此函数在php官方网站,我看了很多次,也研究了很多次,可是却一直没搞明白,一直到刚刚,写下来,做个笔记吧。
对于该函数我理解的也就是下面几种用法吧。我把代码从官网上帖过来,再加上自己理解的部分:
Examples
Example #1 Basic oci_connect() using Easy Connect syntax
<?php
// Connects to the XE service (i.e. database) on the "localhost" machine
$conn = oci_connect('hr', 'welcome', 'localhost/XE');//这里XE其实就是你要访问的数据库主机名,开始我一直理解的是数据库名,所以这个函数我就不一直没搞明白
if (!$conn) {
$e = oci_error();
trigger_error(htmlentities($e['message'], ENT_QUOTES), E_USER_ERROR);
}
$stid = oci_parse($conn, 'SELECT * FROM employees');
oci_execute($stid);
echo "<table border='1'>\n";
while ($row = oci_fetch_array($stid, OCI_ASSOC+OCI_RETURN_NULLS)) {
echo "<tr>\n";
foreach ($row as $item) {
echo " <td>" . ($item !== null ? htmlentities($item, ENT_QUOTES) : " ") . "</td>\n";
}
echo "</tr>\n";
}
echo "</table>\n";
?>
Example #2 Basic oci_connect() using a Network Connect name
<?php
// Connects to the MYDB database described in tnsnames.ora file,
// One example tnsnames.ora entry for MYDB could be:
// MYDB =
// (DESCRIPTION =
// (ADDRESS = (PROTOCOL = TCP)(HOST = mymachine.oracle.com)(PORT = 1521))
// (CONNECT_DATA =
// (SERVER = DEDICATED)
// (SERVICE_NAME = XE)
// )
// )
$conn = oci_connect('hr', 'welcome', 'MYDB');//MYDB这个名字就是在本机上安装配置oracle数据库客户端时,tnsnames.ora文件中,所配置的关于要访问的数据库的情况,就是此代码框中上面那些注释部分,所起的名字,这名字可是任何。
if (!$conn) {
$e = oci_error();
trigger_error(htmlentities($e['message'], ENT_QUOTES), E_USER_ERROR);
}
$stid = oci_parse($conn, 'SELECT * FROM employees');
oci_execute($stid);
echo "<table border='1'>\n";
while ($row = oci_fetch_array($stid, OCI_ASSOC+OCI_RETURN_NULLS)) {
echo "<tr>\n";
foreach ($row as $item) {
echo " <td>" . ($item !== null ? htmlentities($item, ENT_QUOTES) : " ") . "</td>\n";
}
echo "</tr>\n";
}
echo "</table>\n";
?>
<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "world");//这又是一种方式,这个在官方网站没有例子
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
/* Create table doesn't return a resultset */
if (mysqli_query($link, "CREATE TEMPORARY TABLE myCity LIKE City") === TRUE) {
printf("Table myCity successfully created.\n");
}
/* Select queries return a resultset */
if ($result = mysqli_query($link, "SELECT Name FROM City LIMIT 10")) {
printf("Select returned %d rows.\n", mysqli_num_rows($result));
/* free result set */
mysqli_free_result($result);
}
/* If we have to retrieve large amount of data we use MYSQLI_USE_RESULT */
if ($result = mysqli_query($link, "SELECT * FROM City", MYSQLI_USE_RESULT)) {
/* Note, that we can't execute any functions which interact with the
server until result set was closed. All calls will return an
'out of sync' error */
if (!mysqli_query($link, "SET @a:='this will not work'")) {
printf("Error: %s\n", mysqli_error($link));
}
mysqli_free_result($result);
}
mysqli_close($link);
?>
其它的例子我还没搞明白,有明白的,可是交流一下。