The ResultSetMetaData.isAutoIncrement() method can tell us if a column value is automatically numbered or not. This method return true when the column is an auto-increment column, otherwise it return false. See the example below where we check if the first column (id) is an auto-increment column.
package org.kodejava.example.jdbc;
import java.sql.*;
public class IsAutoIncrementExample {
private static final String URL = "jdbc:mysql://localhost/kodejava";
private static final String USERNAME = "root";
private static final String PASSWORD = "";
public static void main(String[] args) {
try (Connection connection =
DriverManager.getConnection(URL, USERNAME, PASSWORD)) {
Statement statement = connection.createStatement();
ResultSet resultSet = statement.executeQuery(
"SELECT id, username, order_date FROM orders");
// The ResultSetMetaData is where all metadata related
// information for a result set is stored.
ResultSetMetaData metadata = resultSet.getMetaData();
if (metadata.isAutoIncrement(1)) {
System.out.println("Column `id` is an auto-increment column.");
}
} catch (SQLException e) {
e.printStackTrace();
}
}
}
Maven dependencies
<!-- https://search.maven.org/remotecontent?filepath=mysql/mysql-connector-java/8.0.17/mysql-connector-java-8.0.17.jar -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.17</version>
</dependency>
Founder at Kode Java Org
I am a programmer, a runner, a recreational diver, currently live in the island of Bali, Indonesia. Mostly programming in Java, Spring Framework, Hibernate / JPA. If these posts help, you can support me, buy me a cup of coffee or tea. Thank you đŸ¥³
Latest posts by Wayan Saryada (see all)
- How do I convert java.util.TimeZone to java.time.ZoneId? - April 25, 2020
- How do I get a list of all TimeZones Ids using Java 8? - April 25, 2020
- How do I get HTTP headers using HttpClient HEAD request? - April 22, 2020