Module schema_editor 

DDL generation for PostgreSQL, SQLite and MySQL.

PostgreSQL and SQLite identifiers are double-quoted (embedded " doubled). SQLite AlterField / RemoveField / constraint changes rebuild the table (create new, copy, drop, rename); the migrator disables foreign keys on the connection before BEGIN. MySQL has its own dialect (backticks, AUTO_INCREMENT, MODIFY COLUMN, no transactional DDL); see the mysql module. Other backends return MigrationError::UnsupportedBackend before any I/O.

Modules

mysql

MySQL / MariaDB DDL (MySQL 8.0.31+).

Structs

SqliteCastCheck

One SQLite CAST that needs a pre-copy loss check: sql returns a row when some non-NULL value in table.column would change under the cast.

SqliteRebuildTarget

SQLite rebuild target for op: the table being dropped plus the column sets before/after and the index names the rebuild itself recreates.

Functions

quote_ident

Quote ident with double quotes; embed a quote by doubling it.

quote_identifier

Quote ident for the SQL dialect of kind: backticks for MySQL, double quotes for everything else.

quote_string

Quote a SQL string literal with single quotes.

render

Render a single operation against the current schema state (before the op).

sqlite_lossy_cast_checks

Columns of op whose SQLite rebuild CAST could lose data.

sqlite_rebuild_target

Which table op rebuilds on SQLite, if any.

sqlite_sql_mentions_ident

Whether sql references identifier ident (a column or table name).

statements

Render operations against state, applying each to a cloned state so later ops see earlier ones (needed for SQLite rebuilds).