Add implicit sqlite rowid columns to print-schema output

diesel_cli/src/infer_schema_internals/sqlite.rs

@@ -114,6 +114,13 @@ fn get_sqlite_version(conn: &mut SqliteConnection) -> QueryResult<SqliteVersion>
     Ok(SqliteVersion::new(parts[0], parts[1], parts[2]))
 }
 
+// In sqlite the rowid is a signed 64-bit integer.
+// See: https://sqlite.org/rowidtable.html
+// We should use BigInt here but to avoid type problems with foreign keys to
+// rowid columns this is for now not done. A patch can be used after the schema
+// is generated to convert the columns to BigInt as needed.
+const ROWID_TYPE_NAME: &str = "Integer";
+
 pub fn get_table_data(
     conn: &mut SqliteConnection,
     table: &TableName,
@@ -134,6 +141,27 @@ pub fn get_table_data(
     // See: https://github.com/diesel-rs/diesel/issues/3579 as to why we use a direct
     // `sql_query` with `QueryableByName` instead of using `sql::<pragma_table_info::SqlType>`.
     let mut result = sql_query(query).load::<ColumnInformation>(conn)?;
+    // Add implicit rowid primary key column if the only primary key is rowid
+    // and ensure that the rowid column uses the right type.
+    let primary_key = get_primary_keys(conn, table)?;
+    if primary_key.len() == 1 {
+        let primary_key = primary_key.first().expect("guaranteed to have one element");
+        if !result.iter_mut().any(|x| &x.column_name == primary_key) {
+            // Prepend implicit rowid column for the rowid implicit primary key.
+            result.insert(
+                0,
+                ColumnInformation {
+                    column_name: String::from(primary_key),
+                    type_name: String::from(ROWID_TYPE_NAME),
+                    type_schema: None,
+                    nullable: false,
+                    max_length: None,
+                    comment: None,
+                },
+            );
+        }
+    }
+
     match column_sorting {
         ColumnSorting::OrdinalPosition => {}
         ColumnSorting::Name => {

diesel_cli/tests/print_schema.rs

@@ -268,6 +268,12 @@ fn print_schema_sqlite_implicit_foreign_key_reference() {
     test_print_schema("print_schema_sqlite_implicit_foreign_key_reference", vec![]);
 }
 
+#[test]
+#[cfg(feature = "sqlite")]
+fn print_schema_sqlite_without_explicit_primary_key() {
+    test_print_schema("print_schema_sqlite_without_explicit_primary_key", vec![])
+}
+
 #[test]
 #[cfg(feature = "postgres")]
 fn print_schema_respects_type_name_case() {

diesel_cli/tests/print_schema/print_schema_sqlite_without_explicit_primary_key/sqlite/expected.snap

@@ -7,23 +7,85 @@ description: "Test: print_schema_sqlite_without_explicit_primary_key"
 diesel::table! {
     no_explicit (rowid) {
         rowid -> Integer,
-        name -> Text,
+        name -> Nullable<Text>,
+    }
+}
+
+diesel::table! {
+    with_explicit_aliased_rowid (id) {
+        id -> Nullable<Integer>,
+        name -> Nullable<Text>,
+    }
+}
+
+diesel::table! {
+    with_explicit_aliased_rowid_not_null (id) {
+        id -> Integer,
+        name -> Nullable<Text>,
+    }
+}
+
+diesel::table! {
+    with_explicit_pk_rowid (rowid) {
+        rowid -> Nullable<Integer>,
+        name -> Nullable<Text>,
+    }
+}
+
+diesel::table! {
+    with_explicit_pk_rowid_autoincrement (rowid) {
+        rowid -> Nullable<Integer>,
+        name -> Nullable<Text>,
+    }
+}
+
+diesel::table! {
+    with_explicit_pk_rowid_autoincrement_not_null (rowid) {
+        rowid -> Integer,
+        name -> Nullable<Text>,
+    }
+}
+
+diesel::table! {
+    with_explicit_pk_rowid_not_null (rowid) {
+        rowid -> Integer,
+        name -> Nullable<Text>,
     }
 }
 
 diesel::table! {
     with_explicit_rowid (oid) {
         oid -> Integer,
-        name -> Text,
-        rowid -> Text,
+        name -> Nullable<Text>,
+        rowid -> Nullable<Text>,
     }
 }
 
 diesel::table! {
     with_explicit_rowid_oid (_rowid_) {
         _rowid_ -> Integer,
-        name -> Text,
-        rowid -> Text,
-        oid -> Text,
+        name -> Nullable<Text>,
+        rowid -> Nullable<Text>,
+        oid -> Nullable<Text>,
     }
 }
+
+diesel::table! {
+    without_rowid (word) {
+        word -> Text,
+        cnt -> Nullable<Integer>,
+    }
+}
+
+diesel::allow_tables_to_appear_in_same_query!(
+    no_explicit,
+    with_explicit_aliased_rowid,
+    with_explicit_aliased_rowid_not_null,
+    with_explicit_pk_rowid,
+    with_explicit_pk_rowid_autoincrement,
+    with_explicit_pk_rowid_autoincrement_not_null,
+    with_explicit_pk_rowid_not_null,
+    with_explicit_rowid,
+    with_explicit_rowid_oid,
+    without_rowid,
+);

diesel_cli/tests/print_schema/print_schema_sqlite_without_explicit_primary_key/sqlite/schema.sql

@@ -12,3 +12,38 @@ CREATE TABLE with_explicit_rowid_oid (
     rowid TEXT,
     oid TEXT
 );
+
+CREATE TABLE with_explicit_pk_rowid (
+    rowid INTEGER PRIMARY KEY,
+    name TEXT
+);
+
+CREATE TABLE with_explicit_pk_rowid_autoincrement (
+    rowid INTEGER PRIMARY KEY AUTOINCREMENT,
+    name TEXT
+);
+
+CREATE TABLE with_explicit_pk_rowid_not_null (
+    rowid INTEGER PRIMARY KEY NOT NULL,
+    name TEXT
+);
+
+CREATE TABLE with_explicit_pk_rowid_autoincrement_not_null (
+    rowid INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
+    name TEXT
+);
+
+CREATE TABLE with_explicit_aliased_rowid (
+    id INTEGER PRIMARY KEY,
+    name TEXT
+);
+
+CREATE TABLE with_explicit_aliased_rowid_not_null (
+    id INTEGER PRIMARY KEY NOT NULL,
+    name TEXT
+);
+
+CREATE TABLE without_rowid (
+    word TEXT PRIMARY KEY,
+    cnt INTEGER
+) WITHOUT ROWID;