number, 60);
break;
case DateParts.Second: function = "Add_Seconds"; break;
case DateParts.Millisecond:
function = "Add_Seconds";
number = builder.Div(number, 1000);
break;
default:
throw new InvalidOperationException($"Unexpected datepart: {part}");
}
builder.ResultExpression = new SqlFunction(typeof(DateTime?), function, date, number);
}
public void Build(ISqExtensionBuilder builder)
{
var part = builder.GetValue <DateParts>(0);
var startDate = builder.GetExpression(1);
var endDate = builder.GetExpression(2);
var secondsExpr = builder.Mul <int>(builder.Sub <int>(
new SqlFunction(typeof(int), "Days", endDate),
new SqlFunction(typeof(int), "Days", startDate)),
new SqlValue(86400));
var midnight = builder.Sub <int>(
new SqlFunction(typeof(int), "MIDNIGHT_SECONDS", endDate),
new SqlFunction(typeof(int), "MIDNIGHT_SECONDS", startDate));
var resultExpr = builder.Add <int>(secondsExpr, midnight);
switch (part)
{
case DateParts.Day: resultExpr = builder.Div(resultExpr, 86400); break;
case DateParts.Hour: resultExpr = builder.Div(resultExpr, 3600); break;
case DateParts.Minute: resultExpr = builder.Div(resultExpr, 60); break;
case DateParts.Second: break;
case DateParts.Millisecond:
resultExpr = builder.Add <int>(
builder.Mul(resultExpr, 1000),
builder.Div(
builder.Sub <int>(
new SqlFunction(typeof(int), "MICROSECOND", endDate),
new SqlFunction(typeof(int), "MICROSECOND", startDate)),
1000));
break;
default:
throw new InvalidOperationException($"Unexpected datepart: {part}");
}
builder.ResultExpression = resultExpr;
}