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mysqli_select_db (PHP 5) mysqli_select_db (no version information, might be only in CVS) mysqli->select_db() -- Selects the default database for database queries 说明Procedural style: bool mysqli_select_db ( mysqli link, string dbname ) Object oriented style (method): class mysqli { bool select_db ( string dbname ) }
Selects the default database to be used when performing queries against
the database connection.
注意:
This function should only be used to change the default database for the
connection. You can select the default database with 4th parameter in
mysqli_connect().
返回值
如果成功则返回 TRUE，失败则返回 FALSE。
范例例 1. Object oriented style <?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "test");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
/* return name of current default database */
if ($result = $mysqli->query("SELECT DATABASE()")) {
$row = $result->fetch_row();
printf("Default database is %s.\n", $row[0]);
$result->close();
}
/* change db to world db */
$mysqli->select_db("world");
/* return name of current default database */
if ($result = $mysqli->query("SELECT DATABASE()")) {
$row = $result->fetch_row();
printf("Default database is %s.\n", $row[0]);
$result->close();
}
$mysqli->close();
?> |
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例 2. Procedural style <?php
$link = mysqli_connect("localhost", "my_user", "my_password", "test");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
/* return name of current default database */
if ($result = mysqli_query($link, "SELECT DATABASE()")) {
$row = mysqli_fetch_row($result);
printf("Default database is %s.\n", $row[0]);
mysqli_free_result($result);
}
/* change db to world db */
mysqli_select_db($link, "world");
/* return name of current default database */
if ($result = mysqli_query($link, "SELECT DATABASE()")) {
$row = mysqli_fetch_row($result);
printf("Default database is %s.\n", $row[0]);
mysqli_free_result($result);
}
mysqli_close($link);
?> |
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上例将输出： Default database is test.
Default database is world. |
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