Update Basic.java

Author: Paultagoras

examples/jdbc/src/main/java/com/clickhouse/examples/jdbc/Basic.java

@@ -8,6 +8,7 @@
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.sql.Statement;
+import java.util.Collections;
 import java.util.Properties;
 
 public class Basic {
@@ -24,25 +25,28 @@ public static void main(String[] args) {
         try (Connection conn = DriverManager.getConnection(url, properties)) {//Grab a connection using the jdbc DriverManager
             try (Statement stmt = conn.createStatement()) {//Create a statement
                 stmt.execute("DROP TABLE IF EXISTS " + TABLE_NAME);//Execute a query to drop the table if it exists
-                stmt.execute("CREATE TABLE " + TABLE_NAME + " (date Date, id UInt32, name String) ENGINE = Memory");
+                stmt.execute("CREATE TABLE " + TABLE_NAME + " (`date` Date, `id` UInt32, `name` String, `attributes` Map(String, String)) " +
+                        "ENGINE = MergeTree() ORDER BY id");//Create a table with three columns: date, id, and name
 
-                try (PreparedStatement pstmt = conn.prepareStatement("INSERT INTO " + TABLE_NAME + " VALUES(?, ?, ?)")) {//Create a prepared statement
-                    pstmt.setDate(1, new Date(System.currentTimeMillis()));//Set the first parameter to the current date (using java.sql.Date)
+                try (PreparedStatement pstmt = conn.prepareStatement("INSERT INTO " + TABLE_NAME + " VALUES(?, ?, ?, ?)")) {//Create a prepared statement
+                    pstmt.setDate(1, Date.valueOf("2025-01-01"));//Set the first parameter to '2025-01-01' (using java.sql.Date)
                     pstmt.setInt(2, 1);//Set the second parameter to 1
                     pstmt.setString(3, "Alice");//Set the third parameter to "Alice"
+                    pstmt.setObject(4, Collections.singletonMap("key1", "value1"));
                     pstmt.addBatch();//Add the current parameters to the batch
 
-                    pstmt.setDate(1, new Date(System.currentTimeMillis()));//Set the first parameter to the current date (using java.sql.Date)
+                    pstmt.setDate(1, Date.valueOf("2025-02-01"));//Set the first parameter to '2025-02-01'
                     pstmt.setInt(2, 2);//Set the second parameter to 2
                     pstmt.setString(3, "Bob");//Set the third parameter to "Bob"
+                    pstmt.setObject(4, Collections.singletonMap("key2", "value2"));
                     pstmt.addBatch();//Add the current parameters to the batch
 
                     pstmt.executeBatch();//Execute the batch
                 }
 
                 try (ResultSet rs = stmt.executeQuery("SELECT * FROM " + TABLE_NAME)) {
                     while (rs.next()) {
-                        System.out.println(rs.getDate(1) + ", " + rs.getInt(2) + ", " + rs.getString(3));
+                        System.out.println(rs.getDate(1) + ", " + rs.getInt(2) + ", " + rs.getString(3) + ", " + rs.getObject(4));
                     }
                 }
             }