sea_query/backend/mysql/
foreign_key.rs

1use super::*;
2
3impl ForeignKeyBuilder for MysqlQueryBuilder {
4    fn prepare_table_ref_fk_stmt(&self, table_ref: &TableRef, sql: &mut impl 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 impl SqlWriter,
18        mode: Mode,
19    ) {
20        if mode == Mode::Alter {
21            sql.write_str("ALTER TABLE ").unwrap();
22            if let Some(table) = &drop.table {
23                self.prepare_table_ref_fk_stmt(table, sql);
24            }
25            sql.write_str(" ").unwrap();
26        }
27
28        sql.write_str("DROP FOREIGN KEY ").unwrap();
29        if let Some(name) = &drop.foreign_key.name {
30            sql.write_char(self.quote().left()).unwrap();
31            sql.write_str(name).unwrap();
32            sql.write_char(self.quote().right()).unwrap();
33        }
34    }
35
36    fn prepare_foreign_key_create_statement_internal(
37        &self,
38        create: &ForeignKeyCreateStatement,
39        sql: &mut impl SqlWriter,
40        mode: Mode,
41    ) {
42        if mode == Mode::Alter {
43            sql.write_str("ALTER TABLE ").unwrap();
44            if let Some(table) = &create.foreign_key.table {
45                self.prepare_table_ref_fk_stmt(table, sql);
46            }
47            sql.write_str(" ").unwrap();
48        }
49
50        if mode != Mode::Creation {
51            sql.write_str("ADD ").unwrap();
52        }
53
54        sql.write_str("CONSTRAINT ").unwrap();
55        if let Some(name) = &create.foreign_key.name {
56            sql.write_char(self.quote().left()).unwrap();
57            sql.write_str(name).unwrap();
58            sql.write_char(self.quote().right()).unwrap();
59        }
60        sql.write_str(" FOREIGN KEY (").unwrap();
61
62        let mut fk_cols = create.foreign_key.columns.iter();
63
64        if let Some(col) = fk_cols.next() {
65            self.prepare_iden(col, sql);
66        }
67
68        for col in fk_cols {
69            sql.write_str(", ").unwrap();
70            self.prepare_iden(col, sql);
71        }
72
73        sql.write_str(") REFERENCES ").unwrap();
74        if let Some(ref_table) = &create.foreign_key.ref_table {
75            self.prepare_table_ref_fk_stmt(ref_table, sql);
76        }
77        sql.write_str(" (").unwrap();
78
79        let mut fk_ref_cols = create.foreign_key.ref_columns.iter();
80        if let Some(col) = fk_ref_cols.next() {
81            self.prepare_iden(col, sql);
82        }
83
84        for col in fk_ref_cols {
85            sql.write_str(", ").unwrap();
86            self.prepare_iden(col, sql);
87        }
88
89        sql.write_str(")").unwrap();
90
91        if let Some(foreign_key_action) = &create.foreign_key.on_delete {
92            sql.write_str(" ON DELETE ").unwrap();
93            self.prepare_foreign_key_action(foreign_key_action, sql);
94        }
95
96        if let Some(foreign_key_action) = &create.foreign_key.on_update {
97            sql.write_str(" ON UPDATE ").unwrap();
98            self.prepare_foreign_key_action(foreign_key_action, sql);
99        }
100    }
101}
sea_query/backend/mysql/foreign_key.rs

sea_query/backend/mysql/
foreign_key.rs
