官方手册中介绍说：
根据主键查找数据
通过调用find()方法,可以使用主键值轻松地在表中检索数据.假如你只想要查询某 一条数据,该方法将回返回一个zend_db_table_row对象,而当你想要查询多条记录时 ,将会返回一个zend_db_table_rowset对象.
<?php
class RoundTable extends Zend_Db_Table {}
$table = new RoundTable();
// SELECT * FROM round_table WHERE id = "1"
$row = $table->find(1);
// SELECT * FROM round_table WHERE id IN("1", "2", 3")
$rowset = $table->find(array(1, 2, 3));
?>
其实
" 假如你只想要查询某 一条数据,该方法将回返回一个zend_db_table_row对象"错误的，经测试返回的也是一个"zend_db_table_rowset对象":
代码：
<?php
require_once 'Zend/Db.php';
$params = array(
'host' => '127.0.0.1',
'username' => 'root',
'password' => '',
'dbname' => 'guestbook'
);
$db = Zend_Db::factory('PDO_MYSQL', $params);
// 为所有的Zend_Db_Table对象设定默认的adapter
require_once 'Zend/Db/Table.php';
Zend_Db_Table::setDefaultAdapter($db);
class Guestbook extends Zend_Db_Table {
}
$table = new Guestbook();
// SELECT * FROM round_table WHERE id = "1"
$row = $table->find(1);
var_dump($row);
// SELECT * FROM round_table WHERE id IN("1", "2", 3")
$rowset = $table->find(array(1, 2, 3));
var_dump($rowset);
?>
结果：
object(Zend_Db_Table_Rowset)[6]
protected '_data' =>
array
0 =>
array
'id' => string '1' (length=1)
'email' => string 'ralph.schindler@zend.com' (length=24)
'comment' => string 'Hello! Hope you enjoy this sample zf application!' (length=49)
'created' => string '2011-10-14 09:09:56' (length=19)
protected '_table' =>
object(Guestbook)[3]
protected '_definition' => null
protected '_definitionConfigName' => null
protected '_db' =>
object(Zend_Db_Adapter_Pdo_Mysql)[1]
protected '_pdoType' => string 'mysql' (length=5)
protected '_numericDataTypes' =>
array
...
protected '_defaultStmtClass' => string 'Zend_Db_Statement_Pdo' (length=21)
protected '_config' =>
array
...
protected '_fetchMode' => int 2
protected '_profiler' =>
object(Zend_Db_Profiler)[2]
...
protected '_defaultProfilerClass' => string 'Zend_Db_Profiler' (length=16)
protected '_connection' =>
object(PDO)[4]
...
protected '_caseFolding' => int 0
protected '_autoQuoteIdentifiers' => boolean true
protected '_allowSerialization' => boolean true
protected '_autoReconnectOnUnserialize' => boolean false
protected '_schema' => null
protected '_name' => string 'Guestbook' (length=9)
protected '_cols' =>
array
0 => string 'id' (length=2)
1 => string 'email' (length=5)
2 => string 'comment' (length=7)
3 => string 'created' (length=7)
protected '_primary' =>
array
1 => string 'id' (length=2)
protected '_identity' => int 1
protected '_sequence' => boolean true
protected '_metadata' =>
array
'id' =>
array
...
'email' =>
array
...
'comment' =>
array
...
'created' =>
array
...
protected '_metadataCache' => null
protected '_metadataCacheInClass' => boolean true
protected '_rowClass' => string 'Zend_Db_Table_Row' (length=17)
protected '_rowsetClass' => string 'Zend_Db_Table_Rowset' (length=20)
protected '_referenceMap' =>
array
empty
protected '_dependentTables' =>
array
empty
protected '_defaultSource' => string 'defaultNone' (length=11)
protected '_defaultValues' =>
array
empty
protected '_connected' => boolean true
protected '_tableClass' => string 'Guestbook' (length=9)
protected '_rowClass' => string 'Zend_Db_Table_Row' (length=17)
protected '_pointer' => int 0
protected '_count' => int 1
protected '_rows' =>
array
empty
protected '_stored' => boolean true
protected '_readOnly' => boolean false
object(Zend_Db_Table_Rowset)[7]
protected '_data' =>
array
0 =>
array
'id' => string '1' (length=1)
'email' => string 'ralph.schindler@zend.com' (length=24)
'comment' => string 'Hello! Hope you enjoy this sample zf application!' (length=49)
'created' => string '2011-10-14 09:09:56' (length=19)
1 =>
array
'id' => string '2' (length=1)
'email' => string 'foo@bar.com' (length=11)
'comment' => string 'Baz baz baz, baz baz Baz baz baz - baz baz baz.' (length=47)
'created' => string '2011-10-14 09:09:56' (length=19)
protected '_table' =>
object(Guestbook)[3]
protected '_definition' => null
protected '_definitionConfigName' => null
protected '_db' =>
object(Zend_Db_Adapter_Pdo_Mysql)[1]
protected '_pdoType' => string 'mysql' (length=5)
protected '_numericDataTypes' =>
array
...
protected '_defaultStmtClass' => string 'Zend_Db_Statement_Pdo' (length=21)
protected '_config' =>
array
...
protected '_fetchMode' => int 2
protected '_profiler' =>
object(Zend_Db_Profiler)[2]
...
protected '_defaultProfilerClass' => string 'Zend_Db_Profiler' (length=16)
protected '_connection' =>
object(PDO)[4]
...
protected '_caseFolding' => int 0
protected '_autoQuoteIdentifiers' => boolean true
protected '_allowSerialization' => boolean true
protected '_autoReconnectOnUnserialize' => boolean false
protected '_schema' => null
protected '_name' => string 'Guestbook' (length=9)
protected '_cols' =>
array
0 => string 'id' (length=2)
1 => string 'email' (length=5)
2 => string 'comment' (length=7)
3 => string 'created' (length=7)
protected '_primary' =>
array
1 => string 'id' (length=2)
protected '_identity' => int 1
protected '_sequence' => boolean true
protected '_metadata' =>
array
'id' =>
array
...
'email' =>
array
...
'comment' =>
array
...
'created' =>
array
...
protected '_metadataCache' => null
protected '_metadataCacheInClass' => boolean true
protected '_rowClass' => string 'Zend_Db_Table_Row' (length=17)
protected '_rowsetClass' => string 'Zend_Db_Table_Rowset' (length=20)
protected '_referenceMap' =>
array
empty
protected '_dependentTables' =>
array
empty
protected '_defaultSource' => string 'defaultNone' (length=11)
protected '_defaultValues' =>
array
empty
protected '_connected' => boolean true
protected '_tableClass' => string 'Guestbook' (length=9)
protected '_rowClass' => string 'Zend_Db_Table_Row' (length=17)
protected '_pointer' => int 0
protected '_count' => int 2
protected '_rows' =>
array
empty
protected '_stored' => boolean true
protected '_readOnly' => boolean false
