Class SQLUpdateCompiler

django.db.models.sql.compiler.SQLUpdateCompiler

Declaration

class SQLUpdateCompiler(SQLCompiler)

Methods

▶ def as_sql(self) override
Create the SQL for this query. Return the SQL string and list of parameters.
source link
This method overrides django.db.models.sql.compiler.SQLCompiler.as_sql.
Overrides
This method is overriden in:
- django.db.backends.mysql.compiler.SQLUpdateCompiler
▶ def execute_sql(self, result_type) override
Execute the specified update. Return the number of rows affected by
source link
This method overrides django.db.models.sql.compiler.SQLCompiler.execute_sql.
```
the primary update query. The "primary update query" is the first
non-empty query that is executed. Row counts for any subsequent,
related queries are not available.
```
▶ def pre_sql_setup(self) override
If the update depends on results from other tables, munge the "where" conditions to match the format required for (portable) SQL updates.
source link
This method overrides django.db.models.sql.compiler.SQLCompiler.pre_sql_setup.
```
If multiple updates are required, pull out the id values to update at
this point so that they don't change as a result of the progressive
updates.
```

Inherited methods

Subclasses

django.db.backends.mysql.compiler.SQLUpdateCompiler