Implement close() on LimboStatement

bindings/java/rs_src/limbo_statement.rs

@@ -88,6 +88,15 @@ pub extern "system" fn Java_org_github_tursodatabase_core_LimboStatement_step<'l
     }
 }
 
+#[no_mangle]
+pub extern "system" fn Java_org_github_tursodatabase_core_LimboStatement__1close<'local>(
+    _env: JNIEnv<'local>,
+    _obj: JObject<'local>,
+    stmt_ptr: jlong
+) {
+    LimboStatement::drop(stmt_ptr);
+}
+
 fn row_to_obj_array<'local>(
     env: &mut JNIEnv<'local>,
     row: &limbo_core::Row,

bindings/java/src/main/java/org/github/tursodatabase/core/LimboResultSet.java

@@ -50,7 +50,11 @@ public class LimboResultSet {
    * cursor can only move forward.
    */
   public boolean next() throws SQLException {
-    if (!open || isEmptyResultSet || pastLastRow) {
+    if (!open) {
+      throw new SQLException("The resultSet is not open");
+    }
+
+    if (isEmptyResultSet || pastLastRow) {
       return false; // completed ResultSet
     }
 
@@ -97,6 +101,11 @@ public class LimboResultSet {
     }
   }
 
+  public void close() throws SQLException {
+    this.statement.close();
+    this.open = false;
+  }
+
   @Override
   public String toString() {
     return "LimboResultSet{"

bindings/java/src/main/java/org/github/tursodatabase/core/LimboStatement.java

@@ -67,6 +67,16 @@ public class LimboStatement {
     LimboExceptionUtils.throwLimboException(errorCode, errorMessageBytes);
   }
 
+  /**
+   * Closes the current statement and releases any resources associated with it. This method calls
+   * the native `_close` method to perform the actual closing operation.
+   */
+  public void close() {
+    _close(statementPointer);
+  }
+
+  private native void _close(long statementPointer);
+
   @Override
   public String toString() {
     return "LimboStatement{"

bindings/java/src/main/java/org/github/tursodatabase/jdbc4/JDBC4ResultSet.java

@@ -25,7 +25,7 @@ public class JDBC4ResultSet implements ResultSet {
 
   @Override
   public void close() throws SQLException {
-    // TODO
+    resultSet.close();
   }
 
   @Override
@@ -866,8 +866,7 @@ public class JDBC4ResultSet implements ResultSet {
 
   @Override
   public boolean isClosed() throws SQLException {
-    // TODO
-    return false;
+    return !resultSet.isOpen();
   }
 
   @Override

bindings/java/src/test/java/org/github/tursodatabase/jdbc4/JDBC4ResultSetTest.java

@@ -57,4 +57,28 @@ class JDBC4ResultSetTest {
     // as well
     assertFalse(resultSet.next());
   }
+
+  @Test
+  void resultSet_close_test() throws Exception {
+    stmt.executeUpdate("CREATE TABLE users (id INT PRIMARY KEY, username TEXT);");
+    stmt.executeUpdate("INSERT INTO users VALUES (2, 'seonwoo');");
+    stmt.executeQuery("SELECT * FROM users");
+    ResultSet resultSet = stmt.getResultSet();
+
+    assertFalse(resultSet.isClosed());
+    resultSet.close();
+    assertTrue(resultSet.isClosed());
+  }
+
+  @Test
+  void calling_methods_on_closed_resultSet_should_throw_exception() throws Exception {
+    stmt.executeUpdate("CREATE TABLE users (id INT PRIMARY KEY, username TEXT);");
+    stmt.executeUpdate("INSERT INTO users VALUES (2, 'seonwoo');");
+    stmt.executeQuery("SELECT * FROM users");
+    ResultSet resultSet = stmt.getResultSet();
+    resultSet.close();
+    assertTrue(resultSet.isClosed());
+
+    resultSet.next();
+  }
 }