//增加字段
mysql_select_db(”hills_database_test”,$dbcon);
$altersql=”alter table hills_testcreatetable add fourth varchar(255);”;
mysql_query($altersql,$dbcon);
mysql_close($dbcon);

//修改字段
mysql_select_db(”hills_database_test”,$dbcon);
$alteredit=”alter table hills_testcreatetable change fourth edit_fourth varchar(128);”;
mysql_query($alteredit,$dbcon);
mysql_close($dbcon);

//删除字段
mysql_select_db(”hills_database_test”,$dbcon);
$alterdelete=”alter table hills_testcreatetable drop edit_fourth;”;
mysql_query($alterdelete,$dbcon);
mysql_close($dbcon);

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