php連接mysql

1、PHP連接MySQL使用PHP訪問(wèn)MySQL★訪問(wèn)前要先過(guò)濾用戶輸入的字符串.用到的函數(shù):trim()get_magic_quotes_gpc()addslashes()stripslashes()htmlspecials()將HTML特定的符號(hào)進(jìn)行轉(zhuǎn)換$new=htmlspecials(“Test“ENT_QUOTES)echo$new輸出為:ahref=testTesta★連接MySQL構(gòu)造mysqli類這時(shí)可以通過(guò)調(diào)用對(duì)象的方法(

2、類似于$dbclose())來(lái)查詢$mysqli=newmysqli(localhostmy_usermy_passwdmy_db8000)$mysqli是一個(gè)對(duì)象mysqli是一個(gè)類構(gòu)造函數(shù)的參數(shù)依次為:主機(jī)用戶密碼數(shù)據(jù)庫(kù)端口Socket號(hào)一般來(lái)說(shuō)要加止抑制錯(cuò)誤符號(hào)@@$mysqli=newmysqli(localhostmy_usermy_passwdmy_db8000)連接是否成功可以通過(guò)函數(shù)來(lái)判斷亦可以使用過(guò)程方法這時(shí)要查詢就要

3、使用類似于mysqli_close($link)的方式了$link=mysqli_connect(localhostmy_usermy_passwdmy_db8000)$link是一個(gè)資源檢測(cè)是否連接成功:if(!$mysqli)連接時(shí)使用@抑制錯(cuò)誤此時(shí)再判斷退出(或繼續(xù))die(ConnectErr:.mysqli_connect_errno())die相當(dāng)于exit()函數(shù)echostripslashes($row[“Name“])

4、把多余的刪除while($row=$resultfetch_row())printf(“%s(%s)n“$row[0]$row[1])?fetch_row以枚舉形式返回，類似于$row[0]$rou[1]的形式while($row=mysqli_fetch_row($result))printf(“%s(%s)n“$row[0]$row[1])?fetch_object將一行取回到一個(gè)對(duì)象中；訪問(wèn)時(shí)通過(guò)$objname$objAddre

5、ss來(lái)實(shí)現(xiàn)while($obj=$resultfetch_object())printf(“%s(%s)n“$objName$objAddress)?MySQLi_result類的屬性、函數(shù)說(shuō)明：mysqli_resultcurrent_field—Getcurrentfieldoffsetofaresultpointermysqli_result::data_seek—Adjuststheresultpointertoanarbita

6、ryrowintheresultmysqli_result::fetch_all—Fetchesallresultrowsasanassociativearrayanumericarraybothmysqli_result::fetch_array—Fetcharesultrowasanassociativeanumericarraybothmysqli_result::fetch_assoc—Fetcharesultrowasanas

7、sociativearray(以相關(guān)數(shù)組返回；即以key=value的形式)mysqli_result::fetch_field_direct—Fetchmetadatafasinglefieldmysqli_result::fetch_field—Returnsthenextfieldintheresultsetmysqli_result::fetch_fields—Returnsanarrayofobjectsrepresentin