Module expression

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.

Structs

• SqlLiteral
  Returned by the sql() function.
• UncheckedBind
  Returned by the SqlLiteral::bind() method when binding a value to a fragment of SQL.

Traits

• AppearsOnTable
  Indicates that all elements of an expression are valid given a from clause.
• AsExpression
  Converts a type to its representation for use in Diesel’s query builder.
• AsExpressionList
  Converts a tuple of values into a tuple of Diesel expressions.
• BoxableExpression
  Helper trait used when boxing expressions.
• Expression
  Represents a typed fragment of SQL.
• IntoSql
  Converts a type to its representation for use in Diesel’s query builder.
• NonAggregate
  Marker trait to indicate that an expression does not include any aggregate functions.
• SelectableExpression
  Indicates that an expression can be selected from a source.