了解自增字段的值

Question

使用代码在表中插入记录，其中一个字段是自动递增的 (id)。如何找出我刚刚插入的记录中的自动增量字段 (id) 的值是多少？

         PreparedStatement ps = null;
    Connection con = null;
    ResultSet rs = null;
    int rows = 0;
    try {
        String SQL_DRV = "org.hsqldb.jdbcDriver";
        String SQL_URL = "jdbc:hsqldb:hsql://localhost/localDB";

                    Class.forName(SQL_DRV);
        con = DriverManager.getConnection(SQL_URL, "sa", "");

                                ps = con.prepareStatement(
                "insert into infousuarios (nombre, apellidos, email) " +
                "values (?, ?, ?)");
        ps.setString(1, name);
        ps.setString(2, surnames);
        ps.setString(3, login+"@micorreo.com");


        rows = ps.executeUpdate();
        // How I can know the value of autoincrement field (id) of the record just enter??

Answer 1

使用getGeneratedKeys()：

ps = con.prepareStatement(
      "insert into infousuarios (nombre, apellidos, email) " +
      "values (?, ?, ?)", Statement.RETURN_GENERATED_KEYS); 

ps.setString(1, name);
ps.setString(2, surnames);
ps.setString(3, login+"@micorreo.com");

rows = ps.executeUpdate();

ResultSet keys = ps.getGeneratedKeys();
long id = -1;

if (keys.next()) {
  id = rs.getLong(1);
}

注意对prepareStatement 的调用传递PreparedStatement.RETURN_GENERATED_KEYS 和对ps.getGeneratedKeys() 的调用

Answer 2

insert_id 可以检索最后插入的 id $id=$mysqli->insert_id;