1、mysql_connect()-建立數據庫連接
格式:
resource mysql_connect([string hostname [:port] [:/path/to/socket] [, string username] [, string password]])
例:
$conn = @mysql_connect("localhost", "username", "password") or die("不能連接到Mysql Server");
說明:使用該連接必須顯示的關閉連接
2、mysql_pconnect()-建立數據庫連接
格式:
resource mysql_pconnect([string hostname [:port] [:/path/to/socket] [, string username] [, string password]])
例:
$conn = @mysql_pconnect("localhost", "username", "password") or dir("不能連接到Mysql Server");
說明:使用該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()-關閉數據庫連接
例:
$conn = @mysql_connect("localhost", "username", "password") or die("不能連接到Mysql Server");
@mysql_select_db("MyDatabase") or die("不能選擇這個數據庫,或數據庫不存在");
echo "你已經連接到MyDatabase數據庫";
mysql_close();
4、mysql_select_db()-選擇數據庫
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("不能選擇這個數據庫,或數據庫不存在");
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("不能選擇這個數據庫,或者數據庫不存在");
$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:為了使代碼清晰,不推薦使用這個函數調用
7、mysql_result()-獲取和顯示數據
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、也是效率最低的數據獲取函數
8、mysql_fetch_row()-獲取和顯示數據
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
9、mysql_fetch_array()-獲取和顯示數據
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: 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。
10、mysql_fetch_assoc()-獲取和顯示數據
格式:
array mysql_fetch_assoc (resource result_set)
相當於調用 mysql_fetch_array(resource, MYSQL_ASSOC);
11、mysql_fetch_object()-獲取和顯示數據
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查詢所獲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:該函數獲取受INSERT,UPDATE或DELETE更新語句影響的行數
14、mysql_list_dbs()-獲取數據庫列表信息
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:顯示所有數據庫名稱
15、mysql_db_name()-獲取數據庫名
格式:
string mysql_db_name(resource result_set, integer index)
說明: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
16、mysql_list_tables()-獲取數據庫表列表
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:該函數獲取database中所有表的表名
17、mysql_tablename()-獲取某個數據庫表名
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:該函數獲取mysql_list_tables()所返回result_set中位於指定index索引的表名
18、mysql_fetch_field()-獲取字段信息
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: 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0
primary_key: 如果字段為主鍵,則為1,否則0
unique_key: 如果字段是唯一鍵,則為1, 否則0
multiple_key: 如果字段為非唯一,則為1,否則0
numeric: 如果字段為數值則為1,否則0
blob: 如果字段為BLOB則為1,否則為0
type: 字段的數據類型
unsigned: 如果字段為無符號數則為1,否則為0
zerofill: 如果字段為“零填充”則為1, 否則為0
19、mysql_num_fields()-獲取查詢的字段個數
格式:
integer mysql_num_fields(resource result_set)
例:
$query = "select id,name from MyTable order by name";
$result = mysql_query($query);
echo "這個查詢的字段數是:".mysql_num_fields($result)."<br />";
20、mysql_list_fields()-獲取指定表的所有字段的字段名
格式:
resource mysql_list_fields (string database_name, string table_name [, resource link_id])
例:
$fields =mysql_list_fields("MyDatabase", "MyTable");
echo "數據庫MyDatabase中表MyTable的字段數: ".mysql_num_fields($fields)."<br />";
21、mysql_field_flags()-獲取指定的字段選項
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()-獲取指定的字段的最大長度
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()-獲取字段名
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()-獲取字段類型
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()-獲取字段所在表名
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