ExprIsNull: This class represents the IS NULL test.

In sqlq: 'SQL' Query Builder

This class represents the IS NULL test.

Description

This class represents the IS NULL test.

This class represents the IS NULL test.

Details

Used to test if a field is NULL inside a WHERE clause.

Super classes

sqlq::Statement -> sqlq::Expr -> sqlq::ExprComp -> ExprIsNull

Methods

Public methods

• ExprIsNull$new()

• ExprIsNull$getTokens()

• ExprIsNull$clone()

Inherited methods

• sqlq::Statement$toString()
• sqlq::ExprComp$enableParenthesis()

---

Method new()

Initializer.

Usage

ExprIsNull$new(expr, ...)

Arguments

expr

The Expr instance to test.

...

Arguments to pass to parent class.

Returns

Nothing.

---

Method getTokens()

Generates the list of tokens representing this statement.

Usage

ExprIsNull$getTokens()

Returns

A list of Token objects.

---

Method clone()

The objects of this class are cloneable with this method.

Usage

ExprIsNull$clone(deep = FALSE)

Arguments

deep

Whether to make a deep clone.

Examples

# To generate a NULL test:
ExprIsNull$new(ExprField$new("title"))

sqlq documentation built on Sept. 16, 2025, 9:10 a.m.