Java jdbc获取生成的键的列名

Question

I've inserted a record with a composite primary key in table via jdbc and got generated values of primary key.

pm = connection.prepareStatement(strQuery,Statement.RETURN_GENERATED_KEYS);
pm.executeUpdate();
ResultSet rsInsert = pm.getGeneratedKeys();
if(rsInsert != null && rsInsert.next()){
    int count = rsInsert.getMetaData().getColumnCount();
    Map<String,Object> map = new HashMap<>();
    for(int i = 1;i <=count;i++)
    {
        Object value = rsInsert.getObject(i);
    }
}

How can I get the column names of generated values? Thanks

Answer 1

If you had examined the ResultSetMetaData you're getting with rsInsert.getMetaData() you might have seen getColumnLabel(int) which will return the suggested name at a given column number.

// You are getting the Generated Keys here.
pm = connection.prepareStatement(strQuery,Statement.RETURN_GENERATED_KEYS);
pm.executeUpdate();
ResultSet rsInsert = pm.getGeneratedKeys(); // <-- This ResultSet is from the
                                            // insert. Not a standard Query.
if(rsInsert != null && rsInsert.next()){
  int count = rsInsert.getMetaData().getColumnCount();
  Map<String,Object> map = new HashMap<>();
  for(int i = 1;i <=count;i++)
  {
    String colName = rsInsert.getMetaData().getColumnLabel(i); // or ColumnName
    Object value = rsInsert.getObject(i);
  }
}

Edit

Obviously, if your JDBC driver doesn't follow the Javadoc specification in getGeneratedKeys ("Retrieves any auto-generated keys created as a result of executing this Statement object. If this Statement object did not generate any keys, an empty ResultSet object is returned.") then your results may differ.