Solves issue-2548

Author: potoo0

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

@@ -59,13 +59,20 @@ static void insertDateWithPreparedStatement(String url, Properties properties) t
                 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.executeBatch();//Execute the batch
 
                 pstmt.setObject(1, ZonedDateTime.now());
                 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.setObject(1, ZonedDateTime.now());
+                pstmt.setInt(2, 2);//Set the second parameter to 2
+                pstmt.setString(3, "Chris");//Set the third parameter to "Chris"
+                pstmt.setObject(4, Collections.singletonMap("key3", "value3"));
+                pstmt.addBatch();//Add the current parameters to the batch
+
                 pstmt.executeBatch();//Execute the batch
             }
         }

jdbc-v2/src/main/java/com/clickhouse/jdbc/PreparedStatementImpl.java

@@ -332,15 +332,23 @@ public long[] executeLargeBatch() throws SQLException {
     }
 
     private List<Integer> executeBatchImpl() throws SQLException {
+        List<Integer> results;
         if (insertStmtWithValues) {
-            return executeInsertBatch();
+            results = executeInsertBatch();
         } else {
-            List<Integer> results = new ArrayList<>();
+            results = new ArrayList<>();
             for (String sql : batch) {
                 results.add((int) executeUpdateImpl(sql, localSettings));
             }
-            return results;
         }
+        clearBatch();
+        return results;
+    }
+
+    @Override
+    public void clearBatch() throws SQLException {
+        super.clearBatch(); /// clear super#batch
+        batchValues.clear();
     }
 
     private List<Integer> executeInsertBatch() throws SQLException {

jdbc-v2/src/main/java/com/clickhouse/jdbc/StatementImpl.java

@@ -416,6 +416,7 @@ private List<Integer> executeBatchImpl() throws SQLException {
         for (String sql : batch) {
             results.add(executeUpdate(sql));
         }
+        clearBatch();
         return results;
     }