Implement getURL() for JDBC4DatabaseMetaData

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

@@ -13,6 +13,7 @@ import org.github.tursodatabase.utils.LoggerFactory;
 public class LimboConnection {
   private static final Logger logger = LoggerFactory.getLogger(LimboConnection.class);
 
+  private final String url;
   private final long connectionPtr;
   private final AbstractDB database;
   private boolean closed;
@@ -28,6 +29,7 @@ public class LimboConnection {
    * @param filePath path to file
    */
   public LimboConnection(String url, String filePath, Properties properties) throws SQLException {
+    this.url = url;
     this.database = open(url, filePath, properties);
     this.connectionPtr = this.database.connect();
   }
@@ -41,6 +43,10 @@ public class LimboConnection {
     if (isClosed()) throw new SQLException("database connection closed");
   }
 
+  public String getUrl() {
+    return url;
+  }
+
   public void close() throws SQLException {
     if (isClosed()) {
       return;

bindings/java/src/main/java/org/github/tursodatabase/jdbc4/JDBC4Connection.java

@@ -368,4 +368,8 @@ public class JDBC4Connection implements Connection {
     // TODO: add support for busyTimeout
     return 0;
   }
+
+  public String getUrl() {
+    return this.connection.getUrl();
+  }
 }

bindings/java/src/main/java/org/github/tursodatabase/jdbc4/JDBC4DatabaseMetaData.java

@@ -28,7 +28,7 @@ public class JDBC4DatabaseMetaData implements DatabaseMetaData {
 
     @Override
     public String getURL() throws SQLException {
-        return "";
+        return connection.getUrl();
     }
 
     @Override
@@ -786,6 +786,7 @@ public class JDBC4DatabaseMetaData implements DatabaseMetaData {
     }
 
     @Override
+    @SkipNullableCheck
     public Connection getConnection() throws SQLException {
         return null;
     }

bindings/java/src/test/java/org/github/tursodatabase/jdbc4/JDBC4DatabaseMetaDataTest.java

@@ -0,0 +1,28 @@
+package org.github.tursodatabase.jdbc4;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import java.util.Properties;
+
+import org.github.tursodatabase.TestUtils;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+class JDBC4DatabaseMetaDataTest {
+
+    private JDBC4Connection connection;
+    private JDBC4DatabaseMetaData metaData;
+
+    @BeforeEach
+    void setUp() throws Exception {
+        String filePath = TestUtils.createTempFile();
+        String url = "jdbc:sqlite:" + filePath;
+        connection = new JDBC4Connection(url, filePath, new Properties());
+        metaData = new JDBC4DatabaseMetaData(connection);
+    }
+
+    @Test
+    void getURLShouldReturnNonEmptyString() throws Exception{
+        assertFalse(metaData.getURL().isEmpty());
+    }
+}