"INSERT INTO" Statements with INDENTITY Columns

This section describes what will happen if you try to insert rows with values for GENERATED ALWAYS AS IDENTITY columns.

An INDENTITY column is a special column in a table that is defined to have its values automatically added with a sequence number generator. An INDENTITY column is normally used for the primary key column in a table. For example, the ID column in the Profile table created in a previous tutorial is an INDENTITY column.

If an IDENTITY column is defined with "GENERATED ALWAYS AS IDENTITY" and you try to add values to this column in INSERT statements, you will get an error as shown in the sample program below:

/* DerbyInsertIdentity.java
 * Copyright (c) HerongYang.com. All Rights Reserved.
import java.sql.*;
public class DerbyInsertIdentity {
  public static void main(String [] args) {
    Connection con = null;
    try {
      con = DriverManager.getConnection("jdbc:derby://localhost/TestDB");
      Statement sta = con.createStatement();

// insert a single row
      int count = sta.executeUpdate(
        "INSERT INTO Profile"
        + " (ID, FirstName, LastName, ModTime)"
        + " VALUES (1001, 'Herong', 'Yang', '2017-04-01')");
      System.out.println("Number of rows inserted: "+count);

    } catch (Exception e) {
      System.err.println("Exception: "+e.getMessage());

Here is the error message from this program:

Exception: Attempt to modify an identity column 'ID'.

Table of Contents

 About This Book

 JDBC (Java Database Connectivity) Introduction

 JDK (Java SE) Installation

 Installing and Running Java DB - Derby

 Derby (Java DB) JDBC Driver

 Derby (Java DB) JDBC DataSource Objects

Java DB (Derby) - DML Statements

 Tables with Primary Key Column "GENERATED ... AS IDENTITY"

 "INSERT INTO" Statements

"INSERT INTO" Statements with INDENTITY Columns

 Handling Date and Timestamp Values

 "UPDATE" Statements

 "DELETE FROM" Statements

 Java DB (Derby) - ResultSet Objects of Queries

 Java DB (Derby) - PreparedStatement

 MySQL Installation on Windows

 MySQL JDBC Driver (MySQL Connector/J)

 MySQL - PreparedStatement

 MySQL - Reference Implementation of JdbcRowSet

 MySQL - JBDC CallableStatement

 MySQL CLOB (Character Large Object) - TEXT

 MySQL BLOB (Binary Large Object) - BLOB

 Oracle Express Edition Installation on Windows

 Oracle JDBC Drivers

 Oracle - Reference Implementation of JdbcRowSet

 Oracle - PreparedStatement

 Oracle - JBDC CallableStatement

 Oracle CLOB (Character Large Object) - TEXT

 Oracle BLOB (Binary Large Object) - BLOB

 Microsoft SQL Server Express Edition

 Microsoft JDBC Driver for SQL Server

 Microsoft JDBC Driver - Query Statements and Result Sets

 Microsoft JDBC Driver - DatabaseMetaData Object

 Microsoft JDBC Driver - DDL Statements

 Microsoft JDBC Driver - DML Statements

 SQL Server - PreparedStatement

 SQL Server CLOB (Character Large Object) - TEXT

 SQL Server BLOB (Binary Large Object) - BLOB

 JDBC-ODBC Bridge Driver - sun.jdbc.odbc.JdbcOdbcDriver

 JDBC-ODBC Bridge Driver - Flat Text Files

 JDBC-ODBC Bridge Driver - MS Access

 JDBC-ODBC Bridge Driver - MS SQL Server

 Summary of JDBC Drivers and Database Servers

 Using Connection Pool with JDBC

 Archived Tutorials


 Full Version in PDF/EPUB