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 impl SqlWriter) {
5        match table_ref {
6            // Support "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            // Support table names with a schema, by stripping it; it's not allowed in foreign key
11            // syntax: https://www.sqlite.org/syntaxdiagrams.html#foreign-key-clause
12            TableRef::Table(TableName(Some(_), iden), None) => self
13                .prepare_table_ref_iden(&TableRef::Table(TableName(None, iden.clone()), None), sql),
14            // Aliased table names are not allowed.
15            _ => panic!("Not supported"),
16        }
17    }
18
19    fn prepare_foreign_key_drop_statement_internal(
20        &self,
21        drop: &ForeignKeyDropStatement,
22        sql: &mut impl SqlWriter,
23        mode: Mode,
24    ) {
25        if mode != Mode::Creation {
26            panic!(
27                "Sqlite does not support modification of foreign key constraints to existing tables"
28            );
29        }
30
31        sql.write_str("DROP FOREIGN KEY ").unwrap();
32        if let Some(name) = &drop.foreign_key.name {
33            sql.write_char(self.quote().left()).unwrap();
34            sql.write_str(name).unwrap();
35            sql.write_char(self.quote().right()).unwrap();
36        }
37    }
38
39    fn prepare_foreign_key_create_statement_internal(
40        &self,
41        create: &ForeignKeyCreateStatement,
42        sql: &mut impl SqlWriter,
43        mode: Mode,
44    ) {
45        if mode != Mode::Creation {
46            panic!(
47                "Sqlite does not support modification of foreign key constraints to existing tables"
48            );
49        }
50
51        sql.write_str("FOREIGN KEY (").unwrap();
52
53        let mut cols = create.foreign_key.columns.iter();
54        join_io!(
55            cols,
56            col,
57            join {
58                sql.write_str(", ").unwrap();
59            },
60            do {
61                self.prepare_iden(col, sql);
62            }
63        );
64
65        sql.write_str(") REFERENCES ").unwrap();
66        if let Some(ref_table) = &create.foreign_key.ref_table {
67            self.prepare_table_ref_fk_stmt(ref_table, sql);
68        }
69        sql.write_str(" (").unwrap();
70
71        let mut ref_cols = create.foreign_key.ref_columns.iter();
72        join_io!(
73            ref_cols,
74            col,
75            join {
76                sql.write_str(", ").unwrap();
77            },
78            do {
79                self.prepare_iden(col, sql);
80            }
81        );
82
83        sql.write_str(")").unwrap();
84
85        if let Some(foreign_key_action) = &create.foreign_key.on_delete {
86            sql.write_str(" ON DELETE ").unwrap();
87            self.prepare_foreign_key_action(foreign_key_action, sql);
88        }
89
90        if let Some(foreign_key_action) = &create.foreign_key.on_update {
91            sql.write_str(" ON UPDATE ").unwrap();
92            self.prepare_foreign_key_action(foreign_key_action, sql);
93        }
94    }
95}
sea_query/backend/sqlite/foreign_key.rs

sea_query/backend/sqlite/
foreign_key.rs
