Add referential actions to TableConstraint foreign key (#306)

* Add referential actions to TableConstraint foreign key

* Remove copy/paste error

* Add referential actions to TableConstraint foreign key

* Add additional tests

src/ast/ddl.rs

@@ -136,12 +136,17 @@ pub enum TableConstraint {
         is_primary: bool,
     },
     /// A referential integrity constraint (`[ CONSTRAINT <name> ] FOREIGN KEY (<columns>)
-    /// REFERENCES <foreign_table> (<referred_columns>)`)
+    /// REFERENCES <foreign_table> (<referred_columns>)
+    /// { [ON DELETE <referential_action>] [ON UPDATE <referential_action>] |
+    ///   [ON UPDATE <referential_action>] [ON DELETE <referential_action>]
+    /// }`).
     ForeignKey {
         name: Option<Ident>,
         columns: Vec<Ident>,
         foreign_table: ObjectName,
         referred_columns: Vec<Ident>,
+        on_delete: Option<ReferentialAction>,
+        on_update: Option<ReferentialAction>,
     },
     /// `[ CONSTRAINT <name> ] CHECK (<expr>)`
     Check {
@@ -169,14 +174,25 @@ impl fmt::Display for TableConstraint {
                 columns,
                 foreign_table,
                 referred_columns,
-            } => write!(
+                on_delete,
+                on_update,
+            } => {
+                write!(
                     f,
                     "{}FOREIGN KEY ({}) REFERENCES {}({})",
                     display_constraint_name(name),
                     display_comma_separated(columns),
                     foreign_table,
-                display_comma_separated(referred_columns)
+                    display_comma_separated(referred_columns),
-            ),
+                )?;
+                if let Some(action) = on_delete {
+                    write!(f, " ON DELETE {}", action)?;
+                }
+                if let Some(action) = on_update {
+                    write!(f, " ON UPDATE {}", action)?;
+                }
+                Ok(())
+            }
             TableConstraint::Check { name, expr } => {
                 write!(f, "{}CHECK ({})", display_constraint_name(name), expr)
             }

src/parser.rs

@@ -1741,11 +1741,26 @@ impl<'a> Parser<'a> {
                 self.expect_keyword(Keyword::REFERENCES)?;
                 let foreign_table = self.parse_object_name()?;
                 let referred_columns = self.parse_parenthesized_column_list(Mandatory)?;
+                let mut on_delete = None;
+                let mut on_update = None;
+                loop {
+                    if on_delete.is_none() && self.parse_keywords(&[Keyword::ON, Keyword::DELETE]) {
+                        on_delete = Some(self.parse_referential_action()?);
+                    } else if on_update.is_none()
+                        && self.parse_keywords(&[Keyword::ON, Keyword::UPDATE])
+                    {
+                        on_update = Some(self.parse_referential_action()?);
+                    } else {
+                        break;
+                    }
+                }
                 Ok(Some(TableConstraint::ForeignKey {
                     name,
                     columns,
                     foreign_table,
                     referred_columns,
+                    on_delete,
+                    on_update,
                 }))
             }
             Token::Word(w) if w.keyword == Keyword::CHECK => {

tests/sqlparser_common.rs

@@ -1162,7 +1162,11 @@ fn parse_create_table() {
                lng DOUBLE,
                constrained INT NULL CONSTRAINT pkey PRIMARY KEY NOT NULL UNIQUE CHECK (constrained > 0),
                ref INT REFERENCES othertable (a, b),\
-               ref2 INT references othertable2 on delete cascade on update no action\
+               ref2 INT references othertable2 on delete cascade on update no action,\
+               constraint fkey foreign key (lat) references othertable3 (lat) on delete restrict,\
+               constraint fkey2 foreign key (lat) references othertable4(lat) on delete no action on update restrict, \
+               foreign key (lat) references othertable4(lat) on update set default on delete cascade, \
+               FOREIGN KEY (lng) REFERENCES othertable4 (longitude) ON UPDATE SET NULL
                )";
     let ast = one_statement_parses_to(
         sql,
@@ -1172,7 +1176,11 @@ fn parse_create_table() {
          lng DOUBLE, \
          constrained INT NULL CONSTRAINT pkey PRIMARY KEY NOT NULL UNIQUE CHECK (constrained > 0), \
          ref INT REFERENCES othertable (a, b), \
-         ref2 INT REFERENCES othertable2 ON DELETE CASCADE ON UPDATE NO ACTION)",
+         ref2 INT REFERENCES othertable2 ON DELETE CASCADE ON UPDATE NO ACTION, \
+         CONSTRAINT fkey FOREIGN KEY (lat) REFERENCES othertable3(lat) ON DELETE RESTRICT, \
+         CONSTRAINT fkey2 FOREIGN KEY (lat) REFERENCES othertable4(lat) ON DELETE NO ACTION ON UPDATE RESTRICT, \
+         FOREIGN KEY (lat) REFERENCES othertable4(lat) ON DELETE CASCADE ON UPDATE SET DEFAULT, \
+         FOREIGN KEY (lng) REFERENCES othertable4(longitude) ON UPDATE SET NULL)",
     );
     match ast {
         Statement::CreateTable {
@@ -1271,7 +1279,43 @@ fn parse_create_table() {
                     }
                 ]
             );
-            assert!(constraints.is_empty());
+            assert_eq!(
+                constraints,
+                vec![
+                    TableConstraint::ForeignKey {
+                        name: Some("fkey".into()),
+                        columns: vec!["lat".into()],
+                        foreign_table: ObjectName(vec!["othertable3".into()]),
+                        referred_columns: vec!["lat".into()],
+                        on_delete: Some(ReferentialAction::Restrict),
+                        on_update: None
+                    },
+                    TableConstraint::ForeignKey {
+                        name: Some("fkey2".into()),
+                        columns: vec!["lat".into()],
+                        foreign_table: ObjectName(vec!["othertable4".into()]),
+                        referred_columns: vec!["lat".into()],
+                        on_delete: Some(ReferentialAction::NoAction),
+                        on_update: Some(ReferentialAction::Restrict)
+                    },
+                    TableConstraint::ForeignKey {
+                        name: None,
+                        columns: vec!["lat".into()],
+                        foreign_table: ObjectName(vec!["othertable4".into()]),
+                        referred_columns: vec!["lat".into()],
+                        on_delete: Some(ReferentialAction::Cascade),
+                        on_update: Some(ReferentialAction::SetDefault)
+                    },
+                    TableConstraint::ForeignKey {
+                        name: None,
+                        columns: vec!["lng".into()],
+                        foreign_table: ObjectName(vec!["othertable4".into()]),
+                        referred_columns: vec!["longitude".into()],
+                        on_delete: None,
+                        on_update: Some(ReferentialAction::SetNull)
+                    },
+                ]
+            );
             assert_eq!(with_options, vec![]);
         }
         _ => unreachable!(),
@@ -1290,6 +1334,18 @@ fn parse_create_table() {
         .contains("Expected constraint details after CONSTRAINT <name>"));
 }
 
+#[test]
+fn parse_create_table_with_multiple_on_delete_in_constraint_fails() {
+    parse_sql_statements(
+        "\
+        create table X (\
+            y_id int, \
+            foreign key (y_id) references Y (id) on delete cascade on update cascade on delete no action\
+        )",
+    )
+        .expect_err("should have failed");
+}
+
 #[test]
 fn parse_create_table_with_multiple_on_delete_fails() {
     parse_sql_statements(