Module diesel::expression
source · [−]Expand description
AST types representing various typed SQL expressions.
Almost all types implement either Expression or
AsExpression.
The most common expression to work with is a
Column. There are various methods
that you can call on these, found in
expression_methods.
You can also use numeric operators such as + on expressions of the
appropriate type.
Any primitive which implements ToSql will
also implement AsExpression, allowing it to be
used as an argument to any of the methods described here.
Modules
Possible types for []
Expression::SqlType]Helper macros to define custom sql functions
Possible values for
ValidGrouping::IsAggregateStructs
Returned by the
sql() function.Returned by the
SqlLiteral::bind() method when binding a value to a fragment of SQL.Traits
Indicates that all elements of an expression are valid given a from clause.
Converts a type to its representation for use in Diesel’s query builder.
Converts a tuple of values into a tuple of Diesel expressions.
Helper trait used when boxing expressions.
Represents a typed fragment of SQL.
Converts a type to its representation for use in Diesel’s query builder.
Can two
IsAggregate types appear in the same expression?NonAggregateNon-
unstableTrait alias to represent an expression that isn’t aggregate by default.
A helper to translate type level sql type information into
runtime type information for specific queries
Trait indicating that a record can be selected and queried from the database.
Indicates that an expression can be selected from a source.
This helper trait provides several methods for
constructing a select or returning clause based on a
Selectable implementation.Marker trait for possible types of
Expression::SqlTypeIs this expression valid for a given group by clause?
Derive Macros
Implements all required variants of
AsExpressionImplements
SelectableImplements
ValidGrouping