Error with Mysql insertion with JDBC

Question

I’m running this code:

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package br.com.caelum.jdbc;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class TestaInsercao {

    public static void main(String[] args) throws SQLException {

        Connection connection = DataBase.getConnection();
        String nome = "Notebook";
        String descricao = "Notebook core i5";
        String sql = "insert into produto (nome, descricao) values (?,?)";

        PreparedStatement comando = connection.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS);
        comando.setString(1, nome);
        comando.setString(2, descricao);

        boolean resultado = comando.execute();
        System.out.println(resultado);

        ResultSet resultSet = comando.getGeneratedKeys();
        while (resultSet.next()) {

            String id = resultSet.getString("id");
            System.out.println("Chave gerado: " + id);

        }

        resultSet.close();
        comando.close();
        connection.close();
    }
}

And I’m getting the following Sqlexception on the line comando.getString("id"):

run: false Exception in thread "main" java.sql.Sqlexception: Column 'id' not found. at com.mysql.jdbc.SQLError.createSQLException(Sqlerror.java:1074) at com.mysql.jdbc.SQLError.createSQLException(Sqlerror.java:988) at com.mysql.jdbc.SQLError.createSQLException(Sqlerror.java:974) at com.mysql.jdbc.SQLError.createSQLException(Sqlerror.java:919) at com.mysql.jdbc.ResultSetImpl.findColumn(Resultsetimpl.java:1167) at com.mysql.jdbc.ResultSetImpl.getString(Resultsetimpl.java:5733) at br.com.Caelum.jdbc.Testainsercao.main(Testainsercao.java:33) C: Users Bahia Appdata Local Netbeans Cache 8.2 executor-snippets run.xml:53: Java returned: 1 BUILD FAILURE (total time: 0 seconds)

I know that There you are saying that you are not finding the id column, but it exists, and when I go to Mysql Workbench and make a select in my table, it shows that the product has been added, even showing false and giving Exception in java

Answer 1

Your ID is a String even?

If it is auto increment, do a test with this code in the location of your Resultset and your While:

try (ResultSet resultSet = comando.getGeneratedKeys()) {
  if (resultSet.next()) {
    long id = resultSet.getLong(1);
    System.out.println("Chave gerado: " + id);
  }else {
    throw new SQLException("Creating user failed, no ID obtained.");
  }
}