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            // Support only "naked" table names with no schema or alias.
7            TableRef::Table(TableName(None, _), None) => {
8                self.prepare_table_ref_iden(table_ref, sql)
9            }
10            _ => panic!("Not supported"),
11        }
12    }
13
14    fn prepare_foreign_key_drop_statement_internal(
15        &self,
16        drop: &ForeignKeyDropStatement,
17        sql: &mut dyn SqlWriter,
18        mode: Mode,
19    ) {
20        if mode != Mode::Creation {
21            panic!(
22                "Sqlite does not support modification of foreign key constraints to existing tables"
23            );
24        }
25
26        sql.write_str("DROP FOREIGN KEY ").unwrap();
27        if let Some(name) = &drop.foreign_key.name {
28            sql.write_char(self.quote().left()).unwrap();
29            sql.write_str(name).unwrap();
30            sql.write_char(self.quote().right()).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!(
42                "Sqlite does not support modification of foreign key constraints to existing tables"
43            );
44        }
45
46        sql.write_str("FOREIGN KEY (").unwrap();
47
48        let mut cols = create.foreign_key.columns.iter();
49        join_io!(
50            cols,
51            col,
52            join {
53                sql.write_str(", ").unwrap();
54            },
55            do {
56                self.prepare_iden(col, sql);
57            }
58        );
59
60        sql.write_str(") REFERENCES ").unwrap();
61        if let Some(ref_table) = &create.foreign_key.ref_table {
62            self.prepare_table_ref_fk_stmt(ref_table, sql);
63        }
64        sql.write_str(" (").unwrap();
65
66        let mut ref_cols = create.foreign_key.ref_columns.iter();
67        join_io!(
68            ref_cols,
69            col,
70            join {
71                sql.write_str(", ").unwrap();
72            },
73            do {
74                self.prepare_iden(col, sql);
75            }
76        );
77
78        sql.write_str(")").unwrap();
79
80        if let Some(foreign_key_action) = &create.foreign_key.on_delete {
81            sql.write_str(" ON DELETE ").unwrap();
82            self.prepare_foreign_key_action(foreign_key_action, sql);
83        }
84
85        if let Some(foreign_key_action) = &create.foreign_key.on_update {
86            sql.write_str(" ON UPDATE ").unwrap();
87            self.prepare_foreign_key_action(foreign_key_action, sql);
88        }
89    }
90}
sea_query/backend/sqlite/foreign_key.rs

sea_query/backend/sqlite/
foreign_key.rs
