enhance(types):增加若干常用方法。

types/daterange.go

@@ -14,6 +14,18 @@ type DateRange struct {
 	pgtype.Range[Date]
 }
 
+func NewEmptyDateRange() DateRange {
+	return DateRange{
+		Range: pgtype.Range[Date]{
+			Lower:     MinDate(),
+			LowerType: pgtype.Unbounded,
+			Upper:     MaxDate(),
+			UpperType: pgtype.Unbounded,
+			Valid:     true,
+		},
+	}
+}
+
 func NewDateRange(lower *Date, upper *Date) DateRange {
 	return DateRange{
 		Range: pgtype.Range[Date]{
@@ -78,3 +90,23 @@ func (dr *DateRange) UnmarshalJSON(data []byte) error {
 	dr.Range = r
 	return nil
 }
+
+func (dr *DateRange) SetLower(lower Date, bound pgtype.BoundType) {
+	dr.Range.Lower = lower
+	dr.Range.LowerType = bound
+}
+
+func (dr *DateRange) SetLowerUnbounded() {
+	dr.Range.Lower = MinDate()
+	dr.Range.LowerType = pgtype.Unbounded
+}
+
+func (dr *DateRange) SetUpper(upper Date, bound pgtype.BoundType) {
+	dr.Range.Upper = upper
+	dr.Range.UpperType = bound
+}
+
+func (dr *DateRange) SetUpperUnbounded() {
+	dr.Range.Upper = MaxDate()
+	dr.Range.UpperType = pgtype.Unbounded
+}

types/datetimerange.go

@@ -14,6 +14,18 @@ type DateTimeRange struct {
 	pgtype.Range[DateTime]
 }
 
+func NewEmptyDateTimeRange() DateTimeRange {
+	return DateTimeRange{
+		Range: pgtype.Range[DateTime]{
+			Lower:     MinDateTime(),
+			LowerType: pgtype.Unbounded,
+			Upper:     MaxDateTime(),
+			UpperType: pgtype.Unbounded,
+			Valid:     true,
+		},
+	}
+}
+
 func NewDateTimeRange(lower *DateTime, upper *DateTime) DateTimeRange {
 	return DateTimeRange{
 		Range: pgtype.Range[DateTime]{
@@ -78,3 +90,23 @@ func (dr *DateTimeRange) UnmarshalJSON(data []byte) error {
 	dr.Range = r
 	return nil
 }
+
+func (dr *DateTimeRange) SetLower(lower DateTime, bound pgtype.BoundType) {
+	dr.Range.Lower = lower
+	dr.Range.LowerType = bound
+}
+
+func (dr *DateTimeRange) SetLowerUnbounded() {
+	dr.Range.Lower = MinDateTime()
+	dr.Range.LowerType = pgtype.Unbounded
+}
+
+func (dr *DateTimeRange) SetUpper(upper DateTime, bound pgtype.BoundType) {
+	dr.Range.Upper = upper
+	dr.Range.UpperType = bound
+}
+
+func (dr *DateTimeRange) SetUpperUnbounded() {
+	dr.Range.Upper = MaxDateTime()
+	dr.Range.UpperType = pgtype.Unbounded
+}