PHP 操作MYSQL基礎知識

mysql_connect()
resource mysql_connect([string hostname [:port] [:/path/to/socket] [, string username] [word,string password] ])
範例：$conn = @mysql_connect("localhost", "username", "password") or dir("不能連線到Mysql Server");
使用該連線必須顯示的關閉連線

建立資料庫連線

mysql_pconnect()

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$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";

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mysql_select_db()> relink mysql_select_giding 🎜>$conn = @mysql_connect("localhost", "username", "password") or die("不能連接到Mysql Server");

@mysql_select_db("MyDatabase") or die("不能選擇這個資料庫，或數據庫不存在");

查詢MySQL

resource mysql_query (string query, [resource link_id])

$linkId = @mysql_connect("localhost", "username", "password") or die ("不能連接到Mysql Server");@mysql_select_db("MyDatabase") or die("不能選擇這個資料庫，或是資料庫不存在");$query = "select * from MyTable";$result = mysql_query($query);mysql_close();

若SQL查詢執行成功，則傳回資源標識符，失敗時傳回FALSE。若執行更新成功，則回傳TRUE，否則回傳FALSE

查詢MySQL

mysql_db_query()

resource mysql_db_query(string database, string query [ @mysql_connect("localhost", "username", "password") or die("不能連線到MysqlServer");$query = "select * from MyTable";$result = mysql_db_query("MyDatabase" , $query);mysql_close();為了讓程式碼清晰，不建議使用這個函數呼叫

取得並顯示資料

mysql_result()mixed mysql_result (resource resultset, introwfield] $query = "select id, name from MyTable order by name";

$result = mysql_query($query);

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mysql_fetch_row() = "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取得整個資料行，將值放在一個索引陣列中。通常會結使list()函數使用複製程式碼

取得並顯示資料

my_fetch_array()


my_fetch_array()
 int result_type])
$query = "select id, name from MyTable order by name";
$result = mysql_query($query);
while($row = mysql_fetch_array($result,MYy($result) {
 $id = $row["id"];
 $name = $row["name"];
 echo "Name: $name ($id) ";
}
result_type的值有：

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取得並顯示數據

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取得並顯示資料

mysql_fetch_object()object mysql_fetch_object(resource result_set)

$query = "select id, name from MyTable order by name"; > $id = $row->id;

在操作上與mysql_fetch_array()相同


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mysql_num_rows()

int mysql_num_rows(resource result_set)

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int mysql_affected_rows([resource link_id])

$query = "update MyTable set name="CheneyFu" where id>=5";$echo "ID大於等於5的名稱被更新了的記錄數：".mysql_affected_rows();函數取得受INSERT,UPDATE或DELETE更新語句影響的行數

取得資料庫清單資訊

resource mysql_list_dbs([resource link_id])mysql_connect("localhost", "username", "password");$dbs = mysql_list_dbs();ee
";while (list($db) = mysql_fetch_rows($dbs)) {

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取得資料庫名稱

mysql_db_mysql. resource result_set, integer index)該函數獲取在mysql_list_dbs()所返回result_set中位於指定index索引的數據庫名複製代碼

取得資料庫表格清單







mysql_list_tables()
resource mys_list_tables(string links [tables(string >mysql_connect("localhost", "username", "password");
$tables = mysql_list_tables("MyDatabase");

複製程式碼取得資料庫表名mysql_tablename()string my_tablename(resource result_set, integer ", "username", "password");$tables = mysql_list_tables("MyDatabase");$count = -1;while ( $count while ( $count echo mysql_tablename($tables, $count)."
";}函數取得mysql_list_tables()所傳回result_set中位於指定index索引的表名 複製程式碼

取得欄位資訊

my_fetch_field()


my_fetch_field()


my_fetch_field()mysql_connect("localhost", "username", "password");
mysql_select_db("MyDatabase");
$query = "select * from MyTable";
$result = mysql_query($query);

}

複製程式碼傳回的物件共有12個物件屬性： 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0 primary_key: 若欄位為主鍵，則為1，否則0 unique_key: 若欄位是唯一鍵，則為1， 否則0 multiple_key: 若欄位為非唯一，則為1，否則0 numeric: 若欄位為數值則為1，否則0 blob: 若欄位為BLOB則為1，否則為0 type: 欄位的資料類型 unsigned: 若欄位為無符號數則為1，否則為0 zerofill: 若欄位為「零填充」則為1， 否則為0

mysql_num_fields()

$query = "select id, name from MyTable order by name";$result = mysql_query($query);echo "這個查詢的字段數是：".mysql_num_fields($result). "
";

傳回查詢result_set中的欄位數



取得指定表格的所有欄位的欄位名稱

(string database_name, string table_name [, resource link_id])$fields = mysql_list_fields("MyDatabase", "MyTable");echo "資料庫MyDatabaseMyTableTableTable集的欄位數： ".mysql_num_fields($fields) ."
";

mysql_field_flags()string mysql_field_flags (resource result_set, integerfield_offset)

mysql_field_len()

mysql_field_len()

integer field_offset)$query = "select name from MyTable";$result = mysql_query($query);$row = mysql_fetch_row($result);echocho mysqlfield_lencho(fetch_row($result);

echo mysql_ult_lencho mysql,0$ )."
";

取得欄位名稱

mysql_field_name()mysql_field_name()

$row = my_fetch_row($result); >echo mysql_field_name($result, 0); // Result: PKID



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取得欄位類型

mysql_field_type()string mysql_field_type (resource result_set, int field_offset)

Myquery (resource result_set, int field_offset) by name";

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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 = quesqlry); $row = mysql_fetch_row($result);echo mysql_field_table($result, 0); // Result: MyTable複製代碼