fix README.md

Author: Nikolai Malygin

README.md

@@ -23,14 +23,12 @@
 
 2. Create a rdbms object
 ```java
-RDbms rdbms = new RealRDbms(/* your datasource */);
+Rdbms rdbms = new RealRdbms(dataSource);
 ```
 
 3. Use the rdbms object
 ```java
-List<String> titles = rdbms
-        .query("SELECT title FROM books")
-        .executeWith(new StringListHandler("title"));
+rdbms.change("INSERT INTO books(title) VALUES ('Clean Code')").apply();
 ```
 
 ## Use cases

src/test/java/com/nmalygin/superb/jdbc/real/ConnectionQueryTest.java

@@ -42,7 +42,7 @@
 
 class ConnectionQueryTest {
     @Test
-    void simpleInsert() throws SQLException {
+    void simpleSelect() throws SQLException {
         final DataSource dataSource = new H2DataSource();
         new LibraryDB(dataSource).init();
         final BooksTable booksTable = new DataSourceBooksTable(dataSource);

src/test/java/com/nmalygin/superb/jdbc/real/ReadmeTest.java

@@ -0,0 +1,50 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2024 Nikolai Malygin
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package com.nmalygin.superb.jdbc.real;
+
+import com.nmalygin.superb.jdbc.api.Rdbms;
+import com.nmalygin.superb.jdbc.real.testdb.BooksTable;
+import com.nmalygin.superb.jdbc.real.testdb.DataSourceBooksTable;
+import com.nmalygin.superb.jdbc.real.testdb.H2DataSource;
+import com.nmalygin.superb.jdbc.real.testdb.LibraryDB;
+import org.junit.jupiter.api.Test;
+
+import javax.sql.DataSource;
+import java.sql.SQLException;
+
+public class ReadmeTest {
+
+    @Test
+    void quickStart() throws SQLException {
+        final DataSource dataSource = new H2DataSource();
+        new LibraryDB(dataSource).init();
+        final BooksTable booksTable = new DataSourceBooksTable(dataSource);
+
+        Rdbms rdbms = new RealRdbms(dataSource);
+        rdbms.change("INSERT INTO books(title) VALUES ('Clean Code')").apply();
+
+        System.out.println(booksTable.books().get(0).title());
+    }
+}

src/test/java/com/nmalygin/superb/jdbc/real/testdb/LibraryDB.java

@@ -40,7 +40,7 @@ public LibraryDB(final DataSource dataSource) {
     public void init() throws SQLException {
         final String sql =
                 "CREATE TABLE books " +
-                "(id UUID," +
+                "(id UUID DEFAULT random_uuid()," +
                 "title VARCHAR NOT NULL, " +
                 "PRIMARY KEY (id)" +
                 ")";