Update JDBC4Statement.java execute method to return result correctly

bindings/java/src/test/java/org/github/tursodatabase/jdbc4/JDBC4StatementTest.java

@@ -0,0 +1,53 @@
+package org.github.tursodatabase.jdbc4;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import java.sql.ResultSet;
+import java.sql.Statement;
+import java.util.Properties;
+
+import org.github.tursodatabase.TestUtils;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Test;
+
+class JDBC4StatementTest {
+
+    private Statement stmt;
+
+    @BeforeEach
+    void setUp() throws Exception {
+        String filePath = TestUtils.createTempFile();
+        String url = "jdbc:sqlite:" + filePath;
+        final JDBC4Connection connection = new JDBC4Connection(url, filePath, new Properties());
+        stmt = connection.createStatement(ResultSet.TYPE_FORWARD_ONLY,
+                                          ResultSet.CONCUR_READ_ONLY,
+                                          ResultSet.CLOSE_CURSORS_AT_COMMIT);
+    }
+
+    @Test
+    void execute_ddl_should_return_false() throws Exception{
+        assertFalse(stmt.execute("CREATE TABLE users (id INT PRIMARY KEY, username TEXT);"));
+    }
+
+    @Test
+    void execute_insert_should_return_false() throws Exception {
+        stmt.execute("CREATE TABLE users (id INT PRIMARY KEY, username TEXT);");
+        assertFalse(stmt.execute("INSERT INTO users VALUES (1, 'limbo');"));
+    }
+
+    @Test
+    @Disabled("UPDATE not supported yet")
+    void execute_update_should_return_false() throws Exception {
+        stmt.execute("CREATE TABLE users (id INT PRIMARY KEY, username TEXT);");
+        stmt.execute("INSERT INTO users VALUES (1, 'limbo');");
+        assertFalse(stmt.execute("UPDATE users SET username = 'seonwoo' WHERE id = 1;"));
+    }
+
+    @Test
+    void execute_select_should_return_true() throws Exception {
+        stmt.execute("CREATE TABLE users (id INT PRIMARY KEY, username TEXT);");
+        stmt.execute("INSERT INTO users VALUES (1, 'limbo');");
+        assertTrue(stmt.execute("SELECT * FROM users;"));
+    }
+}