diesel

Module dsl

Source
Expand description

Includes various helper types and bare functions which are named too generically to be included in prelude, but are often used when using Diesel.

Re-exports§

  • pub use crate::pg::expression::dsl::*;
    postgres_backend
  • pub use crate::sqlite::expression::dsl::*;
    sqlite

Structs§

  • CountDistinct
  • CountStar
  • DuplicatedKeysmysql_backend
    A marker type signaling that the given ON CONFLICT clause uses mysql’s ON DUPLICATE KEY syntax that triggers on all unique constraints
  • now
    Represents the SQL CURRENT_TIMESTAMP constant. This is equivalent to the NOW() function on backends that support it.
  • today
    Represents the SQL CURRENT_DATE constant.

Traits§

Functions§

  • avg
    Represents a SQL AVG function. This function can only take types which are Foldable.
  • case_when
    Creates a SQL CASE WHEN ... END expression
  • copy_frompostgres_backend
    Creates a COPY FROM statement
  • copy_topostgres_backend
    Creates a COPY TO statement
  • count
    Creates a SQL COUNT expression
  • count_distinct
    Creates a SQL COUNT(DISTINCT ...) expression
  • count_star
    Creates a SQL COUNT(*) expression
  • date
    Represents the SQL DATE function. The argument should be a Timestamp expression, and the return value will be an expression of type Date.
  • delete
    Creates a DELETE statement.
  • existsi-implement-a-third-party-backend-and-opt-into-breaking-changes
    Creates a SQL EXISTS expression.
  • insert_into
    Creates an INSERT statement for the target table.
  • insert_or_ignore_into
    Creates an INSERT [OR] IGNORE statement.
  • max
    Represents a SQL MAX function. This function can only take types which are ordered.
  • min
    Represents a SQL MIN function. This function can only take types which are ordered.
  • not
    Creates a SQL NOT expression
  • replace_into
    Creates a REPLACE statement.
  • select
    Creates a bare select statement, with no from clause. Primarily used for testing diesel itself, but likely useful for third party crates as well. The given expressions must be selectable from anywhere.
  • sql
    Use literal SQL in the query builder.
  • sql_query
    Construct a full SQL query using raw SQL.
  • sum
    Represents a SQL SUM function. This function can only take types which are Foldable.
  • update
    Creates an UPDATE statement.

Type Aliases§

Attribute Macros§

  • auto_type
    Automatically annotates return type of a query fragment function