DateTimeModifier class final

DateTime modifier constants.

These modifiers are used on DateTimeExpressions.modify and DateTimeExpressions.modifyAll to apply transformations on date time values.

For instance, DateTimeModifier.days can be used to add or subtract calendar days from a date time value. Note that this is different from just subtracting a duration with DateTimeExpressions.+, which only adds a duration as seconds without respecting calendar units.

For another explanation of modifiers, see the sqlite3 docs.

Inheritance
Available extensions

Constructors

DateTimeModifier.days(int days)
Adds or subtracts days calendar days from the date time value.
const
DateTimeModifier.hours(int hours)
Adds or subtracts hours hours from this date time value.
const
DateTimeModifier.localTime()
Move a date time that is in UTC to the local time zone.
const
DateTimeModifier.minutes(int minutes)
Adds or subtracts minutes minutes from this date time value.
const
DateTimeModifier.months(int months)
Adds or subtracts months months from this date time value.
const
DateTimeModifier.seconds(num seconds)
Adds or subtracts seconds seconds from this date time value.
const
DateTimeModifier.startOfDay()
The "start of day" modifier shifts the date backwards to the beginning of the day.
const
DateTimeModifier.startOfMonth()
The "start of month" modifier shifts the date backwards to the beginning of the month.
const
DateTimeModifier.startOfYear()
The "start of year" modifier shifts the date backwards to the beginning of the year.
const
DateTimeModifier.utc()
Move a date time that is in the local time zone back to UTC.
const
DateTimeModifier.weekday(int weekday)
The "weekday" modifier shifts the date forward to the next date where the weekday is the weekday provided here.
DateTimeModifier.years(int years)
Adds or subtracts years years from this date time value.
const

Properties

driftSqlType → BaseSqlType<String>
The BaseSqlType backing this expression.
no setterinherited
hashCode → int
The hash code for this object.
no setterinherited
isLiteral → bool
Whether this expression is a literal. Some use-sites need to put parentheses around non-literals.
no setterinherited
length → Expression<int>

Available on Expression<String>, provided by the StringExpressionOperators extension

Calls the sqlite function LENGTH on this string, which counts the number of characters in this string. Note that, in most sqlite installations, length may not support all unicode rules.
no setter
precedence → Precedence
The precedence of this expression. This can be used to automatically put parentheses around expressions as needed.
no setterinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
value → String?
The value that will be converted to an sql literal.
finalinherited

Methods

caseMatch<T extends Object>({required Map<Expression<String>, Expression<T>> when, Expression<T>? orElse}) → Expression<T>
A CASE WHEN construct using the current expression as a base.
inherited
cast<D2 extends Object>([BaseSqlType<D2>? type]) → Expression<D2>
Generates a CAST(expression AS TYPE) expression.
inherited
collate(Collate collate) → Expression<String>

Available on Expression<String>, provided by the StringExpressionOperators extension

Uses the given collate sequence when comparing this column to other values.
contains(String substring) → Expression<bool>

Available on Expression<String>, provided by the StringExpressionOperators extension

Whether this expression contains substring.
dartCast<D2 extends Object>({CustomSqlType<D2>? customType}) → Expression<D2>
Casts this expression to an expression of D.
inherited
equals(String compare) → Expression<bool>
Whether this column is equal to the given value, which must have a fitting type. The compare value will be written as a variable using prepared statements, so there is no risk of an SQL-injection.
inherited
equalsExp(Expression<String> compare) → Expression<bool>
Whether this expression is equal to the given expression.
inherited
equalsNullable(String? compare) → Expression<bool>
Compares the value of this column to compare or null.
inherited
iif<T extends Object>(Expression<bool> predicate, Expression<T> ifFalse) → Expression<T>
Evaluates to this if predicate is true, otherwise evaluates to ifFalse.
inherited
isExp(Expression<String> other) → Expression<bool>
Generates an IS expression in SQL, comparing this expression with the other expression.
inherited
isIn(Iterable<String> values) → Expression<bool>
An expression that is true if this resolves to any of the values in values.
inherited
isInExp(List<Expression<String>> expressions) → Expression<bool>
An expression that evaluates to true if this expression resolves to a value that one of the expressions resolve to as well.
inherited
isInQuery(BaseSelectStatement select) → Expression<bool>
An expression checking whether this is included in any row of the provided select statement.
inherited
isNotExp(Expression<String> other) → Expression<bool>
Generates an IS NOT expression in SQL, comparing this expression with the other expression.
inherited
isNotIn(Iterable<String> values) → Expression<bool>
An expression that is true if this does not resolve to any of the values in values.
inherited
isNotInExp(List<Expression<String>> expressions) → Expression<bool>
An expression that evaluates to true if this expression does not resolve to any value that the expressions resolve to.
inherited
isNotInQuery(BaseSelectStatement select) → Expression<bool>
An expression checking whether this is not included in any row of the provided select statement.
inherited
isNotNull() → Expression<bool>
Expression that is true if the inner expression resolves to a non-null value.
inherited
isNotValue(String value) → Expression<bool>
Generates an IS NOT expression in SQL, comparing this expression with the Dart value.
inherited
isNull() → Expression<bool>
Expression that is true if the inner expression resolves to a null value.
inherited
isValue(String value) → Expression<bool>
Generates an IS expression in SQL, comparing this expression with the Dart value.
inherited
like(String regex, {String? escapeChar}) → Expression<bool>

Available on Expression<String>, provided by the StringExpressionOperators extension

Whether this column matches the given expression.
likeExp(Expression<String> regex, {Expression<String>? escape}) → Expression<bool>

Available on Expression<String>, provided by the StringExpressionOperators extension

Whether this column matches the given expression.
lower() → Expression<String>

Available on Expression<String>, provided by the StringExpressionOperators extension

Calls the sqlite function LOWER on this string. Please note that, in most sqlite installations, this only affects ascii chars.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
nullIf(Expression<String> matcher) → Expression<String>
Returns null if matcher is equal to this expression, this otherwise.
inherited
regexp(String regex, {bool multiLine = false, bool caseSensitive = true, bool unicode = false, bool dotAll = false}) → Expression<bool>

Available on Expression<String>, provided by the StringExpressionOperators extension

Matches this string against the regular expression in regex.
substr(int start, [int? length]) → Expression<String>

Available on Expression<String>, provided by the StringExpressionOperators extension

Calls the substr function on this string.
substrExpr(Expression<int> start, [Expression<int>? length]) → Expression<String>

Available on Expression<String>, provided by the StringExpressionOperators extension

Calls the substr function with arbitrary expressions as arguments.
toString() → String
A string representation of this object.
inherited
trim() → Expression<String>

Available on Expression<String>, provided by the StringExpressionOperators extension

Removes spaces from both ends of this string.
trimLeft() → Expression<String>

Available on Expression<String>, provided by the StringExpressionOperators extension

Removes spaces from the beginning of this string.
trimRight() → Expression<String>

Available on Expression<String>, provided by the StringExpressionOperators extension

Removes spaces from the end of this string.
upper() → Expression<String>

Available on Expression<String>, provided by the StringExpressionOperators extension

Calls the sqlite function UPPER on this string. Please note that, in most sqlite installations, this only affects ascii chars.
writeAroundPrecedence(GenerationContext context, Precedence precedence) → void
Writes this expression into the GenerationContext, assuming that there's an outer expression with precedence. If the Expression.precedence of this expression is lower, it will be wrap}ped in
inherited
writeInner(GenerationContext ctx, Expression<Object> inner) → void
If this Expression wraps an inner expression, this utility method can be used inside writeInto to write that inner expression while wrapping it in parentheses if necessary.
inherited
writeInto(GenerationContext context) → void
Writes this component into the context by writing to its GenerationContext.buffer or by introducing bound variables. When writing into the buffer, no whitespace around the this component should be introduced. When a component consists of multiple composed component, it's responsible for introducing whitespace between its child components.
inherited

Operators

operator +(Expression<String> other) → Expression<String>

Available on Expression<String>, provided by the StringExpressionOperators extension

Performs a string concatenation in sql by appending other to this.
operator ==(Object other) → bool
The equality operator.
inherited