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PHP與MYSQL交互函數表學習筆記

瀏覽：58日期：2024-02-12 13:59:29

最近一直在研究PHP與MYSQL，感覺PHP與MYSQL交互的函數都是過程化的，當然也有mysqli擴展，面向對象，Java和C#寫多了之后，再寫PHP，有些不適應，感覺又回到了學C的年代。今天學習了一些函數，記錄下來，以便日后忘記時，可以參考。

說明函數名函數詳細函數說明建立數據庫連接mysql_connect()resource mysql_connect([string hostname [:port] [:/path/to/socket] [, string username] [, string password]])示例：$conn = @mysql_connect('localhost', 'username', 'password') or dir('不能連接到Mysql Server');使用該連接必須顯示的關閉連接建立數據庫連接mysql_pconnect()resource mysql_pconnect([string hostname [:port] [:/path/to/socket] [, string username] [, string password]])示例：$conn = @mysql_pconnect('localhost', 'username', 'password') or dir('不能連接到Mysql Server');使用該連接函數不需要顯示的關閉連接，它相當于使用了連接池關閉數據庫連接mysql_close()$conn = @mysql_connect('localhost', 'username', 'password') or die('不能連接到Mysql Server');@mysql_select_db('MyDatabase') or die('不能選擇這個數據庫，或數據庫不存在');echo '你已經連接到MyDatabase數據庫';mysql_close()　選擇數據庫mysql_select_db()boolean mysql_select_db(string db_name [, resource link_id])$conn = @mysql_connect('localhost', 'username', 'password') or die('不能連接到Mysql Server');@mysql_select_db('MyDatabase') or die('不能選擇這個數據庫，或數據庫不存在');　查詢MySQLmysql_query()resource mysql_query (string query, [resource link_id])$linkId = @mysql_connect('localhost', 'username', 'password') or die('不能連接到Mysql Server');@mysql_select_db('MyDatabase') or die('不能選擇這個數據庫，或者數據庫不存在');$query = 'select * from MyTable';$result = mysql_query($query);mysql_close();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FALSE查詢MySQLmysql_db_query()resource mysql_db_query(string database, string query [, resource link_id])$linkId = @mysql_connect('localhost', 'username', 'password') or die('不能連接到MysqlServer');$query = 'select * from MyTable';$result = mysql_db_query('MyDatabase', $query);mysql_close();為了使代碼清晰，不推薦使用這個函數調用獲取和顯示數據mysql_result()mixed mysql_result (resource result_set, int row [, mixed field])$query = 'select id, name from MyTable order by name';$result = mysql_query($query);$c_id = mysql_result($result, 0, 'id');$c_name = mysql_result($result, 0, 'name');最簡單、也是效率最低的數據獲取函數獲取和顯示數據mysql_fetch_row()array mysql_fetch_row (resource result_set)$query = 'select id, name from MyTable order by name';$result = mysql_query($query);while (list($id, $name) = mysql_fetch_row($result)) { echo('Name: $name ($id) ');}函數從result_set中獲取整個數據行，將值放在一個索引數組中。通常會結使list()函數使用獲取和顯示數據mysql_fetch_array()array mysql_fetch_array (resource result_set [, int result_type])$query = 'select id, name from MyTable order by name';$result = mysql_query($query);while($row = mysql_fetch_array($result, MYSQL_ASSOC)) { $id = $row['id']; $name = $row['name']; echo 'Name: $name ($id) ';}result_type的值有：MYSQL_ASSOC: 字段名表示鍵，字段內容為值MYSQL_NUM: 數值索引數組，操作與mysql_fetch_ros()函數一樣MYSQL_BOTH: 即作為關聯數組又作為數值索引數組返回。result_type的默認值。獲取和顯示數據mysql_fetch_assoc()array mysql_fetch_assoc (resource result_set)相當于調用 mysql_fetch_array(resource, MYSQL_ASSOC);　獲取和顯示數據mysql_fetch_object()object mysql_fetch_object(resource result_set)$query = 'select id, name from MyTable order by name';while ($row = mysql_fetch_object($result)) { $id = $row->id; $name = $row->name; echo 'Name: $name ($id) ';}在操作上與mysql_fetch_array()相同所選擇的記錄mysql_num_rows()int mysql_num_rows(resource result_set)#query = 'select id, name from MyTable where id > 65';$result = mysql_query($query);echo '有'.mysql_num_rows($result).'條記錄的ID大于65';只在確定select查詢所獲取的記錄數時才有用。受影響的記錄mysql_affected_rows()int mysql_affected_rows([resource link_id])$query = 'update MyTable set name='CheneyFu' where id>=5';$result = mysql_query($query);echo 'ID大于等于5的名稱被更新了的記錄數：'.mysql_affected_rows();該函數獲取受INSERT,UPDATE或DELETE更新語句影響的行數獲取數據庫列表信息mysql_list_dbs()resource mysql_list_dbs([resource link_id])mysql_connect('localhost', 'username', 'password');$dbs = mysql_list_dbs();echo 'Databases: ';while (list($db) = mysql_fetch_rows($dbs)) { echo '$db ';}　獲取數據庫名mysql_db_name()string mysql_db_name(resource result_set, integer index)該函數獲取在mysql_list_dbs()所返回result_set中位于指定index索引的數據庫名獲取數據庫表列表mysql_list_tables()resource mysql_list_tables(string database [, resource link_id])mysql_connect('localhost', 'username', 'password');$tables = mysql_list_tables('MyDatabase');while (list($table) = mysql_fetch_row($tables)) { echo '$table ';}該函數獲取database中所有表的表名獲取數據庫表名mysql_tablename()string mysql_tablename(resource result_set, integer index)mysql_connect('localhost', 'username', 'password');$tables = mysql_list_tables('MyDatabase');$count = -1;while (++$count < mysql_numrows($tables)) { echo mysql_tablename($tables, $count).' ';}該函數獲取mysql_list_tables()所返回result_set中位于指定index索引的表名獲取字段信息mysql_fetch_field()object mysql_fetch_field(resource result [, int field_offset])mysql_connect('localhost', 'username', 'password');mysql_select_db('MyDatabase');$query = 'select * from MyTable';$result = mysql_query($query);$fields = mysql_num_fields($result);for($count = 0; $count < $fieds; $count++) { $field = mysql_fetch_field($result, $count); echo '$field->name $field->type ($field->max_length) ';}返回的對象共有12個對象屬性：name: 字段名table: 字段所在的表max_length: 字段的最大長度not_null: 如果字段不能為null，則為1，否則0primary_key: 如果字段為主鍵，則為1，否則0unique_key: 如果字段是唯一鍵，則為1，否則0multiple_key: 如果字段為非唯一，則為1，否則0numeric: 如果字段為數值則為1，否則0blob: 如果字段為BLOB則為1，否則為0type: 字段的數據類型unsigned: 如果字段為無符號數則為1，否則為0zerofill: 如果字段為“零填充”則為1，否則為0獲取查詢的字段數mysql_num_fields()integer mysql_num_fields (resource result_set)$query = 'select id, name from MyTable order by name';$result = mysql_query($query);echo '這個查詢的字段數是：'.mysql_num_fields($result).' ';返回查詢result_set中的字段數獲取指定表的所有字段的字段名mysql_list_fields()resource mysql_list_fields (string database_name, string table_name [, resource link_id])$fields = mysql_list_fields('MyDatabase', 'MyTable');echo '數據庫MyDatabase中表MyTable的字段數： '.mysql_num_fields($fields).' ';　獲取指定的字段選項mysql_field_flags()string mysql_field_flags (resource result_set, integer field_offset)　獲取指定的字段的最大長度mysql_field_len()integer mysql_field_len (resource result_set, integer field_offset)$query = 'select name from MyTable';$result = mysql_query($query);$row = mysql_fetch_row($result);echo mysql_field_len($result, 0).' ';如果mysql_field_len($reseult, 0) = 16777215那么numer_format(mysql_field_len($result))等于16,777,215獲取字段名mysql_field_name()string mysql_field_name (resource result_set, int field_offset)$query = 'select id as PKID, name from MyTable order by name';$result = mysql_query($query);$row = mysql_fetch_row($result);echo mysql_field_name($result, 0); // Result: PKID　獲取字段類型mysql_field_type()string mysql_field_type (resource result_set, int field_offset)$query = 'select id, name from MyTable order by name';$result = mysql_query($query);$row = mysql_fetch_row($result);echo mysql_field_type($result, 0); // Result: int　獲取字段所在表名mysql_field_table()string mysql_field_table (resource result_set, int field_offset)$query = 'select id as PKID, name from MyTable order by name';$result = mysql_query($query);$row = mysql_fetch_row($result);echo mysql_field_table($result, 0); // Result: MyTable

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