ROWNUM伪列给查询结果添加序列。SELECT ROWNUM, column1, column2 FROM table_name;ROWNUM伪列给查询结果添加序列。SELECT ROWNUM, column1, column2 FROM table_name;$db>query() 方法来查询数据。，，``php，$sql = "SELECT * FROM my_table";，$result = $db>query($sql);，while ($row = $result>fetch_assoc()) {， echo $row['column_name'];，}，``php，$sql = "SELECT * FROM my_table";，$result = $db>query($sql);，while ($row = $result>fetch_assoc()) {， echo $row['column_name'];，}，``php，$sql = "SELECT * FROM my_table";，$result = $db>query($sql);，while ($row = $result>fetch_assoc()) {， echo $row['column_name'];，}，``Powered By Z-BlogPHP 1.7.3
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