Trait LengthPolicy 

pub trait LengthPolicy<D>: DataType {
    type Output: DataType;
}

Result type of length, char_length and octet_length for a text SQL type on dialect D: INTEGER on SQLite, int4 on PostgreSQL, BIGINT on MySQL.

Required Associated Types

type Output: DataType

Result type of the length functions.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl LengthPolicy<MySQLDialect> for Char

type Output = BigInt

impl LengthPolicy<MySQLDialect> for Enum

type Output = BigInt

impl LengthPolicy<MySQLDialect> for LongText

type Output = BigInt

impl LengthPolicy<MySQLDialect> for MediumText

type Output = BigInt

impl LengthPolicy<MySQLDialect> for Set

type Output = BigInt

impl LengthPolicy<MySQLDialect> for Text

type Output = BigInt

impl LengthPolicy<MySQLDialect> for TinyText

type Output = BigInt

impl LengthPolicy<MySQLDialect> for Varchar

type Output = BigInt

impl LengthPolicy<PostgresDialect> for Char

type Output = Int4

impl LengthPolicy<PostgresDialect> for Text

type Output = Int4

impl LengthPolicy<PostgresDialect> for Varchar

type Output = Int4

impl LengthPolicy<SQLiteDialect> for Any

type Output = Integer

impl LengthPolicy<SQLiteDialect> for Text

type Output = Integer

Implementors