ResultSet selectresult = this.executequery(sql_temp);

int column_count=selectresult.getMetaData().getColumnCount();

int row_count=selectresult.getRow();

this.con = DriverManager.getConnection(url, user, password);
this.stmt = con.createStatement();
ResultSet selectresult =this.stmt.executeQuery(sql);
int column_count = selectresult.getMetaData().getColumnCount();
int size = 0;
while (selectresult.next() && size < 10) {
    String selectresult_single = "";
    for (int i = 1; i <= column_count; i++) {
        String ColumnName = selectresult.getMetaData().getColumnName(i);
        String ColumnValue = selectresult.getString(i);
        selectresult_single = selectresult_single + ColumnName + "=" + ColumnValue + " ";
    }
    size = size + 1;
}