PHP中的MYSQL常用函數(php下操作資料庫必備)

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1、mysql_connect()-建立資料庫連接格式：resource mysql_connect([string hostname [:port] [:/path/to/socket] [, string username] [, string password]])例：$conn = @mysql_connect("localhost", "username", "password") or die("不能串連到Mysql Server");說明：使用該串連必須顯示的關閉串連2、mysql_pconnect()-建立資料庫連接格式：resource mysql_pconnect([string hostname [:port] [:/path/to/socket] [, string username] [, string password]])例：$conn = @mysql_pconnect("localhost", "username", "password") or dir("不能串連到Mysql Server");說明：使用該串連函數不需要顯示的關閉串連，它相當於使用了串連池3、mysql_close()-關閉資料庫連接例：$conn = @mysql_connect("localhost", "username", "password") or die("不能串連到Mysql Server");@mysql_select_db("MyDatabase") or die("不能選擇這個資料庫，或資料庫不存在");echo "你已經串連到MyDatabase資料庫";mysql_close();4、mysql_select_db()-選擇資料庫格式：boolean mysql_select_db(string db_name [, resource link_id])例：$conn = @mysql_connect("localhost", "username", "password") or die("不能串連到Mysql Server");@mysql_select_db("MyDatabase") or die("不能選擇這個資料庫，或資料庫不存在");5、mysql_query()-查詢MySQL格式：resource mysql_query (string query, [resource link_id])例：$linkId = @mysql_connect("localhost", "username", "password") or die("不能串連到Mysql Server");@mysql_select_db("MyDatabase") or die("不能選擇這個資料庫，或者資料庫不存在");$query = "select * from MyTable";$result = mysql_query($query);mysql_close();說明：若SQL查詢執行成功，則返回資源標識符，失敗時返回FALSE。若執行更新成功，則返回TRUE，否則返回FALSE6、mysql_db_query()-查詢MySQL格式：resource mysql_db_query(string database, string query [, resource link_id])例：$linkId = @mysql_connect("localhost", "username", "password") or die("不能串連到MysqlServer");$query = "select * from MyTable";$result = mysql_db_query("MyDatabase", $query);mysql_close();說明：為了使代碼清晰，不推薦使用這個函數調用7、mysql_result()-擷取和顯示資料格式：mixed mysql_result (resource result_set, int row [, mixed field])例：$query = "select id, name from MyTable order by name";$result = mysql_query($query);for($count=0;$count<=mysql_numrows($result);$count++){$c_id = mysql_result($result, 0, "id");$c_name = mysql_result($result, 0, "name");echo $c_id,$c_name;}說明：最簡單、也是效率最低的資料擷取函數8、mysql_fetch_row()-擷取和顯示資料格式：array mysql_fetch_row (resource result_set)例：$query = "select id, name from MyTable order by name";$result = mysql_query($query);while (list($id, $name) = mysql_fetch_row($result)) {echo("Name: $name ($id) <br />");}說明：函數從result_set中擷取整個資料行，將值放在一個索引數組中。通常會結使list()函數使用9、mysql_fetch_array()-擷取和顯示資料格式：array mysql_fetch_array (resource result_set [, int result_type])例：$query = "select id, name from MyTable order by name";$result = mysql_query($query);while($row = mysql_fetch_array($result, MYSQL_ASSOC)) {$id = $row["id"];$name = $row["name"];echo "Name: $name ($id) <br />";}又例：$query = "select id, name from MyTable order by name";$result = mysql_query($query);while($row = mysql_fetch_array($result, MYSQL_NUM)) {$id = $row[0];$name = $row[1];echo "Name: $name ($id) <br />";}說明：result_type的值有：MYSQL_ASSOC: 欄位名表示鍵，欄位內容為值MYSQL_NUM: 數值索引數組，操作與mysql_fetch_ros()函數一樣MYSQL_BOTH: 即作為關聯陣列又作為數值索引數組返回。result_type的預設值。10、mysql_fetch_assoc()-擷取和顯示資料格式：array mysql_fetch_assoc (resource result_set)相當於調用 mysql_fetch_array(resource, MYSQL_ASSOC);11、mysql_fetch_object()-擷取和顯示資料格式：object mysql_fetch_object(resource result_set)例：$query = "select id, name from MyTable order by name";while ($row = mysql_fetch_object($result)) {$id = $row->id;$name = $row->name;echo "Name: $name ($id) <br />";}說明：返回一個對象，在操作上與mysql_fetch_array()相同12、mysql_num_rows()-所選擇的記錄的個數格式：int mysql_num_rows(resource result_set)例：query = "select id, name from MyTable where id > 65";$result = mysql_query($query);echo "有".mysql_num_rows($result)."條記錄的ID大於65";說明：只在確定select查詢所擷取的記錄數時才有用。13、mysql_affected_rows()－受Insert,update,delete影響的記錄的個數格式：int mysql_affected_rows([resource link_id])例：$query = "update MyTable set name=‘CheneyFu‘ where id>=5";$result = mysql_query($query);echo "ID大於等於5的名稱被更新了的記錄數：".mysql_affected_rows();說明：該函數擷取受INSERT,UPDATE或DELETE更新語句影響的行數14、mysql_list_dbs()-擷取資料庫列表資訊格式：resource mysql_list_dbs([resource link_id])例：mysql_connect("localhost", "username", "password");$dbs = mysql_list_dbs();echo "Databases: <br />";while (list($db) = mysql_fetch_rows($dbs)) {echo "$db <br />";}說明：顯示所有資料庫名稱15、mysql_db_name()-擷取資料庫名格式：string mysql_db_name(resource result_set, integer index)說明：該函數擷取在mysql_list_dbs()所返回result_set中位於指定index索引的資料庫名16、mysql_list_tables()-擷取資料庫表列表格式：resource mysql_list_tables(string database [, resource link_id])例：mysql_connect("localhost", "username", "password");$tables = mysql_list_tables("MyDatabase");while (list($table) = mysql_fetch_row($tables)) {echo "$table <br />";}說明：該函數擷取database中所有表的表名17、mysql_tablename()-擷取某個資料庫表名格式：string mysql_tablename(resource result_set, integer index)例：mysql_connect("localhost", "username", "password");$tables = mysql_list_tables("MyDatabase");$count = -1;while (++$count < mysql_numrows($tables)) {echo mysql_tablename($tables, $count)."<br />";}說明：該函數擷取mysql_list_tables()所返回result_set中位於指定index索引的表名18、mysql_fetch_field()-擷取欄位資訊格式：object mysql_fetch_field(resource result [, int field_offset])例：mysql_connect("localhost", "username", "password");mysql_select_db("MyDatabase");$query = "select * from MyTable";$result = mysql_query($query);$counts = mysql_num_fields($result);for($count = 0; $count < $counts; $count++) {$field = mysql_fetch_field($result, $count);echo "<p>$field->name $field->type ($field->max_length) </p>";}說明：返回的對象共有12個對象屬性：name: 欄位名table: 欄位所在的表max_length:欄位的最大長度not_null: 如果欄位不能為null,則為1,否則0primary_key: 如果欄位為主鍵，則為1，否則0unique_key: 如果欄位是唯一鍵，則為1， 否則0multiple_key: 如果欄位為非唯一，則為1，否則0numeric: 如果欄位為數值則為1，否則0blob: 如果欄位為BLOB則為1，否則為0type: 欄位的資料類型unsigned: 如果欄位為無符號數則為1，否則為0zerofill: 如果欄位為“零填充”則為1， 否則為019、mysql_num_fields()-擷取查詢的欄位個數格式：integer mysql_num_fields(resource result_set)例：$query = "select id,name from MyTable order by name";$result = mysql_query($query);echo "這個查詢的欄位數是：".mysql_num_fields($result)."<br />";20、mysql_list_fields()-擷取指定表的所有欄位的欄位名格式：resource mysql_list_fields (string database_name, string table_name [, resource link_id])例：$fields =mysql_list_fields("MyDatabase", "MyTable");echo "資料庫MyDatabase中表MyTable的欄位數： ".mysql_num_fields($fields)."<br />";21、mysql_field_flags()-擷取指定的欄位選項格式：string mysql_field_flags (resource result_set, integer field_offset)例：$query = "select id, name from MyTable order by name";$result = mysql_query($query);$row=mysql_fetch_wor($row);22、mysql_field_len()-擷取指定的欄位的最大長度格式：integer mysql_field_len (resource result_set, integer field_offset)例：$query = "select name from MyTable";$result = mysql_query($query);$row = mysql_fetch_row($result);echo mysql_field_len($result, 0)."<br />";說明：如果mysql_field_len($reseult, 0) = 16777215那麼numer_format(mysql_field_len($result))等於16,777,21523、mysql_field_name()-擷取欄位名格式：string mysql_field_name (resource result_set, int field_offset)例：$query = "select id as PKID, name from MyTable order by name";$result = mysql_query($query);$row = mysql_fetch_row($result);echo mysql_field_name($result, 0); // Result: PKID24、mysql_field_type()-擷取欄位類型格式：string mysql_field_type (resource result_set, int field_offset)例：$query = "select id, name from MyTable order by name";$result = mysql_query($query);$row = mysql_fetch_row($result);echo mysql_field_type($result, 0); // Result: int25、mysql_field_table()-擷取欄位所在表名格式：string mysql_field_table (resource result_set, int field_offset)例：$query = "select id as PKID, name from MyTable order by name";$result = mysql_query($query);$row = mysql_fetch_row($result);echo mysql_field_table($result, 0); // Result: MyTable 
轉於：http://www.jb51.net/article/24799.htm

 

PHP中的MYSQL常用函數(php下操作資料庫必備)