Class Statement

django/db/backends/ddl_references.py:194–236

Statement template and formatting parameters container. Allows keeping a reference to a statement without interpolating identifiers that might have to be adjusted if they're referencing a table or column that is removed

class Statement(Reference):
    """
    Statement template and formatting parameters container.

    Allows keeping a reference to a statement without interpolating identifiers
    that might have to be adjusted if they're referencing a table or column
    that is removed
    """

    def __init__(self, template, **parts):
        self.template = template
        self.parts = parts

    def references_table(self, table):
        return any(
            hasattr(part, "references_table") and part.references_table(table)
            for part in self.parts.values()
        )

    def references_column(self, table, column):
        return any(
            hasattr(part, "references_column") and part.references_column(table, column)
            for part in self.parts.values()
        )

    def references_index(self, table, index):
        return any(
            hasattr(part, "references_index") and part.references_index(table, index)
            for part in self.parts.values()
        )

    def rename_table_references(self, old_table, new_table):
        for part in self.parts.values():
            if hasattr(part, "rename_table_references"):
                part.rename_table_references(old_table, new_table)

    def rename_column_references(self, table, old_column, new_column):
        for part in self.parts.values():
            if hasattr(part, "rename_column_references"):
                part.rename_column_references(table, old_column, new_column)

    def __str__(self):
        return self.template % self.parts


class Expressions(TableColumns):