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php调用方法mssql_fetch_row、mssql_fetch_array、mssql_fetch_assoc和m

Jun 13, 2016 am 11:59 AM
arrayfetchmssqlphpthe differenceanddatamethodofreadtransfer

方法名:mssql_fetch_row()

测试:

复制代码 代码如下:


require 'dbconn.php';
$sql = 'select * from _Test';
$query = mssql_query($sql);
while($row=mssql_fetch_row($query))
{
echo $row['UserId'].'::'.$row[1].'
';
}


返回:

Notice: Undefined index: UserId in D:/_PHP_Test/Test2/test_connLocalDB.php on line 32 ::王小一
Notice: Undefined index: UserId in D:/_PHP_Test/Test2/test_connLocalDB.php on line 32 ::王小二
Notice: Undefined index: UserId in D:/_PHP_Test/Test2/test_connLocalDB.php on line 32 ::王小三
Notice: Undefined index: UserId in D:/_PHP_Test/Test2/test_connLocalDB.php on line 32 ::王小四
Notice: Undefined index: UserId in D:/_PHP_Test/Test2/test_connLocalDB.php on line 32 ::王小五

分析:

mssql_fetch_row(),和用mssql_fetch_array()加上第二个可选参数 MYSQL_NUM 完全相同。从和指定的结果标识关联的结果集中取得一行数据并作为数组返回。每个结果的列储存在一个数组的单元中,偏移量从 0 开始。 注意,这里是从0开始偏移,不能用key值(字段名)来取值,只能用索引来取值。因此,这里使用$row['key值']无法取到值。

方法名: mssql_fetch_assoc()

测试:

复制代码 代码如下:


$query = mssql_query($sql);
while($row=mssql_fetch_assoc($query))
{
echo $row['UserId'].'::'.$row[1].'
';
}


返回:

Notice: Undefined offset: 1 in D:/_PHP_Test/Test2/test_connLocalDB.php on line 43 1::
Notice: Undefined offset: 1 in D:/_PHP_Test/Test2/test_connLocalDB.php on line 43 2::
Notice: Undefined offset: 1 in D:/_PHP_Test/Test2/test_connLocalDB.php on line 43 3::
Notice: Undefined offset: 1 in D:/_PHP_Test/Test2/test_connLocalDB.php on line 43 4::
Notice: Undefined offset: 1 in D:/_PHP_Test/Test2/test_connLocalDB.php on line 43 5::
分析:
mssql_fetch_assoc() 和用mssql_fetch_array()加上第二个可选参数 MYSQL_ASSOC 完全相同。它仅仅返回关联数组。这也是 mssql_fetch_array()起初始的工作方式。因此用$row[索引值]无法取到值。

方法名: mssql_fetch_array()

测试:

复制代码 代码如下:


$query = mssql_query($sql);
while($row=mssql_fetch_array($query))
{
echo $row['UserId'].'::'.$row[1].'
';
}
?>



返回:
1::王小一
2::王小二
3::王小三
4::王小四
5::王小五

分析:
mssql_fetch_array(),是mssql_fetch_row()的扩展版本。除了将数据以数字索引方式储存在数组中之外,还可以将数据作为关联索引储存,用字段名作为键名。 因此这里使用$row['key值']和$row[索引值]皆可以取到值。

mssql_fetch_array() 中第二个参数result_type (这是一个常量)为可选参数,取值范围为:MYSQL_ASSOC ,MYSQL_NUM 和 MYSQL_BOTH 。其中:
mssql_fetch_array($query, MYSQL_ASSOC) == mssql_fetch_assoc($query);
mssql_fetch_array($query, MYSQL_NUM) == mssql_fetch_row($query);
所以mssql_fetch_array()函数在某种程度上可以算是mssql_fetch_row()与 mssql_fetch_assoc ()的集合。因此,mssql_fetch_array()另外还有MYSQL_BOTH参数,将得到一个同时包含关 联和数字索引的数组。

方法名: mssql_fetch_object()

测试:

复制代码 代码如下:


$query=mssql_query($sql);
while($row=mssql_fetch_object($query))
{
echo $row->UserId.'::'.$row->CreateTime."
";
}


返回:
1::06 7 2011 4:46PM
2::06 7 2011 4:46PM
3::06 7 2011 4:46PM
4::06 7 2011 4:46PM
5::06 7 2011 4:46PM

分析:

mysql_fetch_object() 和 mssql_fetch_array类似,只有一点区别,即返回一个对象而不是数组,并将字段名字做为属性。间接地也意味着只能通过字段名来访问,而不是偏移量。
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