sea_query/backend/sqlite/
foreign_key.rs

1use super::*;
2
3impl ForeignKeyBuilder for SqliteQueryBuilder {
4    fn prepare_table_ref_fk_stmt(&self, table_ref: &TableRef, sql: &mut dyn SqlWriter) {
5        match table_ref {
6            TableRef::Table(_) => self.prepare_table_ref_iden(table_ref, sql),
7            _ => panic!("Not supported"),
8        }
9    }
10
11    fn prepare_foreign_key_drop_statement_internal(
12        &self,
13        drop: &ForeignKeyDropStatement,
14        sql: &mut dyn SqlWriter,
15        mode: Mode,
16    ) {
17        if mode != Mode::Creation {
18            panic!("Sqlite does not support modification of foreign key constraints to existing tables");
19        }
20
21        write!(sql, "DROP FOREIGN KEY ").unwrap();
22        if let Some(name) = &drop.foreign_key.name {
23            write!(
24                sql,
25                "{}{}{}",
26                self.quote().left(),
27                name,
28                self.quote().right()
29            )
30            .unwrap();
31        }
32    }
33
34    fn prepare_foreign_key_create_statement_internal(
35        &self,
36        create: &ForeignKeyCreateStatement,
37        sql: &mut dyn SqlWriter,
38        mode: Mode,
39    ) {
40        if mode != Mode::Creation {
41            panic!("Sqlite does not support modification of foreign key constraints to existing tables");
42        }
43
44        write!(sql, "FOREIGN KEY (").unwrap();
45        create.foreign_key.columns.iter().fold(true, |first, col| {
46            if !first {
47                write!(sql, ", ").unwrap();
48            }
49            col.prepare(sql.as_writer(), self.quote());
50            false
51        });
52        write!(sql, ")").unwrap();
53
54        write!(sql, " REFERENCES ").unwrap();
55        if let Some(ref_table) = &create.foreign_key.ref_table {
56            self.prepare_table_ref_fk_stmt(ref_table, sql);
57        }
58        write!(sql, " (").unwrap();
59        create
60            .foreign_key
61            .ref_columns
62            .iter()
63            .fold(true, |first, col| {
64                if !first {
65                    write!(sql, ", ").unwrap();
66                }
67                col.prepare(sql.as_writer(), self.quote());
68                false
69            });
70        write!(sql, ")").unwrap();
71
72        if let Some(foreign_key_action) = &create.foreign_key.on_delete {
73            write!(sql, " ON DELETE ").unwrap();
74            self.prepare_foreign_key_action(foreign_key_action, sql);
75        }
76
77        if let Some(foreign_key_action) = &create.foreign_key.on_update {
78            write!(sql, " ON UPDATE ").unwrap();
79            self.prepare_foreign_key_action(foreign_key_action, sql);
80        }
81    }
82}
sea_query/backend/sqlite/foreign_key.rs

sea_query/backend/sqlite/
foreign_key.rs
