1、mysql_connect()-建立資料庫連線格式:
resource mysql_connect([string hostname [:port] [:/path/to/socket] [, string username] [, string password]])
例:
$conn = @mysql_connect(”localhost”, “username”, “password”) or dir(”不能連接到Mysql Server”);
說明:使用此連線必須顯示的關閉連線
2、mysql_pconnect()-建立資料庫連線格式:
resource mysql_pconnect([string hostname [:port] [:/path/to/socket] [, string username] [, string password]])
例:
$conn = @mysql_pconnect(”localhost”, “username”, “password”) or dir(”不能連接到Mysql Server”);
說明:使用此連接函數不需要顯示的關閉連接,它相當於使用了連接池
3、mysql_close()-關閉資料庫連接例:
$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,或資料庫不存在”);
echo 「你已經連線到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(”不能連接到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();
說明: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
6、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(”不能連接到MysqlServer”);
$query = “select * from MyTable”;
$result = mysql_db_query(”MyDatabase”, $query);
mysql_close();
說明:為了讓程式碼清晰,不建議使用這個函數呼叫
7、mysql_result()-取得和顯示資料格式:
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取得函數
8、mysql_fetch_row()-取得和顯示資料格式:
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
9、mysql_fetch_array()-取得和顯示資料格式:
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: 欄位名稱表示鍵,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: 即作為關聯數組又作為數值索引數組傳回。 result_type的預設值。
10、mysql_fetch_assoc()-取得和顯示資料格式:
array mysql_fetch_assoc (resource result_set)
相當於呼叫mysql_fetch_array(resource, MYSQL_ASSOC);
11、mysql_fetch_object()-取得和顯示資料格式:
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:傳回一個對象,在操作上與mysql_fetch_array()相同
12、mysql_num_rows()-所選的記錄的個數格式:
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).”筆記錄的ID大於65″;
說明:只有在確定select查詢所取得的記錄數時才有用。
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:此函數取得受INSERT,UPDATE或DELETE更新語句影響的行數
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14、mysql_list_dbs()-取得資料庫清單資訊格式:
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()-取得資料庫名稱格式:
string mysql_db_name(resource result_set, integer index)
說明:函數取得在mysql_list_dbs()所傳回result_set中位於指定index索引的資料庫名稱
16、mysql_list_tables()-取得資料庫表格清單格式:
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:此函數取得database中所有表的表名
17、mysql_tablename()-取得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:函數取得mysql_list_tables()所傳回result_set中位於指定index索引的表名
18、mysql_fetch_field()-取得欄位資訊格式:
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:
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
19、mysql_num_fields()-取得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()-取得指定表格的所有欄位的欄位名稱格式:
resource mysql_list_fields (string database_name, string table_name [, resource link_id])
例:
$fields = mysql_list_fields(”MyDatabase”, “MyTable”);
echo “資料庫MyDatabase中表格MyTable的欄位數: “.mysql_num_fields($fields).”<br />”;
21、mysql_field_flags()-取得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()-取得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16,777,215
23、mysql_field_name()-取得欄位名格式:
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: PKID
24、mysql_field_type()-取得欄位類型格式:
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: int
25、mysql_field_table()-取得欄位所在表格名稱格式:
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