batchMode设置错误

// conn是已经创建的Connection对象，创建该connection的url参数包含batchMode=on&reWriteBatchedInserts=true
// 批量绑定参数后执行，绑定参数数量会与改写后的insert语句的栏位数不匹配，提示异常。
// java.sql.BatchUpdateException: bind message supplies 3 parameters, but prepared statement "" requires 6
PreparedStatement stmt = conn.prepareStatement("insert into test_tbl values (?, ?, ?)");

stmt.setInt(1, 1);
stmt.setString(2, "aaa");
stmt.setString(3, "bbbb");
stmt.addBatch();

stmt.setInt(1, 1);
stmt.setString(2, "aaa");
stmt.setString(3, "bbbb");
stmt.addBatch();

stmt.setInt(1, 1);
stmt.setString(2, "aaa");
stmt.setString(3, "bbbb");
stmt.addBatch();

stmt.executeBatch();