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($"Unexpected datepart: {part}");
}
builder.ResultExpression = resultExpr;
}
public void Build(ISqExtensionBuilder builder)
{
var part = builder.GetValue <DateParts>("part");
var date = builder.GetExpression("date");
var number = builder.GetExpression("number", true);
string expStr;
switch (part)
{
case DateParts.Year: expStr = "{0} * Interval '1 Year'"; break;
case DateParts.Quarter: expStr = "{0} * Interval '1 Month' * 3"; break;
case DateParts.Month: expStr = "{0} * Interval '1 Month'"; break;
case DateParts.DayOfYear:
case DateParts.WeekDay:
case DateParts.Day: expStr = "{0} * Interval '1 Day'"; break;
case DateParts.Week: expStr = "{0} * Interval '1 Day' * 7"; break;
case DateParts.Hour: expStr = "{0} * Interval '1 Hour'"; break;
case DateParts.Minute: expStr = "{0} * Interval '1 Minute'"; break;
case DateParts.Second: expStr = "{0} * Interval '1 Second'"; break;
case DateParts.Millisecond: expStr = "{0} * Interval '1 Millisecond'"; break;
default:
throw new InvalidOperationException($"Unexpected datepart: {part}");
}
builder.ResultExpression = builder.Add(
date,
new SqlExpression(typeof(TimeSpan?), expStr, Precedence.Multiplicative, number),
typeof(DateTime?));
}
public void Build(ISqExtensionBuilder builder)
{
var part = builder.GetValue <DateParts>("part");
var date = builder.GetExpression("date");
var number = builder.GetExpression("number", true);
string expStr;
switch (part)
{
case DateParts.Year: expStr = "{0} Year"; break;
case DateParts.Quarter: expStr = "({0} * 3) Month"; break;
case DateParts.Month: expStr = "{0} Month"; break;
case DateParts.DayOfYear:
case DateParts.WeekDay:
case DateParts.Day: expStr = "{0} Day"; break;
case DateParts.Week: expStr = "({0} * 7) Day"; break;
case DateParts.Hour: expStr = "{0} Hour"; break;
case DateParts.Minute: expStr = "{0} Minute"; break;
case DateParts.Second: expStr = "{0} Second"; break;
case DateParts.Millisecond: expStr = "({0} / 1000.0) Second"; break;
default:
throw new InvalidOperationException($"Unexpected datepart: {part}");
}
builder.ResultExpression = builder.Add(
date,
new SqlExpression(typeof(TimeSpan?), expStr, Precedence.Primary, number),
typeof(DateTime?));
}
public void Build(ISqExtensionBuilder builder)
{
var part = builder.GetValue <DateParts>("part");
var date = builder.GetExpression("date");
var number = builder.GetExpression("number", true);
string expStr;
switch (part)
{
case DateParts.Year: expStr = "{0} * INTERVAL '1' YEAR"; break;
case DateParts.Quarter: expStr = "{0} * INTERVAL '3' MONTH"; break;
case DateParts.Month: expStr = "{0} * INTERVAL '1' MONTH"; break;
case DateParts.DayOfYear:
case DateParts.WeekDay:
case DateParts.Day: expStr = "{0} * INTERVAL '1' DAY"; break;
case DateParts.Week: expStr = "{0} * INTERVAL '7' DAY"; break;
case DateParts.Hour: expStr = "{0} * INTERVAL '1' HOUR"; break;
case DateParts.Minute: expStr = "{0} * INTERVAL '1' MINUTE"; break;
case DateParts.Second: expStr = "{0} * INTERVAL '1' SECOND"; break;
case DateParts.Millisecond: expStr = "{0} * INTERVAL '0.001' SECOND"; break;
default:
throw new InvalidOperationException($"Unexpected datepart: {part}");
}
builder.ResultExpression = builder.Add(
date,
new SqlExpression(typeof(TimeSpan?), expStr, Precedence.Multiplicative, number),
typeof(DateTime?));
}