Module diesel::prelude

Re-exports important traits and types. Meant to be glob imported when using Diesel.

Re-exports

pub use crate::expression::SelectableHelper;

Macros

allow_columns_to_appear_in_same_group_by_clause	Allow two or more columns which are otherwise unrelated to be used together in a group by clause.
allow_tables_to_appear_in_same_query	Allow two or more tables which are otherwise unrelated to be used together in a query.
joinable	Allow two tables to be referenced in a join query without providing an explicit ON clause.
sql_function	Declare a sql function for use in your code.
table	Specifies that a table exists, and what columns it has. This will create a new public module, with the same name, as the name of the table. In this module, you’ll find a unit struct named table, and a unit struct with the names of each of the columns.

Structs

MysqlConnection	A connection to a MySQL database. Connection URLs should be in the form mysql://[user[:password]@]host/database_name
PgConnection	The connection string expected by PgConnection::establish should be a PostgreSQL connection string, as documented at https://www.postgresql.org/docs/9.4/static/libpq-connect.html#LIBPQ-CONNSTRING
SqliteConnection	Connections for the SQLite backend. Unlike other backends, SQLite supported connection URLs are:

Enums

ConnectionError

Errors which can occur during Connection::establish

Traits

AppearsOnTable	Indicates that all elements of an expression are valid given a from clause.
AsChangeset	Types which can be passed to update.set.
BelongingToDsl	Constructs a query that finds record(s) based on directional association with other record(s).
BoolExpressionMethods	Methods present on boolean expressions
BoxableExpression	Helper trait used when boxing expressions.
Column	A column on a database table. Types which implement this trait should have been generated by the table! macro.
CombineDsl	Extension trait to combine queries using a combinator like UNION, INTERSECT or EXPECT with or without ALL rule for duplicates
Connection	A connection to a database
DecoratableTarget	Interface to add information to conflict targets. Designed to be open for further additions to conflict targets like constraints
EscapeExpressionMethods	Adds the escape method to LIKE and NOT LIKE. This is used to specify the escape character for the pattern.
Expression	Represents a typed fragment of SQL.
ExpressionMethods	Methods present on all expressions, except tuples
GroupedBy	The grouped_by function groups records by their parent.
Identifiable	This trait indicates that a struct represents a single row in a database table.
Insertable	Represents that a structure can be used to insert a new row into the database. This is automatically implemented for &[T] and &Vec<T> for inserting more than one record.
IntoSql	Converts a type to its representation for use in Diesel’s query builder.
JoinOnDsl	Specify the ON clause for a join statement. This will override any implicit ON clause that would come from joinable!
JoinTo	Indicates that two tables can be joined without an explicit ON clause.
NullableExpressionMethods	Methods present on all expressions
OptionalExtension	See the method documentation.
PgArrayExpressionMethods	PostgreSQL specific methods present on array expressions.
PgExpressionMethods	PostgreSQL specific methods which are present on all expressions.
PgNetExpressionMethods	PostgreSQL specific methods present between CIDR/INET expressions
PgRangeExpressionMethods	PostgreSQL specific methods present on range expressions.
PgSortExpressionMethods	PostgreSQL expression methods related to sorting.
PgTextExpressionMethods	PostgreSQL specific methods present on text expressions.
PgTimestampExpressionMethods	PostgreSQL specific methods present on timestamp expressions.
QueryDsl	Methods used to construct select statements.
QuerySource	Represents a type which can appear in the FROM clause. Apps should not need to concern themselves with this trait.
Queryable	Trait indicating that a record can be queried from the database.
QueryableByName	Deserializes the result of a query constructed with sql_query.
RunQueryDsl	Methods used to execute queries.
SaveChangesDsl	Sugar for types which implement both AsChangeset and Identifiable
Selectable	Trait indicating that a record can be selected and queried from the database.
SelectableExpression	Indicates that an expression can be selected from a source.
SqliteExpressionMethods	Sqlite specific methods which are present on all expressions.
Table	A SQL database table. Types which implement this trait should have been generated by the table! macro.
TextExpressionMethods	Methods present on text expressions

Type Definitions

ConnectionResult	A specialized result type for establishing connections.
QueryResult	A specialized result type for queries.

Derive Macros

AsChangeset	Implements AsChangeset
Associations	Implement required traits for the associations API
Identifiable	Implements Identifiable for references of the current type
Insertable	Implements Insertable
Queryable	Implements Queryable to load the result of statically typed queries
QueryableByName	Implements QueryableByName for untyped sql queries, such as that one generated by sql_query
Selectable	Implements Selectable