Introduce batch support.

src/integrationTest/java/com/mongodb/hibernate/query/AbstractQueryIntegrationTests.java

@@ -127,7 +127,7 @@ protected <T> void assertSelectionQuery(
             }
             var resultList = selectionQuery.getResultList();
 
-            assertActualCommand(BsonDocument.parse(expectedMql));
+            assertActualCommandsInOrder(BsonDocument.parse(expectedMql));
 
             resultListVerifier.accept(resultList);
 
@@ -177,13 +177,13 @@ protected void assertSelectQueryFailure(
                 expectedExceptionMessageParameters);
     }
 
-    protected void assertActualCommand(BsonDocument expectedCommand) {
+    protected void assertActualCommandsInOrder(BsonDocument... expectedCommands) {
         var capturedCommands = testCommandListener.getStartedCommands();
-
-        assertThat(capturedCommands)
-                .singleElement()
-                .asInstanceOf(InstanceOfAssertFactories.MAP)
-                .containsAllEntriesOf(expectedCommand);
+        assertThat(capturedCommands).hasSize(expectedCommands.length);
+        for (int i = 0; i < expectedCommands.length; i++) {
+            BsonDocument actual = capturedCommands.get(i);
+            assertThat(actual).asInstanceOf(InstanceOfAssertFactories.MAP).containsAllEntriesOf(expectedCommands[i]);
+        }
     }
 
     protected void assertMutationQuery(
@@ -217,7 +217,7 @@ protected void assertMutationQuery(
                 queryPostProcessor.accept(query);
             }
             var mutationCount = query.executeUpdate();
-            assertActualCommand(BsonDocument.parse(expectedMql));
+            assertActualCommandsInOrder(BsonDocument.parse(expectedMql));
             assertThat(mutationCount).isEqualTo(expectedMutationCount);
         });
         assertThat(collection.find()).containsExactlyElementsOf(expectedDocuments);

src/integrationTest/java/com/mongodb/hibernate/query/mutation/BatchUpdateIntegrationTests.java

@@ -0,0 +1,200 @@
+/*
+ * Copyright 2025-present MongoDB, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.mongodb.hibernate.query.mutation;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.bson.RawBsonDocument.parse;
+
+import com.mongodb.client.MongoCollection;
+import com.mongodb.hibernate.junit.InjectMongoCollection;
+import com.mongodb.hibernate.query.AbstractQueryIntegrationTests;
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+import jakarta.persistence.Table;
+import java.util.List;
+import org.bson.BsonDocument;
+import org.hibernate.cfg.AvailableSettings;
+import org.hibernate.engine.spi.SessionImplementor;
+import org.hibernate.testing.orm.junit.DomainModel;
+import org.hibernate.testing.orm.junit.ServiceRegistry;
+import org.hibernate.testing.orm.junit.Setting;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+@DomainModel(annotatedClasses = BatchUpdateIntegrationTests.Item.class)
+@ServiceRegistry(settings = @Setting(name = AvailableSettings.STATEMENT_BATCH_SIZE, value = "3"))
+class BatchUpdateIntegrationTests extends AbstractQueryIntegrationTests {
+
+    private static final String COLLECTION_NAME = "items";
+    private static final int ENTITIES_TO_PERSIST_COUNT = 5;
+
+    @InjectMongoCollection(COLLECTION_NAME)
+    private static MongoCollection<BsonDocument> collection;
+
+    @BeforeEach
+    void beforeEach() {
+        getTestCommandListener().clear();
+    }
+
+    @Test
+    void testBatchInsert() {
+        getSessionFactoryScope().inTransaction(session -> {
+            for (int i = 1; i <= ENTITIES_TO_PERSIST_COUNT; i++) {
+                session.persist(new Item(i, String.valueOf(i)));
+            }
+            session.flush();
+            assertActualCommandsInOrder(
+                    parse(
+                            """
+                             {
+                                 "insert": "items",
+                                 "ordered": true,
+                                 "documents": [
+                                   { "_id": 1, "string": "1"},
+                                   { "_id": 2, "string": "2"},
+                                   { "_id": 3, "string": "3"}
+                                 ]
+                             }
+                            """),
+                    parse(
+                            """
+                             {
+                                 "insert": "items",
+                                 "ordered": true,
+                                 "documents": [
+                                    { "_id": 4, "string": "4"},
+                                    { "_id": 5, "string": "5"}
+                                 ]
+                             }
+                            """));
+        });
+
+        assertThat(collection.find())
+                .containsExactlyElementsOf(List.of(
+                        BsonDocument.parse("{ _id: 1, string: '1' }"),
+                        BsonDocument.parse("{ _id: 2, string: '2' }"),
+                        BsonDocument.parse("{ _id: 3, string: '3' }"),
+                        BsonDocument.parse("{ _id: 4, string: '4' }"),
+                        BsonDocument.parse("{ _id: 5, string: '5' }")));
+    }
+
+    @Test
+    void testBatchUpdate() {
+        getSessionFactoryScope().inTransaction(session -> {
+            insertTestData(session);
+            for (int i = 1; i <= ENTITIES_TO_PERSIST_COUNT; i++) {
+                Item item = session.find(Item.class, i);
+                item.string = "u" + i;
+            }
+            session.flush();
+            assertActualCommandsInOrder(
+                    parse(
+                            """
+                            {
+                              "update": "items",
+                              "ordered": true,
+                              "updates": [
+                                { "q": { "_id": { "$eq": 1 } }, "u": { "$set": { "string": "u1" } }, "multi": true },
+                                { "q": { "_id": { "$eq": 2 } }, "u": { "$set": { "string": "u2" } }, "multi": true },
+                                { "q": { "_id": { "$eq": 3 } }, "u": { "$set": { "string": "u3" } }, "multi": true }
+                              ]
+                            }
+                            """),
+                    parse(
+                            """
+                            {
+                              "update": "items",
+                              "ordered": true,
+                              "updates": [
+                                { "q": { "_id": { "$eq": 4 } }, "u": { "$set": { "string": "u4" } }, "multi": true },
+                                { "q": { "_id": { "$eq": 5 } }, "u": { "$set": { "string": "u5" } }, "multi": true }
+                              ]
+                            }
+                            """));
+        });
+
+        assertThat(collection.find())
+                .containsExactlyElementsOf(java.util.List.of(
+                        BsonDocument.parse("{ _id: 1, string: 'u1' }"),
+                        BsonDocument.parse("{ _id: 2, string: 'u2' }"),
+                        BsonDocument.parse("{ _id: 3, string: 'u3' }"),
+                        BsonDocument.parse("{ _id: 4, string: 'u4' }"),
+                        BsonDocument.parse("{ _id: 5, string: 'u5' }")));
+    }
+
+    @Test
+    void testBatchDelete() {
+        getSessionFactoryScope().inTransaction(session -> {
+            insertTestData(session);
+            for (int i = 1; i <= ENTITIES_TO_PERSIST_COUNT; i++) {
+                var item = session.find(Item.class, i);
+                session.remove(item);
+            }
+            session.flush();
+            assertActualCommandsInOrder(
+                    parse(
+                            """
+                            {
+                                "delete": "items",
+                                "ordered": true,
+                                "deletes": [
+                                    {"q": {"_id": {"$eq": 1}}, "limit": 0},
+                                    {"q": {"_id": {"$eq": 2}}, "limit": 0},
+                                    {"q": {"_id": {"$eq": 3}}, "limit": 0}
+                                ]
+                            }
+                            """),
+                    parse(
+                            """
+                            {
+                                "delete": "items",
+                                "ordered": true,
+                                "deletes": [
+                                    {"q": {"_id": {"$eq": 4}}, "limit": 0},
+                                    {"q": {"_id": {"$eq": 5}}, "limit": 0}
+                                ]
+                            }
+                            """));
+        });
+
+        assertThat(collection.find()).isEmpty();
+    }
+
+    private void insertTestData(final SessionImplementor session) {
+        for (int i = 1; i <= 5; i++) {
+            session.persist(new Item(i, String.valueOf(i)));
+        }
+        session.flush();
+        getTestCommandListener().clear();
+    }
+
+    @Entity
+    @Table(name = COLLECTION_NAME)
+    static class Item {
+        @Id
+        int id;
+
+        String string;
+
+        Item() {}
+
+        Item(int id, String string) {
+            this.id = id;
+            this.string = string;
+        }
+    }
+}

src/integrationTest/java/com/mongodb/hibernate/query/select/LimitOffsetFetchClauseIntegrationTests.java

@@ -613,7 +613,7 @@ private void setQueryOptionsAndQuery(
             query.getResultList();
             if (expectedMql != null) {
                 var expectedCommand = BsonDocument.parse(expectedMql);
-                assertActualCommand(expectedCommand);
+                assertActualCommandsInOrder(expectedCommand);
             }
         }
     }

src/main/java/com/mongodb/hibernate/jdbc/MongoPreparedStatement.java

@@ -28,6 +28,7 @@
 import com.mongodb.hibernate.internal.type.ObjectIdJdbcType;
 import java.math.BigDecimal;
 import java.sql.Array;
+import java.sql.BatchUpdateException;
 import java.sql.JDBCType;
 import java.sql.PreparedStatement;
 import java.sql.ResultSet;
@@ -45,18 +46,22 @@
 import org.bson.BsonType;
 import org.bson.BsonValue;
 import org.bson.types.ObjectId;
+import org.jspecify.annotations.Nullable;
 
 final class MongoPreparedStatement extends MongoStatement implements PreparedStatementAdapter {
 
     private final BsonDocument command;
-
+    private final List<BsonDocument> commandBatch;
     private final List<ParameterValueSetter> parameterValueSetters;
 
+    private static final int @Nullable [] NULL_UPDATE_COUNTS = null;
+
     MongoPreparedStatement(
             MongoDatabase mongoDatabase, ClientSession clientSession, MongoConnection mongoConnection, String mql)
             throws SQLSyntaxErrorException {
         super(mongoDatabase, clientSession, mongoConnection);
         this.command = MongoStatement.parse(mql);
+        this.commandBatch = new ArrayList<>();
         this.parameterValueSetters = new ArrayList<>();
         parseParameters(command, parameterValueSetters);
     }
@@ -66,15 +71,16 @@ public ResultSet executeQuery() throws SQLException {
         checkClosed();
         closeLastOpenResultSet();
         checkAllParametersSet();
-        return executeQueryCommand(command);
+        return executeQuery(command);
     }
 
     @Override
     public int executeUpdate() throws SQLException {
         checkClosed();
         closeLastOpenResultSet();
         checkAllParametersSet();
-        return executeUpdateCommand(command);
+        checkSupportedUpdateCommand(command);
+        return executeUpdate(command);
     }
 
     private void checkAllParametersSet() throws SQLException {
@@ -179,7 +185,47 @@ public void setObject(int parameterIndex, Object x, int targetSqlType) throws SQ
     @Override
     public void addBatch() throws SQLException {
         checkClosed();
-        throw new SQLFeatureNotSupportedException("TODO-HIBERNATE-35 https://jira.mongodb.org/browse/HIBERNATE-35");
+        checkAllParametersSet();
+        commandBatch.add(command.clone());
+    }
+
+    @Override
+    public void clearBatch() throws SQLException {
+        checkClosed();
+        commandBatch.clear();
+    }
+
+    @Override
+    public int[] executeBatch() throws SQLException {
+        checkClosed();
+        try {
+            closeLastOpenResultSet();
+            if (commandBatch.isEmpty()) {
+                return EMPTY_BATCH_RESULT;
+            }
+            checkSupportedBatchCommand(commandBatch.get(0));
+            return executeBatch(commandBatch);
+        } finally {
+            commandBatch.clear();
+        }
+    }
+
+    /** @throws BatchUpdateException if any of the commands in the batch attempts to return a result set. */
+    private void checkSupportedBatchCommand(BsonDocument command)
+            throws SQLFeatureNotSupportedException, BatchUpdateException, SQLSyntaxErrorException {
+        var commandDescription = getCommandDescription(command);
+        if (commandDescription.returnsResultSet()) {
+            throw new BatchUpdateException(
+                    "Commands returning result set are not allowed. Received command: %s"
+                            .formatted(commandDescription.getCommandName()),
+                    NULL_SQL_STATE,
+                    NO_ERROR_CODE,
+                    NULL_UPDATE_COUNTS);
+        }
+        if (!commandDescription.isUpdate()) {
+            throw new SQLFeatureNotSupportedException(
+                    "Unsupported command for batch operation: %s".formatted(commandDescription.getCommandName()));
+        }
     }
 
     @Override