日期:2014-05-16 浏览次数:20472 次
public static void main(String[] args) { // TODO Auto-generated method stub String driver = "com.mysql.jdbc.Driver"; String url = "jdbc:mysql://localhost:3306/brew_operation_db?characterEncoding=UTF-8"; String userName = "root"; String password = "123"; ArrayList<String> Imagepath = new ArrayList<String>(); ArrayList<String> name = new ArrayList<String>(); ArrayList<Integer> id = new ArrayList<Integer>(); ArrayList<Integer> ids = new ArrayList<Integer>(); try { Class.forName(driver); Connection conn = DriverManager.getConnection(url, userName, password); Statement statement = conn.createStatement(); String sql = "select * from brew group by name having count(*)>1"; ResultSet rs = statement.executeQuery(sql); while(rs.next()){ name.add(rs.getString("name")); id.add(rs.getInt("id")); Imagepath.add(rs.getString("Imagepath")) ; } rs.close(); statement.close(); for (int j = 0; j < id.size(); j++) { String sqla = "select * from brew where name = '"+name.get(j)+"' and id <> "+id.get(j); Statement statement1 = conn.createStatement(); ResultSet rs1 = statement1.executeQuery(sqla); if(rs1.next()){ ids.add(rs1.getInt("id")); } } for (int i = 0; i < ids.size(); i++) { String sqlb = "update brew set Imagepath = '"+Imagepath.get(i)+"' where id = "+ids.get(i); Statement statement2 = conn.createStatement(); int s = statement2.executeUpdate(sqlb); } } catch (Exception e) { // TODO: handle exception e.printStackTrace(); } }